diff --git a/src/tui.zig b/src/tui.zig
index 75c22ff..961d921 100644
--- a/src/tui.zig
+++ b/src/tui.zig
@@ -93,6 +93,7 @@ pub const InputMode = enum {
     normal,
     symbol_input,
     help,
+    account_picker,
 };
 
 pub const StyledLine = struct {
@@ -296,6 +297,11 @@ pub const App = struct {
     watchlist_prices: ?std.StringHashMap(f64) = null, // cached watchlist prices (no disk I/O during render)
     prefetched_prices: ?std.StringHashMap(f64) = null, // prices loaded before TUI starts (with stderr progress)
 
+    // Account filter state
+    account_filter: ?[]const u8 = null, // active account filter (owned copy; null = all accounts)
+    account_list: std.ArrayList([]const u8) = .empty, // distinct accounts from portfolio lots (borrowed from portfolio)
+    account_picker_cursor: usize = 0, // cursor position in picker (0 = "All accounts")
+
     // Options navigation (inline expand/collapse like portfolio)
     options_cursor: usize = 0, // selected row in flattened options view
     options_expanded: [64]bool = [_]bool{false} ** 64, // which expirations are expanded
@@ -368,6 +374,9 @@ pub const App = struct {
                 if (self.mode == .symbol_input) {
                     return self.handleInputKey(ctx, key);
                 }
+                if (self.mode == .account_picker) {
+                    return self.handleAccountPickerKey(ctx, key);
+                }
                 if (self.mode == .help) {
                     self.mode = .normal;
                     return ctx.consumeAndRedraw();
@@ -385,6 +394,42 @@ pub const App = struct {
     }
 
     fn handleMouse(self: *App, ctx: *vaxis.vxfw.EventContext, mouse: vaxis.Mouse) void {
+        // Account picker mouse handling
+        if (self.mode == .account_picker) {
+            const total_items = self.account_list.items.len + 1;
+            switch (mouse.button) {
+                .wheel_up => {
+                    if (self.shouldDebounceWheel()) return;
+                    if (self.account_picker_cursor > 0)
+                        self.account_picker_cursor -= 1;
+                    return ctx.consumeAndRedraw();
+                },
+                .wheel_down => {
+                    if (self.shouldDebounceWheel()) return;
+                    if (total_items > 0 and self.account_picker_cursor < total_items - 1)
+                        self.account_picker_cursor += 1;
+                    return ctx.consumeAndRedraw();
+                },
+                .left => {
+                    if (mouse.type != .press) return;
+                    // Map click row to picker item index.
+                    // mouse.row maps directly to content line index
+                    // (same convention as portfolio click handling).
+                    const content_row = @as(usize, @intCast(mouse.row));
+                    if (content_row >= portfolio_tab.account_picker_header_lines) {
+                        const item_idx = content_row - portfolio_tab.account_picker_header_lines;
+                        if (item_idx < total_items) {
+                            self.account_picker_cursor = item_idx;
+                            self.applyAccountPickerSelection();
+                            return ctx.consumeAndRedraw();
+                        }
+                    }
+                },
+                else => {},
+            }
+            return;
+        }
+
         switch (mouse.button) {
             .wheel_up => {
                 self.moveBy(-3);
@@ -560,9 +605,95 @@ pub const App = struct {
         }
     }
 
-    fn handleNormalKey(self: *App, ctx: *vaxis.vxfw.EventContext, key: vaxis.Key) void {
-        // Escape: no special behavior needed (options is now inline)
+    /// Handles keypresses in account_picker mode.
+    fn handleAccountPickerKey(self: *App, ctx: *vaxis.vxfw.EventContext, key: vaxis.Key) void {
+        const total_items = self.account_list.items.len + 1; // +1 for "All accounts"
+
+        // Cancel: return to normal mode without changing the filter
         if (key.codepoint == vaxis.Key.escape) {
+            self.mode = .normal;
+            return ctx.consumeAndRedraw();
+        }
+
+        // Confirm: apply the selected account filter
+        if (key.codepoint == vaxis.Key.enter) {
+            self.applyAccountPickerSelection();
+            return ctx.consumeAndRedraw();
+        }
+
+        // Use the keymap for navigation actions
+        const action = self.keymap.matchAction(key) orelse return;
+        switch (action) {
+            .select_next => {
+                if (total_items > 0 and self.account_picker_cursor < total_items - 1)
+                    self.account_picker_cursor += 1;
+                return ctx.consumeAndRedraw();
+            },
+            .select_prev => {
+                if (self.account_picker_cursor > 0)
+                    self.account_picker_cursor -= 1;
+                return ctx.consumeAndRedraw();
+            },
+            .scroll_top => {
+                self.account_picker_cursor = 0;
+                return ctx.consumeAndRedraw();
+            },
+            .scroll_bottom => {
+                if (total_items > 0)
+                    self.account_picker_cursor = total_items - 1;
+                return ctx.consumeAndRedraw();
+            },
+            else => {},
+        }
+    }
+
+    /// Apply the current account picker selection and return to normal mode.
+    fn applyAccountPickerSelection(self: *App) void {
+        if (self.account_picker_cursor == 0) {
+            // "All accounts" — clear filter
+            self.setAccountFilter(null);
+        } else {
+            const idx = self.account_picker_cursor - 1;
+            if (idx < self.account_list.items.len) {
+                self.setAccountFilter(self.account_list.items[idx]);
+            }
+        }
+        self.mode = .normal;
+        self.cursor = 0;
+        self.scroll_offset = 0;
+        portfolio_tab.rebuildPortfolioRows(self);
+
+        if (self.account_filter) |af| {
+            var tmp_buf: [256]u8 = undefined;
+            const msg = std.fmt.bufPrint(&tmp_buf, "Filtered: {s}", .{af}) catch "Filtered";
+            self.setStatus(msg);
+        } else {
+            self.setStatus("Filter cleared: showing all accounts");
+        }
+    }
+
+    /// Set or clear the account filter. Owns the string via allocator.
+    pub fn setAccountFilter(self: *App, name: ?[]const u8) void {
+        // Free the old owned copy
+        if (self.account_filter) |old| self.allocator.free(old);
+        if (name) |n| {
+            self.account_filter = self.allocator.dupe(u8, n) catch null;
+        } else {
+            self.account_filter = null;
+        }
+    }
+
+    fn handleNormalKey(self: *App, ctx: *vaxis.vxfw.EventContext, key: vaxis.Key) void {
+        // Escape: clear account filter on portfolio tab, no-op otherwise
+        if (key.codepoint == vaxis.Key.escape) {
+            if (self.active_tab == .portfolio and self.account_filter != null) {
+                self.setAccountFilter(null);
+                self.cursor = 0;
+                self.scroll_offset = 0;
+                portfolio_tab.rebuildPortfolioRows(self);
+                self.setStatus("Filter cleared: showing all accounts");
+                return ctx.consumeAndRedraw();
+            }
             return;
         }
 
