Christopher D. Brown
CIK 1836988 · View on SEC EDGAR ↗
First SEC filing: June 18, 2025 · Latest: June 5, 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
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 11, 2026 | MASS | S 10b5-1 | 8,358 | $9.23 | $77,144 | 805,559 Direct | -1.03% | Disposed | 8.2% (price as of 2026-08-19) |
| Aug. 10, 2026 | MASS | S 10b5-1 | 9,442 | $9.03 | $85,261 | 813,917 Direct | -1.15% | Disposed | 10.6% (price as of 2026-08-19) |
| Aug. 5, 2026 | MASS | S 10b5-1 | 20,000 | $8.49 | $169,800 | 823,359 Direct | -2.37% | Disposed | 17.7% (price as of 2026-08-19) |
| July 2, 2026 | MASS | S 10b5-1 | 2,200 | $9.02 | $19,844 | 843,359 Direct | -0.26% | Disposed | 10.8% (price as of 2026-08-19) |
| June 30, 2026 | MASS | S 10b5-1 | 20,000 | $8.84 | $176,800 | 845,559 Direct | -2.31% | Disposed | 13.0% (price as of 2026-08-19) |
| June 23, 2026 | MASS | S 10b5-1 | 9,900 | $9.04 | $89,496 | 865,559 Direct | -1.13% | Disposed | 10.5% (price as of 2026-08-19) |
| June 4, 2026 | MASS | S | 100 | $9.00 | $900 | 875,459 | — | — | 11.0% (price as of 2026-08-19) |
| June 3, 2026 | MASS | S | 20,000 | $8.73 | $174,600 | 875,559 | — | — | 14.4% (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 |
|---|---|---|---|---|---|---|---|
| Dec. 22, 2020 | MASS | Series D Preferred Stock | Common Stock, par value $0.001 (4,396) | — | — | 4,396 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 14 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| June 18, 2025 | MASS | Common Stock | 962,122 | Direct |
| June 18, 2025 | MASS | Stock Option (option to buy)→ Common Stock (114,318) | 114,318 | Direct |
| June 18, 2025 | MASS | Stock Option (option to buy)→ Common Stock (67,604) | 67,604 | Direct |
| June 18, 2025 | MASS | Stock Option (option to buy)→ Common Stock (33,400) | 33,400 | Direct |
| June 18, 2025 | MASS | Stock Option (option to buy)→ Common Stock (45,018) | 45,018 | Direct |
| June 18, 2025 | MASS | Stock Option (option to buy)→ Common Stock (60,064) | 60,064 | Direct |
| June 18, 2025 | MASS | Restricted Stock Units→ Common Stock (5,027) | 5,027 | Direct |
| June 18, 2025 | MASS | Restricted Stock Units→ Common Stock (14,836) | 14,836 | Direct |
| June 18, 2025 | MASS | Restricted Stock Units→ Common Stock (32,974) | 32,974 | Direct |
| Dec. 17, 2020 | MASS | Common Stock, par value $0.001 | 1,099,516 | Direct |
| Dec. 17, 2020 | MASS | Stock Option (option to buy)→ Common Stock, par value $0.001 (122,918) | 122,918 | Direct |
| Dec. 17, 2020 | MASS | Stock Option (option to buy)→ Common Stock, par value $0.001 (61,459) | 61,459 | Direct |
| Dec. 17, 2020 | MASS | Stock Option (option to buy)→ Common Stock, par value $0.001 (67,604) | 67,604 | Direct |
| Dec. 17, 2020 | MASS | Series D Preferred Stock→ Common Stock, par value $0.001 (4,396) | 4,396 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
MASS
Ph.D. Chief Product Officer| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2021 | $300,000 | $30,000 | — | — | $120,600 | — | $2,427 | $453,027 |
| 2020 | — | — | — | — | — | — | — | — |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.