Below are some of the most frequently asked questions by users of whalewisdom. If you have any questions that aren't answered here, please contact us.


What is a 13F?

Form 13F is a filing that all institutional investors who manage over $100 million in assets must submit to the SEC no later than 45 days after the end of the March, June, September, and December quarters. The 13F is essentially a list of holdings that large investors own.
Individual activists or "whales" are also required to file Form 13F. These include successful investors such as Warren Buffett (see Berkshire Hathaway), T Boone Pickens (see BP Capital), Carl Icahn, and Eddie Lampert (see RBS Partners). By comparing current holdings with previous quarters, one may infer which stocks are being bought and sold by the "whales".

When are filings due?

13F filers aren't required to file until 45 days after the end of the quarter. If this falls on a weekend then filings are due the following Monday. While they can obviously file early, most filers tend to wait until the last minute to submit their filing. Of course there are always stragglers that don't file for days or even weeks after that.

What kind of assets must be reported on Form 13F?

Any asset that is considered a 13F asset by the SEC must be reported on Form 13F. The official list can be found at Basically anything that is traded on an exchange as well as certain equity options and warrants, shares of closed-end investment companies and certain convertible debt securities.

Why can't I find my favorite mutual fund?

The shares of open-end investment companies (i.e., mutual funds) are not Section 13(f) securities. Mutual funds and ETFs file a different filing with the SEC, N-PORT. WhaleWisdom also has data for these filings listed separately from 13F holdings.

I found an error in one of your filings. What gives?

Please remember that the import process is not perfect. It is entirely automated and done in real-time. So within minutes of the SEC releasing a filing, WhaleWisdom imports and displays it. The risk with providing real-time access such as this is that the filing may contain mistakes or the import process incorrectly parses the filing. If you have doubts about the validity of certain filings then please check with the actual SEC filing. Links are provided back to every 13F filing used by the site. And if you find an error, please report it to us so we may correct it for others.

How up-to-date are the filings on WhaleWisdom?

WhaleWisdom checks with the SEC every few minutes to see if any new 13F filings have been posted. As soon as any are found they are automatically processed and released. You can see the latest filings by clicking here

How far back does the WhaleWisdom database go?

The database goes back to the March 31, 2001 quarter. Only the last 9 quarters are available for free to everyone. Please contact us for pricing information to gain access to earlier time periods.

What do the designations PRN, CALL and PUT mean?

These are to segregate holdings by class. PRN indicates principal amount on convertible debt securities. If the holdings being reported are put or call options, then the designation "PUT" or "CALL" is used as appropriate.

Why don't stock prices in backtester match the securities actual closing price?

Prices used in backtests are the "total returns" price for the end of day. The total returns price includes dividends, spinoffs, and other adjustments so it likely won't match the actual closing price for the stock.

What is "Estimated Avg Price Paid"? How is it determined?

Estimated Avg Price uses the average stock price during the quarter to determine the average price paid. It also takes into account past quarterly 13F transactions and adjusts with the funds buying/selling over time. It's just a guesstimate since the fund could have purchased the position at any time during the quarter.

The quarter ended 2-weeks ago, why hasn't the Heat Map/WhaleIndex/Stats page been updated yet?

The Heat Map/WhaleIndex/13F statistics pages are not updated until 1-2 days AFTER the 13F filing deadline. The deadline for 13F's is 45-days after the end of the quarter.

What is the difference between 13F and N-PORT Filings?

13F filings are filed quarterly by any investment manager exercising investment discretion over at least $100 million in long US securities.

N-PORT filings are filed by all registered investment companies (mutual funds, closed-end funds) and exchange-traded funds (ETFs). N-PORT filings are filed monthly with the SEC, but only the quarterly N-PORT is made available to the public.

Some key differences:

  • 13Fs include long US securities only. N-PORT filings on the other hand disclose the entire portfolio, including cash, shorts, foreign securities, treasuries and more.
  • 13Fs are slightly more timely as filings are due 45-days after the calendar quarter end date. N-PORT filings are due 60-days after the fiscal quarter end date.
  • 13F filers will include any investment manager, not just mutual fund and ETF managers, as long as they meet the $100M threshold. So qualifying hedge funds and even sovereign wealth funds must file a 13F.
  • 13F filings are filed at the company level whereas N-PORTs are filed at the fund level. So for a manager with many different funds, it isn't possible to tell which individual fund the position is allocated to with 13Fs.

WhaleWisdom processes both 13F and N-PORT filings. When you view a stock on the site, N-PORT disclosures are separated from 13F disclosures to prevent double-counting since many entities must file both. We have all 13F filings since 2001 and N-PORT filings since 2019.