@@ -754,18 +885,40 @@ pub const App = struct {
                     return ctx.consumeAndRedraw();
                 }
             },
+            .account_filter => {
+                if (self.active_tab == .portfolio and self.portfolio != null) {
+                    self.mode = .account_picker;
+                    // Position cursor on the currently-active filter (or 0 for "All")
+                    self.account_picker_cursor = 0;
+                    if (self.account_filter) |af| {
+                        for (self.account_list.items, 0..) |acct, ai| {
+                            if (std.mem.eql(u8, acct, af)) {
+                                self.account_picker_cursor = ai + 1; // +1 because 0 = "All accounts"
+                                break;
+                            }
+                        }
+                    }
+                    return ctx.consumeAndRedraw();
+                }
+            },
         }
     }
 
+    /// Returns true if this wheel event should be suppressed (too close to the last one).
+    fn shouldDebounceWheel(self: *App) bool {
+        const now = std.time.nanoTimestamp();
+        if (now - self.last_wheel_ns < 1 * std.time.ns_per_ms) return true;
+        self.last_wheel_ns = now;
+        return false;
+    }
+
     /// Move cursor/scroll. Positive = down, negative = up.
     /// For portfolio and options tabs, moves the row cursor by 1 with
     /// debounce to absorb duplicate events from mouse wheel ticks.
     /// For other tabs, adjusts scroll_offset by |n|.
     fn moveBy(self: *App, n: isize) void {
         if (self.active_tab == .portfolio or self.active_tab == .options) {
-            const now = std.time.nanoTimestamp();
-            if (now - self.last_wheel_ns < 1 * std.time.ns_per_ms) return;
-            self.last_wheel_ns = now;
+            if (self.shouldDebounceWheel()) return;
             if (self.active_tab == .portfolio) {
                 stepCursor(&self.cursor, self.portfolio_rows.items.len, n);
                 self.ensureCursorVisible();
@@ -1174,6 +1327,8 @@ pub const App = struct {
         self.freePortfolioSummary();
         self.portfolio_rows.deinit(self.allocator);
         self.options_rows.deinit(self.allocator);
+        self.account_list.deinit(self.allocator);
+        if (self.account_filter) |af| self.allocator.free(af);
         if (self.watchlist_prices) |*wp| wp.deinit();
         if (self.analysis_result) |*ar| ar.deinit(self.allocator);
         if (self.classification_map) |*cm| cm.deinit();
@@ -1275,6 +1430,8 @@ pub const App = struct {
 
         if (self.mode == .help) {
             try self.drawStyledContent(ctx.arena, buf, width, height, try self.buildHelpStyledLines(ctx.arena));
+        } else if (self.mode == .account_picker) {
+            try portfolio_tab.drawAccountPicker(self, ctx.arena, buf, width, height);
         } else {
             switch (self.active_tab) {
                 .portfolio => try self.drawPortfolioContent(ctx.arena, buf, width, height),
@@ -1360,12 +1517,29 @@ pub const App = struct {
                     buf[hint_start + i] = .{ .char = .{ .grapheme = glyph(hint[i]) }, .style = hint_style };
                 }
             }
+        } else if (self.mode == .account_picker) {
+            const prompt_style = t.inputStyle();
+            @memset(buf, .{ .char = .{ .grapheme = " " }, .style = prompt_style });
+            const hint = " j/k=navigate  Enter=select  Esc=cancel  Click=select ";
+            for (0..@min(hint.len, width)) |i| {
+                buf[i] = .{ .char = .{ .grapheme = glyph(hint[i]) }, .style = prompt_style };
+            }
         } else {
             const status_style = t.statusStyle();
             @memset(buf, .{ .char = .{ .grapheme = " " }, .style = status_style });
-            const msg = self.getStatus();
-            for (0..@min(msg.len, width)) |i| {
-                buf[i] = .{ .char = .{ .grapheme = glyph(msg[i]) }, .style = status_style };
+            // Show account filter indicator when active, appended to status message
+            if (self.account_filter != null and self.active_tab == .portfolio) {
+                const af = self.account_filter.?;
+                const msg = self.getStatus();
+                const filter_text = std.fmt.allocPrint(ctx.arena, "{s}  [Account: {s}]", .{ msg, af }) catch msg;
+                for (0..@min(filter_text.len, width)) |i| {
+                    buf[i] = .{ .char = .{ .grapheme = glyph(filter_text[i]) }, .style = status_style };
+                }
+            } else {
+                const msg = self.getStatus();
+                for (0..@min(msg.len, width)) |i| {
+                    buf[i] = .{ .char = .{ .grapheme = glyph(msg[i]) }, .style = status_style };
+                }
             }
         }
 
