Matthew Charles Brown is CFO at Altair Engineering Inc. (ALTR). They have made 12 open-market trades across 4 companies since 2019, most recently 2026-08-21.
CIK 0001766979
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
1 open-market purchase totalling $258K since 2026, against 11 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ALTR | 66,125 | $7.4M |
| NLOK | 114,675 | $2.5M |
| SYMC | 87,548 | $2.1M |
| TENB | 47,010 | $1.8M |
| Total | $13.7M |
Shares reported on the most recent Form 4, priced at the 2026-08-25 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TENB | BUY | 2026-05-04 | 2026-05-05 | $21.54 | $258K | -0.1% | +36.2% | +62.5% |
| ALTR | SELL | 2025-03-03 | 2025-03-05 | $111.45 | $165K | +0.2% | N/A | N/A |
| ALTR | SELL | 2025-02-26 | 2025-02-27 | $111.53 | $850K | -0.1% | N/A | N/A |
| ALTR | SELL | 2024-12-23 | 2024-12-26 | $108.90 | $228K | +1.3% | +1.3% | N/A |
| ALTR | SELL | 2024-03-04 | 2024-03-05 | $85.32 | $151K | -4.8% | +0.5% | +4.2% |
| ALTR | SELL | 2024-02-28 | 2024-02-29 | $83.65 | $730K | -3.7% | +0.2% | +5.2% |
| ALTR | SELL | 2023-03-01 | 2023-03-03 | $63.84 | $422K | +2.1% | +8.5% | +14.2% |
| ALTR | SELL | 2022-03-07 | 2022-03-09 | $64.55 | $297K | -1.0% | -6.9% | -13.0% |
| NLOK | SELL | 2020-08-17 | 2020-08-18 | $22.94 | $12K | +4.9% | -8.9% | -16.5% |
| NLOK | SELL | 2020-08-11 | 2020-08-12 | $22.63 | $1.4M | +4.5% | -5.9% | -13.8% |
| NLOK | SELL | 2019-08-16 | 2020-06-02 | $21.39 | $56K | -5.2% | -4.4% | +12.3% |
| SYMC | SELL | 2019-03-07 | 2019-03-08 | $21.90 | $236K | +5.3% | +10.3% | -13.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.