Company · CIK 0001701108 · SIC 2834 — Pharmaceutical Preparations · Nasdaq
Spero Therapeutics, Inc. · SPRO
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 3, 2026 AForm 4 → | Aug 6, 6:49 pm EDT | Debra ZackChief Medical Officer | 162,311 | — | — | 162,311 | — | 10b5-1 late |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:26 pm EDT | Milind DeshpandeDirector | 10,000 | — | — | 101,454 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:17 pm EDT | Kathleen TregoningDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:14 pm EDT | Cynthia SmithDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:12 pm EDT | Patrick V.J.J. VinkDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:59 pm EDT | Frank E ThomasDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:57 pm EDT | Scott Thomas JacksonDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:55 pm EDT | John C Pottage Jr.Director | 10,000 | — | — | 85,000 | — | |
| Jul 17, 2018 PForm 4 → | Jul 17, 5:01 pm EDT | GLAXOSMITHKLINE PLC10% Owner | 80,000 | $12.50 | $1,000,000 | 1,934,006 | +4.31% | plan? |
| Jul 5, 2018 SForm 4 → | Jul 6, 9:45 pm EDT | Cristina LarkinChief Operating Officer | 4,000 | $17.50 | $70,000 | 1,500 | −72.7% | plan? |
| Jul 5, 2018 MForm 4 → | Jul 6, 9:45 pm EDT | Cristina LarkinChief Operating Officer | 4,000 | $5.90 | $23,600 | 5,500 | — | plan? |
| Jul 5, 2018 SForm 4 → | Jul 6, 9:44 pm EDT | Joel SendekChief Financial Officer | 2,000 | $17.50 | $35,000 | 15,181 | −11.6% | plan? |
| Jul 5, 2018 MForm 4 → | Jul 6, 9:44 pm EDT | Joel SendekChief Financial Officer | 2,000 | $5.90 | $11,800 | 17,181 | — | plan? |
| Jul 5, 2018 SForm 4 → | Jul 6, 9:41 pm EDT | Ankit MahadeviaSee Remarks, Director | 4,676 | $17.63 | $82,437 | 65,817 | −6.63% | plan? |
| Jul 5, 2018 MForm 4 → | Jul 6, 9:41 pm EDT | Ankit MahadeviaSee Remarks, Director | 4,676 | $5.90 | $27,588 | 67,417 | — | plan? |
| Nov 6, 2017 PForm 4 → | Nov 7, 7:42 pm EST | GLAXOSMITHKLINE PLC10% Owner | 428,571 | $14.00 | $5,999,994 | 1,854,006 | +30.1% | plan? |
| Nov 6, 2017 CForm 4 → | Nov 7, 7:42 pm EST | GLAXOSMITHKLINE PLC10% Owner | 1,425,435 | — | — | 1,425,435 | — | plan? |
| Nov 6, 2017 PForm 4 → | Nov 7, 4:08 pm EST | Jean Francois FormelaDirector | 428,571 | $14.00 | $5,999,994 | 2,408,128 | +21.6% | plan? |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:08 pm EST | Jean Francois FormelaDirector | 1,936,776 | — | — | 1,979,557 | — | plan? |
| Nov 6, 2017 PForm 4 → | Nov 7, 4:06 pm EST | Vikas GoyalDirector | 428,571 | $14.00 | $5,999,994 | 1,854,006 | +30.1% | plan? |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:06 pm EST | Vikas GoyalDirector | 1,425,435 | — | — | 1,425,435 | — | plan? |
| Nov 6, 2017 PForm 4 → | Nov 7, 4:05 pm EST | Joel SendekChief Financial Officer | 5,000 | $14.00 | $70,000 | 15,181 | +49.1% | plan? |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:05 pm EST | Joel SendekChief Financial Officer | 10,181 | — | — | 10,181 | — | plan? |
| Nov 6, 2017 PForm 4 → | Nov 7, 4:05 pm EST | Cristina LarkinChief Operating Officer | 1,500 | $14.00 | $21,000 | 1,500 | — | plan? |
