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Oberweis Asset Management’s Rambus RMBS Stock Holding History

Oberweis Asset 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 		$45.3M Buy
526,316
+64,216
+14% +$6.41M 1.34% 10
2025
Q4 		$42.5M Sell
462,100
-45,799
-9% -$4.51M 1.55% 6
2025
Q3 		$52.9M Buy
507,899
+2,119
+0.4% +$163K 2.03% 3
2025
Q2 		$32.4M Sell
505,780
-1,570
-0.3% -$84.1K 1.41% 11
2025
Q1 		$26.3M Buy
507,350
+97,950
+24% +$5.75M 1.31% 11
2024
Q4 		$21.6M Buy
+409,400
New +$20.9M 1.02% 20

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

Oberweis Asset Management's RMBS Position: Q1 2026 in Review

Oberweis Asset Management increased its Rambus (RMBS) stake by 14% in Q1 2026, buying an estimated $6.41M and bringing the position to 526,316 shares worth $45.3M. The position accounts for 1.34% of the portfolio, ranked #10.

Oberweis Asset Management first reported a position in RMBS in Q4 2024 and has held it in 6 quarters since. The position peaked at $52.9M in Q3 2025. 553 funds tracked by Wall St. Rank hold RMBS as of Q1 2026.

  • Oberweis Asset Management held 526,316 shares of Rambus worth $45.3M as of Q1 2026.
  • Oberweis Asset Management bought 64,216 Rambus shares in Q1 2026, an estimated $6.41M.
  • Rambus made up 1.34% of Oberweis Asset Management's portfolio in Q1 2026, its #10 holding.
  • Oberweis Asset Management first reported a position in Rambus in Q4 2024 and has held it in 6 quarters since.
  • Oberweis Asset Management's Rambus position peaked at $52.9M in Q3 2025.
  • 553 funds tracked by Wall St. Rank held Rambus as of Q1 2026.

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