Matthew David Sternberg is COO at Accelerant Holdings (ARX). They have made 1 open-market trade across 1 company since 2025, most recently 2026-07-27.
CIK 0002008628
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 $75K since 2025, never a sale. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ARX | 596,482 | $11.8M |
Shares reported on the most recent Form 4, priced at the 2026-07-27 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.