Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in CSTM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 13.0M | $318.7M | -5.6% | 9.522% | 0.01% |
| 2 | Bpifrance SA | 12.6M | $309.6M | 0.0% | 9.250% | 18.71% |
| 3 | FMR LLC | 7.0M | $171.1M | -34.1% | 5.113% | 0.01% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.9M | $96.5M | β | 2.884% | 0.01% |
| 5 | MILLENNIUM MANAGEMENT LLC | 3.5M | $85.3M | -44.6% | 2.549% | 0.06% |
| 6 | D. E. Shaw & Co., Inc. | 3.2M | $79.5M | +5.9% | 2.376% | 0.07% |
| 7 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 3.2M | $79.3M | +620.9% | 2.371% | 0.04% |
| 8 | MORGAN STANLEY | 3.2M | $78.6M | -14.3% | 2.347% | 0.00% |
| 9 | Nuveen, LLC | 2.8M | $69.5M | -0.5% | 2.077% | 0.02% |
| 10 | STATE STREET CORP | 2.8M | $67.9M | +3.9% | 2.030% | 0.00% |
| 11 | Encompass Capital Advisors LLC | 2.5M | $60.9M | -46.8% | 1.819% | 2.48% |
| 12 | AMERICAN CENTURY COMPANIES INC | 2.1M | $51.3M | +15.1% | 1.532% | 0.03% |
| 13 | AQR CAPITAL MANAGEMENT LLC | 2.1M | $51.0M | +17.5% | 1.524% | 0.02% |
| 14 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 2.1M | $50.5M | +894.4% | 1.510% | 0.08% |
| 15 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.9M | $47.0M | -1.6% | 1.405% | 0.08% |
| 16 | BRIGHTLINE CAPITAL MANAGEMENT, LLC | 1.8M | $45.4M | +0.3% | 1.357% | 13.43% |
| 17 | ALLIANCEBERNSTEIN L.P. | 2.3M | $43.7M | +1573.5% | 1.702% | 0.01% |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | 1.7M | $41.0M | +2.3% | 1.225% | 0.00% |
| 19 | WESTWOOD HOLDINGS GROUP INC | 1.4M | $34.4M | β | 1.029% | 0.25% |
| 20 | GOLDMAN SACHS GROUP INC | 1.4M | $33.7M | +0.3% | 1.008% | 0.00% |
| 21 | Kinetic Partners Management, LP | 1.3M | $32.3M | β | 0.964% | 1.81% |
| 22 | BEACONLIGHT CAPITAL, LLC | 1.2M | $28.8M | -12.6% | 0.861% | 16.24% |
| 23 | CITADEL ADVISORS LLC | 1.2M | $28.7M | +295.7% | 0.856% | 0.01% |
| 24 | Point72 Asset Management, L.P. | 1.0M | $24.7M | +216.0% | 0.738% | 0.03% |
| 25 | NORTHERN TRUST CORP | 978K | $24.0M | +3.8% | 0.718% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in CSTM β a direct measure of their conviction.
Filings activity in CSTM during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new CSTM position in Q1 2026
Institutions that fully closed their CSTM position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 302 | +23% | 56.84% | +12.32 pp | $2.76B | +28% |
| Q4 2025 | 246 | +7.9% | 44.52% | +8.71 pp | $2.16B | +24% |
| Q3 2025 | 228 | +5.1% | 35.81% | +4.92 pp | $1.74B | +16% |
| Q2 2025 | 217 | +0.9% | 30.89% | +8.38 pp | $1.50B | +37% |
| Q1 2025 | 215 | +0.5% | 22.51% | 0.59 pp | $1.09B | 2.6% |
| Q4 2024 | 214 | 1.4% | 23.10% | 15.20 pp | $1.12B | 40% |
| Q3 2024 | 217 | +0.0% | 38.30% | 5.61 pp | $1.86B | 13% |
| Q2 2024 | 217 | β | 43.91% | β | $2.13B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying CSTM stock.
Based on Q1 2026 13F filings, institutional ownership of Constellium SE stands at 56.8%, held across 302 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of CSTM, with approximately 12,964,203 shares worth $0.32B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of CSTM, including MILLENNIUM MANAGEMENT LLC, CITADEL ADVISORS LLC, Point72 Asset Management, L.P..
Our composite Smart Money Score for CSTM is 83 out of 100 (Strong Smart Money). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
84 institutions opened new positions in CSTM during Q1 2026, while 28 fully exited. 177 added to existing positions and 40 trimmed.
CSTM institutional ownership rose by 12.32 percentage points quarter-over-quarter, with a net change of +56 holders.
The top 10 institutions account for 49.2% of all reported 13F value in CSTM, and the top 25 account for 70.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Constellium SE (CSTM) Institutional Ownership