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Mountaineer Partners Management’s Constellium CSTM Stock Holding History

Mountaineer Partners Management’s Portfolio CSTM Stock Details CSTM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$16.2M Sell
658,490
-22,974
-3% -$547K 8.04% 2
2025
Q4 		$12.8M Sell
681,464
-152,312
-18% -$2.53M 7.19% 6
2025
Q3 		$12.4M Sell
833,776
-11,906
-1% -$170K 7.22% 4
2025
Q2 		$11.2M Buy
845,682
+303,614
+56% +$3.41M 7.43% 5
2025
Q1 		$5.47M Sell
542,068
-345,171
-39% -$3.67M 5.23% 11
2024
Q4 		$9.11M Buy
887,239
+338,105
+62% +$4.16M 6.67% 8
2024
Q3 		$8.93M Buy
549,134
+48,365
+10% +$820K 5.57% 12
2024
Q2 		$9.44M Sell
500,769
-53,273
-10% -$1.11M 4.91% 10
2024
Q1 		$12.2M Sell
554,042
-55,768
-9% -$1.08M 5.66% 6
2023
Q4 		$12.2M Buy
609,810
+35,861
+6% +$628K 6.19% 6
2023
Q3 		$10.4M Buy
573,949
+171
+0% +$3.02K 6.7% 4
2023
Q2 		$9.87M Buy
573,778
+76,423
+15% +$1.17M 5.44% 8
2023
Q1 		$7.6M Buy
+497,355
New +$7.24M 5.52% 7
2022
Q2 		– Sell
-338,297
Closed -$6.09M – 13
2022
Q1 		$6.09M Sell
338,297
-261,528
-44% -$4.77M 3.35% 12
2021
Q4 		$10.7M Sell
599,825
-6,868
-1% -$126K 5.84% 10
2021
Q3 		$11.4M Buy
606,693
+13,463
+2% +$259K 7.44% 5
2021
Q2 		$11.2M Sell
593,230
-234,200
-28% -$4.04M 8.19% 3
2021
Q1 		$12.2M Sell
827,430
-47,722
-5% -$685K 8.52% 1
2020
Q4 		$12.2M Sell
875,152
-116,400
-12% -$1.32M 8.79% 1
2020
Q3 		$7.78M Buy
991,552
+584,900
+144% +$4.83M 6.72% 6
2020
Q2 		$3.12M Sell
406,652
-487,800
-55% -$3.54M 4.19% 12
2020
Q1 		$4.66M Buy
894,452
+238,384
+36% +$2.56M 6.63% 7
2019
Q4 		$8.79M Sell
656,068
-33,400
-5% -$461K 9.79% 4
2019
Q3 		$8.76M Sell
689,468
-435,600
-39% -$5.13M 8.82% 4
2019
Q2 		$11.3M Buy
1,125,068
+66,200
+6% +$613K 5.21% 6
2019
Q1 		$8.45M Buy
1,058,868
+12,100
+1% +$103K 7.21% 8
2018
Q4 		$7.32M Buy
+1,046,768
New +$9.31M 6.22% 9

Other funds holding CSTM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
B
Bpifrance Maisons Alfort, Cedex, France $1.65B AUM 19.85% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $185B AUM 39.58% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

Mountaineer Partners Management's CSTM Position: Q1 2026 in Review

Mountaineer Partners Management reduced its Constellium (CSTM) stake by 3.4% in Q1 2026, selling an estimated $547K and leaving 658,490 shares worth $16.2M. The position accounts for 8.04% of the portfolio, ranked #2.

Mountaineer Partners Management first reported a position in CSTM in Q4 2018 and has held it in 27 quarters since. 313 funds tracked by Wall St. Rank hold CSTM as of Q1 2026.

  • Mountaineer Partners Management held 658,490 shares of Constellium worth $16.2M as of Q1 2026.
  • Mountaineer Partners Management sold 22,974 Constellium shares in Q1 2026, an estimated $547K.
  • Constellium made up 8.04% of Mountaineer Partners Management's portfolio in Q1 2026, its #2 holding.
  • Mountaineer Partners Management first reported a position in Constellium in Q4 2018 and has held it in 27 quarters since.
  • 313 funds tracked by Wall St. Rank held Constellium as of Q1 2026.

Based on Mountaineer Partners Management's 13F filing for Q1 2026, filed 15 May 2026.