diff --git a/src/analytics/analysis.zig b/src/analytics/analysis.zig
index 9be1849..0101ff2 100644
--- a/src/analytics/analysis.zig
+++ b/src/analytics/analysis.zig
@@ -38,6 +38,8 @@ pub const TaxType = enum {
 pub const AccountTaxEntry = struct {
     account: []const u8,
     tax_type: TaxType,
+    institution: ?[]const u8 = null,
+    account_number: ?[]const u8 = null,
 };
 
 /// Parsed account metadata.
@@ -48,6 +50,8 @@ pub const AccountMap = struct {
     pub fn deinit(self: *AccountMap) void {
         for (self.entries) |e| {
             self.allocator.free(e.account);
+            if (e.institution) |s| self.allocator.free(s);
+            if (e.account_number) |s| self.allocator.free(s);
         }
         self.allocator.free(self.entries);
     }
@@ -61,15 +65,42 @@ pub const AccountMap = struct {
         }
         return "Unknown";
     }
+
+    /// Find the portfolio account name for a given institution + account number.
+    pub fn findByInstitutionAccount(self: AccountMap, institution: []const u8, account_number: []const u8) ?[]const u8 {
+        for (self.entries) |e| {
+            if (e.institution) |inst| {
+                if (e.account_number) |num| {
+                    if (std.mem.eql(u8, inst, institution) and std.mem.eql(u8, num, account_number))
+                        return e.account;
+                }
+            }
+        }
+        return null;
+    }
+
+    /// Return all entries matching a given institution.
+    pub fn entriesForInstitution(self: AccountMap, institution: []const u8) []const AccountTaxEntry {
+        var count: usize = 0;
+        for (self.entries) |e| {
+            if (e.institution) |inst| {
+                if (std.mem.eql(u8, inst, institution)) count += 1;
+            }
+        }
+        if (count == 0) return &.{};
+        return self.entries;
+    }
 };
 
 /// Parse an accounts.srf file into an AccountMap.
-/// Each record has: account::<NAME>,tax_type::<TYPE>
+/// Each record has: account::<NAME>,tax_type::<TYPE>[,institution::<INST>][,account_number::<NUM>]
 pub fn parseAccountsFile(allocator: std.mem.Allocator, data: []const u8) !AccountMap {
     var entries = std.ArrayList(AccountTaxEntry).empty;
     errdefer {
         for (entries.items) |e| {
             allocator.free(e.account);
+            if (e.institution) |s| allocator.free(s);
+            if (e.account_number) |s| allocator.free(s);
         }
         entries.deinit(allocator);
     }
@@ -83,6 +114,8 @@ pub fn parseAccountsFile(allocator: std.mem.Allocator, data: []const u8) !Accoun
         try entries.append(allocator, .{
             .account = try allocator.dupe(u8, entry.account),
             .tax_type = entry.tax_type,
+            .institution = if (entry.institution) |s| try allocator.dupe(u8, s) else null,
+            .account_number = if (entry.account_number) |s| try allocator.dupe(u8, s) else null,
         });
     }
 
diff --git a/src/commands/audit.zig b/src/commands/audit.zig
new file mode 100644
index 0000000..eb47419
--- /dev/null
+++ b/src/commands/audit.zig
@@ -0,0 +1,743 @@
+const std = @import("std");
+const zfin = @import("../root.zig");
+const cli = @import("common.zig");
+const fmt = cli.fmt;
+const analysis = @import("../analytics/analysis.zig");
+
+// ── Brokerage position (normalized from any source) ─────────
+
+/// A single position row from a brokerage export, normalized to a common format.
+pub const BrokeragePosition = struct {
+    account_number: []const u8,
+    account_name: []const u8,
+    symbol: []const u8,
+    description: []const u8,
+    quantity: ?f64,
+    current_value: ?f64,
+    cost_basis: ?f64,
+    is_cash: bool,
+};
+
+/// Parsed brokerage data grouped by account.
+pub const BrokerageAccount = struct {
+    account_number: []const u8,
+    account_name: []const u8,
+    portfolio_account: ?[]const u8,
+    positions: []const BrokeragePosition,
+    total_value: f64,
+    cash_value: f64,
+};
+
+// ── Fidelity CSV parser ─────────────────────────────────────
+//
+// Limitations of this CSV parser:
+//
+// 1. NOT a general-purpose CSV parser. It handles the specific format
+//    exported by Fidelity's "Download Positions" feature.
+//
+// 2. Does NOT handle quoted fields containing commas. Fidelity's export
+//    does not quote fields with commas in practice (description fields
+//    use spaces, not commas), but a truly compliant RFC 4180 parser would
+//    need to handle "field,with,commas" as a single value.
+//
+// 3. Does NOT handle escaped quotes ("" inside quoted fields).
+//
+// 4. Does NOT handle multi-line values (newlines inside quoted fields).
+//
+// 5. Assumes UTF-8 with optional BOM (which Fidelity includes).
+//
+// 6. Stops parsing at the first blank line, which separates position data
+//    from the Fidelity legal disclaimer footer.
+//
+// 7. Hardcodes the expected column layout. If Fidelity changes the CSV
+//    format (adds/removes/reorders columns), this parser will break.
+//    The header row is validated to catch this.
+//
+// 8. Dollar values like "$1,234.56" and "+$1,234.56" are stripped of
+//    $, commas, and leading +/- signs. Negative values wrapped in
+//    parentheses are NOT handled (Fidelity uses -$X.XX format).
+//
+// 9. Money market rows (symbol ending in **) are treated as cash.
+//
+// For a production-grade CSV parser, consider a library that handles
+// RFC 4180 fully (quoted fields, escaping, multi-line values).
