Briggs Morrison is President at Syndax Pharmaceuticals Inc (SNDX). They have made 24 open-market trades across 4 companies since 2019, most recently 2026-06-24.
CIK 0001654430
8 open-market purchases totalling $1.2M since 2019, against 16 sales. Across 8 scored buys the stock is up 14.9% at ninety days, and 8.9 points ahead of the S&P over the same stretch.
8 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| ARVN | 111,548 | $776K |
| SNDX | 34,836 | $450K |
| RPTX | 4,800 | $13K |
| CARM | 12,175 | $2K |
| CDAK | 4,761 | $271 |
| Total | $1.2M |
Shares reported on the most recent Form 4, priced at the 2026-06-26 close.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 38% | 63% | 50% |
| Avg Move | -2.9% | -0.4% | +14.9% |
| Alpha | -4.3% | -2.6% | +8.9% |
| Scored | 8 | 8 | 8 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ARVN | BUY | 2026-03-06 | 2026-03-09 | $13.40 | $268K | -22.0% | -21.7% | -50.2% |
| ARVN | BUY | 2025-09-22 | 2025-09-24 | $7.57 | $227K | +24.6% | +19.3% | +57.8% |
| SNDX | SELL | 2023-08-09 | 2023-08-10 | $18.27 | $1.9M | +2.7% | -4.8% | -22.7% |
| SNDX | SELL · 10b5-1 | 2023-07-10 | 2023-07-11 | $20.40 | $1.1M | +3.8% | -10.3% | -39.0% |
| SNDX | SELL | 2023-06-09 | 2023-06-09 | $21.18 | $2.2M | -0.2% | -5.1% | -15.5% |
| SNDX | SELL | 2023-05-09 | 2023-05-10 | $21.41 | $2.3M | +10.5% | +5.0% | -9.4% |
| SNDX | SELL | 2023-04-10 | 2023-04-12 | $19.53 | $2.1M | +8.6% | +7.6% | +3.6% |
| SNDX | SELL | 2023-03-13 | 2023-03-14 | $22.53 | $2.4M | -2.9% | -9.1% | -6.7% |
| SNDX | SELL | 2023-02-06 | 2023-02-08 | $26.83 | $2.8M | -0.9% | -14.1% | -16.5% |
| SNDX | SELL | 2022-09-19 | 2022-09-21 | $23.11 | $8.0M | +4.6% | +2.1% | +2.8% |
| SNDX | SELL | 2022-09-14 | 2022-09-16 | $23.51 | $9.5M | +7.1% | +4.3% | +5.7% |
| SNDX | SELL | 2022-07-01 | 2022-07-05 | $19.00 | $1.2M | -6.1% | +12.0% | +19.0% |
| ARVN | SELL | 2022-04-14 | 2022-04-18 | $66.44 | $2.8M | -12.9% | -33.7% | -26.4% |
| SNDX | SELL | 2022-04-01 | 2022-04-05 | $17.48 | $3.6M | -8.1% | -11.2% | +8.9% |
| ARVN | SELL | 2022-01-14 | 2022-01-19 | $65.31 | $2.4M | +10.2% | +6.4% | +2.4% |
| SNDX | SELL | 2021-12-17 | 2021-12-20 | $20.00 | $703K | +2.8% | -22.4% | -20.4% |
| SNDX | SELL | 2021-09-17 | 2021-09-21 | $20.07 | $2.8M | +5.1% | +0.4% | +13.8% |
| CDAK | BUY | 2021-02-17 | 2021-02-17 | $21.00 | $100K | -17.8% | -26.4% | -18.5% |
| SNDX | SELL | 2021-02-08 | 2021-02-10 | $20.55 | $1.4M | +3.7% | +6.5% | -25.4% |
| SNDX | SELL | 2020-11-09 | 2020-11-12 | $20.04 | $3.2M | +7.6% | +22.8% | +3.6% |
| RPTX | BUY | 2020-06-23 | 2020-06-25 | $20.00 | $96K | -14.8% | -34.0% | -0.8% |
| ARVN | BUY | 2020-03-24 | 2020-03-25 | $38.18 | $95K | +2.0% | +25.5% | -19.4% |
| SNDX | BUY | 2020-02-04 | 2020-02-05 | $8.00 | $100K | -2.3% | +16.7% | +75.6% |
| SNDX | BUY | 2019-10-10 | 2019-10-11 | $5.40 | $119K | +9.2% | +12.8% | +43.0% |
| SNDX | BUY | 2019-05-09 | 2019-05-13 | $7.46 | $152K | -2.5% | +4.7% | +32.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.