Constellium SE
CSTM- Exchange
- NYSE
- Industry
- Secondary Smelting & Refining of Nonferrous Metals
- SEC CIK
- 0001563411
In the last 90 days, Constellium SE insiders filed 1 open-market purchase and 0 sales; 389 institutions reported holding it in 13F filings for Q2 2026, worth $3.85B in total; no superinvestor holds it.
Holders of 5% or more of CSTM
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Constellium SE, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G | 5.80%8.27M shares | +0.80 ppfrom 5.00% | Apr 29, 20252 filings | Jul 17, 2025 | SEC |
| Millennium Management LLC | 13G | 5.30%7.45M shares | +1.60 ppfrom 3.70% | May 30, 20253 filings | Sep 16, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on Constellium SE, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 5, 20261:20 PM ET | FMR LLCand 1 other | 13G/A | 7.70%10.6M shares | – | Dec 31, 2025 | SEC |
| Sep 16, 20254:17 PM ET | Millennium Management LLCand 2 others | 13G | 5.30%7.45M shares | +1.60 ppfrom 3.70% | Sep 10, 2025 | SEC |
| Sep 8, 20251:36 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 4.50%6.27M shares | −5.50 ppfrom 10.00%Below 5% | Aug 31, 2025 | SEC |
| Aug 14, 202512:12 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 10.00%14.3M shares | −3.50 ppfrom 13.50% | Jun 30, 2025 | SEC |
| Aug 1, 20254:28 PM ET | Millennium Management LLCand 2 others | 13G/A | 3.70%5.12M shares | −1.40 ppfrom 5.10%Below 5% | Jun 30, 2025 | SEC |
| Jul 17, 20257:44 PM ET | BlackRock, Inc. | 13G | 5.80%8.27M shares | +0.80 ppfrom 5.00% | Jun 30, 2025 | SEC |
| May 30, 20254:06 PM ET | Millennium Management LLCand 2 others | 13G | 5.10%7.23M shares | New | May 28, 2025 | SEC |
| Apr 29, 202511:55 AM ET | BlackRock, Inc. | 13G/A | 5.00%7.17M shares | – | Mar 31, 2025 | SEC |
| Feb 14, 20259:45 AM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 13.50%19.8M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Constellium SE shares.
No Form 144 notices for Constellium SE are on file.