+
+const fidelity_expected_columns = 16;
+
+/// Column indices in the Fidelity CSV export.
+/// Based on: Account Number, Account Name, Symbol, Description, Quantity,
+///           Last Price, Last Price Change, Current Value, Today's Gain/Loss Dollar,
+///           Today's Gain/Loss Percent, Total Gain/Loss Dollar, Total Gain/Loss Percent,
+///           Percent Of Account, Cost Basis Total, Average Cost Basis, Type
+const FidelityCol = struct {
+    const account_number = 0;
+    const account_name = 1;
+    const symbol = 2;
+    const description = 3;
+    const quantity = 4;
+    const current_value = 7;
+    const cost_basis_total = 13;
+    const type_col = 15;
+};
+
+/// Parse a Fidelity CSV positions export into BrokeragePosition slices.
+/// All string fields in the returned positions are slices into `data`,
+/// so the caller must keep `data` alive for as long as the positions are used.
+/// Only the returned slice itself is heap-allocated (caller must free it).
+pub fn parseFidelityCsv(allocator: std.mem.Allocator, data: []const u8) ![]BrokeragePosition {
+    var positions = std.ArrayList(BrokeragePosition).empty;
+    errdefer positions.deinit(allocator);
+
+    // Skip UTF-8 BOM if present
+    var content = data;
+    if (content.len >= 3 and content[0] == 0xEF and content[1] == 0xBB and content[2] == 0xBF) {
+        content = content[3..];
+    }
+
+    var lines = std.mem.splitScalar(u8, content, '\n');
+
+    // Validate header row
+    const header_line = lines.next() orelse return error.EmptyFile;
+    const header_trimmed = std.mem.trimRight(u8, header_line, &.{ '\r', ' ' });
+    if (header_trimmed.len == 0) return error.EmptyFile;
+    if (!std.mem.startsWith(u8, header_trimmed, "Account Number")) {
+        return error.UnexpectedHeader;
+    }
+
+    // Parse data rows
+    while (lines.next()) |line| {
+        const trimmed = std.mem.trimRight(u8, line, &.{ '\r', ' ' });
+        if (trimmed.len == 0) break;
+
+        // Skip lines starting with " (disclaimer text)
+        if (trimmed[0] == '"') break;
+
+        var col_iter = std.mem.splitScalar(u8, trimmed, ',');
+        var cols: [fidelity_expected_columns][]const u8 = undefined;
+        var col_count: usize = 0;
+        while (col_iter.next()) |col| {
+            if (col_count < fidelity_expected_columns) {
+                cols[col_count] = col;
+                col_count += 1;
+            }
+        }
+        if (col_count < fidelity_expected_columns) continue;
+
+        const symbol_raw = std.mem.trim(u8, cols[FidelityCol.symbol], &.{ ' ', '"' });
+        if (symbol_raw.len == 0) continue;
+
+        // Money market funds (symbol ending in **) are cash positions.
+        // Note: Fidelity's Type column says "Cash" vs "Margin" to indicate
+        // the account settlement type, NOT that the security is cash.
+        // Only the ** suffix reliably identifies money market / cash holdings.
+        const is_cash = std.mem.endsWith(u8, symbol_raw, "**");
+
+        // Strip ** suffix from money market symbols for display
+        const symbol_clean = if (std.mem.endsWith(u8, symbol_raw, "**"))
+            symbol_raw[0 .. symbol_raw.len - 2]
+        else
+            symbol_raw;
+
+        try positions.append(allocator, .{
+            .account_number = std.mem.trim(u8, cols[FidelityCol.account_number], &.{ ' ', '"' }),
+            .account_name = std.mem.trim(u8, cols[FidelityCol.account_name], &.{ ' ', '"' }),
+            .symbol = symbol_clean,
+            .description = std.mem.trim(u8, cols[FidelityCol.description], &.{ ' ', '"' }),
+            .quantity = if (is_cash) null else parseDollarAmount(cols[FidelityCol.quantity]),
+            .current_value = parseDollarAmount(cols[FidelityCol.current_value]),
+            .cost_basis = if (is_cash) null else parseDollarAmount(cols[FidelityCol.cost_basis_total]),
+            .is_cash = is_cash,
+        });
+    }
+
+    return positions.toOwnedSlice(allocator);
+}
+
+/// Parse a dollar amount string like "$1,234.56", "+$3,732.40", "-$6,300.00".
+/// Strips $, commas, and +/- prefix. Returns null for empty or unparseable values.
+fn parseDollarAmount(raw: []const u8) ?f64 {
+    const trimmed = std.mem.trim(u8, raw, &.{ ' ', '"' });
+    if (trimmed.len == 0) return null;
+
+    // Strip leading +/- and $, remove commas
+    var buf: [64]u8 = undefined;
+    var pos: usize = 0;
+    var negative = false;
+    for (trimmed) |c| {
+        if (c == '-') {
+            negative = true;
+        } else if (c == '$' or c == '+' or c == ',') {
+            continue;
+        } else {
+            if (pos >= buf.len) return null;
+            buf[pos] = c;
+            pos += 1;
+        }
+    }
+    if (pos == 0) return null;
+
+    const val = std.fmt.parseFloat(f64, buf[0..pos]) catch return null;
+    return if (negative) -val else val;
+}
+
+// ── Audit logic ─────────────────────────────────────────────
+
+/// Comparison result for a single symbol within an account.
+pub const SymbolComparison = struct {
+    symbol: []const u8,
+    portfolio_shares: f64,
+    brokerage_shares: ?f64,
+    portfolio_value: f64,
+    brokerage_value: ?f64,
+    shares_delta: ?f64,
+    value_delta: ?f64,
+    is_cash: bool,
+    only_in_brokerage: bool,
+    only_in_portfolio: bool,
+};
+
+/// Comparison result for a single account.
