Posner Brian S
CIK 0001372455 Name as filed on the most recent filing
Filed as Posner Brian S (41)
46 transaction lines · from 41 filings · filed 2006-10-11 to 2026-06-09 The span is the filing dates this catalog holds, not the entity's full filing history. Absence here is not evidence of absence at the SEC.
A line appears here when the filing that carries it names this CIK as a reporting owner, not only when the parser picked this CIK as the line's primary owner. That is why a joint filing appears on both owners' pages rather than vanishing from the second one. The catalog never merges two CIKs into one person and never splits one CIK into two: identity here is the SEC's own identifier and nothing else.
Issuers this insider has filed against
Ordered by last-seen filing date, newest first. Roles are as filed on the Form 4 and are not normalised.
This container could not be filled from the store. It is showing nothing because a read failed, not because no insider filed: those are different facts and this catalog will not let one stand in for the other. The last ingest the store recorded was 2026-08-20 05:22 UTC.
- ISSUER Dyne Therapeutics, Inc. 7 filings
- ISSUER Arch Capital Group Ltd. 15 filings
- ISSUER Biogen Inc. 14 filings
- ISSUER Bioverativ Inc. 2 filings
- ISSUER BG Medicine, Inc. 2 filings
- ISSUER LMP Capital & Income Fund Inc. 1 filings
No issuer is recorded
The catalog holds no filing linking this CIK to an issuer.
Transactions
Every stored Form 4 line naming this reporting owner, newest transaction date first. Each row links to the filing it came from.
46 transactions · Newest transaction date first, id breaking the tie.
This container could not be filled from the store. It is showing nothing because a read failed, not because no insider filed: those are different facts and this catalog will not let one stand in for the other. The last ingest the store recorded was 2026-08-20 05:22 UTC.
| Direction | Date | Issuer | Code | Shares | Price | Value USD | Filing |
|---|---|---|---|---|---|---|---|
| 2026-06-08 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 2,000 acquired | 16.94 | 33,880.00 | Form 4, filing 0001193125-26-264004 | |
| 2026-06-03 |
Arch Capital Group Ltd. ACGL |
S, Open-market sale | 3,000 disposed | 19.66 | 58,980.00 | Form 4, filing 0001372455-26-000008 | |
| 2026-06-03 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 2,500 acquired | 17.48 | 43,700.00 | Form 4, filing 0001193125-26-259563 | |
| 2026-05-26 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 2,000 acquired | 18.21 | 36,420.00 | Form 4, filing 0001193125-26-245237 | |
| 2026-05-20 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 2,500 acquired | 17.12 | 42,800.00 | Form 4, filing 0001193125-26-236877 | |
| 2026-05-11 |
Arch Capital Group Ltd. ACGL |
S, Open-market sale | 2,000 disposed | 17.14 | 34,283.00 | Form 4, filing 0001372455-26-000006 | |
| 2026-03-30 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 2,000 acquired | 17.08 | 34,160.00 | Form 4, filing 0001193125-26-137998 | |
| 2026-03-11 |
Arch Capital Group Ltd. ACGL |
S, Open-market sale | 3,000 disposed | 17.12 | 51,345.00 | Form 4, filing 0001372455-26-000002 | |
| 2026-03-11 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 2,000 acquired | 19.35 | 38,700.00 | Form 4, filing 0001193125-26-106306 | |
| 2026-03-06 |
Dyne Therapeutics, Inc. DYN |
P, Open-market purchase | 3,000 acquired | 15.06 | 45,180.00 | Form 4, filing 0001193125-26-100485 | |
| 2025-08-01 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 1,000 acquired | 17.34 | 17,338.00 | Form 4, filing 0001415889-25-020959 | |
| 2022-10-28 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 2,000 acquired | 17.60 | 35,200.00 | Form 4, filing 0001415889-22-010947 | |
| 2022-04-29 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 2,000 acquired | 19.22 | 38,450.00 | Form 4, filing 0001179110-22-002773 | |
| 2021-06-14 |
Arch Capital Group Ltd. ACGL |
S, Open-market sale | 4,000 disposed | 25.24 | 100,971.20 | Form 4, filing 0001179110-21-006739 | |
| 2021-06-04 |
Biogen Inc. BIIB |
S, Open-market sale | 360 disposed | 274.17 | 98,701.20 | Form 4, filing 0001127602-21-019402 | |
| 2020-05-13 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 1,000 acquired | 22.16 | 22,159.40 | Form 4, filing 0001179110-20-006082 | |
| 2020-05-06 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 1,000 acquired | 23.72 | 23,717.80 | Form 4, filing 0001179110-20-005631 | |
| 2019-12-02 |
Biogen Inc. BIIB |
S, Open-market sale | 1,055 disposed | 292.35 | 308,429.25 | Form 4, filing 0001127602-19-034175 | |
| 2018-11-28 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 500 acquired | 21.86 | 10,932.10 | Form 4, filing 0001179110-18-013288 | |
| 2018-11-28 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 500 acquired | 28.24 | 14,118.50 | Form 4, filing 0001179110-18-013288 | |
| 2018-11-05 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 2,500 acquired | 22.45 | 56,124.00 | Form 4, filing 0001179110-18-012595 | |
