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Spero Therapeutics, Inc. (NASDAQ:SPRO)
US · Delayed Price · Currency is USD
Healthcare · Biotechnology
1.07-0.04 (-3.60%)
Insider Score
––Not scored
SPRO Insider Score
Insiders here have filed 1 Form 4 in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.
SPRO Stock Insider Trading Activity
SPRO stock’s insider trading shows 1 sale on the open market for an estimated $63.35K by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Zack Debra Other | Award | 162,311 | — | — | New | 162,311 | Aug 3, 2026 | — | Form 4 |
| Deshpande Milind Director | Award | 10,000 | — | — | 10.9% | 101,454 | Jun 23, 2026 | — | Form 4 |
| Smith Cynthia Director | Award | 10,000 | — | — | 13.3% | 85,000 | Jun 23, 2026 | — | Form 4 |
| VINK PATRICK V.J.J. Director | Award | 10,000 | — | — | 13.3% | 85,000 | Jun 23, 2026 | — | Form 4 |
| THOMAS FRANK E Director | Award | 10,000 | — | — | 13.3% | 85,000 | Jun 23, 2026 | — | Form 4 |
| Jackson Scott Thomas Director | Award | 10,000 | — | — | 13.3% | 85,000 | Jun 23, 2026 | — | Form 4 |
| Pottage John C Jr Director | Award | 10,000 | — | — | 13.3% | 85,000 | Jun 23, 2026 | — | Form 4 |
| Tregoning Kathleen Director | Award | 10,000 | — | — | 13.3% | 85,000 | Jun 23, 2026 | — | Form 4 |
| Rajavelu Esther Other | Sell | 25,240 | $2.51 | $63.35K | 2.5% | 986,851 | May 4, 2026 | — | Form 4 |
| Rajavelu Esther Other | Sell | 50,816 | $2.36 | $119.93K | 4.8% | 1,012,091 | Feb 6, 2026 | — | Form 4 |
| Rajavelu Esther Other | Sell | 37,101 | $2.36 | $87.56K | 3.4% | 1,062,907 | Feb 6, 2026 | — | Form 4 |
| Keutzer Timothy COO | Sell | 18,652 | $2.36 | $44.02K | 2.5% | 742,506 | Feb 6, 2026 | — | Form 4 |
| Keutzer Timothy COO | Sell | 3,471 | $2.24 | $7.78K | 0.5% | 761,158 | Feb 4, 2026 | — | Form 4 |
| Keutzer Timothy COO | Sell | 24,224 | $2.14 | $51.84K | 3.1% | 764,629 | Feb 3, 2026 | — | Form 4 |
| Rajavelu Esther Other | Sell | 18,442 | $2.20 | $40.57K | 1.6% | 1,100,008 | Feb 2, 2026 | — | Form 4 |
| Keutzer Timothy COO | Award | 68,000 | — | — | 9.2% | 807,744 | Feb 2, 2026 | — | Form 4 |
| Keutzer Timothy COO | Sell | 18,891 | $2.20 | $41.56K | 2.3% | 788,853 | Feb 2, 2026 | — | Form 4 |
| Rajavelu Esther Other | Award | 249,000 | — | — | 28.6% | 1,118,450 | Feb 2, 2026 | — | Form 4 |
| Rajavelu Esther Other | Sell | 40,270 | $2.37 | $95.44K | 4.4% | 869,450 | Nov 7, 2025 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Award (A) — Grant or award from the company, not a purchase
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.