@@ -1435,7 +1609,7 @@ pub const App = struct {
             "Toggle all puts (options)", "Filter +/- 1 NTM",  "Filter +/- 2 NTM",           "Filter +/- 3 NTM",
             "Filter +/- 4 NTM",          "Filter +/- 5 NTM",  "Filter +/- 6 NTM",           "Filter +/- 7 NTM",
             "Filter +/- 8 NTM",          "Filter +/- 9 NTM",  "Chart: next timeframe",      "Chart: prev timeframe",
-            "Sort: next column",         "Sort: prev column", "Sort: reverse order",
+            "Sort: next column",         "Sort: prev column", "Sort: reverse order",        "Account filter (portfolio)",
         };
 
         for (actions, 0..) |action, ai| {
diff --git a/src/tui/keybinds.zig b/src/tui/keybinds.zig
index 915c631..d6916a6 100644
--- a/src/tui/keybinds.zig
+++ b/src/tui/keybinds.zig
@@ -42,6 +42,7 @@ pub const Action = enum {
     sort_col_next,
     sort_col_prev,
     sort_reverse,
+    account_filter,
 };
 
 pub const KeyCombo = struct {
@@ -124,6 +125,7 @@ const default_bindings = [_]Binding{
     .{ .action = .sort_col_next, .key = .{ .codepoint = '>' } },
     .{ .action = .sort_col_prev, .key = .{ .codepoint = '<' } },
     .{ .action = .sort_reverse, .key = .{ .codepoint = 'o' } },
+    .{ .action = .account_filter, .key = .{ .codepoint = 'a' } },
 };
 
 pub fn defaults() KeyMap {
diff --git a/src/tui/portfolio_tab.zig b/src/tui/portfolio_tab.zig
index 530003a..9d9db77 100644
--- a/src/tui/portfolio_tab.zig
+++ b/src/tui/portfolio_tab.zig
@@ -187,6 +187,7 @@ pub fn loadPortfolioData(app: *App) void {
     }
 
     sortPortfolioAllocations(app);
+    buildAccountList(app);
     rebuildPortfolioRows(app);
 
     const summary = pf_data.summary;
@@ -270,11 +271,16 @@ pub fn rebuildPortfolioRows(app: *App) void {
 
     if (app.portfolio_summary) |s| {
         for (s.allocations, 0..) |a, i| {
-            // Count lots for this symbol
+            // Skip allocations that don't match account filter
+            if (!allocationMatchesFilter(app, a)) continue;
+
+            // Count lots for this symbol (filtered by account when filter is active)
             var lcount: usize = 0;
             if (app.portfolio) |pf| {
                 for (pf.lots) |lot| {
-                    if (lot.security_type == .stock and std.mem.eql(u8, lot.priceSymbol(), a.symbol)) lcount += 1;
+                    if (lot.security_type == .stock and std.mem.eql(u8, lot.priceSymbol(), a.symbol)) {
+                        if (matchesAccountFilter(app, lot.account)) lcount += 1;
+                    }
                 }
             }
 
@@ -293,7 +299,8 @@ pub fn rebuildPortfolioRows(app: *App) void {
                     defer matching.deinit(app.allocator);
                     for (pf.lots) |lot| {
                         if (lot.security_type == .stock and std.mem.eql(u8, lot.priceSymbol(), a.symbol)) {
-                            matching.append(app.allocator, lot) catch continue;
+                            if (matchesAccountFilter(app, lot.account))
+                                matching.append(app.allocator, lot) catch continue;
                         }
                     }
                     std.mem.sort(zfin.Lot, matching.items, {}, fmt.lotSortFn);
@@ -367,125 +374,68 @@ pub fn rebuildPortfolioRows(app: *App) void {
 
     // Add watchlist items from both the separate watchlist file and
     // watch lots embedded in the portfolio. Skip symbols already in allocations.
-    var watch_seen = std.StringHashMap(void).init(app.allocator);
-    defer watch_seen.deinit();
+    // Hide watchlist entirely when account filter is active (watchlist items don't belong to accounts).
+    if (app.account_filter == null) {
+        var watch_seen = std.StringHashMap(void).init(app.allocator);
+        defer watch_seen.deinit();
 
-    // Mark all portfolio position symbols as seen
-    if (app.portfolio_summary) |s| {
-        for (s.allocations) |a| {
-            watch_seen.put(a.symbol, {}) catch {};
-        }
-    }
-
-    // Watch lots from portfolio file
-    if (app.portfolio) |pf| {
-        for (pf.lots) |lot| {
-            if (lot.security_type == .watch) {
-                if (watch_seen.contains(lot.priceSymbol())) continue;
-                watch_seen.put(lot.priceSymbol(), {}) catch {};
-                app.portfolio_rows.append(app.allocator, .{
-                    .kind = .watchlist,
-                    .symbol = lot.symbol,
-                }) catch continue;
+        // Mark all portfolio position symbols as seen
+        if (app.portfolio_summary) |s| {
+            for (s.allocations) |a| {
+                watch_seen.put(a.symbol, {}) catch {};
             }
         }
-    }
 
-    // Separate watchlist file (backward compat)
-    if (app.watchlist) |wl| {
-        for (wl) |sym| {
-            if (watch_seen.contains(sym)) continue;
-            watch_seen.put(sym, {}) catch {};
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .watchlist,
-                .symbol = sym,
-            }) catch continue;
-        }
-    }
-
-    // Options section
-    if (app.portfolio) |pf| {
-        if (pf.hasType(.option)) {
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .section_header,
-                .symbol = "Options",
-            }) catch {};
+        // Watch lots from portfolio file
+        if (app.portfolio) |pf| {
             for (pf.lots) |lot| {
-                if (lot.security_type == .option) {
+                if (lot.security_type == .watch) {
+                    if (watch_seen.contains(lot.priceSymbol())) continue;
+                    watch_seen.put(lot.priceSymbol(), {}) catch {};
                     app.portfolio_rows.append(app.allocator, .{
-                        .kind = .option_row,
+                        .kind = .watchlist,
                         .symbol = lot.symbol,
-                        .lot = lot,
                     }) catch continue;
                 }
             }
         }
 
