Biggest insider buys, week of Oct 26–Nov 1, 2026: LeonaBio (LONA) leads with $9.9B
Insiders reported 261 purchases of common stock across 102 companies in SEC Form 4 filings. These are the five U.S. companies with the most insider buying by dollar value.
Industry: Biological Products, (No Diagnostic Substances). SEC ↗
One insider bought 3,149,470 shares in 1 transaction at an average of $3149.47 a share.
- Portman David J., 10% owner: bought 3,149,470 shares at $3149.47 ($9.92B) on Oct 26, 2026. Filed Oct 28, 2026. View Form 4 on SEC.gov ↗
Corebridge Financial, Inc. is an American financial services company. Wikipedia (CC BY-SA 4.0) ↗
One insider bought 1,448,902 shares in 6 transactions at an average of $34.66 a share.
- NIPPON LIFE INSURANCE CO, 10% owner: bought 411,516 shares at $33.74 ($13.88M) on Oct 23, 2026 under a 10b5-1 plan. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
- NIPPON LIFE INSURANCE CO, 10% owner: bought 245,898 shares at $35.26 ($8.67M) on Oct 28, 2026 under a 10b5-1 plan. Filed Oct 30, 2026. View Form 4 on SEC.gov ↗
- NIPPON LIFE INSURANCE CO, 10% owner: bought 246,440 shares at $35.15 ($8.66M) on Oct 22, 2026 under a 10b5-1 plan. Filed Oct 26, 2026. View Form 4 on SEC.gov ↗
All insider trades in CRBG →3 smaller transactions not listedIndustry: Biological Products, (No Diagnostic Substances). SEC ↗
One insider bought 2,070,444 shares in 11 transactions at an average of $18.50 a share.
- Venrock Healthcare Capital Partners III, L.P.; VHCP Co-Investment Holdings III, LLC; VHCP Management III, LLC; Venrock Healthcare Capital Partners EG, L.P.; VHCP Management EG, LLC; Venrock Healthcare Capital Partners XP, L.P.; VHCP Management XP, LLC; Koh Bong Y; Shah Nimish P, 10% owner: bought 1,944,444 shares at $18.00 ($35M) on Oct 26, 2026. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
- Venrock Healthcare Capital Partners III, L.P.; VHCP Co-Investment Holdings III, LLC; VHCP Management III, LLC; Venrock Healthcare Capital Partners EG, L.P.; VHCP Management EG, LLC; Venrock Healthcare Capital Partners XP, L.P.; VHCP Management XP, LLC; Koh Bong Y; Shah Nimish P, 10% owner: bought 31,067 shares at $26.84 ($833.84K) on Oct 27, 2026. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
- Venrock Healthcare Capital Partners III, L.P.; VHCP Co-Investment Holdings III, LLC; VHCP Management III, LLC; Venrock Healthcare Capital Partners EG, L.P.; VHCP Management EG, LLC; Venrock Healthcare Capital Partners XP, L.P.; VHCP Management XP, LLC; Koh Bong Y; Shah Nimish P, 10% owner: bought 28,379 shares at $26.11 ($740.98K) on Oct 23, 2026. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
All insider trades in LYCA →8 smaller transactions not listedIndustry: Wholesale-Industrial Machinery & Equipment. SEC ↗
One insider bought 250,000 shares in 3 transactions at an average of $115.94 a share.
- JACOBSON MITCHELL, Director: bought 134,662 shares at $116.00 ($15.62M) on Oct 23, 2026. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
- JACOBSON MITCHELL, Director: bought 60,951 shares at $115.11 ($7.02M) on Oct 23, 2026. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
- JACOBSON MITCHELL, Director: bought 54,387 shares at $116.72 ($6.35M) on Oct 23, 2026. Filed Oct 27, 2026. View Form 4 on SEC.gov ↗
Group 1 Automotive, Inc. is an international Fortune 300 automotive retailer with automotive dealerships and collision centers in the United States and the United Kingdom. Wikipedia (CC BY-SA 4.0) ↗
One insider bought 100,000 shares in 30 transactions at an average of $242.32 a share.
- Conifer Management, L.L.C., 10% owner: bought 18,920 shares at $242.77 ($4.59M) on Oct 22, 2026. Filed Oct 26, 2026. View Form 4 on SEC.gov ↗
- Conifer Management, L.L.C., 10% owner: bought 9,282 shares at $244.92 ($2.27M) on Oct 23, 2026. Filed Oct 26, 2026. View Form 4 on SEC.gov ↗
- Conifer Management, L.L.C., 10% owner: bought 9,501 shares at $236.02 ($2.24M) on Oct 22, 2026. Filed Oct 26, 2026. View Form 4 on SEC.gov ↗
All insider trades in GPI →27 smaller transactions not listed
How this report is made
This report is compiled automatically from SEC Form 4 filings received during the week shown. Companies are ranked by the total dollar value of insider purchases (transaction code P, open-market or private purchase). “Insiders” include officers, directors and owners of more than 10% of a company, which can be investment funds. Only common stock is counted: preferred shares, units and derivatives are left out, as are filings that fail our data checks. When a fund and the insider who controls it both report the same trade, it is counted once. Only U.S.-based companies are ranked, because insiders of foreign companies sometimes report prices in their local currency.
Every figure comes from the original filing, which is linked in each entry; the filing is the authoritative record. This is information, not investment advice. See the methodology, disclaimer and corrections policy.