+pub const AccountComparison = struct {
+    account_name: []const u8,
+    brokerage_name: []const u8,
+    account_number: []const u8,
+    comparisons: []const SymbolComparison,
+    portfolio_total: f64,
+    brokerage_total: f64,
+    total_delta: f64,
+    has_discrepancies: bool,
+};
+
+/// Build per-account comparisons between portfolio.srf and brokerage data.
+pub fn compareAccounts(
+    allocator: std.mem.Allocator,
+    portfolio: zfin.Portfolio,
+    brokerage_positions: []const BrokeragePosition,
+    account_map: analysis.AccountMap,
+    institution: []const u8,
+    prices: std.StringHashMap(f64),
+) ![]AccountComparison {
+    var results = std.ArrayList(AccountComparison).empty;
+    errdefer results.deinit(allocator);
+
+    // Group brokerage positions by account number
+    var brokerage_accounts = std.StringHashMap(std.ArrayList(BrokeragePosition)).init(allocator);
+    defer {
+        var it = brokerage_accounts.valueIterator();
+        while (it.next()) |v| v.deinit(allocator);
+        brokerage_accounts.deinit();
+    }
+
+    for (brokerage_positions) |bp| {
+        const entry = try brokerage_accounts.getOrPut(bp.account_number);
+        if (!entry.found_existing) {
+            entry.value_ptr.* = .empty;
+        }
+        try entry.value_ptr.append(allocator, bp);
+    }
+
+    // For each brokerage account, find the matching portfolio account and compare
+    var acct_iter = brokerage_accounts.iterator();
+    while (acct_iter.next()) |kv| {
+        const acct_num = kv.key_ptr.*;
+        const broker_positions = kv.value_ptr.items;
+        if (broker_positions.len == 0) continue;
+
+        const broker_name = broker_positions[0].account_name;
+        const portfolio_acct_name = account_map.findByInstitutionAccount(institution, acct_num);
+
+        var comparisons = std.ArrayList(SymbolComparison).empty;
+        errdefer comparisons.deinit(allocator);
+
+        var portfolio_total: f64 = 0;
+        var brokerage_total: f64 = 0;
+        var has_discrepancies = false;
+
+        // Track which portfolio symbols we've matched
+        var matched_symbols = std.StringHashMap(void).init(allocator);
+        defer matched_symbols.deinit();
+
+        // Compare each brokerage position against portfolio
+        for (broker_positions) |bp| {
+            const bp_value = bp.current_value orelse 0;
+            brokerage_total += bp_value;
+
+            if (portfolio_acct_name == null) {
+                try comparisons.append(allocator, .{
+                    .symbol = bp.symbol,
+                    .portfolio_shares = 0,
+                    .brokerage_shares = bp.quantity,
+                    .portfolio_value = 0,
+                    .brokerage_value = bp.current_value,
+                    .shares_delta = if (bp.quantity) |q| q else null,
+                    .value_delta = bp.current_value,
+                    .is_cash = bp.is_cash,
+                    .only_in_brokerage = true,
+                    .only_in_portfolio = false,
+                });
+                has_discrepancies = true;
+                continue;
+            }
+
+            // Sum portfolio lots for this symbol+account
+            var pf_shares: f64 = 0;
+            var pf_value: f64 = 0;
+
+            if (bp.is_cash) {
+                pf_shares = portfolio.cashForAccount(portfolio_acct_name.?);
+                pf_value = pf_shares;
+            } else {
+                const acct_positions = portfolio.positionsForAccount(allocator, portfolio_acct_name.?) catch &.{};
+                defer allocator.free(acct_positions);
+
+                for (acct_positions) |pos| {
+                    if (!std.mem.eql(u8, pos.symbol, bp.symbol) and
+                        !std.mem.eql(u8, pos.lot_symbol, bp.symbol))
+                        continue;
+                    pf_shares = pos.shares;
+                    const price = prices.get(pos.symbol) orelse pos.avg_cost;
+                    pf_value = pos.shares * price * pos.price_ratio;
+                    try matched_symbols.put(pos.symbol, {});
+                    try matched_symbols.put(pos.lot_symbol, {});
+                }
+            }
+
+            try matched_symbols.put(bp.symbol, {});
+            portfolio_total += pf_value;
+
+            const shares_delta = if (bp.quantity) |bq| bq - pf_shares else null;
+            const value_delta = if (bp.current_value) |bv| bv - pf_value else null;
+
+            const shares_match = if (shares_delta) |d| @abs(d) < 0.01 else true;
+            const value_match = if (value_delta) |d| @abs(d) < 1.0 else true;
+
+            if (!shares_match or !value_match) has_discrepancies = true;
+
+            try comparisons.append(allocator, .{
+                .symbol = bp.symbol,
+                .portfolio_shares = pf_shares,
+                .brokerage_shares = bp.quantity,
+                .portfolio_value = pf_value,
+                .brokerage_value = bp.current_value,
+                .shares_delta = shares_delta,
+                .value_delta = value_delta,
+                .is_cash = bp.is_cash,
+                .only_in_brokerage = pf_shares == 0 and pf_value == 0,
+                .only_in_portfolio = false,
+            });