-        // CDs section (sorted by maturity date, earliest first)
-        if (pf.hasType(.cd)) {
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .section_header,
-                .symbol = "Certificates of Deposit",
-            }) catch {};
-            var cd_lots: std.ArrayList(zfin.Lot) = .empty;
-            defer cd_lots.deinit(app.allocator);
-            for (pf.lots) |lot| {
-                if (lot.security_type == .cd) {
-                    cd_lots.append(app.allocator, lot) catch continue;
-                }
-            }
-            std.mem.sort(zfin.Lot, cd_lots.items, {}, fmt.lotMaturitySortFn);
-            for (cd_lots.items) |lot| {
+        // Separate watchlist file (backward compat)
+        if (app.watchlist) |wl| {
+            for (wl) |sym| {
+                if (watch_seen.contains(sym)) continue;
+                watch_seen.put(sym, {}) catch {};
                 app.portfolio_rows.append(app.allocator, .{
-                    .kind = .cd_row,
-                    .symbol = lot.symbol,
-                    .lot = lot,
+                    .kind = .watchlist,
+                    .symbol = sym,
                 }) catch continue;
             }
         }
+    }
 
-        // Cash section (single total row, expandable to show per-account)
-        if (pf.hasType(.cash)) {
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .section_header,
-                .symbol = "Cash",
-            }) catch {};
-            // Total cash row
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .cash_total,
-                .symbol = "CASH",
-            }) catch {};
-            // Per-account cash rows (expanded when cash_total is toggled)
-            if (app.cash_expanded) {
+    // Options section (filtered by account when filter is active)
+    if (app.portfolio) |pf| {
+        if (pf.hasType(.option)) {
+            var has_matching = false;
+            if (app.account_filter != null) {
                 for (pf.lots) |lot| {
-                    if (lot.security_type == .cash) {
-                        app.portfolio_rows.append(app.allocator, .{
-                            .kind = .cash_row,
-                            .symbol = lot.account orelse "Unknown",
-                            .lot = lot,
-                        }) catch continue;
+                    if (lot.security_type == .option and matchesAccountFilter(app, lot.account)) {
+                        has_matching = true;
+                        break;
                     }
                 }
+            } else {
+                has_matching = true;
             }
-        }
-
-        // Illiquid assets section (similar to cash: total row, expandable)
-        if (pf.hasType(.illiquid)) {
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .section_header,
-                .symbol = "Illiquid Assets",
-            }) catch {};
-            // Total illiquid row
-            app.portfolio_rows.append(app.allocator, .{
-                .kind = .illiquid_total,
-                .symbol = "ILLIQUID",
-            }) catch {};
-            // Per-asset rows (expanded when illiquid_total is toggled)
-            if (app.illiquid_expanded) {
+            if (has_matching) {
+                app.portfolio_rows.append(app.allocator, .{
+                    .kind = .section_header,
+                    .symbol = "Options",
+                }) catch {};
                 for (pf.lots) |lot| {
-                    if (lot.security_type == .illiquid) {
+                    if (lot.security_type == .option and matchesAccountFilter(app, lot.account)) {
                         app.portfolio_rows.append(app.allocator, .{
-                            .kind = .illiquid_row,
+                            .kind = .option_row,
                             .symbol = lot.symbol,
                             .lot = lot,
                         }) catch continue;
@@ -493,9 +443,270 @@ pub fn rebuildPortfolioRows(app: *App) void {
                 }
             }
         }
+
+        // CDs section (sorted by maturity date, earliest first; filtered by account)
+        if (pf.hasType(.cd)) {
+            var cd_lots: std.ArrayList(zfin.Lot) = .empty;
+            defer cd_lots.deinit(app.allocator);
+            for (pf.lots) |lot| {
+                if (lot.security_type == .cd and matchesAccountFilter(app, lot.account)) {
+                    cd_lots.append(app.allocator, lot) catch continue;
+                }
+            }
+            if (cd_lots.items.len > 0) {
+                app.portfolio_rows.append(app.allocator, .{
+                    .kind = .section_header,
+                    .symbol = "Certificates of Deposit",
+                }) catch {};
+                std.mem.sort(zfin.Lot, cd_lots.items, {}, fmt.lotMaturitySortFn);
+                for (cd_lots.items) |lot| {
+                    app.portfolio_rows.append(app.allocator, .{
+                        .kind = .cd_row,
+                        .symbol = lot.symbol,
+                        .lot = lot,
+                    }) catch continue;
+                }
+            }
+        }
+
+        // Cash section (filtered by account when filter is active)
+        if (pf.hasType(.cash)) {
+            // When filtered, only show cash lots matching the account
+            if (app.account_filter != null) {
+                var cash_lots: std.ArrayList(zfin.Lot) = .empty;
+                defer cash_lots.deinit(app.allocator);
+                for (pf.lots) |lot| {
+                    if (lot.security_type == .cash and matchesAccountFilter(app, lot.account)) {
+                        cash_lots.append(app.allocator, lot) catch continue;
+                    }
+                }
+                if (cash_lots.items.len > 0) {
+                    app.portfolio_rows.append(app.allocator, .{
+                        .kind = .section_header,
+                        .symbol = "Cash",
+                    }) catch {};
+                    for (cash_lots.items) |lot| {
+                        app.portfolio_rows.append(app.allocator, .{
+                            .kind = .cash_row,
+                            .symbol = lot.account orelse "Unknown",
+                            .lot = lot,
+                        }) catch continue;
+                    }
+                }
+            } else {
+                // Unfiltered: show total + expandable per-account rows
+                app.portfolio_rows.append(app.allocator, .{
+                    .kind = .section_header,
+                    .symbol = "Cash",
+                }) catch {};
+                app.portfolio_rows.append(app.allocator, .{
+                    .kind = .cash_total,
+                    .symbol = "CASH",
+                }) catch {};
+                if (app.cash_expanded) {
+                    for (pf.lots) |lot| {
+                        if (lot.security_type == .cash) {
+                            app.portfolio_rows.append(app.allocator, .{
+                                .kind = .cash_row,
+                                .symbol = lot.account orelse "Unknown",
+                                .lot = lot,
+                            }) catch continue;
+                        }
+                    }
+                }
+            }
+        }
+
+        // Illiquid assets section (hidden when account filter is active)
+        if (app.account_filter == null) {
+            if (pf.hasType(.illiquid)) {
+                app.portfolio_rows.append(app.allocator, .{
+                    .kind = .section_header,
+                    .symbol = "Illiquid Assets",
+                }) catch {};
+                app.portfolio_rows.append(app.allocator, .{
+                    .kind = .illiquid_total,
+                    .symbol = "ILLIQUID",
+                }) catch {};
+                if (app.illiquid_expanded) {
+                    for (pf.lots) |lot| {
+                        if (lot.security_type == .illiquid) {
+                            app.portfolio_rows.append(app.allocator, .{
+                                .kind = .illiquid_row,
+                                .symbol = lot.symbol,
+                                .lot = lot,
+                            }) catch continue;
+                        }
+                    }
+                }
+            }
+        }
     }
 }
 