| Nov 6, 2017 PForm 4 → | Nov 7, 4:05 pm EST | Casper BreumDirector | 214,285 | $14.00 | $2,999,990 | 1,091,774 | +24.4% | plan? |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:05 pm EST | Casper BreumDirector | 877,489 | — | — | 877,489 | — | plan? |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 3, 2026 AForm 4 → | Aug 6, 6:49 pm EDT | Debra ZackChief Medical Officer | 324,675 | — | — | 324,675 | — | 10b5-1 late |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:26 pm EDT | Milind DeshpandeDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:17 pm EDT | Kathleen TregoningDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:14 pm EDT | Cynthia SmithDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:12 pm EDT | Patrick V.J.J. VinkDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:59 pm EDT | Frank E ThomasDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:57 pm EDT | Scott Thomas JacksonDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:55 pm EDT | John C Pottage Jr.Director | 20,000 | — | — | 20,000 | — | |
| Jan 2, 2019 AForm 4 → | Jan 2, 7:23 pm EST | Thomas R Parr Jr.Chief Scientific Officer | 35,000 | — | — | 35,000 | — | |
| Jan 2, 2019 AForm 4 → | Jan 2, 7:20 pm EST | David A. MelnickChief Medical Officer | 65,000 | — | — | 65,000 | — | |
| Jan 2, 2019 AForm 4 → | Jan 2, 7:18 pm EST | Cristina LarkinChief Operating Officer | 65,000 | — | — | 65,000 | — | |
| Jan 2, 2019 AForm 4 → | Jan 2, 7:16 pm EST | Joel SendekChief Financial Officer | 65,000 | — | — | 65,000 | — | |
| Jan 2, 2019 AForm 4 → | Jan 2, 7:12 pm EST | Ankit MahadeviaCEO and President, Director | 180,000 | — | — | 180,000 | — | |
| Sep 21, 2018 AForm 4 → | Sep 21, 5:38 pm EDT | John C Pottage Jr.Director | 12,146 | — | — | 12,146 | — | |
| Jul 5, 2018 MForm 4 → | Jul 6, 9:45 pm EDT | Cristina LarkinChief Operating Officer | 4,000 | — | — | 20,434 | — | |
| Jul 5, 2018 MForm 4 → | Jul 6, 9:44 pm EDT | Joel SendekChief Financial Officer | 2,000 | — | — | 165,833 | — | |
| Jul 5, 2018 MForm 4 → | Jul 6, 9:41 pm EDT | Ankit MahadeviaSee Remarks, Director | 4,676 | — | — | 118,888 | — | |
| Jun 5, 2018 AForm 4 → | Jun 6, 8:02 pm EDT | Frank E ThomasDirector | 6,073 | — | — | 6,073 | — | |
| Jun 5, 2018 AForm 4 → | Jun 6, 8:01 pm EDT | Jean Francois FormelaDirector | 6,073 | — | — | 6,073 | — | |
| Jun 5, 2018 AForm 4 → | Jun 6, 8:01 pm EDT | David P SouthwellDirector | 6,073 | — | — | 6,073 | — | |
| Jun 5, 2018 AForm 4 → | Jun 6, 8:01 pm EDT | Casper BreumDirector | 6,073 | — | — | 6,073 | — | |
| Jun 5, 2018 AForm 4 → | Jun 6, 8:00 pm EDT | Milind DeshpandeDirector | 6,073 | — | — | 6,073 | — | |
| Jun 5, 2018 AForm 4 → | Jun 6, 8:00 pm EDT | Patrick V.J.J. VinkDirector | 6,073 | — | — | 6,073 | — | |
| Mar 30, 2018 AForm 4 → | Mar 30, 5:30 pm EDT | David P SouthwellDirector | 12,146 | — | — | 12,146 | — | |
| Jan 4, 2018 AForm 4 → | Jan 5, 10:11 am EST | David A. MelnickChief Medical Officer | 135,000 | — | — | 135,000 | — | |
| Dec 13, 2017 AForm 4 → | Dec 15, 4:07 pm EST | Cristina LarkinChief Operating Officer | 62,540 | — | — | 62,540 | — | |
| Dec 13, 2017 AForm 4 → | Dec 15, 4:06 pm EST | Joel SendekChief Financial Officer | 27,795 | — | — | 27,795 | — | |
| Dec 13, 2017 AForm 4 → | Dec 15, 4:05 pm EST | Thomas R Parr Jr.Chief Scientific Officer | 36,134 | — | — | 36,134 | — | |
| Dec 13, 2017 AForm 4 → | Dec 15, 4:05 pm EST | Ankit MahadeviaSee Remarks, Director | 125,079 | — | — | 125,079 | — | |
| Nov 6, 2017 CForm 4 → | Nov 7, 7:42 pm EST | GLAXOSMITHKLINE PLC10% Owner | 7,399,735 | — | — | 0 | — | |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:08 pm EST | Jean Francois FormelaDirector | 10,507,362 | — | — | 0 | — | |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:06 pm EST | Vikas GoyalDirector | 7,399,735 | — | — | 0 | — | |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:05 pm EST | Joel SendekChief Financial Officer | 61,880 | — | — | 0 | — | |
| Nov 6, 2017 CForm 4 → | Nov 7, 4:05 pm EST | Casper BreumDirector | 4,320,936 | — | — | 0 | — |