Michael Holder
CIK 1515140 · View on SEC EDGAR ↗
First SEC filing: March 18, 2026 · Latest: June 12, 2026
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
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 |
|---|---|---|---|---|---|---|---|---|---|
| June 10, 2026 | CTKB | M | 43,973 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| June 10, 2026 | CTKB | A | 18,261 | — | — | 18,261 Direct | — | Acquired | (price as of 2026-08-19) |
| June 10, 2026 | CTKB | A | 33,333 | — | — | 33,333 Direct | — | Acquired | (price as of 2026-08-19) |
| June 10, 2026 | CTKB | M | 43,973 | — | — | 60,694 Direct | +262.98% | Acquired | (price as of 2026-08-19) |
| June 1, 2026 | MDXH | A | 10,000 | — | — | 10,000 Direct | — | Acquired | (price as of 2026-08-19) |
| July 1, 2022 | RCEL | A | 20,650 | — | — | 20,650 Direct | — | Acquired | (price as of 2026-08-19) |
| July 1, 2022 | RCEL | A | 35,950 | — | — | 46,450 Direct | +342.38% | Acquired | (price as of 2026-08-19) |
| July 6, 2021 | RCEL | A | 6,925 | — | — | 6,925 Direct | — | Acquired | (price as of 2026-08-19) |
| July 6, 2021 | RCEL | A | 10,500 | — | — | 10,500 Direct | — | Acquired | (price as of 2026-08-19) |
| May 11, 2021 | RCEL | A | 112,500 | — | — | 112,500 Direct | — | Acquired | (price as of 2026-08-19) |
| March 22, 2021 | RCEL | A | 37,500 | — | — | 37,500 Direct | — | Acquired | (price as of 2026-08-19) |
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 |
|---|---|---|---|---|---|---|---|
| June 10, 2026 | CTKB | Restricted Stock Units | Common Stock (43,973) | — | — | 43,973 | Disposed |
| June 10, 2026 | CTKB | Director Stock Option (right to buy) | Common Stock (18,261) | $4.05 | June 10, 2036 | 18,261 | Acquired |
| June 10, 2026 | CTKB | Restricted Stock Units | Common Stock (33,333) | — | — | 33,333 | Acquired |
| June 1, 2026 | MDXH | Share Option | Ordinary Shares (10,000) | $0.76 | May 28, 2036 | 10,000 | Acquired |
| July 1, 2022 | RCEL | Stock Options (Right to Buy) | Common Stock (20,650) | $4.97 | July 1, 2032 | 20,650 | Acquired |
| July 6, 2021 | RCEL | Stock Options (Right to Buy) | Common Stock (6,925) | $20.21 | July 6, 2031 | 6,925 | Acquired |
| May 11, 2021 | RCEL | Stock Options (Right to Buy) | Common Stock (112,500) | $19.91 | May 11, 2031 | 112,500 | Acquired |
| March 22, 2021 | RCEL | Stock Options (Right to Buy) | Common Stock (37,500) | $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.