+/// Build the sorted list of distinct account names from portfolio lots.
+/// Called after portfolio data is loaded or reloaded.
+pub fn buildAccountList(app: *App) void {
+    app.account_list.clearRetainingCapacity();
+
+    const pf = app.portfolio orelse return;
+
+    // Use a set to deduplicate
+    var seen = std.StringHashMap(void).init(app.allocator);
+    defer seen.deinit();
+
+    for (pf.lots) |lot| {
+        if (lot.account) |acct| {
+            if (acct.len > 0 and !seen.contains(acct)) {
+                seen.put(acct, {}) catch continue;
+                app.account_list.append(app.allocator, acct) catch continue;
+            }
+        }
+    }
+
+    // Sort alphabetically
+    std.mem.sort([]const u8, app.account_list.items, {}, struct {
+        fn lessThan(_: void, a: []const u8, b: []const u8) bool {
+            return std.mem.lessThan(u8, a, b);
+        }
+    }.lessThan);
+
+    // If the current filter no longer exists in the new list, clear it
+    if (app.account_filter) |af| {
+        var found = false;
+        for (app.account_list.items) |acct| {
+            if (std.mem.eql(u8, acct, af)) {
+                found = true;
+                break;
+            }
+        }
+        if (!found) app.setAccountFilter(null);
+    }
+}
+
+/// Check if a lot matches the active account filter.
+/// Returns true if no filter is active or the lot's account matches.
+fn matchesAccountFilter(app: *const App, account: ?[]const u8) bool {
+    const filter = app.account_filter orelse return true;
+    const acct = account orelse return false;
+    return std.mem.eql(u8, acct, filter);
+}
+
+/// Check if an allocation matches the active account filter.
+/// Uses the allocation's account field (which is "Multiple" for mixed-account positions).
+/// For "Multiple" accounts, we need to check if any lot with this symbol belongs to the filtered account.
+fn allocationMatchesFilter(app: *const App, a: zfin.valuation.Allocation) bool {
+    const filter = app.account_filter orelse return true;
+    // Simple case: allocation has a single account
+    if (!std.mem.eql(u8, a.account, "Multiple")) {
+        return std.mem.eql(u8, a.account, filter);
+    }
+    // "Multiple" account: check if any stock lot for this symbol belongs to the filtered account
+    if (app.portfolio) |pf| {
+        for (pf.lots) |lot| {
+            if (lot.security_type == .stock and std.mem.eql(u8, lot.priceSymbol(), a.symbol)) {
+                if (lot.account) |la| {
+                    if (std.mem.eql(u8, la, filter)) return true;
+                }
+            }
+        }
+    }
+    return false;
+}
+
+/// Account-filtered view of an allocation. When a position spans multiple accounts,
+/// this holds the values for only the lots matching the active account filter.
+const FilteredAlloc = struct {
+    shares: f64,
+    cost_basis: f64,
+    market_value: f64,
+    unrealized_gain_loss: f64,
+};
+
+/// Compute account-filtered values for an allocation.
+/// For single-account positions (or no filter), returns the allocation's own values.
+/// For "Multiple"-account positions with a filter, sums only the matching lots.
+fn filteredAllocValues(app: *const App, a: zfin.valuation.Allocation) FilteredAlloc {
+    const filter = app.account_filter orelse return .{
+        .shares = a.shares,
+        .cost_basis = a.cost_basis,
+        .market_value = a.market_value,
+        .unrealized_gain_loss = a.unrealized_gain_loss,
+    };
+    if (!std.mem.eql(u8, a.account, "Multiple")) return .{
+        .shares = a.shares,
+        .cost_basis = a.cost_basis,
+        .market_value = a.market_value,
+        .unrealized_gain_loss = a.unrealized_gain_loss,
+    };
+    // Sum values from only the lots matching the filter
+    var shares: f64 = 0;
+    var cost: f64 = 0;
+    if (app.portfolio) |pf| {
+        for (pf.lots) |lot| {
+            if (lot.security_type != .stock) continue;
+            if (!std.mem.eql(u8, lot.priceSymbol(), a.symbol)) continue;
+            if (!lot.isOpen()) continue;
+            const la = lot.account orelse "";
+            if (!std.mem.eql(u8, la, filter)) continue;
+            shares += lot.shares;
+            cost += lot.shares * lot.open_price;
+        }
+    }
+    const mv = shares * a.current_price * a.price_ratio;
+    return .{
+        .shares = shares,
+        .cost_basis = cost,
+        .market_value = mv,
+        .unrealized_gain_loss = mv - cost,
+    };
+}
+
+/// Totals for the filtered account view (stocks + cash + CDs + options).
+const FilteredTotals = struct {
+    value: f64,
+    cost: f64,
+};
+
+/// Compute total value and cost across all asset types for the active account filter.
+/// Returns {0, 0} if no filter is active.
+fn computeFilteredTotals(app: *const App) FilteredTotals {
+    if (app.account_filter == null) return .{ .value = 0, .cost = 0 };
+    var value: f64 = 0;
+    var cost: f64 = 0;
+    if (app.portfolio_summary) |s| {
+        for (s.allocations) |a| {
+            if (allocationMatchesFilter(app, a)) {
+                const fa = filteredAllocValues(app, a);
+                value += fa.market_value;
+                cost += fa.cost_basis;
+            }
+        }
+    }
+    if (app.portfolio) |pf| {
+        for (pf.lots) |lot| {
+            if (!matchesAccountFilter(app, lot.account)) continue;
+            switch (lot.security_type) {
+                .cash => {
+                    value += lot.shares;
+                    cost += lot.shares;
+                },
+                .cd => {
+                    value += lot.shares;
+                    cost += lot.shares;
+                },
+                .option => {
+                    const opt_cost = @abs(lot.shares) * lot.open_price;
+                    value += opt_cost;
+                    cost += opt_cost;
+                },
+                else => {},
+            }
+        }
+    }
+    return .{ .value = value, .cost = cost };
+}
+
 // ── Rendering ─────────────────────────────────────────────────
 