+        }
+
+        // Find portfolio-only positions (in portfolio but not in brokerage)
+        if (portfolio_acct_name) |pa| {
+            const acct_positions = portfolio.positionsForAccount(allocator, pa) catch &.{};
+            defer allocator.free(acct_positions);
+
+            for (acct_positions) |pos| {
+                if (matched_symbols.contains(pos.symbol)) continue;
+                if (matched_symbols.contains(pos.lot_symbol)) continue;
+
+                try matched_symbols.put(pos.symbol, {});
+
+                const price = prices.get(pos.symbol) orelse pos.avg_cost;
+                const mv = pos.shares * price * pos.price_ratio;
+                portfolio_total += mv;
+
+                has_discrepancies = true;
+                try comparisons.append(allocator, .{
+                    .symbol = pos.symbol,
+                    .portfolio_shares = pos.shares,
+                    .brokerage_shares = null,
+                    .portfolio_value = mv,
+                    .brokerage_value = null,
+                    .shares_delta = null,
+                    .value_delta = null,
+                    .is_cash = false,
+                    .only_in_brokerage = false,
+                    .only_in_portfolio = true,
+                });
+            }
+        }
+
+        try results.append(allocator, .{
+            .account_name = portfolio_acct_name orelse "",
+            .brokerage_name = broker_name,
+            .account_number = acct_num,
+            .comparisons = try comparisons.toOwnedSlice(allocator),
+            .portfolio_total = portfolio_total,
+            .brokerage_total = brokerage_total,
+            .total_delta = brokerage_total - portfolio_total,
+            .has_discrepancies = has_discrepancies,
+        });
+    }
+
+    return results.toOwnedSlice(allocator);
+}
+
+// ── Display ─────────────────────────────────────────────────
+
+fn displayResults(results: []const AccountComparison, color: bool, out: *std.Io.Writer) !void {
+    try cli.setBold(out, color);
+    try out.print("\nPortfolio Audit\n", .{});
+    try cli.reset(out, color);
+    try out.print("========================================\n\n", .{});
+
+    var total_portfolio: f64 = 0;
+    var total_brokerage: f64 = 0;
+    var discrepancy_count: usize = 0;
+
+    for (results) |acct| {
+        // Account header
+        try cli.setBold(out, color);
+        if (acct.account_name.len > 0) {
+            try out.print("  {s}", .{acct.account_name});
+            try cli.reset(out, color);
+            try cli.setFg(out, color, cli.CLR_MUTED);
+            try out.print("  ({s}, #{s})\n", .{ acct.brokerage_name, acct.account_number });
+        } else {
+            try out.print("  {s} #{s}", .{ acct.brokerage_name, acct.account_number });
+            try cli.reset(out, color);
+            try cli.setFg(out, color, cli.CLR_WARNING);
+            try out.print("  (unmapped — add account_number to accounts.srf)\n", .{});
+        }
+        try cli.reset(out, color);
+
+        // Column headers
+        try cli.setFg(out, color, cli.CLR_MUTED);
+        try out.print("    {s:<24} {s:>12} {s:>12} {s:>14} {s:>14} {s}\n", .{
+            "Symbol", "PF Shares", "BR Shares", "PF Value", "BR Value", "Status",
+        });
+        try cli.reset(out, color);
+
+        for (acct.comparisons) |cmp| {
+            var pf_shares_buf: [16]u8 = undefined;
+            var br_shares_buf: [16]u8 = undefined;
+            var pf_val_buf: [24]u8 = undefined;
+            var br_val_buf: [24]u8 = undefined;
+
+            const pf_shares_str = if (cmp.is_cash)
+                "--"
+            else
+                std.fmt.bufPrint(&pf_shares_buf, "{d:.3}", .{cmp.portfolio_shares}) catch "?";
+
+            const br_shares_str = if (cmp.is_cash)
+                "--"
+            else if (cmp.brokerage_shares) |s|
+                (std.fmt.bufPrint(&br_shares_buf, "{d:.3}", .{s}) catch "?")
+            else
+                "--";
+
+            const pf_val_str = fmt.fmtMoneyAbs(&pf_val_buf, cmp.portfolio_value);
+
+            const br_val_str = if (cmp.brokerage_value) |v|
+                fmt.fmtMoneyAbs(&br_val_buf, @abs(v))
+            else
+                "--";
+
+            // Determine status
+            var status_buf: [64]u8 = undefined;
+            const status: []const u8 = blk: {
+                if (cmp.only_in_brokerage) break :blk "Brokerage only";
+                if (cmp.only_in_portfolio) break :blk "Portfolio only";
+
+                const shares_ok = if (cmp.shares_delta) |d| @abs(d) < 0.01 else true;
+                const value_ok = if (cmp.value_delta) |d| @abs(d) < 1.0 else true;
+
+                if (shares_ok and value_ok) break :blk "ok";
+
+                if (!shares_ok) {
+                    if (cmp.shares_delta) |d| {
+                        const sign: []const u8 = if (d > 0) "+" else "";
+                        break :blk std.fmt.bufPrint(&status_buf, "Shares {s}{d:.3}", .{ sign, d }) catch "Shares mismatch";
+                    }
+                }
+                if (!value_ok) {
+                    if (cmp.value_delta) |d| {
+                        var delta_buf: [24]u8 = undefined;
