David R. Brennan

Board Director

Director

Alexion Pharmaceuticals, Inc.INSMED Inc INSMED Inc Alexion Pharmaceuticals, Inc.INSMED Inc

Insider activity · 24 months0 buys1 saleCumulative net flow

Nov 24 · 0 buys · 0 salesDec 24 · 0 buys · 0 salesJan 25 · 0 buys · 0 salesFeb 25 · 0 buys · 0 salesMar 25 · 0 buys · 0 salesApr 25 · 0 buys · 0 salesMay 25 · 0 buys · 0 salesJun 25 · 0 buys · 0 salesJul 25 · 0 buys · 0 salesAug 25 · 0 buys · 0 salesSept 25 · 0 buys · 0 salesOct 25 · 0 buys · 0 salesNov 25 · 0 buys · 0 salesDec 25 · 0 buys · 0 salesJan 26 · 0 buys · 0 salesFeb 26 · 0 buys · 0 salesMar 26 · 0 buys · 0 salesApr 26 · 0 buys · 0 salesMay 26 · 0 buys · 0 salesJun 26 · 0 buys · 0 salesJul 26 · 0 buys · 0 salesAug 26 · 0 buys · 0 salesSept 26 · 0 buys · 1 saleOct 26 · 0 buys · 0 sales

Total declarations

Companies

▲ Purchases (1 ops.)

€261k

▼ Sales (1 ops.)

€2.7M

Latest filing published 11 Sept 2026 for INSMED Inc, €2.7M. Read the official filing

Filing timeline

BuySale

David R. Brennan

Insider track record

Disclosed buys

Disclosed sells

T+90 hit rate

T+90 mean return

-13.2%

Across 1 buy signal with a settled T+90 return. Return basis: close on the day after publication.

Signal history

No signal scores available.

David R. Brennan: trading record in brief

David R. Brennan is a declared insider at 2 companies (board member); the most frequent names are INSMED Inc and Alexion Pharmaceuticals Inc. In total, 12 filings cover trades dated from 12 May 2021 to 9 September 2026.

Both buying and selling appear: 1 purchase worth €261k, against 1 sale worth €2.7M. The net balance comes to €2.4M on the selling side. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Other entries cover 7 share grants. 2026 to date brings no purchases and 1 sale.

The record was last updated on 11 September 2026 with an open-market sale (€2.7M) in INSMED Inc. The most recent open-market purchase was published on 3 November 2021, 1,810 days ago. Typically, a trade is published a median of 2 days after it takes place. The legal deadline for a Form 4 is two business days after the transaction. Every figure here comes from the filings published by SEC (Form 4) and describes the past, not future prices; it is not investment advice.