 pub fn drawContent(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, width: u16, height: u16) !void {
@@ -510,57 +721,90 @@ pub fn drawContent(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, width
     try lines.append(arena, .{ .text = "", .style = th.contentStyle() });
 
     if (app.portfolio_summary) |s| {
-        var val_buf: [24]u8 = undefined;
-        var cost_buf: [24]u8 = undefined;
-        var gl_buf: [24]u8 = undefined;
-        const val_str = fmt.fmtMoneyAbs(&val_buf, s.total_value);
-        const cost_str = fmt.fmtMoneyAbs(&cost_buf, s.total_cost);
-        const gl_abs = if (s.unrealized_gain_loss >= 0) s.unrealized_gain_loss else -s.unrealized_gain_loss;
-        const gl_str = fmt.fmtMoneyAbs(&gl_buf, gl_abs);
-        const summary_text = try std.fmt.allocPrint(arena, "  Value: {s}  Cost: {s}  Gain/Loss: {s}{s} ({d:.1}%)", .{
-            val_str, cost_str, if (s.unrealized_gain_loss >= 0) @as([]const u8, "+") else @as([]const u8, "-"), gl_str, s.unrealized_return * 100.0,
-        });
-        const summary_style = if (s.unrealized_gain_loss >= 0) th.positiveStyle() else th.negativeStyle();
-        try lines.append(arena, .{ .text = summary_text, .style = summary_style });
+        if (app.account_filter) |af| {
+            // Filtered mode: compute account-specific totals
+            const ft = computeFilteredTotals(app);
+            const filtered_value = ft.value;
+            const filtered_cost = ft.cost;
+            const filtered_gl = filtered_value - filtered_cost;
+            const filtered_return = if (filtered_cost > 0) (filtered_gl / filtered_cost) else @as(f64, 0);
 
-        // "as of" date indicator
-        if (app.candle_last_date) |d| {
-            var asof_buf: [10]u8 = undefined;
-            const asof_text = try std.fmt.allocPrint(arena, "  (as of close on {s})", .{d.format(&asof_buf)});
-            try lines.append(arena, .{ .text = asof_text, .style = th.mutedStyle() });
-        }
+            // Account name line
+            const acct_text = try std.fmt.allocPrint(arena, "  Account: {s}", .{af});
+            try lines.append(arena, .{ .text = acct_text, .style = th.headerStyle() });
 
