# `zfin lookup`

Resolve a CUSIP (9-character security identifier) to its ticker via the
OpenFIGI API.

```
Usage: zfin lookup <CUSIP>
```

Successful results are cached indefinitely in `cusip_tickers.srf`.
`OPENFIGI_API_KEY` raises the rate limit, but the unauthenticated tier
works for low volume. Mutual funds frequently have no OpenFIGI
coverage; the command says so and suggests a manual portfolio entry.

## Example

```bash
zfin lookup 037833100
```

```
037833100  →  AAPL
```

Use this when a holding in your portfolio is identified by CUSIP (e.g.
a 401k share class) and you need its ticker for a `ticker::` alias. See
[ticker aliases](../config/portfolio-srf.md#ticker-aliases-and-cusips).

## See also

- [`portfolio.srf` reference](../config/portfolio-srf.md) -- using `ticker::` aliases.
- [Environment variables](../config/environment.md) -- `OPENFIGI_API_KEY`.

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[CLI command reference](index.md)