Insider buying report — Monday, September 28, 2026: 44 open-market buys worth $49.6M
On Monday, September 28, 2026 the SEC published 44 open-market insider purchases worth $49.6M across 36 companies, against 19 insider sales of $1M or more worth $384.5M. By dollar value the selling outweighed the buying, which is the usual state of affairs — executives at large companies sell on schedule, and buy only on purpose.
The largest purchase
Conifer Management, L.L.C. (10% owner) at GROUP 1 AUTOMOTIVE INC (GPI) filed the day's largest purchase: 126,288 shares at $249.62, $31.5M in total, transacted on Sep 24, 2026 and filed Sep 28, 2026. What makes it notable: the stock was at least 25% below its recent high when they bought.
Behind it: Life Insurance Co Nippon at CRBG ($8.8M), John C Malone at LLYVK ($2.9M), Goldentree Asset Management Lp at QVCG ($1.1M).
Top ten insider buys
| Filed | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-28 | Conifer Management, L.L.C.dip 10% owner | GPI GROUP 1 AUTOMOTIVE INC | Bought | 126,288 | $249.62 | $31.5M |
| 2026-09-28 | Life Insurance Co Nippon 10% owner | CRBG Corebridge Financial, Inc. | Bought | 258,878 | $33.85 | $8.8M |
| 2026-09-28 | John C Malone 10% owner | LLYVK Liberty Live Holdings, Inc. | Bought | 28,333 | $102.53 | $2.9M |
| 2026-09-28 | Goldentree Asset Management Lp 10% owner | QVCG QVC Group, Inc. | Bought | 80,000 | $14.35 | $1.1M |
| 2026-09-28 | Lappe MarkclusterCEOdip Chief Executive Officer | INBX Inhibrx Biosciences, Inc. | Bought | 10,000 | $99.88 | $999k |
| 2026-09-28 | Edward A Mulefirst buydip Director · 10% owner | MSC STUDIO CITY INTERNATIONAL HOLDINGS Ltd | Bought | 1,157,000 | $0.85 | $978k |
| 2026-09-28 | Hartree Partners, LPdip 10% owner | HDSN HUDSON TECHNOLOGIES INC /NY | Bought | 118,549 | $5.10 | $604k |
| 2026-09-28 | John C Malonecluster 10% owner | LILA Liberty Latin America Ltd. | Bought | 22,442 | $20.44 | $459k |
| 2026-09-28 | Baetz Cary DCFOfirst buydip EVP and CFO | INR INFINITY NATURAL RESOURCES, INC. | Bought | 22,316 | $13.44 | $300k |
| 2026-09-28 | Fierman Michaelfirst buy Director · 10% owner | AOMR Angel Oak Mortgage REIT, Inc. | Bought | 38,726 | $7.50 | $291k |
Showing 10 of 44 open-market purchases filed on 2026-09-28. The full list, sortable and filterable by role and size, is in the members Filings Browser; the same rows are available as JSON through the API.
Signals in the day's buying
Of the purchases filed: 8 purchases by a chief executive (ANIX, CBDS, CTTH, DLPN, DMRA, FNWD); 3 by a CFO (ATCH, INR, PLAY); 16 that belong to an active cluster (AFCG, ANIX, ATCH, CFND, FNWD, GPUS); 20 first-ever purchases by the insider; 23 bought at least 25% below the recent high. These are the flags the members area scores on — a CFO buying with their own money has historically been the strongest single-insider signal, and a cluster of three or more buyers the strongest of all. The cluster guide explains the scoring.
GPI — two years of insider activity on the price
CRBG — two years of insider activity on the price
LLYVK — two years of insider activity on the price
Largest insider sales ($1M and up)
| Filed | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-28 | Sijbrandij Sytse Director | GTLB Gitlab Inc. | Sold | 2,116,200 | $47.77 | $101.1M |
| 2026-09-28 | Apax X (Guernsey) Usd Aiv Lp 10% owner | INNV InnovAge Holding Corp. | Sold | 10,000,000 | $9.25 | $92.5M |
| 2026-09-28 | Tco Group Holdings, L.P. 10% owner | INNV InnovAge Holding Corp. | Sold | 10,000,000 | $9.25 | $92.5M |
| 2026-09-28 | Lie Sean Chief Technology Officer | CBRS Cerebras Systems Inc. | Sold | 117,300 | $209.04 | $24.5M |
| 2026-09-28 | Zuckerberg Mark COB and CEO | META Meta Platforms, Inc. | Sold | 25,265 | $777.46 | $19.6M |
The largest sale was Sijbrandij Sytse at Gitlab Inc. (GTLB), $101.1M. Sales are shown from $1M upward only; below that they are overwhelmingly scheduled 10b5-1 plans and tax-driven, and listing them would bury the signal.
Context: the market-wide picture
For the week starting Sep 21, 2026, 33% of open-market insider filings across the whole market were buys (227 buys against 457 sales). The long-run average sits near a third, because insiders buy for one reason and sell for many. The full weekly series since 2019 is on the insider sentiment index.
Questions this post answers
Which insiders bought stock on Sep 28, 2026?
44 open-market purchases were filed with the SEC on Sep 28, 2026, worth $49.6M across 36 companies. The largest was Conifer Management, L.L.C. at GROUP 1 AUTOMOTIVE INC (GPI), $31.5M. The ten largest are listed above.
Were insiders net buyers or net sellers on Sep 28, 2026?
By dollar value, sellers: $49.6M bought against $384.5M in sales of $1M or more. Selling normally dominates because executives sell on pre-set schedules; what matters is the buying, which is voluntary.
What counts as an insider buy here?
Only Form 4 transactions with code P — an open-market purchase paid for with the insider's own money. Grants (A), option exercises (M) and shares withheld for tax (F) are excluded, because they follow vesting schedules set years earlier and say nothing about what the insider thinks of the price.
How current is this?
The SEC publishes Form 4 filings through about 10 pm Eastern each business day. This report covers everything published on Sep 28, 2026 and was generated early the next morning from the same data the members area uses.