Michael Holder
Insider
First SEC filing: March 18, 2026 · Latest: June 12, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
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 |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 18, 2026 | CTKB | M | 2,181 | · | · | 62,875 Direct | +3.59% | Acquired | (price as of 2026-10-02) |
| Aug. 18, 2026 | CTKB | M | 2,181 | · | · | 7,276 Direct | -23.06% | Disposed | (price as of 2026-10-02) |
| June 10, 2026 | CTKB | M | 43,973 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| June 10, 2026 | CTKB | A | 18,261 | · | · | 18,261 Direct | · | Acquired | (price as of 2026-10-02) |
| June 10, 2026 | CTKB | A | 33,333 | · | · | 33,333 Direct | · | Acquired | (price as of 2026-10-02) |
| June 10, 2026 | CTKB | M | 43,973 | · | · | 60,694 Direct | +262.98% | Acquired | (price as of 2026-10-02) |
| June 1, 2026 | MDXH | A | 10,000 | · | · | 10,000 Direct | · | Acquired | (price as of 2026-10-02) |
| May 18, 2026 | CTKB | M | 1,454 | · | · | 16,721 Direct | +9.52% | Acquired | (price as of 2026-10-02) |
| May 18, 2026 | CTKB | M | 1,454 | · | · | 9,457 Direct | -13.33% | Disposed | (price as of 2026-10-02) |
| March 10, 2026 | CTKB | M | 2,908 | · | · | 15,267 Direct | +23.53% | Acquired | (price as of 2026-10-02) |
| March 10, 2026 | CTKB | M | 2,908 | · | · | 10,911 Direct | -21.04% | Disposed | (price as of 2026-10-02) |
| Nov. 18, 2025 | CTKB | M | 2,181 | · | · | 12,359 Direct | +21.43% | Acquired | (price as of 2026-10-02) |
| Nov. 18, 2025 | CTKB | M | 2,181 | · | · | 13,819 Direct | -13.63% | Disposed | (price as of 2026-10-02) |
| Aug. 18, 2025 | CTKB | M | 2,181 | · | · | 10,178 Direct | +27.27% | Acquired | (price as of 2026-10-02) |
| Aug. 18, 2025 | CTKB | M | 2,181 | · | · | 16,000 Direct | -12.00% | Disposed | (price as of 2026-10-02) |
| June 18, 2025 | CTKB | A | 43,973 | · | · | 43,973 Direct | · | Acquired | (price as of 2026-10-02) |
| June 18, 2025 | CTKB | A | 23,809 | · | · | 23,809 Direct | · | Acquired | (price as of 2026-10-02) |
| May 19, 2025 | CTKB | M | 1,454 | · | · | 7,997 Direct | +22.22% | Acquired | (price as of 2026-10-02) |
| May 19, 2025 | CTKB | M | 1,454 | · | · | 18,181 Direct | -7.41% | Disposed | (price as of 2026-10-02) |
| March 10, 2025 | CTKB | M | 2,908 | · | · | 6,543 Direct | +80.00% | Acquired | (price as of 2026-10-02) |
| March 10, 2025 | CTKB | M | 2,908 | · | · | 19,635 Direct | -12.90% | Disposed | (price as of 2026-10-02) |
| Nov. 18, 2024 | CTKB | M | 2,181 | · | · | 3,635 Direct | +150.00% | Acquired | (price as of 2026-10-02) |
| Nov. 18, 2024 | CTKB | M | 2,181 | · | · | 22,543 Direct | -8.82% | Disposed | (price as of 2026-10-02) |
| Aug. 19, 2024 | CTKB | M | 1,454 | · | · | 1,454 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 19, 2024 | CTKB | M | 1,454 | · | · | 24,724 Direct | -5.55% | Disposed | (price as of 2026-10-02) |
| June 5, 2024 | CTKB | A | 26,178 | · | · | 26,178 Direct | · | Acquired | (price as of 2026-10-02) |
| June 5, 2024 | CTKB | A | 37,878 | · | · | 37,878 Direct | · | Acquired | (price as of 2026-10-02) |
