Constellium
CSTM
314 hedge funds and large institutions have $3.08B invested in Constellium in 2026 Q1 according to their latest regulatory filings, with 87 funds opening new positions, 113 increasing their positions, 85 reducing their positions, and 22 closing their positions.
295% more first-time investments, than exits
New positions opened: 87 | Existing positions closed: 22
33% more repeat investments, than reductions
Existing positions increased: 113 | Existing positions reduced: 85
32% more capital invested
Capital invested by funds: $2.34B → $3.08B (+$738M)
24% more funds holding
Funds holding: 253 → 314 (+61)
12% more call options, than puts
Call options by funds: $31.3M | Put options by funds: $27.9M
10% more funds holding in top 10
Funds holding in top 10: 10 → 11 (+1)
3.09% more ownership
Funds ownership: 90.2% → 93.29% (+3.1%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$66.2M |
| 2 |
AllianceBernstein
Nashville,
Tennessee
|
+$51.8M |
| 3 |
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
Toronto,
Ontario, Canada
|
+$44M |
| 4 |
WHG
Westwood Holdings Group
Dallas,
Texas
|
+$33.3M |
| 5 |
KPM
Kinetic Partners Management
Miami,
Florida
|
+$31.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
-$85.8M |
| 2 |
Millennium Management
New York
|
-$66.6M |
| 3 |
NTCM
Nut Tree Capital Management
New York
|
-$60.8M |
| 4 |
ECA
Encompass Capital Advisors
New York
|
-$51.9M |
| 5 |
Capstone Investment Advisors
New York
|
-$22.5M |
CSTM Hedge Fund Activity: Q1 2026 in Review
314 institutional investors reported a position in Constellium (CSTM) for Q1 2026, worth a combined $3.08B — up 32% from $2.34B a quarter earlier.
Buyers outnumbered sellers: 87 funds opened new CSTM positions and 22 closed out — a net gain of 65 holders — while 113 added to existing stakes and 85 trimmed.
The largest buyer was Arrowstreet Capital, adding an estimated $66.2M. The largest seller was Fidelity Investments, cutting an estimated $85.8M.
- 314 institutional investors held Constellium (CSTM) as of Q1 2026, up from 253 in Q4 2025.
- Funds reported $3.08B of Constellium stock for Q1 2026, up 32% quarter-over-quarter.
- 87 funds opened new Constellium positions in Q1 2026 and 22 closed out, a net change of +65 holders.
- The largest Constellium buyer in Q1 2026 was Arrowstreet Capital, an estimated $66.2M added.
- The largest Constellium seller in Q1 2026 was Fidelity Investments, an estimated $85.8M sold.
Based on aggregated 13F filings for Q1 2026.