60 form 4 filings landed today. 6 tickers with cluster buys (3+ insiders filing on the same day). 54 singleton filings, most from unknown CIK-only issuers.

cluster buys

• \(PRTA** (prothena corporation plc) -- 12 filers. [link](https://www.sec.gov/Archives/edgar/data/1559053/000090514826002471/0000905148-26-002471-index.htm) - **\)DRS (leonardo drs, inc.) – 8 filers. link

• \(ARX** (archer aviation inc.) -- 5 filers. [link](https://www.sec.gov/Archives/edgar/data/1997350/000162828026035780/0001628280-26-035780-index.htm) - **\)PSQH-WT (psq holdings, inc. warrants) – 3 filers. link

• \(SE** (sea limited) -- 3 filers. [link](https://www.sec.gov/Archives/edgar/data/1703399/000119312526227824/0001193125-26-227824-index.htm) - **\)SILC (silicom ltd) – 3 filers. link

singletons of note

no ceo or cfo solo buys identified in today’s singleton set. most singleton filings are from unknown issuers (cik-only tickers) or lack executive role data in the raw feed.

closing thought

the cluster pattern today skews heavily toward biotech (\(PRTA, 12 filers) and defense/aerospace (\)DRS, 8 filers). \(ARX (eVTOL aviation) with 5 filers is an outlier in a sector that rarely sees insider clusters. warrants (\)PSQH-WT) and tech ($SE, $SILC) round out the rest. no financial sector clusters at all.

more at falsifylab.substack.com

Originally published on FalsifyLab Substack.

— research and educational content. not investment, legal, or tax advice. do your own research. positions and views may change without notice.