List of insiders holdings for Spero Therapeutics Inc.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | GSK PLC 10% Owner | 2025-03-28 16:30:58 | 9,190,606 0 | 9,190,606 | Form 13D |
| 2 | Goyal Vikas Director | 2017-11-07 16:06:22 | 0 1,854,006 | 1,854,006 | Form 4 |
| 3 | Shukla Sath CEO & President | 2025-02-05 20:31:31 | 1,736,883 0 | 1,736,883 | Form 4 |
| 4 | Atlas Venture Fund IX L.P. Atlas Venture Associates IX L.P. Atlas Venture Associates IX LLC 10% Owner | 2018-02-13 11:04:09 | 1,376,968 0 | 1,376,968 | Form 13G |
| 5 | Rajavelu Esther See Remarks | 2026-05-06 21:53:26 | 986,851 0 | 986,851 | Form 4 |
| 6 | GV 2015 GP L.L.C. GV 2015 L.P. Alphabet Inc. 10% Owner | 2021-02-10 16:37:00 | 889,979 0 | 889,979 | Form 13G |
| 7 | Lundbeckfond Invest A/S 10% Owner | 2020-01-31 16:20:33 | 877,489 0 | 877,489 | Form 13G |
| 8 | HAMED KAMAL Chief Medical Officer | 2024-02-05 20:45:12 | 788,117 0 | 788,117 | Form 4 |
| 9 | Halse Reza Director | 2017-11-01 19:59:43 | 0 743,085 | 743,085 | Form 3 |
| 10 | Keutzer Timothy Chief Operating Officer | 2026-02-09 21:09:39 | 742,506 0 | 742,506 | Form 4 |
| 11 | Mahadevia Ankit Director | 2025-09-03 06:04:03 | 703,294 0 | 703,294 | Form 4 |
| 12 | JOSEPH TAMARA L Chief Legal Officer | 2024-02-05 20:48:40 | 531,615 0 | 531,615 | Form 4 |
| 13 | Zack Debra Chief Medical Officer | 2026-08-06 18:49:22 | 486,986 0 | 486,986 | Form 4 |
| 14 | Deshpande Milind Director | 2026-06-25 19:26:49 | 121,454 0 | 121,454 | Form 4 |
| 15 | Larkin Cristina Chief Operating Officer | 2022-02-03 16:18:28 | 116,771 0 | 116,771 | Form 4 |
| 16 | Melnick David A. Chief Medical Officer | 2022-02-03 16:19:47 | 115,271 0 | 115,271 | Form 4 |
| 17 | Pottage John C Jr Director | 2026-06-25 18:55:43 | 105,000 0 | 105,000 | Form 4 |
| 18 | Jackson Scott Thomas Director | 2026-06-25 18:57:29 | 105,000 0 | 105,000 | Form 4 |
| 19 | THOMAS FRANK E Director | 2026-06-25 18:59:52 | 105,000 0 | 105,000 | Form 4 |
| 20 | VINK PATRICK V.J.J. Director | 2026-06-25 19:12:10 | 105,000 0 | 105,000 | Form 4 |
| 21 | Smith Cynthia Director | 2026-06-25 19:14:32 | 105,000 0 | 105,000 | Form 4 |
| 22 | Tregoning Kathleen Director | 2026-06-25 19:17:12 | 105,000 0 | 105,000 | Form 4 |
| 23 | Sendek Joel Chief Financial Officer | 2019-01-02 19:16:35 | 65,000 0 | 65,000 | Form 4 |
| 24 | Parr Thomas R JR Chief Scientific Officer | 2019-01-02 19:23:52 | 35,000 0 | 35,000 | Form 4 |
| 25 | FORMELA JEAN FRANCOIS Director | 2021-08-18 16:41:29 | 7,500 0 | 7,500 | Form 4 |
| 26 | SOUTHWELL DAVID P Director | 2018-06-06 20:01:38 | 6,073 0 | 6,073 | Form 4 |
| 27 | Breum Casper Director | 2018-06-06 20:01:14 | 6,073 0 | 6,073 | Form 4 |
| 28 | Aquilo Capital Management LLC Aquilo Capital L.P. 10% Owner | 2023-02-14 11:16:34 | 0 0 | 0 | Form 13G |
| 29 | DiPalma Stephen J. See Remarks | 2023-07-24 16:46:28 | 0 0 | 0 | Form 3 |