Constellium
CSTM
388 hedge funds and large institutions have $3.83B invested in Constellium in 2026 Q2 according to their latest regulatory filings, with 111 funds opening new positions, 146 increasing their positions, 111 reducing their positions, and 30 closing their positions.
270% more first-time investments, than exits
New positions opened: 111 | Existing positions closed: 30
107% more call options, than puts
Call options by funds: $50.3M | Put options by funds: $24.3M
32% more repeat investments, than reductions
Existing positions increased: 146 | Existing positions reduced: 111
24% more capital invested
Capital invested by funds: $3.08B → $3.83B (+$749M)
24% more funds holding
Funds holding: 314 → 388 (+74)
4.47% less ownership
Funds ownership: 93.29% → 88.82% (-4.5%)
9% less funds holding in top 10
Funds holding in top 10: 11 → 10 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Morgan Stanley
New York
|
+$96.4M |
| 2 |
American Century Companies
Kansas City,
Missouri
|
+$68.9M |
| 3 |
KPM
Kinetic Partners Management
Miami,
Florida
|
+$39.7M |
| 4 |
SIG
Senator Investment Group
New York
|
+$35M |
| 5 |
Marshall Wace
London,
United Kingdom
|
+$34.9M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
-$154M |
| 2 |
B
Bpifrance
Maisons Alfort, Cedex,
France
|
-$135M |
| 3 |
Millennium Management
New York
|
-$48.9M |
| 4 |
D.E. Shaw & Co
New York
|
-$33.4M |
| 5 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$31.6M |
CSTM Hedge Fund Activity: Q2 2026 in Review
388 of the 8,303 institutional investors tracked by Wall St. Rank reported a position in Constellium (CSTM) for Q2 2026, worth a combined $3.83B — up 24% from $3.08B a quarter earlier.
Buyers outnumbered sellers: 111 funds opened new CSTM positions and 30 closed out — a net gain of 81 holders — while 146 added to existing stakes and 111 trimmed.
The largest buyer was Morgan Stanley, adding an estimated $96.4M. The largest seller was Fidelity Investments, cutting an estimated $154M.
- 388 institutional investors held Constellium (CSTM) as of Q2 2026, up from 314 in Q1 2026.
- Funds reported $3.83B of Constellium stock for Q2 2026, up 24% quarter-over-quarter.
- 111 funds opened new Constellium positions in Q2 2026 and 30 closed out, a net change of +81 holders.
- The largest Constellium buyer in Q2 2026 was Morgan Stanley, an estimated $96.4M added.
- The largest Constellium seller in Q2 2026 was Fidelity Investments, an estimated $154M sold.
Based on aggregated 13F filings for Q2 2026.