13F Filing Deadlines: When Do Institutional Holdings Become Public?

If you follow institutional investors through Form 13F, one date matters as much as the holdings themselves:

When did the filing become public?

A 13F does not show a manager's live portfolio.

It shows certain reportable holdings as of a calendar quarter-end, and the filing can arrive weeks later.

For investors, that creates two different dates:

Holdings date
≠
Filing date

For example, a Q3 2026 Form 13F reports holdings as of:

September 30, 2026

but the SEC's filing deadline for that quarter is:

November 16, 2026

So a filing released near the deadline may describe positions that are more than six weeks old.

That time lag is not a minor technical detail. It is one of the most important things to understand before using 13F data.

For managers subject to Form 13F reporting, filings are generally due within 45 days after the end of the relevant calendar quarter.

The reporting dates are based on calendar quarters:

Q1: March 31
Q2: June 30
Q3: September 30
Q4: December 31

The practical pattern is therefore:

Q1 holdings
→ filed around mid-May

Q2 holdings
→ filed around mid-August

Q3 holdings
→ filed around mid-November

Q4 holdings
→ filed around mid-February

If the normal deadline falls on a Saturday, Sunday, or applicable holiday, the deadline moves to the next business day.

For 2026 quarter-ends, the SEC lists these deadlines:

As of October 23, 2026, the next major 13F deadline is therefore:

November 16, 2026, for holdings reported as of September 30, 2026.

Managers do not have to wait until the deadline. Some file earlier.

That is why institutional holdings begin appearing gradually before the final date, then often accelerate as the deadline approaches.

The SEC has also published the following dates:

The exact calendar date can shift when the normal deadline falls on a weekend or holiday.

The underlying rule remains more important than memorizing any one date:

Form 13F is generally due within 45 days after the relevant calendar quarter-end.

Forty-five days after September 30, 2026 lands on:

November 14, 2026

But November 14 is a Saturday.

Under the SEC's deadline rules, when the due date falls on a Saturday, Sunday, or holiday, the filing is due on the next business day.

That moves the Q3 2026 deadline to:

Monday, November 16, 2026

This is why simply adding 45 calendar days can occasionally give you a date that differs from the official filing deadline.

For current deadlines, the SEC calendar should take priority over a hand calculation.

The same principle affects the December quarter.

The basic 45-day date after December 31, 2026 falls around mid-February 2027.

The SEC lists the official Q4 2026 deadline as:

Tuesday, February 16, 2027

Calendar effects matter because weekends and federal holidays can shift the actual deadline.

For recurring research workflows, it is better to use the official SEC deadline than assume every quarter ends with the same fixed date.

The deadline is the latest date a timely filer can submit.

It is not a scheduled release date for the entire market.

Managers can submit earlier.

That means a typical 13F season looks more like:

Quarter ends
↓
Some early filers appear
↓
More filings arrive
↓
Large wave near deadline
↓
Deadline day

This has an important consequence.

If you check institutional holdings too early, the data set may be incomplete.

A stock may appear to have:

10 tracked institutional holders

and then show:

25 tracked holders

several days later simply because more managers have filed.

That is not the same thing as 15 managers buying the stock during those few days.

It may only reflect filing availability.

Investors sometimes treat 13F deadline day as if every institution publishes simultaneously.

That is not how the data arrives.

For a stock-level institutional ownership view, there are really three states:

Early Filing Window

Only part of the relevant manager universe has filed.

The data is useful but incomplete.

Near Deadline

Coverage becomes much more representative as more filings arrive.

Post-Deadline

Most timely filings that should be available for that reporting cycle are now public, although amendments, late filings, and confidential-treatment effects can still change the record.

For a platform such as the BasisPilot 13F Holdings Tracker, this means a quarter-over-quarter view can become progressively more complete as filing season advances.

A Form 13F is filed electronically through the SEC's EDGAR system.

For ordinary public filings, investors can access the filing after it is submitted and disseminated through EDGAR.

So there is no need to wait until the quarter's final deadline if a manager files earlier.

This makes the filing date important in its own right.

