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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
Q2 		$745K Buy
+5,610
New +$730K 0.02% 254
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 $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Castleark Management's RMBS Position: Q2 2026 in Review

Castleark Management opened a new position in Rambus (RMBS) in Q2 2026: 5,610 shares worth $745K. The stake represents 0.02% of the portfolio and ranks #254 among its holdings. This is a return to the name: Castleark Management previously reported a position in RMBS as recently as Q4 2025.

Castleark Management first reported a position in RMBS in Q3 2013 and has held it in 16 quarters since. The position peaked at $11.5M in Q3 2025. 618 funds tracked by Wall St. Rank hold RMBS as of Q2 2026.

  • Castleark Management held 5,610 shares of Rambus worth $745K as of Q2 2026.
  • Rambus was a new Castleark Management position in Q2 2026.
  • Rambus made up 0.02% of Castleark Management's portfolio in Q2 2026, its #254 holding.
  • Castleark Management first reported a position in Rambus in Q3 2013 and has held it in 16 quarters since.
  • Castleark Management's Rambus position peaked at $11.5M in Q3 2025.
  • 618 funds tracked by Wall St. Rank held Rambus as of Q2 2026.

Based on Castleark Management's 13F filing for Q2 2026, filed 14 Aug 2026.