+                        const delta_str = fmt.fmtMoneyAbs(&delta_buf, @abs(d));
+                        const sign: []const u8 = if (d >= 0) "+" else "-";
+                        break :blk std.fmt.bufPrint(&status_buf, "Value {s}{s}", .{ sign, delta_str }) catch "Value mismatch";
+                    }
+                }
+                break :blk "Mismatch";
+            };
+
+            // Color the status
+            const is_ok = std.mem.eql(u8, status, "ok");
+            if (!is_ok) discrepancy_count += 1;
+
+            try out.print("    {s:<24} {s:>12} {s:>12} {s:>14} {s:>14} ", .{
+                cmp.symbol, pf_shares_str, br_shares_str, pf_val_str, br_val_str,
+            });
+            if (is_ok) {
+                try cli.setFg(out, color, cli.CLR_POSITIVE);
+            } else {
+                try cli.setFg(out, color, cli.CLR_WARNING);
+            }
+            try out.print("{s}\n", .{status});
+            try cli.reset(out, color);
+        }
+
+        // Account totals
+        var pf_total_buf: [24]u8 = undefined;
+        var br_total_buf: [24]u8 = undefined;
+        var delta_buf: [24]u8 = undefined;
+        try cli.setFg(out, color, cli.CLR_MUTED);
+        try out.print("    {s:<24} {s:>12} {s:>12} {s:>14} {s:>14} ", .{
+            "", "", "", fmt.fmtMoneyAbs(&pf_total_buf, acct.portfolio_total), fmt.fmtMoneyAbs(&br_total_buf, acct.brokerage_total),
+        });
+        try cli.reset(out, color);
+
+        if (@abs(acct.total_delta) < 1.0) {
+            try cli.setFg(out, color, cli.CLR_POSITIVE);
+            try out.print("ok\n", .{});
+        } else {
+            try cli.setFg(out, color, cli.CLR_WARNING);
+            const sign: []const u8 = if (acct.total_delta >= 0) "+" else "-";
+            try out.print("Delta {s}{s}\n", .{ sign, fmt.fmtMoneyAbs(&delta_buf, @abs(acct.total_delta)) });
+        }
+        try cli.reset(out, color);
+        try out.print("\n", .{});
+
+        total_portfolio += acct.portfolio_total;
+        total_brokerage += acct.brokerage_total;
+    }
+
+    // Grand totals
+    var pf_grand_buf: [24]u8 = undefined;
+    var br_grand_buf: [24]u8 = undefined;
+    var grand_delta_buf: [24]u8 = undefined;
+    const grand_delta = total_brokerage - total_portfolio;
+
+    try cli.setBold(out, color);
+    try out.print("  Total: portfolio {s}  brokerage {s}", .{
+        fmt.fmtMoneyAbs(&pf_grand_buf, total_portfolio),
+        fmt.fmtMoneyAbs(&br_grand_buf, total_brokerage),
+    });
+    try cli.reset(out, color);
+
+    if (@abs(grand_delta) < 1.0) {
+        try cli.setFg(out, color, cli.CLR_POSITIVE);
+        try out.print("  ok", .{});
+    } else {
+        try cli.setFg(out, color, cli.CLR_WARNING);
+        const sign: []const u8 = if (grand_delta >= 0) "+" else "-";
+        try out.print("  delta {s}{s}", .{ sign, fmt.fmtMoneyAbs(&grand_delta_buf, @abs(grand_delta)) });
+    }
+    try cli.reset(out, color);
+    try out.print("\n", .{});
+
+    if (discrepancy_count > 0) {
+        try cli.setFg(out, color, cli.CLR_WARNING);
+        try out.print("  {d} discrepancies found\n", .{discrepancy_count});
+        try cli.reset(out, color);
+    } else {
+        try cli.setFg(out, color, cli.CLR_POSITIVE);
+        try out.print("  All positions match\n", .{});
+        try cli.reset(out, color);
+    }
+    try out.print("\n", .{});
+}
+
+// ── CLI entry point ─────────────────────────────────────────
+
+pub fn run(allocator: std.mem.Allocator, svc: *zfin.DataService, args: []const []const u8, color: bool, out: *std.Io.Writer) !void {
+    // Parse flags: --fidelity <csv> [--portfolio <file>]
+    var fidelity_csv: ?[]const u8 = null;
+    var portfolio_path: []const u8 = "portfolio.srf";
+
+    var i: usize = 0;
+    while (i < args.len) : (i += 1) {
+        if (std.mem.eql(u8, args[i], "--fidelity") and i + 1 < args.len) {
+            i += 1;
+            fidelity_csv = args[i];
+        } else if ((std.mem.eql(u8, args[i], "--portfolio") or std.mem.eql(u8, args[i], "-p")) and i + 1 < args.len) {
+            i += 1;
+            portfolio_path = args[i];
+        } else if (std.mem.eql(u8, args[i], "--no-color")) {
+            // handled globally
+        }
+    }
+
+    if (fidelity_csv == null) {
+        try cli.stderrPrint("Usage: zfin audit --fidelity <positions.csv> [-p <portfolio.srf>]\n");
+        return;
+    }
+
+    // Load portfolio
+    const pf_data = std.fs.cwd().readFileAlloc(allocator, portfolio_path, 10 * 1024 * 1024) catch {
+        try cli.stderrPrint("Error: Cannot read portfolio file\n");
+        return;
+    };
+    defer allocator.free(pf_data);
+
+    var portfolio = zfin.cache.deserializePortfolio(allocator, pf_data) catch {
+        try cli.stderrPrint("Error: Cannot parse portfolio file\n");
+        return;
+    };
+    defer portfolio.deinit();
+
+    // Load accounts.srf
+    const dir_end = if (std.mem.lastIndexOfScalar(u8, portfolio_path, std.fs.path.sep)) |idx| idx + 1 else 0;
+    const acct_path = std.fmt.allocPrint(allocator, "{s}accounts.srf", .{portfolio_path[0..dir_end]}) catch return;
+    defer allocator.free(acct_path);
+
+    const acct_data = std.fs.cwd().readFileAlloc(allocator, acct_path, 1024 * 1024) catch {
