Mountaineer Partners Management
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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
Q3 		$12.1M Buy
500,246
+18,116
+4% +$502K 7.59% 6
2026
Q2 		$15.4M Sell
482,130
-176,360
-27% -$5.69M 11.18% 3
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 		$9.9M 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 $6.79T AUM 37.06% 1-Year Est. Return
Bpifrance
Bpifrance Maisons Alfort, Cedex, France $1.2B AUM 41.6% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM
American Century Companies
American Century Companies Kansas City, Missouri $229B AUM 33.35% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Nuveen
Nuveen Charlotte, North Carolina $420B AUM 34.97% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund Toronto, Ontario, Canada $64.4B AUM 36.06% 1-Year Est. Return
Brightline Capital Management
Brightline Capital Management Miami, Florida $247M AUM 101.7% 1-Year Est. Return

Mountaineer Partners Management's CSTM Position: Q3 2026 in Review

Mountaineer Partners Management increased its Constellium (CSTM) stake by 3.8% in Q3 2026, buying an estimated $502K and bringing the position to 500,246 shares worth $12.1M. The position accounts for 7.59% of the portfolio, ranked #6.

Mountaineer Partners Management first reported a position in CSTM in Q4 2018 and has held it in 29 quarters since. The position peaked at $16.2M in Q1 2026. 277 funds tracked by Wall St. Rank hold CSTM as of Q3 2026.

  • Mountaineer Partners Management held 500,246 shares of Constellium worth $12.1M as of Q3 2026.
  • Mountaineer Partners Management bought 18,116 Constellium shares in Q3 2026, an estimated $502K.
  • Constellium made up 7.59% of Mountaineer Partners Management's portfolio in Q3 2026, its #6 holding.
  • Mountaineer Partners Management first reported a position in Constellium in Q4 2018 and has held it in 29 quarters since.
  • Mountaineer Partners Management's Constellium position peaked at $16.2M in Q1 2026.
  • 277 funds tracked by Wall St. Rank held Constellium as of Q3 2026.

Based on Mountaineer Partners Management's 13F filing for Q3 2026, filed 9 Nov 2026.