Jane Street
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Jane Street’s Rambus RMBS Stock Holding History

Jane Street’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 		$62M Buy
467,400
+414,300
+780% +$53.9M 0.01% 1248
2026
Q1 		$4.57M Buy
53,100
+9,600
+22% +$958K ﹤0.01% 3651
2025
Q4 		$4M Sell
43,500
-35,000
-45% -$3.44M ﹤0.01% 3588
2025
Q3 		$8.18M Buy
78,500
+15,500
+25% +$1.19M ﹤0.01% 2681
2025
Q2 		$4.03M Sell
63,000
-25,200
-29% -$1.35M ﹤0.01% 3317
2025
Q1 		$4.57M Buy
88,200
+3,700
+4% +$217K ﹤0.01% 3067
2024
Q4 		$4.47M Buy
84,500
+55,900
+195% +$2.85M ﹤0.01% 2821
2024
Q3 		$1.21M Buy
28,600
+24,800
+653% +$1.2M ﹤0.01% 5506
2024
Q2 		$223K Sell
3,800
-1,500
-28% -$85.7K ﹤0.01% 8225
2024
Q1 		$328K Sell
5,300
-5,600
-51% -$354K ﹤0.01% 7418
2023
Q4 		$744K Sell
10,900
-2,100
-16% -$131K ﹤0.01% 6105
2023
Q3 		$725K Sell
13,000
-10,500
-45% -$596K ﹤0.01% 5661
2023
Q2 		$1.51M Buy
23,500
+7,000
+42% +$385K ﹤0.01% 4592
2023
Q1 		$846K Buy
16,500
+10,500
+175% +$451K ﹤0.01% 5332
2022
Q4 		$215K Sell
6,000
-9,500
-61% -$321K ﹤0.01% 7558
2022
Q3 		$394K Buy
+15,500
New +$388K ﹤0.01% 7130
2022
Q2 		– Sell
-58,800
Closed -$1.88M – 10687
2022
Q1 		$1.88M Buy
58,800
+37,400
+175% +$1.04M ﹤0.01% 4875
2021
Q4 		$629K Buy
21,400
+5,300
+33% +$135K ﹤0.01% 6825
2021
Q3 		$357K Sell
16,100
-300
-2% -$7.06K ﹤0.01% 7861
2021
Q2 		$389K Sell
16,400
-8,100
-33% -$163K ﹤0.01% 7713
2021
Q1 		$476K Buy
+24,500
New +$492K ﹤0.01% 6887

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

Jane Street's RMBS Position: Q2 2026 in Review

Jane Street increased its Rambus (RMBS) stake by 1,651% in Q2 2026, buying an estimated $11.7M and bringing the position to 95,013 shares worth $12.6M. The position accounts for ﹤0.01% of the portfolio, ranked #2585.

Jane Street first reported a position in RMBS in Q2 2013 and has held it in 31 quarters since. The position peaked at $20.1M in Q3 2025. 618 funds tracked by Wall St. Rank hold RMBS as of Q2 2026.

  • Jane Street held 95,013 shares of Rambus worth $12.6M as of Q2 2026.
  • Jane Street bought 89,587 Rambus shares in Q2 2026, an estimated $11.7M.
  • Rambus made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #2585 holding.
  • Jane Street first reported a position in Rambus in Q2 2013 and has held it in 31 quarters since.
  • Jane Street's Rambus position peaked at $20.1M in Q3 2025.
  • 618 funds tracked by Wall St. Rank held Rambus as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.