+        try cli.stderrPrint("Error: Cannot read accounts.srf (needed for account number mapping)\n");
+        return;
+    };
+    defer allocator.free(acct_data);
+
+    var account_map = analysis.parseAccountsFile(allocator, acct_data) catch {
+        try cli.stderrPrint("Error: Cannot parse accounts.srf\n");
+        return;
+    };
+    defer account_map.deinit();
+
+    // Load brokerage data
+    if (fidelity_csv) |csv_path| {
+        const csv_data = std.fs.cwd().readFileAlloc(allocator, csv_path, 10 * 1024 * 1024) catch {
+            var msg_buf: [256]u8 = undefined;
+            const msg = std.fmt.bufPrint(&msg_buf, "Error: Cannot read CSV file: {s}\n", .{csv_path}) catch "Error: Cannot read CSV file\n";
+            try cli.stderrPrint(msg);
+            return;
+        };
+        defer allocator.free(csv_data);
+
+        const brokerage_positions = parseFidelityCsv(allocator, csv_data) catch {
+            try cli.stderrPrint("Error: Cannot parse Fidelity CSV (unexpected format?)\n");
+            return;
+        };
+        defer allocator.free(brokerage_positions);
+
+        // Get cached prices (no network fetching — use whatever is cached)
+        var prices = std.StringHashMap(f64).init(allocator);
+        defer prices.deinit();
+
+        const positions = try portfolio.positions(allocator);
+        defer allocator.free(positions);
+
+        for (positions) |pos| {
+            if (svc.getCachedLastClose(pos.symbol)) |close| {
+                try prices.put(pos.symbol, close);
+            }
+        }
+
+        // Also resolve manual prices
+        for (portfolio.lots) |lot| {
+            if (lot.price) |p| {
+                if (!prices.contains(lot.priceSymbol())) {
+                    try prices.put(lot.priceSymbol(), p * lot.price_ratio);
+                }
+            }
+        }
+
+        const results = try compareAccounts(allocator, portfolio, brokerage_positions, account_map, "fidelity", prices);
+        defer {
+            for (results) |r| allocator.free(r.comparisons);
+            allocator.free(results);
+        }
+
+        try displayResults(results, color, out);
+    }
+}
+
+// ── Tests ────────────────────────────────────────────────────
+
+test "parseDollarAmount" {
+    try std.testing.expectApproxEqAbs(@as(f64, 1234.56), parseDollarAmount("$1,234.56").?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, 7140.33), parseDollarAmount("$7140.33").?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, 3732.40), parseDollarAmount("+$3,732.40").?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, -6300.00), parseDollarAmount("-$6,300.00").?, 0.01);
+    try std.testing.expect(parseDollarAmount("") == null);
+    try std.testing.expect(parseDollarAmount("  ") == null);
+    try std.testing.expectApproxEqAbs(@as(f64, 301), parseDollarAmount("301").?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, 2387.616), parseDollarAmount("2387.616").?, 0.001);
+}
+
+test "parseFidelityCsv basic" {
+    const csv =
+        "\xEF\xBB\xBF" ++ // BOM
+        "Account Number,Account Name,Symbol,Description,Quantity,Last Price,Last Price Change,Current Value,Today's Gain/Loss Dollar,Today's Gain/Loss Percent,Total Gain/Loss Dollar,Total Gain/Loss Percent,Percent Of Account,Cost Basis Total,Average Cost Basis,Type\r\n" ++
+        "Z123,Individual,FZFXX**,HELD IN MONEY MARKET,,,,$5000.00,,,,,50%,,,Cash,\r\n" ++
+        "Z123,Individual,AAPL,APPLE INC,100,$150.00,+$2.00,$15000.00,+$200.00,+1.35%,+$5000.00,+50.00%,50%,$10000.00,$100.00,Margin,\r\n" ++
+        "\r\n" ++
+        "\"Disclaimer text\"\r\n";
+
+    const allocator = std.testing.allocator;
+    const positions = try parseFidelityCsv(allocator, csv);
+    defer allocator.free(positions);
+
+    try std.testing.expectEqual(@as(usize, 2), positions.len);
+
+    // Cash position
+    try std.testing.expectEqualStrings("FZFXX", positions[0].symbol);
+    try std.testing.expect(positions[0].is_cash);
+    try std.testing.expectApproxEqAbs(@as(f64, 5000.00), positions[0].current_value.?, 0.01);
+    try std.testing.expect(positions[0].quantity == null);
+
+    // Stock position
+    try std.testing.expectEqualStrings("AAPL", positions[1].symbol);
+    try std.testing.expect(!positions[1].is_cash);
+    try std.testing.expectApproxEqAbs(@as(f64, 100), positions[1].quantity.?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, 15000.00), positions[1].current_value.?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, 10000.00), positions[1].cost_basis.?, 0.01);
+}
+
+test "parseFidelityCsv stops at blank line" {
+    const csv =
+        "Account Number,Account Name,Symbol,Description,Quantity,Last Price,Last Price Change,Current Value,Today's Gain/Loss Dollar,Today's Gain/Loss Percent,Total Gain/Loss Dollar,Total Gain/Loss Percent,Percent Of Account,Cost Basis Total,Average Cost Basis,Type\n" ++
+        "Z123,Individual,AAPL,APPLE INC,50,$150.00,+$2.00,$7500.00,+$100.00,+1.35%,+$2500.00,+50.00%,100%,$5000.00,$100.00,Margin,\n" ++
+        "\n" ++
+        "Z123,Individual,MSFT,SHOULD NOT APPEAR,10,$300.00,,,$3000.00,,,,,,,,\n";
+
+    const allocator = std.testing.allocator;
+    const positions = try parseFidelityCsv(allocator, csv);
+    defer allocator.free(positions);
