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Company · CSTM

Constellium SE

Name as listed on its exchange; filed with the SEC as CONSTELLIUM SE.

Nasdaq's symbol directory lists CSTM on the New York Stock Exchange as “Constellium SE Ordinary Shares (France)”.

In the 12 months to Nov 8, 2026: insiders bought on 2 occasions ($83K); 1 filing by holders of 5% or more; 1 company report (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider purchases and sales, by month (last 12 months)Insider purchases: $83K in total; Insider sales: $0 in total.Aug: Insider purchases $41KNov: Insider purchases $42KDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $83KInsider sales below: $0
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Jean-Christophe Deslarzes bought on 2 days latest Nov 2, 2026 bought $83K
Every trade (2)
  1. BUYJean-Christophe Deslarzes bought Nov 2, 2026 1,800 shares filing $42K
  2. BUYJean-Christophe Deslarzes bought Aug 3, 2026 1,490 shares filing $41K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. FMR LLC filed Aug 6, 2026 Schedule 13G/A passive 2,194,722 shares filing 1.6%

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Results of operations and financial condition filing Oct 28, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.