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Castleark Management’s Rambus RMBS Stock Holding History

Castleark Management’s Portfolio RMBS Stock Details RMBS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-95,578
Closed -$8.78M – 334
2025
Q4 		$8.78M Sell
95,578
-15,260
-14% -$1.5M 0.26% 81
2025
Q3 		$11.5M Sell
110,838
-3,862
-3% -$298K 0.32% 53
2025
Q2 		$7.34M Sell
114,700
-3,400
-3% -$182K 0.22% 81
2025
Q1 		$6.11M Sell
118,100
-21,790
-16% -$1.28M 0.21% 94
2024
Q4 		$7.39M Buy
+139,890
New +$7.13M 0.26% 81
2024
Q2 		– Sell
-50,710
Closed -$3.13M – 301
2024
Q1 		$3.13M Sell
50,710
-59,830
-54% -$3.79M 0.13% 157
2023
Q4 		$7.54M Sell
110,540
-58,220
-34% -$3.63M 0.33% 61
2023
Q3 		$9.42M Buy
168,760
+19,060
+13% +$1.08M 0.48% 34
2023
Q2 		$9.61M Buy
149,700
+83,430
+126% +$4.59M 0.44% 45
2023
Q1 		$3.4M Buy
+66,270
New +$2.85M 0.17% 133
2021
Q2 		– Sell
-318,055
Closed -$6.18M – 356
2021
Q1 		$6.18M Buy
+318,055
New +$6.39M 0.22% 122
2014
Q4 		– Sell
-343,377
Closed -$3.69M – 387
2014
Q3 		$3.69M Sell
343,377
-190,925
-36% -$2.41M 0.1% 185
2014
Q2 		$7.64M Buy
534,302
+190,925
+56% +$2.36M 0.21% 109
2014
Q1 		$3.69M Buy
+343,377
New +$3.22M 0.1% 185
2013
Q4 		– Sell
-694,887
Closed -$8.67M – 373
2013
Q3 		$8.67M Buy
+694,887
New +$6.36M 0.24% 109

Other funds holding RMBS

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
EIG
EdgePoint Investment Group Toronto, Ontario, Canada $12.5B AUM 31.7% 1-Year Est. Return

Castleark Management's RMBS Position: Q1 2026 in Review

Castleark Management sold out of Rambus (RMBS) in Q1 2026, closing a stake of 95,578 shares — an estimated $8.78M sold.

Castleark Management first reported a position in RMBS in Q3 2013 and held it in 15 quarters. The position peaked at $11.5M in Q3 2025. 553 funds tracked by Wall St. Rank hold RMBS as of Q1 2026.

  • Castleark Management reported no remaining Rambus position as of Q1 2026 after selling out during the quarter.
  • Castleark Management sold 95,578 Rambus shares in Q1 2026, an estimated $8.78M.
  • Castleark Management first reported a position in Rambus in Q3 2013 and held it in 15 quarters.
  • Castleark Management's Rambus position peaked at $11.5M in Q3 2025.
  • 553 funds tracked by Wall St. Rank held Rambus as of Q1 2026.

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