Patrick J Heron bought $12.0M of MBX Biosciences (MBX)

Executed Sep 26 2025, disclosed Sep 30 2025, 4 days later.

Value, as filed

$12.0M

666,666 sh × $18.00

Executed

Sep 26 2025

the trade date, as filed

Disclosed

Sep 30 2025

4 days after the trade

Return, 21 sessionsiFrom the disclosed entry session; derived

+0.1%

-0.3% from execution

Over the 21 trading sessions from the disclosed entry session (Sep 30 2025), the stock returned +0.1% (delay-adjusted); from the execution session (Sep 26 2025), -0.3%. Derived: entry at the session's open, exit at the close 20 sessions later.

The filer

PH Patrick J Heron Director profile →

Patrick J Heron (Director) filed 1 Form 4 report in the trailing twelve months (1 purchase, 0 sales), most often in MBX. Across 1 priced purchase filing, the average 21-session return was +10.0% from execution and +12.1% from disclosure (delay-adjusted; derived). The largest single filing was $9.0M of MIRM (131,425 sh × $68.48, as filed), executed Jan 23.

The name

MBX MBX MBX · 8 filings in 24 months ticker → Insider filings, newest first→ View the original filing at www.sec.gov→