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Castleark Management’s Alphatec Holdings ATEC Stock Holding History

Castleark Management’s Portfolio ATEC Stock Details ATEC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-296,160
Closed -$6.23M – 297
2025
Q4 		$6.23M Buy
+296,160
New +$5.48M 0.18% 135
2024
Q2 		– Sell
-112,340
Closed -$1.55M – 274
2024
Q1 		$1.55M Sell
112,340
-91,433
-45% -$1.36M 0.06% 191
2023
Q4 		$3.08M Sell
203,773
-172,597
-46% -$2.06M 0.14% 162
2023
Q3 		$4.88M Sell
376,370
-4,220
-1% -$66.1K 0.25% 96
2023
Q2 		$6.84M Buy
380,590
+146,030
+62% +$2.27M 0.31% 67
2023
Q1 		$3.66M Buy
+234,560
New +$3.32M 0.18% 126
2022
Q3 		– Sell
-142,982
Closed -$935K – 289
2022
Q2 		$935K Buy
+142,982
New +$1.32M 0.05% 190
2021
Q4 		– Sell
-411,475
Closed -$5.02M – 331
2021
Q3 		$5.02M Sell
411,475
-43,250
-10% -$603K 0.19% 124
2021
Q2 		$6.97M Sell
454,725
-11,230
-2% -$173K 0.23% 115
2021
Q1 		$7.36M Buy
465,955
+42,725
+10% +$672K 0.26% 104
2020
Q4 		$6.14M Buy
+423,230
New +$4.47M 0.23% 121

Other funds holding ATEC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Royal Bank of Canada
Royal Bank of Canada Toronto, Ontario, Canada $672B AUM 33.48% 1-Year Est. Return
BNP Paribas Asset Management
BNP Paribas Asset Management Paris, France $99.8B AUM 45.22% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Nuveen
Nuveen Charlotte, North Carolina $419B AUM 43.02% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

Castleark Management's ATEC Position: Q1 2026 in Review

Castleark Management sold out of Alphatec Holdings (ATEC) in Q1 2026, closing a stake of 296,160 shares — an estimated $6.23M sold.

Castleark Management first reported a position in ATEC in Q4 2020 and held it in 11 quarters. The position peaked at $7.36M in Q1 2021. 285 funds tracked by Wall St. Rank hold ATEC as of Q1 2026.

  • Castleark Management reported no remaining Alphatec Holdings position as of Q1 2026 after selling out during the quarter.
  • Castleark Management sold 296,160 Alphatec Holdings shares in Q1 2026, an estimated $6.23M.
  • Castleark Management first reported a position in Alphatec Holdings in Q4 2020 and held it in 11 quarters.
  • Castleark Management's Alphatec Holdings position peaked at $7.36M in Q1 2021.
  • 285 funds tracked by Wall St. Rank held Alphatec Holdings as of Q1 2026.

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