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SEC Form 4 · updated hourly

What are the biggest insider stock buys this week?

Between Oct 4, 2026 and Oct 11, 2026, corporate insiders at the US companies in Flock's Form 4 coverage disclosed 264 purchase rows of their own companies' stock (transaction code P — open-market or private buys) — the largest being BERKSHIRE HATHAWAY INC's $67.5M purchase of LENNAR CORP /NEW/, filed Oct 5, 2026. Ranked by disclosed value (shares × the filing's stated price). Purchase transactions only — grants, exercises and tax withholdings are excluded.

The 20 largest disclosed insider buys

#InsiderCompanyValueTrade dateFiled
1BERKSHIRE HATHAWAY INCLENNAR CORP /NEW/$67.5MOct 2, 2026Oct 5, 2026
2BERKSHIRE HATHAWAY INCLENNAR CORP /NEW/$35.1MOct 2, 2026Oct 5, 2026
3BERKSHIRE HATHAWAY INCLENNAR CORP /NEW/$33.9MOct 1, 2026Oct 5, 2026
4BERKSHIRE HATHAWAY INCLENNAR CORP /NEW/$27.1MOct 2, 2026Oct 5, 2026
5Yin Chung-YaoGogoro Inc.$26.5MOct 7, 2026Oct 9, 2026
6NIPPON LIFE INSURANCE COCorebridge Financial, Inc.$20.9MOct 7, 2026Oct 9, 2026
7BERKSHIRE HATHAWAY INCLENNAR CORP /NEW/$15.2MOct 1, 2026Oct 5, 2026
8Huang Jack Jiajia51Talk Online Education Group$14.1MSep 25, 2026Oct 8, 2026
9Huang Jack Jiajia51Talk Online Education Group$10.3MSep 23, 2026Oct 8, 2026
10Yin Chung-YaoGogoro Inc.$8.6MOct 7, 2026Oct 9, 2026
11BERKSHIRE HATHAWAY INCLENNAR CORP /NEW/$7.5MOct 1, 2026Oct 5, 2026
12NIPPON LIFE INSURANCE COCorebridge Financial, Inc.$6.4MOct 2, 2026Oct 6, 2026
13Troim Tor OlavBorr Drilling Ltd$6.4MOct 6, 2026Oct 7, 2026
14Troim Tor OlavBorr Drilling Ltd$6.2MOct 5, 2026Oct 6, 2026
15Troim Tor OlavBorr Drilling Ltd$5.4MOct 7, 2026Oct 8, 2026
16NIPPON LIFE INSURANCE COCorebridge Financial, Inc.$5.0MOct 1, 2026Oct 5, 2026
17L1 Capital Pty LtdAnteris Technologies Global Corp.$4.9MOct 5, 2026Oct 6, 2026
18Huang Jack Jiajia51Talk Online Education Group$4.4MSep 22, 2026Oct 8, 2026
19NIPPON LIFE INSURANCE COCorebridge Financial, Inc.$4.1MOct 6, 2026Oct 8, 2026
20NIPPON LIFE INSURANCE COCorebridge Financial, Inc.$4.0MOct 1, 2026Oct 5, 2026

Showing the 20 largest of 263 rankable purchase rows in the window, ranked by disclosed value (shares × the filing's stated price). 1 purchase row in the window states no price or share count and cannot be ranked. Source: SEC EDGAR Form 4 filings.

Disclosures shown are public regulatory filings. Data may be delayed or incomplete. Smart-money entities may no longer hold positions shown. Not investment advice.

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Frequently asked questions

What was the biggest insider buy this week?

Among the US companies in Flock's Form 4 coverage, the largest insider purchase transaction (code P) disclosed between Oct 4, 2026 and Oct 11, 2026 was BERKSHIRE HATHAWAY INC's $67.5M purchase of LENNAR CORP /NEW/, filed with the SEC on Oct 5, 2026. Ranked by disclosed value — shares times the filing's stated price. Not investment advice.

What counts as an insider buy here?

Only purchase transactions — SEC Form 4 code P, which covers open-market and private purchases. Grants, option exercises, and tax-withholding acquisitions are excluded: an insider receiving stock is a different fact from an insider spending their own money to buy it. Superseded filings (replaced by amendments) are also excluded.

Does this cover every US company?

No. Flock ingests Form 4 filings for the US issuers in its coverage scope — the securities mapped from institutional 13F holdings — not every SEC registrant. A purchase at a company outside that scope will not appear here; the counts and the largest-buy answer are claims about Flock's coverage, stated as such.

How fresh is this list?

Form 4 filings are due within two business days of the trade. This page re-computes hourly over a rolling 7-day window (currently Oct 4, 2026 to Oct 11, 2026) from Flock's daily SEC EDGAR ingestion.

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