Zhenya Lindgardt
CIK 1891299 · View on SEC EDGAR ↗
First SEC filing: June 15, 2026 · Latest: June 15, 2026
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Insider transactions
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 11, 2026 | SERA | S | 6,990 | $2.01 | $14,050 | 865,009 Direct | -0.80% | Disposed | 4.5% (price as of 2026-08-21) |
| June 9, 2026 | SERA | S | 20,755 | $2.08 | $43,170 | 871,999 | — | — | 1.0% (price as of 2026-08-21) |
| March 11, 2026 | SERA | S | 2,973 | $2.04 | $6,065 | 738,314 Direct | -0.40% | Disposed | 2.9% (price as of 2026-08-21) |
| March 10, 2026 | SERA | S | 22,639 | $1.90 | $43,014 | 741,287 Direct | -2.96% | Disposed | 10.5% (price as of 2026-08-21) |
| Dec. 10, 2025 | SERA | S | 4,155 | $3.31 | $13,753 | 763,926 Direct | -0.54% | Disposed | -36.6% (price as of 2026-08-21) |
| Dec. 9, 2025 | SERA | S | 28,215 | $3.04 | $85,774 | 768,081 Direct | -3.54% | Disposed | -30.9% (price as of 2026-08-21) |
| Nov. 10, 2025 | SERA | S | 11,594 | $2.62 | $30,376 | 796,296 Direct | -1.44% | Disposed | -19.8% (price as of 2026-08-21) |
| Sept. 11, 2025 | SERA | S | 3,246 | $3.13 | $10,160 | 807,890 Direct | -0.40% | Disposed | -32.9% (price as of 2026-08-21) |
| June 10, 2025 | SERA | S | 3,344 | $1.48 | $4,949 | 840,865 Direct | -0.40% | Disposed | 41.9% (price as of 2026-08-21) |
| June 9, 2025 | SERA | S | 23,042 | $1.43 | $32,950 | 844,209 Direct | -2.66% | Disposed | 46.9% (price as of 2026-08-21) |
| May 8, 2025 | SERA | S | 9,406 | $2.44 | $22,951 | 867,251 Direct | -1.07% | Disposed | -13.9% (price as of 2026-08-21) |
| March 7, 2025 | SERA | S | 29,722 | $4.12 | $122,455 | 876,657 Direct | -3.28% | Disposed | -49.0% (price as of 2026-08-21) |
| Feb. 12, 2025 | SERA | S | 14,075 | $4.58 | $64,464 | 779,459 Direct | -1.77% | Disposed | -54.1% (price as of 2026-08-21) |
| Dec. 10, 2024 | SERA | S | 26,224 | $7.41 | $194,320 | 793,534 Direct | -3.20% | Disposed | -71.7% (price as of 2026-08-21) |
| Nov. 11, 2024 | SERA | S | 12,075 | $7.32 | $88,389 | 819,758 Direct | -1.45% | Disposed | -71.3% (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| March 12, 2026 | SERA | Stock Option (right to buy) | Class A Common Stock (239,442) | $1.99 | March 12, 2036 | 239,442 | Acquired |
| March 6, 2025 | SERA | Stock Option (right to buy) | Class A Common Stock (181,380) | $4.15 | March 6, 2035 | 181,380 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $607,000 | — | $526,718 | $493,971 | $392,122 | — | $14,000 | $2,033,811 |
| 2024 | $447,257 | — | — | — | $232,341 | — | $13,800 | $693,398 |
| 2023 | $302,954 | — | $1,813,500 | — | $57,191 | — | $22,638 | $2,196,283 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.