13F filings by quarter, with every deadline

45 days after the end of each calendar quarter: around February 14, May 15, August 14 and November 14. When that day falls on a weekend or a federal holiday, the deadline moves to the next business day, so the date shifts by a day or two from year to year.

An institutional investment manager with discretion over $100 million or more in 13(f) securities, which are mostly US-listed stocks plus some options and convertibles. The filing lists long positions only: no short positions and no cash.

Filings arrive over the 45 days after a quarter ends, and many managers file in the last few days. A quarter's page goes up the day after the quarter ends and fills in as each tracked manager files; until the deadline every count on it is a count so far.

Yes. Late filings and amendments keep arriving for weeks after a deadline, so a quarter's figures can still change after it has passed.