The Data

Coverage & Limitations

Universe

Roughly 32,000 US-listed mutual funds and ETFs, keyed by bare ticker (code, e.g. SPY). Each fund carries reference metadata: name, country, exchange, currency, type, isin, and its available return-date range (min_return_date / max_return_date).

History depth

History extends back to each fund's inception — there's no fixed start date. min_return_date tells you how far back a given fund goes; return_earliest_available gives its since-inception annualized return.

Survivorship-bias-free

Delisted and closed funds are kept, with their full historical returns intact — they're never dropped from the dataset. Inactive funds are marked is_inactive = true with an inactive_date. This means backtests and historical comparisons include funds that no longer trade, so results aren't skewed by only looking at today's survivors.

What's covered

Trailing total returns for 16 periods: 1d, 1w, 1m, 3m, 6m, ytd, 1y, 2y, 3y, 4y, 5y, 7y, 10y, 15y, 20y, and since-inception (earliest_available).
Calendar-year total returns, one per fund per year, back to inception.
Fund reference data for search and lookup.

What's not covered

To set expectations up front, the API is fund-level returns only. It does not provide:

Individual equities, bonds, or other non-fund securities — mutual funds and ETFs only.
Non-US funds — the universe is US-listed. (market is accepted on requests but is informational today; all codes resolve as US tickers.)
Intraday or real-time prices — returns are computed from end-of-day pricing.
Raw price series / NAV history — you get computed returns, not the underlying daily prices.
Holdings, expense ratios, AUM, fund flows, or other fundamentals — performance returns only.
Arbitrary date-range series — endpoints are point lookups (latest, a specific as_of date, or a specific calendar year), not a from/to time series. One fund has far too many daily rows to page a full range through the API; for full history in bulk, use the Snowflake Marketplace dataset.

Freshness

Data is refreshed on trading days — incremental updates five days a week and full rebuilds twice a week. See Freshness & updates for the exact schedule.

Last modified on September 8, 2026

Methodology Field reference

Survivorship-bias-free

What's not covered

To set expectations up front, the API is fund-level returns only. It does not provide:

Individual equities, bonds, or other non-fund securities — mutual funds and ETFs only.

Non-US funds — the universe is US-listed. (market is accepted on requests but is informational today; all codes resolve as US tickers.)

Intraday or real-time prices — returns are computed from end-of-day pricing.

Raw price series / NAV history — you get computed returns, not the underlying daily prices.

Holdings, expense ratios, AUM, fund flows, or other fundamentals — performance returns only.

Arbitrary date-range series — endpoints are point lookups (latest, a specific as_of date, or a specific calendar year), not a from/to time series. One fund has far too many daily rows to page a full range through the API; for full history in bulk, use the Snowflake Marketplace dataset.