Timothy Keutzer, COO of Spero Therapeutics ($SPRO), sold shares on the open market five times over the past year for a total of $148.5 thousand. His most recent sale occurred on February 6, 2026. These transactions rank 8,999th among 11,678 insiders by sale value, well below the average of $8.6 million across 6.4 transactions per insider. Keutzer made no open market purchases in this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb. 6, 2026 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 18652 | $2.36 | 742,506.0000 | 56,339,295 | 2.45% | 0.03% |
| Feb. 3, 2026 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 24224 | $2.14 | 764,629.0000 | 56,339,295 | 3.07% | 0.04% |
| Feb. 2, 2026 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 18891 | $2.20 | 788,853.0000 | 56,339,295 | 2.34% | 0.03% |
| Feb. 2, 2026 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | A | Common Stock | 68000 | $0.00 | 807,744.0000 | 56,339,295 | 9.19% | 0.12% |
| Feb. 4, 2026 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 3471 | $2.24 | 761,158.0000 | 56,339,295 | 0.45% | 0.01% |
| Feb. 2, 2026 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | A | Stock Option (Right to Buy) | 137000 | $0.00 | 137,000.0000 | 56,339,295 | 9999.99% | 0.24% |
| Aug. 28, 2025 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 1695 | $1.97 | 739,744.0000 | 55,900,641 | 0.23% | 0.00% |
| Feb. 3, 2025 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | A | Common Stock | 266139 | $0.00 | 797,976.0000 | 0 | 50.04% | 0.00% |
| Feb. 5, 2025 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 3974 | $0.78 | 794,002.0000 | 0 | 0.50% | 0.00% |
| Feb. 5, 2025 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 27643 | $0.78 | 766,359.0000 | 0 | 3.48% | 0.00% |
| Feb. 5, 2025 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 24920 | $0.78 | 741,439.0000 | 0 | 3.25% | 0.00% |
| Aug. 27, 2024 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 2213 | $1.35 | 531,837.0000 | 0 | 0.41% | 0.00% |
| Feb. 2, 2024 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 30971 | $1.36 | 534,050.0000 | 0 | 5.48% | 0.00% |
| Feb. 1, 2024 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | A | Common Stock | 239731 | $0.00 | 565,021.0000 | 0 | 73.70% | 0.00% |
| Aug. 28, 2023 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Development Officer | S | Common Stock | 1854 | $1.26 | 325,290.0000 | 0 | 0.57% | 0.00% |
| Feb. 2, 2023 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | S | Common Stock | 3394 | $1.86 | 327,144.0000 | 0 | 1.03% | 0.00% |
| Feb. 1, 2023 | Spero Therapeutics, Inc. | $SPRO | Keutzer Timothy | Chief Operating Officer | A | Common Stock | 265957 | $0.00 | 330,538.0000 | 0 | 411.82% | 0.00% |