Karin Anna Tollefson
CIK 1976551 · View on SEC EDGAR ↗
Insider
First SEC filing: May 26, 2026 · Latest: May 26, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 6 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 21, 2026 | VSTM | A | 36,000 | — | — | 52,666 Direct | +216.01% | Acquired | (price as of 2026-08-21) |
| May 22, 2025 | VSTM | A | 12,500 | — | — | 12,500 Direct | — | Acquired | (price as of 2026-08-21) |
| May 22, 2025 | VSTM | A | 8,333 | — | — | 16,666 Direct | +100.00% | Acquired | (price as of 2026-08-21) |
| June 18, 2024 | VSTM | A | 12,500 | — | — | 12,500 Direct | — | Acquired | (price as of 2026-08-21) |
| June 18, 2024 | VSTM | A | 8,333 | — | — | 8,333 Direct | — | Acquired | (price as of 2026-08-21) |
| May 15, 2023 | VSTM | A | 187,500 | — | — | 187,500 Direct | — | Acquired | (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 |
|---|---|---|---|---|---|---|---|
| May 22, 2025 | VSTM | Stock Option (right to buy) | Common Stock (12,500) | $7.48 | May 22, 2035 | 12,500 | Acquired |
| June 18, 2024 | VSTM | Stock Option (right to buy) | Common Stock (12,500) | $3.27 | June 18, 2034 | 12,500 | Acquired |
| May 15, 2023 | VSTM | Stock Option (right to buy) | Common Stock (187,500) | $0.42 | May 15, 2033 | 187,500 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).