13F Filing Deadline Calculator: 2026 Dates, Rules, and Tools

If you manage institutional assets and need to know exactly when your next Form 13F is due, this guide gives you the calculated dates for every 2026 quarter, explains the arithmetic behind them, and walks through what a reliable 13F deadline calculator must do that generic SEC tools do not.

Key takeaway: Form 13F is due within 45 calendar days after each calendar quarter-end, with no extension available. For Q3 2026, that means Monday, November 16, 2026. For Q4 2026 (December 31), the deadline rolls all the way to Tuesday, February 17, 2027.

What Is the 13F Filing Deadline for 2026?

The deadline is 45 calendar days after the last day of each calendar quarter, per 17 CFR § 240.13f-1(a)(1). When the 45th day lands on a weekend or federal holiday observed by the SEC, the deadline rolls forward to the next business day.

Here are the four confirmed 2026 deadlines:

The Q3 date of November 16, 2026 is confirmed by the SecureX Filings deadline calculator. The Q4 date requires a double roll: February 14, 2027 is a Sunday, February 16 is Presidents' Day, so the deadline lands on Tuesday, February 17, 2027. This is the most commonly missed deadline of the year, partly because it falls in the middle of year-end close.

For the full breakdown of how each date was calculated and the adjustment logic, see 13F Filing Dates 2026: Every Deadline, the Adjustment Logic, and What to Do Now.

How to Calculate the 13F Deadline Yourself

The arithmetic is straightforward, but the common mistakes are not.

Here is the correct method:

1. Identify the calendar quarter-end date (always March 31, June 30, September 30, or December 31 for 13F purposes).
2. Count forward exactly 45 calendar days, including weekends and holidays in the count.
3. Check whether the 45th day is a Saturday, Sunday, or SEC-observed federal holiday.
4. If it is, roll forward to the next business day.
5. Verify against the SEC's federal holiday list before setting your internal deadline.

The single most common mistake compliance teams make is counting 45 business days instead of calendar days. That error adds roughly three weeks to the apparent deadline and creates a false sense of comfort. The rule is unambiguous: Rule 13f-1 says "within 45 days after the last day of each calendar year and each of the first three calendar quarters."

Federal holidays the SEC observes include: New Year's Day, MLK Day, Presidents' Day, Good Friday, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas. Note that Veterans Day falls on Wednesday, November 11, 2026, which is why the Q3 roll goes to Monday November 16 rather than Saturday November 15.

What a 13F Deadline Calculator Must Actually Do

Generic SEC filing deadline tools handle 10-K and 10-Q dates well. Most treat 13F as an afterthought. Here is what separates a tool that is genuinely useful for institutional compliance teams from one that just lists dates:

Minimum requirements

• Calendar-day counting, not business-day counting. Any tool that counts business days will produce wrong dates.
• Correct federal holiday list, updated annually. The observed date for a holiday that falls on a weekend shifts, and tools with static lists drift out of sync.
• Double-roll logic. When the 45th day is a Sunday and the following Monday is a holiday (as with Q4 2026), the tool must roll twice. Many tools only roll once.
• Coverage of all four calendar quarters. Some tools only calculate from a fiscal year-end input, which does not map to 13F's fixed calendar-quarter structure.

Features that add real compliance value

• Internal deadline offset. The best tools let you set a buffer (for example, "show me the deadline 5 business days before the SEC deadline") so the compliance calendar reflects the actual internal review cycle, not just the regulatory cutoff.
• EDGAR cutoff time warning. The SEC's EDGAR system accepts filings between 6:00 a.m. and 10:00 p.m. ET, but submissions received after 5:30 p.m. ET receive the next business day's filing date, per EDGAR's own FAQ. A tool that displays only the calendar date without flagging this cutoff is incomplete. Filing at 5:45 p.m. on November 16 is a late filing.
• Amendment tracking. Compliance teams that discover errors in previously filed 13F-HRs need to track 13F-HR/A submissions. A tool that surfaces amendment history alongside deadlines saves a manual EDGAR search.
• Threshold reminder. A tool that prompts users to verify the $100 million threshold as of the last trading day of the calendar year adds a layer of compliance hygiene that pure date calculators skip.

Tools currently available

*Broadridge's published calendar shows February 16, 2027 for Q4 2026. That date is Presidents' Day in 2027, which means the correct deadline is February 17, 2027. Always verify tool output against the federal holiday calendar before finalising your compliance calendar.

Warning: No publicly available tool currently flags the 5:30 p.m. ET EDGAR cutoff as part of the 13F deadline display. Build this into your internal workflow manually: treat 5:00 p.m. ET on the deadline date as your operational cutoff, not midnight.

The $100 Million Threshold: Who Must File

An institutional investment manager must file Form 13F if it exercises investment discretion over $100 million or more in Section 13(f) securities, measured on the last trading day of the calendar year, per the SEC's 13F FAQ.

A few points that trip up first-time filers and smaller managers:

• The threshold is tested once per year, on the last trading day of December. It is not re-tested each quarter.
• Once crossed, the obligation runs for the entire following calendar year, all four quarters.
• A manager that crosses the threshold for the first time mid-year must file for the quarter in which the threshold was first exceeded, within 45 days of that quarter-end. This catches growing managers off guard.
• The threshold applies only to Section 13(f) securities: exchange-listed equities, shares of closed-end investment companies, and certain convertible debt and equity options. U.S. Treasuries, municipal bonds, and most fixed-income instruments do not count.

