Jing L. Marantz is CHIEF MEDICAL OFFICER at Scholar Rock Holding Corp (SRRK). They have made 3 open-market trades across 1 company since 2024, most recently 2026-02-17.
CIK 0001834528
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.
0 open-market purchases, against 3 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| SRRK | 126,012 | $5.0M |
| ARCT | 3,131 | $32K |
| Total | $5.1M |
Shares reported on the most recent Form 4, priced at the 2026-02-19 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 |
|---|---|---|---|---|---|---|---|---|
| SRRK | SELL | 2026-02-17 | 2026-02-19 | $46.53 | $193K | -6.5% | -7.9% | +2.1% |
| SRRK | SELL | 2026-01-16 | 2026-01-21 | $44.48 | $258K | +1.6% | +4.7% | +4.9% |
| SRRK | SELL | 2025-01-16 | 2025-01-21 | $44.20 | $500K | -10.1% | -12.8% | -33.6% |
| SRRK | SELL · 10b5-1 | 2024-11-22 | 2024-11-26 | $36.60 | $503K | +22.7% | +23.4% | +0.2% |
| SRRK | SELL · 10b5-1 | 2024-11-11 | 2024-11-13 | $30.00 | $63K | +37.6% | +53.1% | +35.0% |
| SRRK | SELL · 10b5-1 | 2024-10-07 | 2024-10-07 | $27.21 | $6.0M | -11.6% | -10.5% | +29.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.