Two managers can both report holdings for:

September 30

while one files on:

October 28

and another on:

November 16

The underlying holdings date is the same.

The public availability date is not.

This distinction should be visible in every serious 13F analysis.

Suppose:

Holdings date:
September 30

Filing date:
November 14

The correct interpretation is:

The filing became public in November, but the reported positions describe September 30.

Do not write:

The manager bought the stock in November.

The filing date tells you when the information became public.

It does not tell you when the manager executed the trade.

The maximum normal filing lag is roughly 45 days from quarter-end.

But the economic information can be older than that.

Suppose a manager bought a stock on:

July 3

and still owned it at:

September 30

Then filed on:

November 16

By the time the public sees the position, the original purchase could be more than four months old.

A 13F usually cannot tell you the exact trade date.

That is why the age of the position decision can be longer than the age of the quarter-end snapshot.

Imagine a manager builds a position during Q3.

July 15:
Begins buying

August:
Adds shares

September 30:
Quarter-end reported holding = 2 million shares

October:
Manager may continue trading

November 16:
13F deadline

When the filing appears, investors can learn:

2 million shares were reported as of September 30

They cannot conclude:

The manager still owns exactly 2 million shares on November 16

The position may already have changed.

This is the core reason 13F data works better for historical portfolio research than real-time trade copying.

The delay is a limitation.

It does not make the data irrelevant.

13F filings are still useful for identifying:

• long-term portfolio concentration;
• multi-quarter accumulation;
• multi-quarter reductions;
• new reported positions;
• reported exits;
• changes in manager conviction proxies;
• institutional ownership patterns;
• which stocks appear across multiple tracked managers.

The value comes from studying patterns, not pretending the data is live.

For example:

Q1: 1.0M shares
Q2: 1.6M shares
Q3: 2.4M shares

is a meaningful historical accumulation pattern even if the Q3 number became public several weeks after quarter-end.

A filing-day headline might say:

Fund X increased Stock Y by 50%.

That is useful.

But compare two histories.

Manager A

Q1: 0.5M
Q2: 1.0M
Q3: 1.5M
Q4: 2.0M

Manager B

Q1: 2.0M
Q2: 3.0M
Q3: 1.5M
Q4: 2.0M

Both may show a similar quarter-over-quarter increase in one period.

But the broader patterns are different.

Manager A shows sustained accumulation.

Manager B shows a more variable position.

That is why filing deadlines are best understood as data refresh events, not automatic buy or sell signals.

The SEC's Form 13F FAQ states that the SEC does not grant ordinary extensions for missed 13F deadlines.

A manager that misses the deadline should file as soon as possible.

For investors, a late filing creates another reason not to treat a filing screen as a perfectly synchronized snapshot of the institutional universe.

If one manager is absent near the deadline, possible explanations include:

• it has not filed yet;
• the filing is late;
• the manager is not required to file for that period;
• holdings are reported through another manager;
• confidential treatment affects public availability;
• the entity structure has changed.

Do not immediately interpret absence as a portfolio exit.

Some institutional managers can request confidential treatment for certain information under SEC procedures.

If granted, some holdings may not become public at the same time as the rest of the filing.

This matters because a public 13F may not always reveal every reportable position simultaneously.

Later disclosure or amendments can change what investors see historically.

For ordinary investors, the practical lesson is:

A missing position is not always proof that the manager did not own it.

This is one reason exact historical reconstruction sometimes requires reviewing later amendments and confidential-treatment releases.

You may see:

13F-HR

followed later by:

13F-HR/A

The /A indicates an amended filing.

An amendment can:

• correct data;
• add information;
• revise entries;
• change a prior filing.

If you are building quarter-over-quarter data, the amendment may need to replace or modify the original record.

Otherwise, you can create a false comparison.

For a deeper filing-reading workflow, see How to Read a 13F Filing.

The rule is more specific than:

Any fund with more than $100 million must file.

Under the SEC framework, institutional investment managers that exercise investment discretion over at least $100 million in Section 13(f) securities under the applicable threshold test can become subject to Form 13F reporting.

