Thomas C. Chow is CLO & Secretary at PubMatic, Inc. (PUBM). They have made 12 open-market trades across 2 companies since 2021, most recently 2026-09-04.
CIK 0001834012
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 $10K since 2026, against 11 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| PUBM | 4,910 | $82K |
| MSTR | 11 | $2K |
| Total | $83K |
Shares reported on the most recent Form 4, priced at the 2026-06-17 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 |
|---|---|---|---|---|---|---|---|---|
| MSTR | SELL | 2026-09-04 | 2026-09-08 | $138.75 | $15K | +8.5% | +6.8% | — |
| MSTR | BUY | 2026-06-16 | 2026-06-17 | $90.07 | $10K | -26.1% | -19.4% | +10.2% |
| PUBM | SELL | 2022-07-05 | 2022-07-07 | $15.28 | $7K | -4.5% | +7.6% | +12.4% |
| PUBM | SELL | 2022-07-01 | 2022-07-05 | $15.87 | $5K | -7.4% | +5.2% | +4.4% |
| PUBM | SELL | 2022-06-01 | 2022-06-03 | $20.30 | $259K | -8.2% | -18.7% | -7.8% |
| PUBM | SELL | 2022-05-17 | 2022-05-19 | $21.74 | $435K | -14.2% | -20.5% | -1.3% |
| PUBM | SELL | 2022-04-04 | 2022-04-04 | $27.74 | $24K | -12.6% | -13.7% | -40.0% |
| PUBM | SELL | 2022-03-04 | 2022-03-08 | $21.82 | $109K | +10.1% | +20.7% | -6.8% |
| PUBM | SELL · 10b5-1 | 2021-12-02 | 2021-12-03 | $37.57 | $24K | -1.4% | -6.8% | -33.0% |
| PUBM | SELL | 2021-11-26 | 2021-11-30 | $37.80 | $5.0M | -3.7% | -13.6% | -23.7% |
| PUBM | SELL | 2021-11-10 | 2021-11-12 | $39.51 | $739K | -1.6% | -12.1% | -26.8% |
| PUBM | SELL · 10b5-1 | 2021-10-01 | 2021-10-04 | $25.36 | $20K | +18.8% | +25.2% | +40.2% |
| PUBM | SELL | 2021-07-01 | 2021-07-02 | $36.77 | $372K | -14.8% | -15.9% | -26.3% |
| PUBM | SELL | 2021-06-01 | 2021-06-03 | $30.07 | $1.0M | +18.7% | +25.4% | +4.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.