The 13F Filing Calendar: Key Dates Every Investor Should Track
The 13F filing calendar is one of the most predictable cycles in institutional investing. Every quarter, the SEC requires large money managers to disclose their equity holdings within 45 days of quarter end. Yet many investors are caught off guard when filings drop, scrambling to parse data that others have been preparing for weeks in advance. Knowing the calendar --- and more importantly, understanding the patterns around it --- gives you a structural advantage.
The Quarterly Filing Schedule
The SEC mandates four filing periods per year, each with a hard deadline:
| Quarter | Period Covered | Filing Deadline | Data Typically Available |
|---|---|---|---|
| Q1 | January 1 — March 31 | May 15 | Late April — mid May |
| Q2 | April 1 — June 30 | August 14 | Late July — mid August |
| Q3 | July 1 — September 30 | November 14 | Late October — mid November |
| Q4 | October 1 — December 31 | February 14 | Late January — mid February |
When a deadline falls on a weekend or federal holiday, the actual due date shifts to the next business day. For example, if February 14 is a Saturday, the Q4 filings are due the following Monday.
Why 45 Days?
The 45-day window exists because the SEC balances transparency with operational practicality. Funds need time to reconcile quarter-end positions, verify CUSIP identifiers, and prepare the filing. Shorter deadlines have been proposed but never adopted. The delay also means that by the time you see a filing, the data is at minimum 45 days old and potentially reflects positions that have already changed.
When Filings Actually Appear
The filing deadline is the latest a fund can submit. In practice, many funds file well before the deadline, and the distribution follows a predictable pattern:
Early Filers (Days 1-20 after quarter end)
A small group of funds files within the first three weeks. These tend to be:
- Funds with simple, concentrated portfolios that are easy to reconcile
- Managers who want to signal transparency or attract capital
- Funds required to file early by their limited partnership agreements
Early filings often receive more attention simply because they are first. Markets are hungry for new data, and the first major filing of the season typically generates significant media coverage.
Peak Filing Window (Days 30-45)
The majority of filings arrive in the final two weeks before the deadline. This is when the most valuable data emerges, because it includes the largest and most well-known managers. Expect a flood of new data during this period.
| Filing Window | % of Filings | Notable Filers |
|---|---|---|
| Days 1-20 | ~15% | Smaller funds, transparent managers |
| Days 21-35 | ~30% | Mid-size funds, some large managers |
| Days 36-45 | ~55% | Largest funds, most well-known managers |
Late and Amended Filings
Some funds miss the deadline or file amendments weeks or months later. The SEC grants confidential treatment requests that allow funds to delay disclosure of certain positions if revealing them would harm the fund’s strategy. These delayed disclosures can be significant because they often involve positions the fund was actively building.
Watch for Amendments
Amended filings (13F-HR/A) are frequently overlooked. A fund might file on time with most positions, then file an amendment weeks later adding previously confidential positions. These late additions are often the most interesting trades because the fund specifically requested to keep them hidden.
How to Prepare for Each Filing Season
A systematic approach to each filing cycle maximizes the value you extract from the data:
Two Weeks Before the Deadline
- Review your current positions against the funds you track. Know what you expect to see so you can quickly identify surprises.
- Set up alerts for the specific funds you follow. Our platform processes new filings within days of their appearance on EDGAR.
- Note the previous quarter’s holdings for your tracked managers so you can immediately spot changes.
During the Filing Window
- Focus on changes, not holdings. New positions, exits, and significant increases or decreases carry the most signal.
- Look for convergence. When multiple independent managers make similar moves in the same quarter, the signal strengthens.
- Cross-reference with insider trading. Check whether corporate insiders have been buying or selling stocks that appear in new 13F filings.
After the Deadline
- Review aggregate data. After most filings are in, look at sector-level shifts, consensus positions, and concentration trends across all tracked managers.
- Watch for late amendments that add previously confidential positions.
- Update your watchlist based on new findings.
Filing Season Overlap with Earnings
Each filing season coincides with earnings season, which creates a rich analytical environment:
| Season | 13F Data Reflects | Earnings Reports Cover |
|---|---|---|
| Feb (Q4 filings) | Oct — Dec positions | Q4 earnings |
| May (Q1 filings) | Jan — Mar positions | Q1 earnings |
| Aug (Q2 filings) | Apr — Jun positions | Q2 earnings |
| Nov (Q3 filings) | Jul — Sep positions | Q3 earnings |
This overlap is useful because you can compare what managers held during a quarter with the earnings results that quarter produced. A fund that added to a position before strong earnings may have had insight that wasn’t yet public. A fund that exited before a miss may have recognized deteriorating fundamentals early.
Special Filings to Watch
Beyond the standard quarterly 13F, several related filings provide additional context:
13F-NT (Notice of Late Filing)
If a manager cannot file on time, they must submit a 13F-NT explaining the delay and providing an expected filing date. This is a red flag worth monitoring --- it could indicate operational issues at the fund or a complicated quarter with many position changes.
13G and 13D Filings
These are triggered when an investor crosses the 5% ownership threshold in a company. Unlike 13F filings, which are quarterly snapshots, 13G and 13D filings are event-driven and must be filed within 10 days. They often reveal major new positions before the next 13F.
Form 4 Filings
While not part of the 13F calendar, Form 4 insider trading filings are reported within 2 business days and can provide real-time signals that complement the quarterly 13F data.
Filing Dates Are Not Trading Dates
A 13F filing tells you what a fund held on the last day of the quarter. It does not tell you when during the quarter they bought or sold. A new position might have been initiated on the first day of the quarter or the last. Treat the data as directional, not precise.
Using DeepFilings During Filing Season
Our platform is designed to surface the most actionable data during each filing cycle:
- The Activity page shows the largest buys and sells across all tracked managers as new filings are processed
- Individual Hedge Fund pages update with quarter-over-quarter changes
- The Top Buys and Top Sells pages highlight the biggest dollar-value moves
- The Grand Portfolio aggregates positions across all 80+ tracked superinvestors
Bookmark these pages and check them regularly during each filing window. The most valuable insights emerge when you can compare fresh filing data against what managers held in previous quarters.
Mark Your Calendar
If you take one thing from this guide, let it be the four dates that matter most: February 14, May 15, August 14, and November 14. These are the deadlines around which the institutional investment world briefly lifts the veil. The data is delayed and incomplete, but it remains one of the most valuable free resources available to any investor willing to do the work.