Harrison Robert Gardner Insider Trading Activity
Harrison Robert Gardner has been net-selling over the last 12 months with 0 purchases and 15 sales across 1 company.
SERA is the most-traded position with 15 trades. The largest single transaction was a sale of SERA for $17K on Nov 10, 2025.
Performance Scorecard
Forward stock performance after each transaction by Harrison Robert Gardner. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | — | -10.3% | 47% | 15 |
| 90 days | — | -1.0% | 54% | 13 |
| 120 days | — | -1.0% | 58% | 12 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersSERA · SERA PROGNOSTICS, INC.
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Upgrade to ProRecent Trades
| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ROLE |
|---|---|---|---|---|---|---|
| Mar 11, 2026 | SERA | Sell | 716 | $2.04 | $1K | Chief Information Officer |
| Mar 9, 2026 | SERA | Sell | 3,360 | $1.96 | $7K | Chief Information Officer |
| Feb 24, 2026 | SERA | Sell | 2,000 | $2.34 | $5K | Chief Information Officer |
| Jan 27, 2026 | SERA | Sell | 2,000 | $2.97 | $6K | Chief Information Officer |
| Dec 30, 2025 | SERA | Sell | 2,000 | $3.00 | $6K | Chief Information Officer |
| Dec 10, 2025 | SERA | Sell | 616 | $3.31 | $2K | Chief Information Officer |
| Dec 2, 2025 | SERA | Sell | 2,000 | $2.93 | $6K | Chief Information Officer |
| Nov 10, 2025 | SERA | Sell | 6,528 | $2.62 | $17K | Chief Information Officer |
| Nov 4, 2025 | SERA | Sell | 2,000 | $3.07 | $6K | Chief Information Officer |
| Oct 7, 2025 | SERA | Sell | 2,000 | $3.18 | $6K | Chief Information Officer |
| Sep 11, 2025 | SERA | Sell | 645 | $3.13 | $2K | Chief Information Officer |
| Sep 9, 2025 | SERA | Sell | 2,000 | $3.05 | $6K | Chief Information Officer |
| Aug 20, 2025 | SERA | Sell | 6,000 | $2.22 | $13K | Chief Information Officer |
| Aug 8, 2025 | SERA | Sell | 5,962 | $2.54 | $15K | Chief Information Officer |
| Jun 10, 2025 | SERA | Sell | 667 | $1.48 | $987.16 | Chief Information Officer |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| SERA | SERA PROGNOSTICS, INC. | 15 | $100K |
Other insiders at SERA PROGNOSTICS, INC.
7 other tracked filers at SERA.