Rambus Ownership | Who Owns Rambus?

Overview Forecast RevenueFinancials Chart Transcripts

Rambus Ownership Summary

Rambus is owned by 67.60% institutional investors, 0.78% insiders, and 31.62% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 15.11% of RMBS shares. iShares Core S&P Mid-Cap ETF is the top mutual fund, with 3.22% of its assets in Rambus shares.

RMBS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Rambus	67.60%	0.78%	31.62%
Sector	Technology Stocks	35.28%	13.10%	51.62%
Idea	Semiconductor Stocks List	60.61%	7.19%	32.20%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	16.28M	15.11%	$1.50B
Blackrock	15.79M	14.60%	$927.60M
Vanguard group	12.29M	11.41%	$1.13B
Price t rowe associates inc /md/	5.25M	4.88%	$546.57M
State street	4.39M	4.09%	$457.44M
Geode capital management	2.84M	2.64%	$261.26M
Edgepoint investment group	2.68M	2.50%	$279.56M
Invesco	2.43M	2.26%	$253.42M
Jpmorgan chase	2.07M	1.92%	$189.78M
Dimensional fund advisors lp	1.89M	1.76%	$174.01M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Aspetuck financial management	38.17K	2.36%	$3.51M
Edgepoint investment group	2.68M	2.09%	$279.56M
Amj financial wealth management	94.95K	2.06%	$8.72M
Oberweis asset management inc/	507.90K	2.03%	$52.92M
Emerald advisers	626.99K	1.77%	$57.61M
Emerald mutual fund advisers trust	391.21K	1.75%	$35.95M
Aurora investment counsel	23.60K	1.29%	$2.46M
Mesirow institutional investment management	298.17K	1.21%	$15.76M
Tairen capital	103.07K	1.16%	$10.74B
Gould capital	18.39K	1.04%	$1.69M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	1.70M	0.02%	1.70M
Alliancebernstein	1.82M	0.06%	1.55M
Fmr	1.37M	0.01%	1.04M
Rafferty asset management	901.75K	0.30%	901.75K
Price t rowe associates inc /md/	5.25M	0.06%	551.95K

Top Sellers

Holder	Shares	% Assets	Change
Westwood group	235.06K	0.17%	-1.50M
Park west asset management	-	-	-660.00K
Analog century management lp	-	-	-631.34K
Vaughan nelson investment management	-	-	-562.81K
Voloridge investment management	-	-	-551.77K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.70M	0.02%	1.70M	$156.36M
Rafferty asset management	901.75K	0.30%	901.75K	$93.96M
Point72 asset management	166.67K	0.03%	166.67K	$17.37M
Axiom investors llc /de	163.24K	0.13%	163.24K	$15.00M
Janney montgomery scott	122.56K	0.03%	122.56K	$11.26M

Sold Out

Holder	Change
Tfc financial management	-1.00
Tortoise investment management	-2.00
Claris advisors, llc / mo /	-3.00
Hexagon capital partners	-3.00
Albion financial group /ut	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	438	-19.04%	72,833,268	-26.27%	67	0.80%	210	-30.00%	161	-
Sep 30, 2025	521	12.53%	98,420,241	4.68%	91	1.20%	289	6.64%	155	19.23%
Jun 30, 2025	464	9.43%	96,964,608	0.64%	90	1.12%	273	17.17%	129	-0.77%
Mar 31, 2025	419	2.20%	94,490,759	-0.48%	88	1.12%	229	13.93%	131	-12.08%
Dec 31, 2024	372	-5.34%	88,859,921	-3.13%	82	1.13%	183	-21.46%	134	25.23%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Mid-Cap ETF	3.48M	3.22%	58.30K
Vanguard US Total Market Shares ETF	3.41M	3.19%	2.52K
Vanguard Total Stock Mkt Idx Inv	3.40M	3.15%	7.86K
iShares Russell 2000 ETF	2.60M	2.41%	238.21K
Vanguard Small Cap Index	2.44M	2.26%	-354.00
iShares Semiconductor ETF	2.04M	1.90%	457.51K
Vanguard Information Technology ETF	1.60M	1.49%	6.65K
EdgePoint Global	1.43M	1.32%	809.34K
EdgePoint Global Portfolio Series F	1.43M	1.32%	809.34K
Vanguard Small Cap Growth Index Inv	1.36M	1.26%	-23.18K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 10, 2026	Shinn John	SVP, General Counsel	Sell	$386.10K
Mar 10, 2026	Shinn John	SVP, General Counsel	Sell	$17.91K
Mar 03, 2026	Shinn John	SVP, General Counsel	Sell	$150.79K
Mar 03, 2026	Shinn John	SVP, General Counsel	Sell	$209.10K
Mar 03, 2026	Shinn John	SVP, General Counsel	Sell	$66.42K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	12
2025 Q4	-	5
2025 Q3	-	8
2025 Q2	-	9
2025 Q1	-	7

RMBS Ownership FAQ

Who owns the most shares of Rambus?

Rambus’s largest shareholders are Blackrock funding, inc. /de (16.28M shares, 15.11%), Blackrock (15.79M shares, 14.60%), and Vanguard group (12.29M shares, 11.41%). Together, they hold 41.12% of Rambus’s total shares outstanding.

Does Blackrock own Rambus?

Yes, BlackRock owns 14.60% of Rambus, totaling 15.79M shares as of Jun 2024. This represents 0.02% of BlackRock's total assets, with a market value of 927.6M$. In the last quarter, BlackRock increased its holdings by 345.25K shares, a 2.24% change.

Who is Rambus’s biggest shareholder by percentage of total assets invested?

Aspetuck financial management is Rambus’s biggest shareholder by percentage of total assets invested, with 2.36% of its assets in 38.18K Rambus shares, valued at 3.51M$.

Who is the top mutual fund holder of Rambus shares?

iShares Core S&P Mid-Cap ETF is the top mutual fund holder of Rambus shares, with 3.22% of its total shares outstanding invested in 3.48M Rambus shares.

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