Missing a Form 13F deadline isn’t just an administrative inconvenience — it can trigger SEC enforcement action, result in financial penalties, and create compliance record issues that follow your firm for years. With four quarterly filing windows each year, staying on top of the calendar is one of the simplest things an institutional investment manager can do to protect itself.
The 45-Day Rule Explained
Form 13F must be filed within 45 calendar days after the close of each calendar quarter. The filing reflects holdings as of the last trading day of the quarter — not holdings at the time of filing. This distinction matters: you’re always reporting a snapshot in time, even if those positions have since changed. When the 45-day deadline falls on a Saturday, Sunday, or federal holiday, the SEC permits filing on the next business day.
2026 Filing Deadlines
Q1 2026 (January 1 – March 31): Holdings as of March 31, 2026. Filing deadline: May 15, 2026.
Q2 2026 (April 1 – June 30): Holdings as of June 30, 2026. Filing deadline: August 14, 2026.
Q3 2026 (July 1 – September 30): Holdings as of September 30, 2026. Filing deadline: November 14, 2026.
Q4 2026 (October 1 – December 31): Holdings as of December 31, 2026. Filing deadline: February 14, 2027.
Your Internal Preparation Timeline
The 45-day window sounds generous — until you account for the time needed to gather custodian data, cross-reference the SEC securities list, resolve CUSIP discrepancies, build the XML, validate it, and upload through EDGAR. Firms that start preparation in week five routinely encounter last-minute errors with no buffer to fix them.
Here’s the preparation timeline we recommend to our clients. In Week 1, pull holdings data from all custodians and confirm that all accounts are represented. In Week 2, cross-reference against the SEC 13F securities list, flagging any securities that don’t appear on the current list. In Week 3, address CUSIP formatting issues, round market values, confirm discretion and voting classifications, and generate the XML. In Week 4, validate the XML against the SEC’s schema and conduct a compliance review. In Weeks 5–6, submit via EDGAR with a buffer before the hard deadline — filing 7–14 days early gives you time to address any EDGAR rejection without missing the compliance window.
What If You Need to Amend a Filing?
If you discover an error after submission, you can file a 13F/A amendment at any time. Amendments follow the same XML format requirements as the original filing. You should file an amendment as promptly as possible after discovering an error, and document your discovery and correction timeline internally in case the SEC ever inquires.
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