-        // Net Worth line (only if portfolio has illiquid assets)
-        if (app.portfolio) |pf| {
-            if (pf.hasType(.illiquid)) {
-                const illiquid_total = pf.totalIlliquid();
-                const net_worth = s.total_value + illiquid_total;
-                var nw_buf: [24]u8 = undefined;
-                var il_buf: [24]u8 = undefined;
-                const nw_text = try std.fmt.allocPrint(arena, "  Net Worth: {s}  (Liquid: {s}  Illiquid: {s})", .{
-                    fmt.fmtMoneyAbs(&nw_buf, net_worth),
-                    val_str,
-                    fmt.fmtMoneyAbs(&il_buf, illiquid_total),
-                });
-                try lines.append(arena, .{ .text = nw_text, .style = th.headerStyle() });
-            }
-        }
-
-        // Historical portfolio value snapshots
-        if (app.historical_snapshots) |snapshots| {
-            try lines.append(arena, .{ .text = "", .style = th.contentStyle() });
-            // Build a single-line summary: "  Historical:  1M: +3.2%  3M: +8.1%  1Y: +22.4%  3Y: +45.1%  5Y: --  10Y: --"
-            var hist_parts: [6][]const u8 = undefined;
-            for (zfin.valuation.HistoricalPeriod.all, 0..) |period, pi| {
-                const snap = snapshots[pi];
-                var hbuf: [16]u8 = undefined;
-                const change_str = fmt.fmtHistoricalChange(&hbuf, snap.position_count, snap.changePct());
-                hist_parts[pi] = try std.fmt.allocPrint(arena, "{s}: {s}", .{ period.label(), change_str });
-            }
-            const hist_text = try std.fmt.allocPrint(arena, "  Historical:  {s}  {s}  {s}  {s}  {s}  {s}", .{
-                hist_parts[0], hist_parts[1], hist_parts[2], hist_parts[3], hist_parts[4], hist_parts[5],
+            var val_buf: [24]u8 = undefined;
+            var cost_buf: [24]u8 = undefined;
+            var gl_buf: [24]u8 = undefined;
+            const val_str = fmt.fmtMoneyAbs(&val_buf, filtered_value);
+            const cost_str = fmt.fmtMoneyAbs(&cost_buf, filtered_cost);
+            const gl_abs = if (filtered_gl >= 0) filtered_gl else -filtered_gl;
+            const gl_str = fmt.fmtMoneyAbs(&gl_buf, gl_abs);
+            const summary_text = try std.fmt.allocPrint(arena, "  Value: {s}  Cost: {s}  Gain/Loss: {s}{s} ({d:.1}%)", .{
+                val_str, cost_str, if (filtered_gl >= 0) @as([]const u8, "+") else @as([]const u8, "-"), gl_str, filtered_return * 100.0,
             });
-            try lines.append(arena, .{ .text = hist_text, .style = th.mutedStyle() });
+            const summary_style = if (filtered_gl >= 0) th.positiveStyle() else th.negativeStyle();
+            try lines.append(arena, .{ .text = summary_text, .style = summary_style });
+
+            if (app.candle_last_date) |d| {
+                var asof_buf: [10]u8 = undefined;
+                const asof_text = try std.fmt.allocPrint(arena, "  (as of close on {s})", .{d.format(&asof_buf)});
+                try lines.append(arena, .{ .text = asof_text, .style = th.mutedStyle() });
+            }
+            // No historical snapshots or net worth when filtered
+        } else {
+            // Unfiltered mode: use portfolio_summary totals directly
+            var val_buf: [24]u8 = undefined;
+            var cost_buf: [24]u8 = undefined;
+            var gl_buf: [24]u8 = undefined;
+            const val_str = fmt.fmtMoneyAbs(&val_buf, s.total_value);
+            const cost_str = fmt.fmtMoneyAbs(&cost_buf, s.total_cost);
+            const gl_abs = if (s.unrealized_gain_loss >= 0) s.unrealized_gain_loss else -s.unrealized_gain_loss;
+            const gl_str = fmt.fmtMoneyAbs(&gl_buf, gl_abs);
+            const summary_text = try std.fmt.allocPrint(arena, "  Value: {s}  Cost: {s}  Gain/Loss: {s}{s} ({d:.1}%)", .{
+                val_str, cost_str, if (s.unrealized_gain_loss >= 0) @as([]const u8, "+") else @as([]const u8, "-"), gl_str, s.unrealized_return * 100.0,
+            });
+            const summary_style = if (s.unrealized_gain_loss >= 0) th.positiveStyle() else th.negativeStyle();
+            try lines.append(arena, .{ .text = summary_text, .style = summary_style });
+
+            // "as of" date indicator
+            if (app.candle_last_date) |d| {
+                var asof_buf: [10]u8 = undefined;
+                const asof_text = try std.fmt.allocPrint(arena, "  (as of close on {s})", .{d.format(&asof_buf)});
+                try lines.append(arena, .{ .text = asof_text, .style = th.mutedStyle() });
+            }
+
+            // Net Worth line (only if portfolio has illiquid assets)
+            if (app.portfolio) |pf| {
+                if (pf.hasType(.illiquid)) {
+                    const illiquid_total = pf.totalIlliquid();
+                    const net_worth = s.total_value + illiquid_total;
+                    var nw_buf: [24]u8 = undefined;
+                    var il_buf: [24]u8 = undefined;
+                    const nw_text = try std.fmt.allocPrint(arena, "  Net Worth: {s}  (Liquid: {s}  Illiquid: {s})", .{
+                        fmt.fmtMoneyAbs(&nw_buf, net_worth),
+                        val_str,
+                        fmt.fmtMoneyAbs(&il_buf, illiquid_total),
+                    });
+                    try lines.append(arena, .{ .text = nw_text, .style = th.headerStyle() });
+                }
+            }
+
+            // Historical portfolio value snapshots
+            if (app.historical_snapshots) |snapshots| {
+                try lines.append(arena, .{ .text = "", .style = th.contentStyle() });
+                var hist_parts: [6][]const u8 = undefined;
+                for (zfin.valuation.HistoricalPeriod.all, 0..) |period, pi| {
+                    const snap = snapshots[pi];
+                    var hbuf: [16]u8 = undefined;
+                    const change_str = fmt.fmtHistoricalChange(&hbuf, snap.position_count, snap.changePct());
+                    hist_parts[pi] = try std.fmt.allocPrint(arena, "{s}: {s}", .{ period.label(), change_str });
+                }
+                const hist_text = try std.fmt.allocPrint(arena, "  Historical:  {s}  {s}  {s}  {s}  {s}  {s}", .{
+                    hist_parts[0], hist_parts[1], hist_parts[2], hist_parts[3], hist_parts[4], hist_parts[5],
+                });
+                try lines.append(arena, .{ .text = hist_text, .style = th.mutedStyle() });
+            }
         }
     } else if (app.portfolio != null) {
         try lines.append(arena, .{ .text = "  No cached prices. Run 'zfin perf <SYMBOL>' for each holding.", .style = th.mutedStyle() });
@@ -602,6 +846,12 @@ pub fn drawContent(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, width
     app.portfolio_header_lines = lines.items.len;
     app.portfolio_line_count = 0;
 
