Armstrong Mac sold $484K of PLMR (indirect holdings)
Armstrong Mac (CEO and Chairman) sold 3,500 indirectly-held shares of Palomar Holdings, Inc. (PLMR) at an average of $138.31 ($137.60–$139.25, $0.48M total) across 3 trades on 2026-10-21 under a Rule 10b5-1 trading plan.
How this was made
The 30-second read
Why it matters
The disclosed sale is small relative to market cap, likely causing only minor price movement.
Market read
A routine insider sale with limited trading relevance.
What to watch
Potential upcoming corporate actions or financing needs not disclosed in the filing.
Background
SEC Form 4 filing discloses insider transactions for public companies.
Ticker impact
CEO Armstrong Mac sold 3,500 PLMR shares for $484,097 via a 10b5-1 plan, reducing his stake to 315,388 shares.
likely slight downward pressure as the market prices in the insider sell.
The transaction size is modest ($0.5M) and disclosed via a Form 4, so impact is limited but may signal short‑term weakness.
Market effects
Minimal effect on the broader biotech sector.
No regional impact.
Limited to PLMR investors.
Counterpoint
The sale could be routine under a pre‑arranged plan and not indicate any negative fundamentals.
Key entities
- CompanyPalomar Holdings, Inc.
Biotech firm listed on NASDAQ under ticker PLMR.
- PersonArmstrong Mac
CEO and Chairman of Palomar Holdings.


