CM
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Castleark Management’s Plug Power PLUG Stock Holding History

Castleark Management’s Portfolio PLUG Stock Details PLUG Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-728,110
Closed -$1.7M – 324
2025
Q3 		$1.7M Buy
+728,110
New +$1.23M 0.05% 204
2022
Q2 		– Sell
-20,510
Closed -$587K – 334
2022
Q1 		$587K Sell
20,510
-24,165
-54% -$576K 0.03% 235
2021
Q4 		$1.26M Sell
44,675
-9,120
-17% -$316K 0.05% 217
2021
Q3 		$1.37M Buy
53,795
+42,485
+376% +$1.14M 0.05% 210
2021
Q2 		$387K Sell
11,310
-206,295
-95% -$5.99M 0.01% 268
2021
Q1 		$7.8M Sell
217,605
-130,865
-38% -$6.75M 0.28% 103
2020
Q4 		$11.8M Buy
348,470
+214,510
+160% +$4.86M 0.44% 49
2020
Q3 		$1.8M Buy
+133,960
New +$1.48M 0.07% 191

Other funds holding PLUG

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return
Jane Street
Jane Street New York $777B AUM 61.18% 1-Year Est. Return

Castleark Management's PLUG Position: Q4 2025 in Review

Castleark Management sold out of Plug Power (PLUG) in Q4 2025, closing a stake of 728,110 shares — an estimated $1.7M sold.

Castleark Management first reported a position in PLUG in Q3 2020 and held it in 8 quarters. The position peaked at $11.8M in Q4 2020. 457 funds tracked by Wall St. Rank hold PLUG as of Q4 2025.

  • Castleark Management reported no remaining Plug Power position as of Q4 2025 after selling out during the quarter.
  • Castleark Management sold 728,110 Plug Power shares in Q4 2025, an estimated $1.7M.
  • Castleark Management first reported a position in Plug Power in Q3 2020 and held it in 8 quarters.
  • Castleark Management's Plug Power position peaked at $11.8M in Q4 2020.
  • 457 funds tracked by Wall St. Rank held Plug Power as of Q4 2025.

Based on Castleark Management's 13F filing for Q4 2025, filed 13 Feb 2026.