+    // Compute filtered total value for account-relative weight calculation
+    const filtered_total_for_weight: f64 = if (app.account_filter != null)
+        computeFilteredTotals(app).value
+    else
+        0;
+
     // Data rows
     for (app.portfolio_rows.items, 0..) |row, ri| {
         const lines_before = lines.items.len;
@@ -612,23 +862,30 @@ pub fn drawContent(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, width
                 if (app.portfolio_summary) |s| {
                     if (row.pos_idx < s.allocations.len) {
                         const a = s.allocations[row.pos_idx];
+                        // Use account-filtered values for multi-account positions
+                        const fa = filteredAllocValues(app, a);
+                        const display_shares = fa.shares;
+                        const display_avg_cost = if (fa.shares > 0) fa.cost_basis / fa.shares else a.avg_cost;
+                        const display_mv = fa.market_value;
+                        const display_gl = fa.unrealized_gain_loss;
+
                         const is_multi = row.lot_count > 1;
                         const is_expanded = is_multi and row.pos_idx < app.expanded.len and app.expanded[row.pos_idx];
                         const arrow: []const u8 = if (!is_multi) "  " else if (is_expanded) "v " else "> ";
                         const star: []const u8 = if (is_active_sym) "* " else "  ";
-                        const pnl_pct = if (a.cost_basis > 0) (a.unrealized_gain_loss / a.cost_basis) * 100.0 else @as(f64, 0);
+                        const pnl_pct = if (fa.cost_basis > 0) (display_gl / fa.cost_basis) * 100.0 else @as(f64, 0);
                         var gl_val_buf: [24]u8 = undefined;
-                        const gl_abs = if (a.unrealized_gain_loss >= 0) a.unrealized_gain_loss else -a.unrealized_gain_loss;
+                        const gl_abs = if (display_gl >= 0) display_gl else -display_gl;
                         const gl_money = fmt.fmtMoneyAbs(&gl_val_buf, gl_abs);
                         var pnl_buf: [20]u8 = undefined;
-                        const pnl_str = if (a.unrealized_gain_loss >= 0)
+                        const pnl_str = if (display_gl >= 0)
                             std.fmt.bufPrint(&pnl_buf, "+{s}", .{gl_money}) catch "?"
                         else
                             std.fmt.bufPrint(&pnl_buf, "-{s}", .{gl_money}) catch "?";
                         var mv_buf: [24]u8 = undefined;
-                        const mv_str = fmt.fmtMoneyAbs(&mv_buf, a.market_value);
+                        const mv_str = fmt.fmtMoneyAbs(&mv_buf, display_mv);
                         var cost_buf2: [24]u8 = undefined;
-                        const cost_str = fmt.fmtMoneyAbs(&cost_buf2, a.avg_cost);
+                        const cost_str = fmt.fmtMoneyAbs(&cost_buf2, display_avg_cost);
                         var price_buf2: [24]u8 = undefined;
                         const price_str = fmt.fmtMoneyAbs(&price_buf2, a.current_price);
 
@@ -674,8 +931,13 @@ pub fn drawContent(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, width
                             }
                         }
 
+                        const display_weight = if (app.account_filter != null and filtered_total_for_weight > 0)
+                            (display_mv / filtered_total_for_weight)
+                        else
+                            a.weight;
+
                         const text = try std.fmt.allocPrint(arena, "{s}{s}" ++ fmt.sym_col_spec ++ " {d:>8.1} {s:>10} {s:>10} {s:>16} {s:>14} {d:>7.1}% {s:>13} {s}", .{
-                            arrow, star, a.display_symbol, a.shares, cost_str, price_str, mv_str, pnl_str, a.weight * 100.0, date_col, acct_col,
+                            arrow, star, a.display_symbol, display_shares, cost_str, price_str, mv_str, pnl_str, display_weight * 100.0, date_col, acct_col,
                         });
 
                         // base: neutral text for main cols, green/red only for gain/loss col
@@ -925,6 +1187,11 @@ fn drawWelcomeScreen(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, wid
 /// Reload portfolio file from disk without re-fetching prices.
 /// Uses cached candle data to recompute summary.
 pub fn reloadPortfolioFile(app: *App) void {
+    // Save the account filter name before freeing the old portfolio.
+    // account_filter is an owned copy so it survives the portfolio free,
+    // but account_list entries borrow from the portfolio and will dangle.
+    app.account_list.clearRetainingCapacity();
+
     // Re-read the portfolio file
     if (app.portfolio) |*pf| pf.deinit();
     app.portfolio = null;
@@ -1019,6 +1286,7 @@ pub fn reloadPortfolioFile(app: *App) void {
     }
 
     sortPortfolioAllocations(app);
+    buildAccountList(app);
     rebuildPortfolioRows(app);
 
     // Invalidate analysis data -- it holds pointers into old portfolio memory
@@ -1041,3 +1309,42 @@ pub fn reloadPortfolioFile(app: *App) void {
         app.setStatus("Portfolio reloaded from disk");
     }
 }
+
+// ── Account picker ────────────────────────────────────────────
+
+/// Number of header lines in the account picker before the list items start.
+/// Used for mouse click hit-testing.
+pub const account_picker_header_lines: usize = 3;
+
+/// Draw the account picker overlay (replaces portfolio content).
+pub fn drawAccountPicker(app: *App, arena: std.mem.Allocator, buf: []vaxis.Cell, width: u16, height: u16) !void {
+    const th = app.theme;
+    var lines: std.ArrayList(tui.StyledLine) = .empty;
+
+    try lines.append(arena, .{ .text = "", .style = th.contentStyle() });
+    try lines.append(arena, .{ .text = "  Filter by Account", .style = th.headerStyle() });
+    try lines.append(arena, .{ .text = "", .style = th.contentStyle() });
+
+    // Item 0 = "All accounts" (clears filter)
+    const total_items = app.account_list.items.len + 1;
+    for (0..total_items) |i| {
+        const is_selected = i == app.account_picker_cursor;
+        const marker: []const u8 = if (is_selected) "  > " else "    ";
+        const label: []const u8 = if (i == 0) "All accounts" else app.account_list.items[i - 1];
+        const text = try std.fmt.allocPrint(arena, "{s}{s}", .{ marker, label });
+        const style = if (is_selected) th.selectStyle() else th.contentStyle();
+        try lines.append(arena, .{ .text = text, .style = style });
+    }
+
+    try lines.append(arena, .{ .text = "", .style = th.contentStyle() });
+
+    // Scroll so cursor is visible
+    const cursor_line = app.account_picker_cursor + account_picker_header_lines;
+    var start: usize = 0;
+    if (cursor_line >= height) {
+        start = cursor_line - height + 2; // keep one line of padding below
+    }
+    start = @min(start, if (lines.items.len > 0) lines.items.len - 1 else 0);
+
+    try app.drawStyledContent(arena, buf, width, height, lines.items[start..]);
+}