Walter V Klemp
CIK 938419 · View on SEC EDGAR ↗
First SEC filing: Jan. 26, 2024 · Latest: Jan. 26, 2024
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
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 3, 2026 | MBRX | P | 533,333 | — | — | 564,340 Direct | +1720.04% | Acquired | (price as of 2026-08-20) |
| Aug. 16, 2017 | MBRX | S | 100,000 | $1.70 | $170,000 | 967,724 Direct | -9.37% | Disposed | -100.0% (price as of 2026-08-20) |
| May 11, 2017 | MBRX | P | 12,000 | $0.81 | $9,720 | 1,067,724 Direct | +1.14% | Acquired | -100.0% (price as of 2026-08-20) |
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. 3, 2026 | MBRX | Series I Warrants | Common Stock (1,599,999) | — | Aug. 3, 2031 | 1,599,999 | Acquired |
| June 22, 2026 | MBRX | Restricted Stock Units | Common Stock (360) | — | — | 360 | Disposed |
| June 20, 2026 | MBRX | Restricted Stock Units | Common Stock (150) | — | — | 150 | Disposed |
| June 6, 2018 | MBRX | Stock option (right to buy) | Common stock (603,000) | $1.82 | June 6, 2028 | 603,000 | Acquired |
| Oct. 3, 2017 | MBRX | Stock option (right to buy) | Common stock (340,000) | $2.49 | Oct. 3, 2027 | 340,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 4 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 |
|---|---|---|---|---|---|---|---|---|
| 2025 | $160,417 | — | — | $165,241 | — | — | — | $325,658 |
| 2024 | $200,000 | — | — | — | — | — | — | $200,000 |
| 2023 | $200,000 | — | — | — | — | — | — | $200,000 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.