| July 1, 2022 | RCEL | A | 20,650 | · | · | 20,650 Direct | · | Acquired | (price as of 2026-10-02) |
| July 1, 2022 | RCEL | A | 35,950 | · | · | 46,450 Direct | +342.38% | Acquired | (price as of 2026-10-02) |
| July 6, 2021 | RCEL | A | 6,925 | · | · | 6,925 Direct | · | Acquired | (price as of 2026-10-02) |
| July 6, 2021 | RCEL | A | 10,500 | · | · | 10,500 Direct | · | Acquired | (price as of 2026-10-02) |
| May 11, 2021 | RCEL | A | 112,500 | · | · | 112,500 Direct | · | Acquired | (price as of 2026-10-02) |
| March 22, 2021 | RCEL | A | 37,500 | · | · | 37,500 Direct | · | Acquired | (price as of 2026-10-02) |
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 |
|---|---|---|---|---|---|---|---|
| Aug. 18, 2026 | CTKB | Restricted Stock Units | Common Stock | · | · | 2,181 | Disposed |
| June 10, 2026 | CTKB | Restricted Stock Units | Common Stock | · | · | 43,973 | Disposed |
| June 10, 2026 | CTKB | Director Stock Option (right to buy) | Common Stock | $4.05 | June 10, 2036 | 18,261 | Acquired |
| June 10, 2026 | CTKB | Restricted Stock Units | Common Stock | · | · | 33,333 | Acquired |
| June 1, 2026 | MDXH | Share Option | Ordinary Shares | $0.76 | May 28, 2036 | 10,000 | Acquired |
| May 18, 2026 | CTKB | Restricted Stock Units | Common Stock | · | · | 1,454 | Disposed |
| March 10, 2026 | CTKB | Restricted Stock Units | Common Stock | · | · | 2,908 | Disposed |
| Nov. 18, 2025 | CTKB | Restricted Stock Units | Common Stock | · | · | 2,181 | Disposed |
| Aug. 18, 2025 | CTKB | Restricted Stock Units | Common Stock | · | · | 2,181 | Disposed |
| June 18, 2025 | CTKB | Restricted Stock Units | Common Stock | · | · | 43,973 | Acquired |
| June 18, 2025 | CTKB | Director Stock Option (right to buy) | Common Stock | $3.07 | June 18, 2035 | 23,809 | Acquired |
| May 19, 2025 | CTKB | Restricted Stock Units | Common Stock | · | · | 1,454 | Disposed |
| March 10, 2025 | CTKB | Restricted Stock Units | Common Stock | · | · | 2,908 | Disposed |
| Nov. 18, 2024 | CTKB | Restricted Stock Units | Common Stock | · | · | 2,181 | Disposed |
| Aug. 19, 2024 | CTKB | Restricted Stock Units | Common Stock | · | · | 1,454 | Disposed |
| June 5, 2024 | CTKB | Restricted Stock Units | Common Stock | · | · | 26,178 | Acquired |
| June 5, 2024 | CTKB | Stock Option (right to buy) | Common Stock | $5.73 | June 5, 2034 | 37,878 | Acquired |
| July 1, 2022 | RCEL | Stock Options (Right to Buy) | Common Stock | $4.97 | July 1, 2032 | 20,650 | Acquired |
| July 6, 2021 | RCEL | Stock Options (Right to Buy) | Common Stock | $20.21 | July 6, 2031 | 6,925 | Acquired |
| May 11, 2021 | RCEL | Stock Options (Right to Buy) | Common Stock | $19.91 | May 11, 2031 | 112,500 | Acquired |
| March 22, 2021 | RCEL | Stock Options (Right to Buy) | Common Stock | $22.25 | March 22, 2031 | 37,500 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.
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 |
|---|---|---|---|---|---|---|---|---|
| 2022 | $430,128 | $184,900 | · | · | · | · | $48,988 | $925,212 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.