The threshold is tied to:

Section 13(f) securities

not necessarily the manager's entire assets under management.

That means:

13F reported portfolio value
≠ total AUM

For a full introduction to what 13F includes and excludes, see What Is a 13F Filing?.

The filing obligation is not simply:

Cross $100 million today, file the current quarter immediately.

The SEC explains that if a manager first meets the applicable $100 million threshold during a calendar year, the first required filing is generally for the December quarter of that year.

The manager then files the March, June, and September quarter reports in the following calendar year.

This is an important detail when studying a newly visible manager.

A manager can exist and manage substantial capital before it first appears in a 13F data set.

Its first appearance does not necessarily mean:

The manager was newly created

or:

The positions were all newly purchased

It may simply be the first period in which a public Form 13F filing was required.

If a manager is missing from a new reporting cycle, do not immediately conclude:

The fund closed.

Possible explanations include:

• filing timing;
• reporting through another manager;
• legal-entity changes;
• filing obligations changing in a later year;
• data ingestion delays;
• amendments;
• confidential treatment;
• manager-name normalization issues.

Always verify the filing record before drawing a portfolio conclusion.

There are two useful approaches.

Approach 1: Follow Filings as They Arrive

Useful if you care about:

• specific managers;
• notable early filings;
• major new positions;
• headline portfolio changes.

The advantage is speed.

The disadvantage is incomplete cross-manager coverage.

Approach 2: Review After the Deadline

Better if you want:

• a broad stock-level institutional comparison;
• manager rankings;
• cross-manager accumulation;
• ownership breadth;
• quarter-over-quarter cohort analysis.

Waiting until most timely filings have arrived produces a cleaner cross-sectional data set.

Neither approach is always better.

They answer different research questions.

A practical quarterly process can look like this.

At Quarter-End

Record the snapshot date:

March 31
June 30
September 30
December 31

During the Following 45 Days

Watch for early manager filings.

Use them for manager-specific research, but do not assume the full institutional data set is complete.

Near the Deadline

Expect filing volume to increase.

Begin comparing:

• new positions;
• additions;
• reductions;
• exits;
• top holdings;
• stock-level institutional activity.

After the Deadline

Run the more complete quarter-over-quarter review.

This is the best point for broader questions such as:

Which stocks saw the most tracked managers add shares?

or:

Which names saw broad institutional reductions?

The BasisPilot 13F Holdings Tracker is designed around this manager-and-stock comparison workflow.

If you do not want to memorize exact dates, remember:

March quarter
→ mid-May

June quarter
→ mid-August

September quarter
→ mid-November

December quarter
→ mid-February

Then verify the exact date because:

Weekend / holiday
→ next business day

For current research, the official SEC calendar should always override a rough estimate.

No.

The deadline is a deadline, not a synchronized publication schedule.

Some managers file early.

Others file near the final day.

That means two important things.

Do Not Compare Incomplete Coverage as if It Were Final

If only 60% of your tracked manager universe has filed, stock-level holder counts are not final.

Do Not Treat Filing Date as Trade Date

A manager filing earlier than another manager does not mean the first manager traded earlier.

Both filings may describe the same quarter-end date.

The filing calendar itself is public and predictable.

But the holdings are not known until the filings become public.

Trying to trade purely because:

13F deadline is next week

does not create a fundamental edge by itself.

What can be useful is preparing a research process:

• define managers you care about;
• define stocks you want to monitor;
• capture prior-quarter holdings;
• compare new filings consistently;
• separate share changes from market-value changes;
• avoid calling delayed holdings "current."

The advantage comes from better interpretation, not from knowing the deadline exists.

Suppose you want to know what a manager owned during Q3 2026.

Step 1: Reporting Date

September 30, 2026

Step 2: Deadline

Official SEC deadline:

November 16, 2026

Step 3: Manager Files

Suppose the manager submits on:

November 12, 2026

Step 4: Correct Interpretation

You can say:

The manager's Q3 2026 filing, submitted November 12, reports the position as of September 30.

Step 5: Incorrect Interpretation

Do not say:

The manager bought the stock on November 12.

The filing date is a disclosure date.

