Harrison Robert Gardner
Officer · SERA
As of 2026-09-16, Harrison Robert Gardner has 26 Form 4 transactions on record across 1 company — 10 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in March in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $155K
- Indirect $0
| SERA | direct | 76,712 sh | $155K |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-03-11 | SERA | Sale | 716 @ $2.04 | $1K | −0.9% of holding | 76,712 | Form 4 |
| 2026-03-09 | SERA | Sale | 3,360 @ $1.96 | $7K | −4.2% of holding | 77,428 | Form 4 |
| 2026-02-24 | SERA | Sale | 2,000 @ $2.34 | $5K | −2.4% of holding | 80,788 | Form 4 |
| 2026-01-27 | SERA | Sale | 2,000 @ $2.97 | $6K | −2.4% of holding | 82,788 | Form 4 |
| 2025-12-30 | SERA | Sale | 2,000 @ $3.00 | $6K | −2.3% of holding | 84,788 | Form 4 |
| 2025-12-10 | SERA | Sale | 616 @ $3.31 | $2K | −0.7% of holding | 86,788 | Form 4 |
| 2025-12-02 | SERA | Sale | 2,000 @ $2.93 | $6K | −2.2% of holding | 87,404 | Form 4 |
| 2025-11-10 | SERA | Sale | 6,528 @ $2.62 | $17K | −6.8% of holding | 89,404 | Form 4 |
| 2025-11-04 | SERA | Sale | 2,000 @ $3.07 | $6K | −2.0% of holding | 95,932 | Form 4 |
| 2025-10-07 | SERA | Sale | 2,000 @ $3.18 | $6K | −2.0% of holding | 97,932 | Form 4 |
| 2025-09-11 | SERA | Sale | 645 @ $3.13 | $2K | −0.6% of holding | 99,932 | Form 4 |
| 2025-09-09 | SERA | Sale | 2,000 @ $3.05 | $6K | −1.9% of holding | 100,577 | Form 4 |
| 2025-08-20 | SERA | Sale | 6,000 @ $2.22 | $13K | −5.5% of holding | 102,577 | Form 4 |
| 2025-08-08 | SERA | Sale | 5,962 @ $2.54 | $15K | −5.2% of holding | 108,577 | Form 4 |
| 2025-06-10 | SERA | Sale | 667 @ $1.48 | $987 | −0.6% of holding | 114,539 | Form 4 |
| 2025-05-08 | SERA | Sale | 6,551 @ $2.44 | $16K | −5.4% of holding | 115,206 | Form 4 |
| 2025-03-07 | SERA | Sale | 3,874 @ $4.16 | $16K | −3.1% of holding | 121,757 | Form 4 |
| 2025-03-06 | SERA | Sale | 3,251 @ $4.16 | $14K | −2.5% of holding | 125,631 | Form 4 |
| 2025-02-13 | SERA | Sale | 3,610 @ $4.28 | $15K | −3.4% of holding | 103,112 | Form 4 |
| 2025-02-12 | SERA | Sale | 7,297 @ $4.58 | $33K | −6.4% of holding | 106,722 | Form 4 |
| 2025-02-11 | SERA | Sale | 554 @ $3.97 | $2K | −0.5% of holding | 114,019 | Form 4 |
| 2025-01-13 | SERA | Sale | 2,264 @ $6.47 | $15K | −1.9% of holding | 114,573 | Form 4 |
| 2025-01-10 | SERA | Sale | 12,372 @ $7.30 | $90K | −9.4% of holding | 118,674 | Form 4 |
| 2025-01-10 | SERA | Sale | 1,837 @ $8.01 | $15K | −1.5% of holding | 116,837 | Form 4 |
2 award / exercise / gift records — not counted as purchases
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.