Matthew Kirkby
CIK 2050147 · View on SEC EDGAR ↗
Insider
First SEC filing: Dec. 31, 2024 · Latest: Dec. 31, 2024
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 2 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 |
|---|---|---|---|---|---|---|---|---|---|
| April 1, 2026 | BYSI | A | 23,902 | — | — | 23,902 Direct | — | Acquired | (price as of 2026-08-21) |
| April 21, 2025 | BYSI | A | 25,763 | — | — | 25,763 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 |
|---|---|---|---|---|---|---|---|
| April 1, 2026 | BYSI | Stock Options (right to buy) | Ordinary Shares (23,902) | $1.64 | April 1, 2036 | 23,902 | Acquired |
| April 21, 2025 | BYSI | Stock Options (right to buy) | Ordinary Shares (25,763) | $1.31 | April 21, 2035 | 25,763 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 8 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (5,000) | 5,000 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (10,000) | 10,000 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (10,000) | 10,000 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (10,000) | 10,000 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (15,000) | 15,000 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (25,000) | 25,000 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (19,875) | 19,875 | Direct |
| Dec. 31, 2024 | BYSI | Stock Options (right to buy)→ Ordinary Shares (10,000) | 10,000 | Direct |