It is not the transaction date.

Mistake 1: Treating the Deadline as the Holdings Date

The quarter-end date is the holdings date.

The deadline comes later.

Mistake 2: Assuming All Managers File on Deadline Day

Many file earlier.

Mistake 3: Assuming a Filing Reveals Today's Portfolio

The position may have changed after quarter-end.

Mistake 4: Assuming an Early Filing Is More Current

An early filing and a deadline-day filing for the same quarter describe the same quarter-end snapshot.

Mistake 5: Calling a New 13F Position a Recent Purchase

The exact purchase date is generally unknown from the filing.

Mistake 6: Treating a Missing Manager as an Exit

The manager may simply not have filed yet or may be reported differently.

Mistake 7: Ignoring Amendments

Historical data can change after the original filing.

Mistake 8: Ignoring Confidential Treatment

Not every position must necessarily become public at the same time.

Mistake 9: Assuming 45 Days Always Produces the Official Calendar Date

Weekends and holidays can shift the deadline.

Mistake 10: Treating 13F Data as Useless Because It Is Delayed

The delay limits real-time use, but multi-quarter portfolio trends remain valuable.

Before using a new quarter's 13F data, check:

• What is the quarter-end holdings date?
• What is the official SEC filing deadline?
• Has this manager already filed?
• What is the actual filing date?
• Is this an original filing or amendment?
• Is the filing public through EDGAR?
• Is the manager universe fully filed yet?
• Could another manager be reporting on this manager's behalf?
• Could confidential treatment affect the visible holdings?
• Am I comparing the same legal manager across quarters?
• Am I calling the filing date a trade date by mistake?
• Am I treating a quarter-end position as current?
• Is a stock-level holder count still incomplete because filing season is ongoing?
• Have I compared multiple quarters rather than one deadline-day headline?

That checklist prevents most of the common timing errors in 13F research.

When are 13F filings due?

Form 13F filings are generally due within 45 days after the relevant calendar quarter-end, subject to weekend and holiday adjustments.

What are the four 13F reporting dates?

The calendar quarter-ends are:

March 31
June 30
September 30
December 31

When is the Q3 2026 13F deadline?

The SEC lists the Q3 2026 deadline as:

November 16, 2026

The holdings are reported as of:

September 30, 2026

Why is the Q3 2026 deadline November 16 instead of November 14?

November 14, 2026 is a Saturday, so the deadline moves to the next business day.

When is the Q4 2026 13F deadline?

The SEC lists:

February 16, 2027

for the quarter ended December 31, 2026.

Do all funds file 13F on the same day?

No.

Managers can file before the deadline, so filings appear gradually throughout the filing window.

How delayed is 13F data?

A timely filing can be submitted as late as roughly 45 days after quarter-end.

The underlying investment decision may be even older because the filing does not disclose the exact trade date.

Does the 13F filing date show when the stock was purchased?

No.

The filing date is when the disclosure was submitted, not the trade date.

Are 13F filings public?

Public Form 13F filings are submitted electronically through EDGAR and become available to investors through the SEC's filing system, subject to matters such as confidential treatment.

Can a 13F filing change after it is published?

Yes.

A manager can file an amendment, such as a 13F-HR/A, that modifies an earlier report.

Is 13F data too delayed to be useful?

It is too delayed to treat as a live portfolio feed.

It can still be very useful for studying multi-quarter institutional holdings, concentration, accumulation, reductions, and reported exits.

The most important 13F timing relationship is:

Quarter-end holdings date
→ up to roughly 45 days
→ public filing deadline

Those dates answer different questions.

The quarter-end date tells you:

When does this holdings snapshot apply?

The filing date tells you:

When did investors get to see it?

Never confuse the two.

For Q3 2026:

Holdings date:
September 30, 2026

Official deadline:
November 16, 2026

The gap is exactly why 13F data should be used as a historical institutional-research tool rather than a real-time trade feed.

Use the BasisPilot 13F Holdings Tracker to compare managers, stocks, and quarter-over-quarter reported changes, and keep the filing timeline visible whenever you interpret the data.