| 2018-05-03 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 2,000 acquired | 79.25 | 158,496.00 | Form 4, filing 0001179110-18-006279 | |
| 2018-05-03 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 1,000 acquired | 77.38 | 77,380.00 | Form 4, filing 0001179110-18-006279 | |
| 2017-08-09 |
Bioverativ Inc. BIVV |
P, Open-market purchase | 1,000 acquired | 59.19 | 59,189.90 | Form 4, filing 0001127602-17-025422 | |
| 2017-06-09 |
Biogen Inc. BIIB |
S, Open-market sale | 1,084 disposed | 256.31 | 277,840.04 | Form 4, filing 0001127602-17-021193 | |
| 2017-05-24 |
Bioverativ Inc. BIVV |
P, Open-market purchase | 1,300 acquired | 53.90 | 70,068.44 | Form 4, filing 0001127602-17-019291 | |
| 2017-05-24 |
Bioverativ Inc. BIVV |
P, Open-market purchase | 700 acquired | 53.79 | 37,656.01 | Form 4, filing 0001127602-17-019291 | |
| 2016-11-18 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 6,000 acquired | 21.88 | 131,271.00 | Form 4, filing 0001179110-16-031892 | |
| 2015-06-22 |
Biogen Inc. BIIB |
S, Open-market sale | 470 disposed | 415.00 | 195,050.00 | Form 4, filing 0001127602-15-021184 | |
| 2015-06-15 |
Biogen Inc. BIIB |
S, Open-market sale | 400 disposed | 386.64 | 154,656.00 | Form 4, filing 0001127602-15-020831 | |
| 2014-06-20 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 605 disposed | 315.00 | 190,575.00 | Form 4, filing 0001127602-14-021498 | |
| 2014-06-13 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 700 disposed | 310.50 | 217,350.00 | Form 4, filing 0001127602-14-020912 | |
| 2014-03-31 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 2,500 disposed | 296.11 | 740,275.00 | Form 4, filing 0001127602-14-013127 | |
| 2014-03-31 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 500 disposed | 300.00 | 150,000.00 | Form 4, filing 0001127602-14-013127 | |
| 2013-08-19 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 2,500 acquired | 23.58 | 58,947.25 | Form 4, filing 0001179110-13-013308 | |
| 2013-08-02 |
Arch Capital Group Ltd. ACGL |
P, Open-market purchase | 5,000 acquired | 25.25 | 126,230.50 | Form 4, filing 0001179110-13-012661 | |
| 2013-06-11 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 2,020 disposed | 219.62 | 443,632.40 | Form 4, filing 0001127602-13-020317 | |
| 2013-03-18 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 4,500 disposed | 174.81 | 786,645.00 | Form 4, filing 0001127602-13-011387 | |
| 2012-11-19 |
BG Medicine, Inc. BGMD |
P, Open-market purchase | 10,000 acquired | 1.16 | 11,650.00 | Form 4, filing 0001181431-12-059694 | |
| 2012-06-07 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 2,500 disposed | 135.00 | 337,500.00 | Form 4, filing 0001127602-12-019719 | |
| 2012-06-04 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 2,400 disposed | 126.45 | 303,480.00 | Form 4, filing 0001127602-12-019278 | |
| 2012-05-22 |
BG Medicine, Inc. BGMD |
P, Open-market purchase | 10,000 acquired | 4.04 | 40,400.00 | Form 4, filing 0001181431-12-032162 | |
| 2011-08-29 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 15,000 disposed | 92.53 | 1,387,894.50 | Form 4, filing 0001127602-11-024535 | |
| 2011-05-25 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 13,170 disposed | 94.43 | 1,243,677.34 | Form 4, filing 0001127602-11-017748 | |
| 2011-05-25 |
Biogen Idec Inc. BIIB |
S, Open-market sale | 12,805 disposed | 93.74 | 1,200,349.66 | Form 4, filing 0001127602-11-017748 | |
| 2006-10-11 |
LMP Capital & Income Fund Inc. SCD |
P, Open-market purchase | 5,000 acquired | 17.95 | 89,750.00 | Form 4, filing 0001372455-06-000002 |
This column is intentionally blank
No transaction line is stored for this reporting owner, though the catalog holds filings naming them. That happens when the filings report only holdings or only positions the store does not carry, and when a parse failed; each filing page states its own parse status.
- P, Open-market purchase
- Open-market purchase
- S, Open-market sale
- Open-market sale
Every value is as reported on the Form 4. A price the filing did not report is marked Not reported and no value is computed from it. Codes outside the open market, drawn in grey behind a dashed rule, are compensation and administrative machinery rather than a decision to trade at the prevailing price.
What this insider's stored lines contain
Exact counts over every stored line for this entity. This is a statement of composition, not a filter: the only filter this page offers is the open-market one above, because that is the only one an index serves today.
- Open-market purchase 26
- Open-market sale 20
- Option exercise 0
- Grant or award 0
- Tax withholding 0
- Disposition to the issuer 0
- In-the-money option exercise 0
How to cite this page
ebomi catalog. Posner Brian S, insider transactions. Retrieved 2026-08-21 from https://ebomi.com/insider/0001372455
Balogh, A. Insider trading. Scientific Data 10, 237 (2023) doi:10.1038/s41597-023-02147-6