13F Filing Deadlines 2026: The Complete Calendar

Institutional managers must file Form 13F within 45 calendar days of the end of each calendar quarter. That single rule creates the four predictable "13F seasons" each year — the windows when hedge-fund holdings become public and the financial press fills with "what the smart money bought" coverage.

2026 deadlines

Deadlines shift by a day or two when the 45th day lands on a weekend or holiday (the deadline rolls to the next business day). Most large managers file at or near the deadline, so the meaningful holdings data lands in a cluster in the final days of each window.

Why the 45-day delay exists

The lag is deliberate. It lets managers finish building or unwinding positions before competitors can see and front-run them. The trade-off is that by the time the public reads a 13F, the information is one to four months old — useful for understanding what an investor believes, far less useful for timing a trade.

How to use the calendar

• •Mark the four deadlines. The data you care about arrives in the last few days of each window.
• •Watch the marquee filers first — Berkshire, the big activists — then look for cross-fund overlap, which is more informative than any single filing.
• •Remember the holdings are as of quarter-end, not filing day. A "new buy" disclosed in mid-August reflects a position established by June 30.
• •For the freshest insider signal between 13F seasons, watch Form 4 filings instead — those report within two business days.