Harrison Robert Gardner Insider Trading Activity
Harrison Robert Gardner has been net-selling over the last 12 months with 0 purchases and 14 sales across 1 company.
SERA is the most-traded position with 14 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 | — | -1.8% | 47% | 15 |
| 120 days | — | +0.5% | 53% | 15 |
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 | Δ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
Mar 11, 2026 | SERA | Sell | 716 | $2.04 | $1K | −0.9% | Chief Information Officer | |
Mar 9, 2026 | SERA | Sell | 3,360 | $1.96 | $7K | −4.2% | Chief Information Officer | |
Feb 24, 2026 | SERA | Sell | 2,000 | $2.34 | $5K | −2.4% | Chief Information Officer | |
Jan 27, 2026 | SERA | Sell | 2,000 | $2.97 | $6K | −2.4% | Chief Information Officer | |
Dec 30, 2025 | SERA | Sell | 2,000 | $3.00 | $6K | −2.3% | Chief Information Officer | |
Dec 10, 2025 | SERA | Sell | 616 | $3.31 | $2K | −0.7% | Chief Information Officer | |
Dec 2, 2025 | SERA | Sell | 2,000 | $2.93 | $6K | −2.2% | Chief Information Officer | |
Nov 10, 2025 | SERA | Sell | 6,528 | $2.62 | $17K | −6.8% | Chief Information Officer | |
Nov 4, 2025 | SERA | Sell | 2,000 | $3.07 | $6K | −2.0% | Chief Information Officer | |
Oct 7, 2025 | SERA | Sell | 2,000 | $3.18 | $6K | −2.0% | Chief Information Officer | |
Sep 11, 2025 | SERA | Sell | 645 | $3.13 | $2K | −0.6% | Chief Information Officer | |
Sep 9, 2025 | SERA | Sell | 2,000 | $3.05 | $6K | −1.9% | Chief Information Officer | |
Aug 20, 2025 | SERA | Sell | 6,000 | $2.22 | $13K | −5.5% | Chief Information Officer | |
Aug 8, 2025 | SERA | Sell | 5,962 | $2.54 | $15K | −5.2% | Chief Information Officer | |
Jun 10, 2025 | SERA | Sell | 667 | $1.48 | $987.16 | −0.6% | 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.