https://wallstpal.com/guides/Plain-English guides to SEC filings, insider trading, 13F holdings and investing basics. en-usWed, 28 Oct 2026 21:00:00 GMT360 https://wallstpal.com/brand/icon-144.pnghttps://wallstpal.com/guides/ https://wallstpal.com/guides/what-is-a-13f-filing/guide-what-is-a-13f-filingWed, 28 Oct 2026 21:00:00 GMTGuideA 13F is the quarterly list of U.S. stock holdings that every large investment manager files with the SEC. Here is who files one, what is in it, when it comes out, and how to use it. https://wallstpal.com/guides/how-to-read-a-13f/guide-how-to-read-a-13fWed, 28 Oct 2026 21:00:00 GMTGuideA walk through every column of a 13F information table: issuer, class, CUSIP, value, shares, put/call, discretion and voting. Plus the three mistakes people make most often. https://wallstpal.com/guides/how-to-read-form-4/guide-how-to-read-form-4Wed, 28 Oct 2026 21:00:00 GMTGuideA Form 4 shows when a company insider bought or sold stock, how much, at what price, and how many shares they hold afterwards. Here is how to read one, box by box. https://wallstpal.com/guides/what-a-13f-cant-tell-you/guide-what-a-13f-cant-tell-youWed, 28 Oct 2026 21:00:00 GMTGuideA 13F lists a fund's U.S. stock holdings at the end of each quarter. It is useful, but it is late, partial and silent about why. Here is what to keep in mind before copying anyone. https://wallstpal.com/guides/13f-filing-deadline/guide-13f-filing-deadlineWed, 28 Oct 2026 21:00:00 GMTGuideA 13F is due 45 days after each quarter ends, moved to the next business day if that falls on a weekend or holiday. Here are the next four deadlines and what to expect around them. https://wallstpal.com/guides/10b5-1-trading-plans/guide-10b5-1-trading-plansWed, 28 Oct 2026 21:00:00 GMTGuideMany insider sales are scheduled months in advance under a Rule 10b5-1 plan. Here is how these plans work, what the 2023 rule changes require, and how to read a plan sale. https://wallstpal.com/guides/is-insider-buying-a-good-signal/guide-is-insider-buying-a-good-signalWed, 28 Oct 2026 21:00:00 GMTGuideStudies going back decades find that open-market purchases by insiders have, on average, been followed by better-than-market returns. Here is what the research found, where it falls short, and how to use it. https://wallstpal.com/guides/what-is-a-cluster-buy/guide-what-is-a-cluster-buyWed, 28 Oct 2026 21:00:00 GMTGuideA cluster buy is when several insiders at the same company buy shares around the same time. Here is why investors watch for them and how WallStPal finds them. https://wallstpal.com/guides/follow-berkshire-hathaway-portfolio/guide-follow-berkshire-hathaway-portfolioWed, 28 Oct 2026 21:00:00 GMTGuideBerkshire Hathaway lists its U.S. stock holdings in a 13F filing each quarter. Here is when it comes out, how to read it, and why copying it trade for trade is harder than it looks. https://wallstpal.com/guides/form-4-transaction-codes/guide-form-4-transaction-codesWed, 28 Oct 2026 21:00:00 GMTGuideEvery row on a Form 4 has a one-letter code. P means an open-market purchase and S means a sale, but most rows use other codes. Here is what each one means and which ones matter. https://wallstpal.com/guides/13f-hr-vs-13f-nt-amendments/guide-13f-hr-vs-13f-nt-amendmentsWed, 28 Oct 2026 21:00:00 GMTGuideNot every 13F lists holdings. Some are notices pointing to another filer, and many are amendments filed weeks later. Here is how to tell them apart on EDGAR. https://wallstpal.com/guides/form-4-vs-13f/guide-form-4-vs-13fWed, 28 Oct 2026 21:00:00 GMTGuideForm 4 shows trades by company insiders within two business days. A 13F shows a fund's holdings once a quarter, weeks later. Here is how the two differ and when one big investor files both. https://wallstpal.com/guides/fund-concentration-13f/guide-fund-concentration-13fWed, 28 Oct 2026 21:00:00 GMTGuideSome funds put most of their money in ten stocks. Others spread it over thousands. The share held by the top 10 positions tells you how to read a fund's 13F, and whether copying it makes sense.