InsidersTradesSigma
Total declarations
Companies
▲ Purchases (10 ops.)
▼ Sales (5 ops.)
Insider track record
Board DirectorDisclosed buys
10
Disclosed sells
5
T+90 hit rate
60%
T+90 mean return
+3.8%
Across 5 buy signals with a settled T+90 return. Return basis: close on the day after publication.
Signal history
Discover the full record of transactions filed by Posner Brian S, Director. Director active across 3 companies, notably Arch Capital Group Ltd.. Cumulatively, 22 filings have been published. Split: 10 buys · 5 sells. Total volume traded: €584k. History available since 4 June 2021. The latest transaction was disclosed on 3 June 2026 (Acquisition). Regulator: SEC (Form 4). The full history is accessible without signup.
Companies and markets linked to Posner Brian S
Open company profiles for insider transactions, fundamentals and analyst consensus when available.
Declarations22 total
2,000 sharesCommon StockSEC:0001193125-26-264004:0
Canonical exit: 6 Sept 2026 (T+90)
2,500 shares@ US$17.480.0011% mcap35.6% of flowCommon StockSEC:0001193125-26-259563:0
Canonical exit: 1 Sept 2026 (T+90)
3,000 shares@ US$19.660.0002% mcap12.5% of flowDepositary Shares, Series FSEC:0001372455-26-000008:0
2,000 shares@ US$18.210.0010% mcap45.9% of flowCommon StockSEC:0001193125-26-245237:0
Canonical exit: 24 Aug 2026 (T+90)
2,500 shares@ US$17.120.0012% mcap54.1% of flowCommon StockSEC:0001193125-26-236877:0
Canonical exit: 18 Aug 2026 (T+90)
2,000 shares@ US$17.14150.0001% mcap8.2% of flowDepositary Shares, Series GSEC:0001372455-26-000006:0
2,000 shares@ US$17.0822.0% of flowCommon StockSEC:0001193125-26-137998:0
Canonical exit: 28 Jun 2026 (T+90)
2,000 shares@ US$19.3516.0% of flowCommon StockSEC:0001193125-26-106306:0
Canonical exit: 9 Jun 2026 (T+90)
3,000 shares@ US$17.11513.1% of flowDepositary Shares, Series GSEC:0001372455-26-000002:0
3,000 shares@ US$15.0618.7% of flowCommon StockSEC:0001193125-26-100485:0
Canonical exit: 4 Jun 2026 (T+90)
1,000 shares@ US$17.3385.2% of flowDepositary Shares, Series GSEC:0001415889-25-020959:0
Canonical exit: 30 Oct 2025 (T+90)
1,564 sharesCommon Shares, $.0011 par value per shareSEC:0001415889-25-012562:0
1,455 sharesCommon Shares, $.0011 par value per shareSEC:0001415889-24-013065:0
1,714 sharesCommon Shares, $.0011 par value per shareSEC:0001415889-23-007585:0
2,000 shares@ US$17.6010.0% of flowDepositary Shares, Series GSEC:0001415889-22-010947:0
Canonical exit: 26 Jan 2023 (T+90)
2,642 sharesCommon Shares, $.0011 par value per shareSEC:0001179110-22-002889:0
2,000 shares@ US$19.2250.0001% mcap12.6% of flowDepositary Shares, Series GSEC:0001179110-22-002773:0
Canonical exit: 28 Jul 2022 (T+90)
2,000 shares@ US$25.0012.8% of flowDepositary Shares, Series ESEC:0001179110-21-009038:0
775 shares0Common StockSEC:0001127602-21-021343:0
4,000 shares@ US$25.242824.7% of flowDepositary Shares, Series ESEC:0001179110-21-006739:0
360 shares@ US$274.17100.0% of flowCommon StockSEC:0001127602-21-019402:0
3,143 sharesCommon Shares, $.0011 par value per shareSEC:0001179110-21-005110:0
22 of 22 declarations
About Posner Brian S
Posner Brian S is Administrateur at Arch Capital Group Ltd., Dyne Therapeutics, Inc. and BIOGEN INC. He has 22 filings in total, and across the 22 sampled filings, the buy and sell amounts are EUR 294893 and EUR 331946, respectively, between 2021-05-10 and 2026-06-09.