In 2020, the SEC proposed raising this threshold from $100 million to $3.5 billion, which would have eliminated approximately 89% of then-current filers. After receiving over 1,600 comment letters, the vast majority opposing the change, the SEC formally withdrew the proposal in 2023, per Release No. 34-89290. The $100 million threshold remains in force today.

For a deeper treatment of threshold mechanics and what counts as a Section 13(f) security, see Form 13F FAQ: 45-Day Deadline, Short Positions, and 2026 Rules.

There Is No Extension for Form 13F

This is the rule that catches the most compliance officers by surprise. Unlike 10-K and 10-Q filers, who can file Form 12b-25 to obtain a 5- or 15-day extension, institutional managers have no equivalent relief for Form 13F. Missing the 45-day deadline is a violation of Section 13(f) regardless of the reason.

No tool, no filing agent, and no outside counsel can fix a late 13F after the fact. The only path is to file as quickly as possible and assess whether a voluntary disclosure to the SEC is appropriate.

Penalties under Section 32 of the Securities Exchange Act of 1934 can reach $100 per day for each day of non-compliance. The SEC has also used 13F non-compliance as a trigger for broader examinations, per SEC litigation releases.

Confidential Treatment and Amendments: Two Workflow Items Tools Overlook

Confidential treatment (Form 13F-CTR)

Managers can request confidential treatment for sensitive positions by filing Form 13F-CTR simultaneously with their 13F-HR. The request must demonstrate that public disclosure would reveal the manager's trading strategy and cause substantial harm. The SEC has tightened its standards for granting confidential treatment in recent years, per the SEC's 13F FAQ. A compliance workflow that does not include a pre-filing review of positions eligible for CTR is leaving a meaningful risk-management tool on the table.

Amendments (Form 13F-HR/A)

If a material error is discovered in a previously filed 13F, the manager must file a 13F-HR/A. There is no fixed deadline for amendments, but the SEC expects prompt correction. Failure to amend a materially incorrect filing can itself constitute a violation. Build an amendment review step into your post-filing workflow, not just your pre-filing checklist.

The small-position omission rule

Managers may omit individual positions with a fair market value below $200,000 and fewer than 10,000 shares, provided the omitted positions in aggregate do not exceed 0.5% of the total 13F portfolio, per the SEC's 13F FAQ. This is a practical relief provision that many smaller managers do not know exists. A good compliance workflow, or a tool that surfaces this rule, can meaningfully reduce the reporting burden.

Building a 13F Compliance Calendar Around the Tool

A deadline calculator gives you the regulatory date. A compliance calendar gives you the dates you actually need to hit. Here is a practical internal timeline working backward from the Q3 2026 deadline of November 16, 2026:

1. October 1, 2026: Quarter closes. Begin pulling position data from the portfolio management system.
2. October 15, 2026: Complete initial position reconciliation and CUSIP verification against the SEC's official 13(f) securities list.
3. October 30, 2026: Draft 13F-HR complete. Legal and compliance review begins. Assess any positions for confidential treatment eligibility.
4. November 7, 2026: Final review and sign-off. EDGAR test filing if the manager is filing for the first time or using a new filing agent.
5. November 13, 2026: File with EDGAR before 5:00 p.m. ET. Confirm receipt and EDGAR acceptance notice.
6. November 16, 2026: Regulatory deadline. Any filing submitted after 5:30 p.m. ET on this date receives a November 17 date stamp and is late.

For the full practitioner walkthrough of the filing process itself, see How to File Form 13F.

FAQ

What is the 13F filing deadline for Q3 2026? Monday, November 16, 2026. The 45th calendar day after September 30 is November 14, which falls on a Saturday, so the deadline rolls to the next business day.

What is the 13F filing deadline for Q4 2026? Tuesday, February 17, 2027. The 45th day is February 14, 2027 (Sunday). February 16 is Presidents' Day, so the deadline rolls to February 17.

Is the 45-day rule calendar days or business days? Calendar days. This is the most common mistake. Counting business days instead of calendar days will give you a date roughly three weeks later than the actual deadline.

What happens if I file at 6 p.m. ET on the deadline date? Your submission receives the next business day's filing date and is technically late. EDGAR's cutoff for same-day dating is 5:30 p.m. ET, per the EDGAR FAQ. Treat 5:00 p.m. ET as your operational deadline.

Can I get an extension for Form 13F? No. There is no Form 12b-25 equivalent for 13F. Missing the deadline is a violation regardless of circumstances.

Has the $100 million threshold changed? No. The SEC proposed raising it to $3.5 billion in 2020, which would have eliminated approximately 89% of filers. After more than 1,600 comment letters opposing the change, the proposal was withdrawn in 2023. The $100 million threshold remains in force.

What securities count toward the $100 million threshold? Exchange-listed equities, shares of closed-end investment companies, and certain convertible debt and equity options. U.S. Treasuries, municipal bonds, and most fixed-income instruments do not count. Use the SEC's official quarterly list of 13(f) securities to verify specific holdings.

Can I omit small positions from my 13F? Yes, if a position has a fair market value below $200,000 and fewer than 10,000 shares, and the total omitted positions do not exceed 0.5% of your 13F portfolio. This relief is available under the SEC's 13F FAQ but is widely overlooked by smaller managers.