Harrison Robert Gardner, Chief Information Officer at SERA Prognostics, Inc. ($SERA), made 16 open market sales of company shares over the past year, totaling $115,722. His latest sale occurred on March 11, 2026. These transactions rank 9,356th among 11,678 insiders by sale value, well below the average of $8.6 million per insider across 6.4 transactions on average. Gardner recorded no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 11, 2026 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 716 | $2.04 | 76,712.0000 | 49,525,108 | 0.92% | 0.00% |
| March 9, 2026 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 3360 | $1.96 | 77,428.0000 | 49,525,108 | 4.16% | 0.01% |
| Feb. 24, 2026 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $2.34 | 80,788.0000 | 49,525,108 | 2.42% | 0.00% |
| Jan. 27, 2026 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $2.97 | 82,788.0000 | 49,525,108 | 2.36% | 0.00% |
| Dec. 30, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $3.00 | 84,788.0000 | 49,525,108 | 2.30% | 0.00% |
| Dec. 10, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 616 | $3.31 | 86,788.0000 | 49,525,108 | 0.70% | 0.00% |
| Dec. 2, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $2.93 | 87,404.0000 | 49,525,108 | 2.24% | 0.00% |
| Nov. 10, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 6528 | $2.62 | 89,404.0000 | 49,525,108 | 6.80% | 0.01% |
| Nov. 4, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $3.07 | 95,932.0000 | 49,525,108 | 2.04% | 0.00% |
| Oct. 7, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $3.18 | 97,932.0000 | 49,525,108 | 2.00% | 0.00% |
| Sept. 11, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 645 | $3.13 | 99,932.0000 | 33,156,936 | 0.64% | 0.00% |
| Sept. 9, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2000 | $3.05 | 100,577.0000 | 33,156,936 | 1.95% | 0.01% |
| Aug. 20, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 6000 | $2.22 | 102,577.0000 | 33,156,936 | 5.53% | 0.02% |
| Aug. 8, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 5962 | $2.54 | 108,577.0000 | 33,156,936 | 5.21% | 0.02% |
| June 10, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 667 | $1.48 | 114,539.0000 | 33,156,936 | 0.58% | 0.00% |
| May 8, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 6551 | $2.44 | 115,206.0000 | 33,156,936 | 5.38% | 0.02% |
| March 7, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 3874 | $4.16 | 121,757.0000 | 33,156,936 | 3.08% | 0.01% |
| March 5, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | A | Stock Option (right to buy) | 36830 | $0.00 | 36,830.0000 | 33,156,936 | 9999.99% | 0.11% |
| March 5, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | A | Class A Common Stock | 25770 | $0.00 | 128,882.0000 | 33,156,936 | 24.99% | 0.08% |
| March 6, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 3251 | $4.16 | 125,631.0000 | 33,156,936 | 2.52% | 0.01% |
| Feb. 12, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 7297 | $4.58 | 106,722.0000 | 33,156,936 | 6.40% | 0.02% |
| Feb. 13, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 3610 | $4.28 | 103,112.0000 | 33,156,936 | 3.38% | 0.01% |
| Feb. 11, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 554 | $3.97 | 114,019.0000 | 33,156,936 | 0.48% | 0.00% |
| Jan. 13, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2264 | $6.47 | 114,573.0000 | 33,156,936 | 1.94% | 0.01% |
| Jan. 10, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 1837 | $8.01 | 116,837.0000 | 33,156,936 | 1.55% | 0.01% |
| Jan. 10, 2025 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 12372 | $7.30 | 118,674.0000 | 33,156,936 | 9.44% | 0.04% |
| Nov. 11, 2024 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 4727 | $7.32 | 131,046.0000 | 33,522,726 | 3.48% | 0.01% |
| Aug. 7, 2024 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 5022 | $7.42 | 135,773.0000 | 31,200,652 | 3.57% | 0.02% |
| May 8, 2024 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 4902 | $9.59 | 140,795.0000 | 31,200,652 | 3.36% | 0.02% |
| March 6, 2024 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 2138 | $9.02 | 145,697.0000 | 31,200,652 | 1.45% | 0.01% |
| Feb. 6, 2024 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 5665 | $8.03 | 147,835.0000 | 31,200,652 | 3.69% | 0.02% |
| Nov. 6, 2023 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | A | Class A Common Stock | 125000 | $0.00 | 153,500.0000 | 0 | 438.60% | 0.00% |
| June 5, 2023 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | S | Class A Common Stock | 5000 | $3.23 | 28,500.0000 | 0 | 14.93% | 0.00% |
| March 6, 2023 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | A | Class A Common Stock | 28500 | $0.00 | 28,500.0000 | 0 | 9999.99% | 0.00% |
| March 6, 2023 | SERA PROGNOSTICS, INC. | $SERA | Harrison Robert Gardner | Chief Information Officer | A | Stock Option (right to buy) | 45000 | $0.00 | 45,000.0000 | 0 | 9999.99% | 0.00% |