Rambus Ownership | Who Owns Rambus?

Overview Forecast RevenueFinancials Chart Transcripts

Rambus Ownership Summary

Rambus is owned by 91.63% institutional investors, 0.72% insiders, and 7.66% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 14.72% of RMBS shares. iShares Core S&P Mid-Cap ETF is the top mutual fund, with 3.25% of its assets in Rambus shares.

RMBS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Rambus	91.63%	0.72%	7.66%
Sector	Technology Stocks	50.72%	12.57%	36.71%
Idea	Semiconductor Stocks List	114.42%	7.19%	-21.61%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	15.81M	14.72%	$1.65B
Blackrock	15.79M	14.60%	$927.60M
Vanguard group	12.70M	11.83%	$1.32B
Price t rowe associates inc /md/	5.25M	4.88%	$546.57M
State street	4.39M	4.09%	$457.44M
Geode capital management	2.75M	2.56%	$286.43M
Edgepoint investment group	2.68M	2.50%	$279.56M
Jpmorgan chase	2.56M	2.38%	$266.42M
Invesco	2.43M	2.26%	$253.42M
Dimensional fund advisors lp	1.93M	1.80%	$200.97M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Analog century management lp	631.34K	3.53%	$65.79M
Aspetuck financial management	42.27K	3.02%	$4.41M
Emerald advisers	637.75K	2.13%	$66.45M
Emerald mutual fund advisers trust	391.21K	2.10%	$40.76M
Edgepoint investment group	2.68M	2.09%	$279.56M
Oberweis asset management inc/	507.90K	2.03%	$52.92M
Penn capital management company	286.26K	1.59%	$18.38M
Aurora investment counsel	23.60K	1.29%	$2.46M
Investors towarzystwo funduszy inwestycyjnych spolka akcyjna	29.75K	1.24%	$3.10M
Mesirow institutional investment management	298.17K	1.21%	$15.76M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	1.79M	0.01%	1.79M
Alliancebernstein	1.82M	0.06%	1.55M
Fmr	1.37M	0.01%	1.04M
Rafferty asset management	901.75K	0.30%	901.75K
Blackrock funding, inc. /de	15.81M	0.03%	808.61K

Top Sellers

Holder	Shares	% Assets	Change
Westwood group	235.06K	0.17%	-1.50M
Assenagon asset management	94.65K	0.01%	-786.91K
Park west asset management	-	-	-660.00K
Jpmorgan chase	2.56M	0.02%	-623.54K
Vaughan nelson investment management	-	-	-562.81K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.79M	0.01%	1.79M	$94.37M
Rafferty asset management	901.75K	0.30%	901.75K	$93.96M
William blair investment management	291.18K	0.08%	291.18K	$30.34M
Healthcare of ontario pension plan trust fund	200.00K	0.04%	200.00K	$20.84M
Arrowstreet capital, limited partnership	173.35K	0.01%	173.35K	$18.06M

Sold Out

Holder	Change
Tfc financial management	-1.00
Albion financial group /ut	-3.00
Claris advisors, llc / mo /	-3.00
Hexagon capital partners	-3.00
Tfo-tdc	-4.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Sep 30, 2024	388	1.84%	91,556,118	-4.70%	85	1.07%	230	31.43%	106	-30.26%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Mid-Cap ETF	3.50M	3.25%	-
Vanguard US Total Market Shares ETF	3.41M	3.19%	2.52K
Vanguard Total Stock Mkt Idx Inv	3.37M	3.14%	-71.16K
iShares Russell 2000 ETF	2.61M	2.43%	-
Vanguard Small Cap Index	2.61M	2.42%	-17.38K
Vanguard Information Technology ETF	1.80M	1.67%	18.28K
Swedbank Robur Technology A	1.50M	1.39%	-
Vanguard Small Cap Growth Index Inv	1.47M	1.37%	-3.79K
T. Rowe Price Integrated US SmCapGrEq	1.43M	1.33%	48.80K
T. Rowe Price Integrated US Sm Gr Eq	1.43M	1.33%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 10, 2025	STANG ERIC B	-	Sell	$447.14K
Nov 07, 2025	STANG ERIC B	-	Sell	$511.76K
Oct 06, 2025	Lynch Desmond	SVP, CFO	Sell	$367.89K
Oct 06, 2025	Lynch Desmond	SVP, CFO	Sell	$553.09K
Oct 01, 2025	Rao Meera	-	Sell	$66.60K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	5
2025 Q3	-	8
2025 Q2	-	9
2025 Q1	-	7
2024 Q4	-	2

RMBS Ownership FAQ

Who owns the most shares of Rambus?

Rambus’s largest shareholders are Blackrock funding, inc. /de (15.81M shares, 14.72%), Blackrock (15.79M shares, 14.60%), and Vanguard group (12.7M shares, 11.83%). Together, they hold 41.15% 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?

Analog century management lp is Rambus’s biggest shareholder by percentage of total assets invested, with 3.53% of its assets in 631.34K Rambus shares, valued at 65.79M$.

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 3.25% of its total shares outstanding invested in 3.5M Rambus shares.

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