+
+    try std.testing.expectEqual(@as(usize, 1), positions.len);
+    try std.testing.expectEqualStrings("AAPL", positions[0].symbol);
+}
+
+test "parseFidelityCsv option row" {
+    const csv =
+        "Account Number,Account Name,Symbol,Description,Quantity,Last Price,Last Price Change,Current Value,Today's Gain/Loss Dollar,Today's Gain/Loss Percent,Total Gain/Loss Dollar,Total Gain/Loss Percent,Percent Of Account,Cost Basis Total,Average Cost Basis,Type\n" ++
+        "Z123,Individual, -AMZN260515C220,AMZN MAY 15 2026 $220 CALL,-3,$21.00,+$8.60,-$6300.00,-$2580.00,-69.36%,-$3674.02,-139.92%,-8.85%,$2625.98,$8.75,Margin,\n";
+
+    const allocator = std.testing.allocator;
+    const positions = try parseFidelityCsv(allocator, csv);
+    defer allocator.free(positions);
+
+    try std.testing.expectEqual(@as(usize, 1), positions.len);
+    try std.testing.expectEqualStrings("-AMZN260515C220", positions[0].symbol);
+    try std.testing.expectApproxEqAbs(@as(f64, -3), positions[0].quantity.?, 0.01);
+    try std.testing.expectApproxEqAbs(@as(f64, -6300.00), positions[0].current_value.?, 0.01);
+}
+
+test "parseFidelityCsv empty file" {
+    const allocator = std.testing.allocator;
+    const result = parseFidelityCsv(allocator, "");
+    try std.testing.expectError(error.EmptyFile, result);
+}
+
+test "parseFidelityCsv wrong header" {
+    const allocator = std.testing.allocator;
+    const result = parseFidelityCsv(allocator, "Wrong,Header,Format\n");
+    try std.testing.expectError(error.UnexpectedHeader, result);
+}
+
+test "parseFidelityCsv cash account type is not cash position" {
+    // Fidelity's Type column says "Cash" for cash-account positions (vs "Margin").
+    // This does NOT mean the security is a cash holding — only ** suffix means that.
+    const csv =
+        "Account Number,Account Name,Symbol,Description,Quantity,Last Price,Last Price Change,Current Value,Today's Gain/Loss Dollar,Today's Gain/Loss Percent,Total Gain/Loss Dollar,Total Gain/Loss Percent,Percent Of Account,Cost Basis Total,Average Cost Basis,Type\n" ++
+        "X99,HSA,QTUM,DEFIANCE QUANTUM ETF,190,$116.14,+$0.31,$22066.60,+$58.90,+0.26%,+$1185.60,+5.67%,99.64%,$20881.00,$109.90,Cash,\n";
+
+    const allocator = std.testing.allocator;
+    const positions = try parseFidelityCsv(allocator, csv);
+    defer allocator.free(positions);
+
+    try std.testing.expectEqual(@as(usize, 1), positions.len);
+    try std.testing.expectEqualStrings("QTUM", positions[0].symbol);
+    try std.testing.expect(!positions[0].is_cash);
+    try std.testing.expectApproxEqAbs(@as(f64, 190), positions[0].quantity.?, 0.01);
+}
diff --git a/src/main.zig b/src/main.zig
index c14cd8f..f9d9bb0 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -20,6 +20,7 @@ const usage =
     \\  analysis [FILE]      Show portfolio analysis (default: portfolio.srf)
     \\  enrich <FILE|SYMBOL> Bootstrap metadata.srf from Alpha Vantage (25 req/day limit)
     \\  lookup <CUSIP>       Look up CUSIP to ticker via OpenFIGI
+    \\  audit [opts]         Reconcile portfolio against brokerage export
     \\  cache stats          Show cache statistics
     \\  cache clear          Clear all cached data
     \\
@@ -42,6 +43,10 @@ const usage =
     \\  -w, --watchlist <FILE>   Watchlist file
     \\  --refresh                Force refresh (ignore cache, re-fetch all prices)
     \\
+    \\Audit command options:
+    \\  --fidelity <CSV>         Fidelity positions CSV export (download from "All accounts" positions tab)
+    \\  -p, --portfolio <FILE>   Portfolio file (default: portfolio.srf)
+    \\
     \\Analysis command:
     \\  Reads metadata.srf (classification) and accounts.srf (tax types)
     \\  from the same directory as the portfolio file.
@@ -108,6 +113,7 @@ pub fn main() !u8 {
     if (args.len >= 3 and
         !std.mem.eql(u8, command, "cache") and
         !std.mem.eql(u8, command, "enrich") and
+        !std.mem.eql(u8, command, "audit") and
         !std.mem.eql(u8, command, "analysis") and
         !std.mem.eql(u8, command, "portfolio"))
     {
@@ -214,6 +220,8 @@ pub fn main() !u8 {
             return 1;
         }
         try commands.enrich.run(allocator, &svc, args[2], out);
+    } else if (std.mem.eql(u8, command, "audit")) {
+        try commands.audit.run(allocator, &svc, args[2..], color, out);
     } else if (std.mem.eql(u8, command, "analysis")) {
         // File path is first non-flag arg (default: portfolio.srf)
         var analysis_file: []const u8 = "portfolio.srf";
@@ -248,6 +256,7 @@ const commands = struct {
     const lookup = @import("commands/lookup.zig");
     const cache = @import("commands/cache.zig");
     const analysis = @import("commands/analysis.zig");
+    const audit = @import("commands/audit.zig");
     const enrich = @import("commands/enrich.zig");
 };
 
diff --git a/src/models/portfolio.zig b/src/models/portfolio.zig
index a0b87d2..be54e3c 100644
--- a/src/models/portfolio.zig
+++ b/src/models/portfolio.zig
@@ -126,6 +126,9 @@ pub const Lot = struct {
 /// Aggregated position for a single symbol across multiple lots.
 pub const Position = struct {
     symbol: []const u8,
+    /// Original lot symbol before ticker aliasing (e.g. CUSIP "02315N600").
