David R. Brennan serves as Executive at ALEXION PHARMACEUTICALS INC, where they oversee executive responsibilities. Since joining the company, David R. Brennan has executed 28 insider transactions totaling $395.0K, demonstrating a bullish approach to their equity position. Their most recent transaction on Nov 6, 2025 involved gifting 60,000 shares valued at $0.
David R. Brennan currently holds 60,000 shares of ALEXION PHARMACEUTICALS INC (ALXN), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, David R. Brennan has been a net buyer of ALXN stock. They have purchased $395.0K and sold $0 worth of shares.
David R. Brennan's most recent insider trade was on Nov 6, 2025, when they sold 60,000 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| May 13, 2024 | INSM | $0 | Award | 13,162 | $N/A | Discretionary |
| May 11, 2023 | INSM | $0 | Award | 13,192 | $N/A | Discretionary |
| May 11, 2022 | INSM | $0 | Award | 14,645 | $N/A | Discretionary |
| Nov 1, 2021 | INSM | $301.5K | Purchase | 10,000 | $30.15 | Discretionary |
| Jul 21, 2021 | ALXN | $0 | Disposition | 20,873 | $N/A | Discretionary |
| May 20, 2021 | ALXN | $0 | Award | 1,374 | $N/A | Discretionary |
| May 20, 2021 | ALXN | $0 | Award | 1,962 | $N/A | Discretionary |
| May 12, 2021 | INSM | $0 | Award | 7,558 | $N/A | Discretionary |
| May 14, 2020 | ALXN | $0 | Award | 2,428 | $N/A | Discretionary |
| May 14, 2020 | ALXN | $0 | Award | 3,468 | $N/A | Discretionary |
| May 12, 2020 | INSM | $0 | Award | 8,097 | $N/A | Discretionary |
| May 15, 2019 | INSM | $0 | Award | 6,899 | $N/A | Discretionary |
| May 15, 2019 | ALXN | $0 | Award | 1,908 | $N/A | Discretionary |
| May 15, 2019 | ALXN | $0 | Award | 2,726 | $N/A | Discretionary |
| May 15, 2018 | INSM | $0 | Award | 6,066 | $N/A | Discretionary |
| May 9, 2018 | ALXN | $0 | Award | 2,174 | $N/A | Discretionary |
| Jul 24, 2017 | INNL | $0 | Disposition | 237,440 | $N/A | Discretionary |
| May 17, 2017 | INSM | $0 | Award | 6,702 | $N/A | Discretionary |
| May 10, 2017 | ALXN | $0 | Award | 2,030 | $N/A | Discretionary |
| May 11, 2016 | ALXN | $0 | Award | 835 | $N/A | Discretionary |
| May 29, 2015 | INSM | $0 | Option Exercise | 2,690 | $N/A | Discretionary |
| May 19, 2015 | INSM | $0 | Award | 12,742 | $N/A | Discretionary |
| May 6, 2015 | ALXN | $0 | Award | 700 | $N/A | Discretionary |
| Jan 8, 2015 | INSM | $0 | Award | 6,222 | $N/A | Discretionary |
| Dec 15, 2014 | ALXN | $93.5K | Purchase | 500 | $186.99 | Discretionary |
| Jul 22, 2014 | ALXN | $0 | Award | 768 | $N/A | Discretionary |