CSTM — Insider Trading Activity
One insider at CSTM put personal money into the stock on the open market this window, led by a Director, with nobody selling.
What this means for CSTM
CSTM is not showing a cluster buy or a step-change versus its own baseline, so what the window amounts to is a single insider acting alone. Who is buying. The most credible buyer in this window is a Director (< $100K), growing their stake by 4%. That insider’s track record: past buys beat the S&P 500 0 of 1 time (avg −11% vs S&P over 6 mo). Overall credibility score: 11/100 (Low).
By the numbers. One insider filed 1 open-market purchase at CSTM over the window, 1,490 shares in all at an average of $27.24 a share, most recently on August 3, 2026. No insider sold CSTM stock on the open market in that period.
How we read these filings — which transaction codes count, how the cluster and credibility thresholds are set, and what the signals have and haven’t predicted — is written up in the insider trading methodology.
CSTM insider filings, one by one
The single Form 4 filing from the last 90 days, with share count, dollar amount and date.
Other tickers with the same signal
Companies of a comparable size whose Form 4 filings tripped the same insider buying flag as CSTM in this window.
- EP insider trading — 2 buyers, 1 seller, credibility 10/100
- CLNE insider trading — 1 buyer, credibility 20/100
- CNP insider trading — 1 buyer, credibility 11/100
- ANIK insider trading — 1 buyer, credibility 12/100
- FLD insider trading — 1 buyer, 4 sellers, credibility 6/100