+    /// Same as `symbol` when no ticker alias is set.
+    lot_symbol: []const u8 = "",
     /// Total open shares
     shares: f64,
     /// Weighted average cost basis per share (open lots only)
@@ -252,6 +255,7 @@ pub const Portfolio = struct {
             if (!entry.found_existing) {
                 entry.value_ptr.* = .{
                     .symbol = sym,
+                    .lot_symbol = lot.symbol,
                     .shares = 0,
                     .avg_cost = 0,
                     .total_cost = 0,
@@ -302,6 +306,78 @@ pub const Portfolio = struct {
         return result.toOwnedSlice(allocator);
     }
 
+    /// Aggregate stock/ETF lots into positions for a single account.
+    /// Same logic as positions() but filtered to lots matching `account_name`.
+    /// Only includes positions with at least one open lot (closed-only symbols are excluded).
+    pub fn positionsForAccount(self: Portfolio, allocator: std.mem.Allocator, account_name: []const u8) ![]Position {
+        var map = std.StringHashMap(Position).init(allocator);
+        defer map.deinit();
+
+        for (self.lots) |lot| {
+            if (lot.security_type != .stock) continue;
+            const lot_acct = lot.account orelse continue;
+            if (!std.mem.eql(u8, lot_acct, account_name)) continue;
+
+            const sym = lot.priceSymbol();
+            const entry = try map.getOrPut(sym);
+            if (!entry.found_existing) {
+                entry.value_ptr.* = .{
+                    .symbol = sym,
+                    .lot_symbol = lot.symbol,
+                    .shares = 0,
+                    .avg_cost = 0,
+                    .total_cost = 0,
+                    .open_lots = 0,
+                    .closed_lots = 0,
+                    .realized_gain_loss = 0,
+                    .account = lot_acct,
+                    .note = lot.note,
+                    .price_ratio = lot.price_ratio,
+                };
+            } else {
+                if (entry.value_ptr.price_ratio == 1.0 and lot.price_ratio != 1.0) {
+                    entry.value_ptr.price_ratio = lot.price_ratio;
+                }
+            }
+            if (lot.isOpen()) {
+                entry.value_ptr.shares += lot.shares;
+                entry.value_ptr.total_cost += lot.costBasis();
+                entry.value_ptr.open_lots += 1;
+            } else {
+                entry.value_ptr.closed_lots += 1;
+                entry.value_ptr.realized_gain_loss += lot.realizedGainLoss() orelse 0;
+            }
+        }
+
+        var iter = map.valueIterator();
+        while (iter.next()) |pos| {
+            if (pos.shares > 0) {
+                pos.avg_cost = pos.total_cost / pos.shares;
+            }
+        }
+
+        var result = std.ArrayList(Position).empty;
+        errdefer result.deinit(allocator);
+
+        var viter = map.valueIterator();
+        while (viter.next()) |pos| {
+            if (pos.open_lots == 0) continue;
+            try result.append(allocator, pos.*);
+        }
+        return result.toOwnedSlice(allocator);
+    }
+
+    /// Total cash for a single account.
+    pub fn cashForAccount(self: Portfolio, account_name: []const u8) f64 {
+        var total: f64 = 0;
+        for (self.lots) |lot| {
+            if (lot.security_type != .cash) continue;
+            const lot_acct = lot.account orelse continue;
+            if (std.mem.eql(u8, lot_acct, account_name)) total += lot.shares;
+        }
+        return total;
+    }
+
     /// Total cost basis of all open stock lots.
     pub fn totalCostBasis(self: Portfolio) f64 {
         var total: f64 = 0;
@@ -564,3 +640,34 @@ test "positions propagates price_ratio from lot" {
         }
     }
 }
+
+test "positionsForAccount excludes closed-only symbols" {
+    const allocator = std.testing.allocator;
+
+    var lots = [_]Lot{
+        // Open lot in account A
+        .{ .symbol = "AAPL", .shares = 10, .open_date = Date.fromYmd(2024, 1, 1), .open_price = 150.0, .account = "Acct A" },
+        // Closed lot in account A (was sold)
+        .{ .symbol = "XLV", .shares = 100, .open_date = Date.fromYmd(2024, 1, 1), .open_price = 140.0, .close_date = Date.fromYmd(2025, 1, 1), .close_price = 150.0, .account = "Acct A" },
+        // Open lot for same symbol in a different account
+        .{ .symbol = "XLV", .shares = 50, .open_date = Date.fromYmd(2024, 1, 1), .open_price = 140.0, .account = "Acct B" },
+    };
+
+    var portfolio = Portfolio{ .lots = &lots, .allocator = allocator };
+
+    // Account A: should only see AAPL (XLV is fully closed there)
+    const pos_a = try portfolio.positionsForAccount(allocator, "Acct A");
+    defer allocator.free(pos_a);
+
+    try std.testing.expectEqual(@as(usize, 1), pos_a.len);
+    try std.testing.expectEqualStrings("AAPL", pos_a[0].symbol);
+    try std.testing.expectApproxEqAbs(@as(f64, 10.0), pos_a[0].shares, 0.01);
+
+    // Account B: should see XLV with 50 shares
+    const pos_b = try portfolio.positionsForAccount(allocator, "Acct B");
+    defer allocator.free(pos_b);
+
+    try std.testing.expectEqual(@as(usize, 1), pos_b.len);
+    try std.testing.expectEqualStrings("XLV", pos_b[0].symbol);
+    try std.testing.expectApproxEqAbs(@as(f64, 50.0), pos_b[0].shares, 0.01);
+}