Spero Therapeutics (SPRO) stock: insider trades, news & valuation
Net sellingShare price and insider trades
Spero Therapeutics insider trading at a glance (Oct 9, 2026): in the past 12 months, 0 insiders bought $0 and 2 sold $552K of SPRO stock on the open market.
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SPRO insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | — | 0 | — | 0 |
| Q2 2026 | — | 0 | $63K | 1 |
| Q1 2026 | — | 0 | $393K | 7 |
| Q4 2025 | — | 0 | $95K | 1 |
Valuation, profit and volume
Summary
Over the past 12 months, 0 Spero Therapeutics, Inc. insiders reported open-market purchases totaling $0, while 2 insiders reported sales totaling $552K. 0 of 9 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| May 6SEC | Esther RajaveluSee Remarks | Sell | 25,240986,851 held (−2%) | $2.51 | $63K | -52.2% | — |
| Feb 9SEC | Esther RajaveluSee Remarks | Sell | 50,8161,012,091 held (−5%) | $2.36 | $120K | -49.2% | — |
| Feb 9SEC | Esther RajaveluSee Remarks | Sell | 37,1011,062,907 held (−3%) | $2.36 | $88K | -49.2% | — |
| Feb 9SEC | Timothy KeutzerCOO | Sell | 18,652742,506 held (−2%) | $2.36 | $44K | -49.2% | — |
| Feb 5SEC | Timothy KeutzerCOO | Sell | 24,224764,629 held (−3%) | $2.14 | $52K | -43.9% | — |
| Feb 5SEC | Timothy KeutzerCOO | Sell | 18,891788,853 held (−2%) | $2.20 | $42K | -45.5% | — |
| Feb 5SEC | Timothy KeutzerCOO | Sell | 3,471761,158 held (−0%) | $2.24 | $8K | -46.4% | — |
| Feb 4SEC | Esther RajaveluSee Remarks | Sell | 18,4421,100,008 held (−2%) | $2.20 | $41K | -45.5% | — |
| Nov 12SEC | Esther RajaveluSee Remarks | Sell | 40,270869,450 held (−4%) | $2.37 | $95K | -49.4% | — |
Insiders at Spero Therapeutics, Inc.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Esther RajaveluSee Remarks | — | $407K | May 6, 2026 | — |
| Timothy KeutzerCOO | — | $145K | Feb 9, 2026 | — |
SPRO stock: common questions
Are Spero Therapeutics, Inc. insiders buying SPRO stock?
In the past 12 months, 0 insiders reported open-market purchases of SPRO worth $0.
Are Spero Therapeutics, Inc. insiders selling SPRO stock?
2 insiders reported sales worth $552K over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is SPRO's 52-week range?
Over the past year SPRO has traded between $1.11 and $2.98. It last closed at $1.20 on Oct 9, 2026.