Insider buying report — Wednesday, September 23, 2026: 39 open-market buys worth $75.1M
On Wednesday, September 23, 2026 the SEC published 39 open-market insider purchases worth $75.1M across 37 companies, against 34 insider sales of $1M or more worth $242.4M. 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
Orbimed Advisors Llc (director · 10% owner) at Electra Therapeutics, Inc. (ETRA) filed the day's largest purchase: 1,333,333 shares at $15.00, $20.0M in total, transacted on Sep 21, 2026 and filed Sep 23, 2026.
Behind it: Carl L Gordon at ETRA ($20.0M), Eliyahou Et Al Harari at CV ($10.0M), Life Insurance Co Nippon at CRBG ($7.5M).
Top ten insider buys
| Filed | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-23 | Orbimed Advisors Llc Director · 10% owner | ETRA Electra Therapeutics, Inc. | Bought | 1,333,333 | $15.00 | $20.0M |
| 2026-09-23 | Carl L Gordonlargest ever Director · 10% owner | ETRA Electra Therapeutics, Inc. | Bought | 1,333,333 | $15.00 | $20.0M |
| 2026-09-23 | Eliyahou Et Al Hararidiplargest ever 10% owner | CV CapsoVision, Inc | Bought | 1,757,469 | $5.69 | $10.0M |
| 2026-09-23 | Life Insurance Co Nippon 10% owner | CRBG Corebridge Financial, Inc. | Bought | 212,828 | $35.08 | $7.5M |
| 2026-09-23 | Nesbitt Stephen Lanelargest ever President | CRAFX Cascade Real Assets Fund | Bought | 500,000 | $10.00 | $5.0M |
| 2026-09-23 | Shen Ching Hangdiplargest ever 10% owner | CV CapsoVision, Inc | Bought | 878,734 | $5.69 | $5.0M |
| 2026-09-23 | Bartholdson John A.first buydip 10% owner | OFIX Orthofix Medical Inc. | Bought | 310,000 | $8.81 | $2.7M |
| 2026-09-23 | James L Robo Director | KBDC Kayne Anderson BDC, Inc. | Bought | 114,961 | $13.09 | $1.5M |
| 2026-09-23 | Batista de Lima Filho Pedro Director | AXIA3 AXIA Energia S.A. | Bought | 91,000 | $10.55 | $960k |
| 2026-09-23 | Kayyem Jon Faizclusterdip Director | INBX Inhibrx Biosciences, Inc. | Bought | 5,000 | $100.00 | $500k |
Showing 10 of 39 open-market purchases filed on 2026-09-23. 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: 6 purchases by a chief executive (BCDA, DUOT, GOAI, PHIO, RCT, SKIL); 1 by a CFO (LUCK); 8 that belong to an active cluster (ADC, AIAI, ALP, GAM, INBX, LUCK); 14 first-ever purchases by the insider; 26 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.
CV — two years of insider activity on the price
CRBG — two years of insider activity on the price
OFIX — two years of insider activity on the price
Largest insider sales ($1M and up)
| Filed | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-23 | Troendle August J. President & CEO | MEDP Medpace Holdings, Inc. | Sold | 70,901 | $626.62 | $44.4M |
| 2026-09-23 | Sousa Mauad Bruno Director | AUGO Aura Minerals Inc. | Sold | 816,000 | $42.53 | $34.7M |
| 2026-09-23 | Tenev Vladimir Chief Executive Officer | HOOD Robinhood Markets, Inc. | Sold | 259,166 | $125.58 | $32.5M |
| 2026-09-23 | Cox Christopher K Chief Product Officer | META Meta Platforms, Inc. | Sold | 40,000 | $712.76 | $28.5M |
| 2026-09-23 | Shan Yigang Executive Director | BEKE KE Holdings Inc. | Sold | 3,326,670 | $5.44 | $18.1M |
The largest sale was Troendle August J. at Medpace Holdings, Inc. (MEDP), $44.4M. 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 14, 2026, 26% of open-market insider filings across the whole market were buys (317 buys against 902 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 23, 2026?
39 open-market purchases were filed with the SEC on Sep 23, 2026, worth $75.1M across 37 companies. The largest was Orbimed Advisors Llc at Electra Therapeutics, Inc. (ETRA), $20.0M. The ten largest are listed above.
Were insiders net buyers or net sellers on Sep 23, 2026?
By dollar value, sellers: $75.1M bought against $242.4M 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 23, 2026 and was generated early the next morning from the same data the members area uses.