Last updated: 16 August 2026

Every number on this site traces back to a public filing. This page explains which filings, how often we pull them, how the derived figures are calculated, and — the part most trackers skip — what this data genuinely cannot tell you.

Where the data comes from

ARK Invest ETFs

ARK is unusual: it publishes full holdings for its actively managed ETFs every trading day, plus a daily trade notification listing what it bought and sold. That's the basis for every ARK page here — ARKK, ARKW, ARKG, ARKF, ARKQ and ARKX.

We access this via arkfunds.io, a third-party API that aggregates ARK's published files. To be precise about it: that's an intermediary, not ARK itself. It's reliable in our experience, but it means an error upstream would propagate here. For anything that matters, verify against ARK's own published files.

13F filers (Berkshire, Scion)

Institutional managers with over $100m in US equities must file a Form 13F with the SEC each quarter. Those pages are built from the filings on SEC EDGAR, ingested after each quarterly filing deadline.

How often it updates

ARK holdings and trades — daily. The sync runs at 01:00 UTC, roughly four to five hours after US market close, which is when ARK has reliably published that day's files. Pages rebuild immediately after a successful sync.
13F holdings — quarterly, following each filing deadline.
Every data page shows its own "as of" date. Trust that date over anything stated here — if a sync fails, the date stops advancing, and that's the signal the data is stale.

How the figures are calculated

Holdings, share counts and weights are reported by the fund, passed through unchanged.
Trade values are estimates. ARK discloses the number of shares traded, not the price paid. Where a value is shown for a trade, it's the share count multiplied by a reference price for that day — not the fund's actual execution price. Real fills differ, sometimes materially on a volatile day. Treat these as scale indicators, not accounting figures.
Position history is assembled from our own daily snapshots, so it starts when we started collecting, not when the position did.

What this data can't tell you

These limits are inherent to the disclosures themselves. They apply to every tracker, this one included.

13F data is old on arrival. Filings are due 45 days after quarter-end, so a position may have been sold weeks before you read about it.
13Fs are long-only US equities. Short positions, bonds, cash, foreign listings and most derivatives never appear. A 13F can show a large stake in something the manager is net short overall.
Why is never disclosed. A sale might be conviction changing, or it might be redemptions, rebalancing, tax, or risk limits. Nothing in the filing distinguishes them, and any explanation you read — here or anywhere — is inference.
Copying trades doesn't replicate returns. You don't share the fund's entry price, time horizon, position sizing, or ability to absorb a drawdown.

Corrections

Data errors are possible, and we'd rather hear about them than not. Report one via the contact page and we'll check it against the source filing. Confirmed errors are fixed, and articles carry a note when a correction changes their substance.

Reminder. None of this is financial advice. It's public data, presented for educational purposes. See terms and about.