Rambus Ownership | Who Owns Rambus?

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Rambus Ownership Summary

Rambus is owned by 90.27% institutional investors, 0.75% insiders, and 8.98% retail investors. Blackrock is the largest institutional shareholder, holding 14.60% 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	90.27%	0.75%	8.98%
Sector	Technology Stocks	143.99%	12.56%	-56.55%
Idea	Semiconductor Stocks List	62.65%	7.35%	30.01%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	15.79M	14.60%	$927.60M
Blackrock funding, inc. /de	15.00M	13.96%	$960.31M
Vanguard group	12.59M	11.75%	$665.77M
Price t rowe associates inc /md/	5.45M	5.08%	$288.04M
Invesco	5.00M	4.66%	$264.29M
State street	4.65M	4.31%	$273.49M
Jpmorgan chase	4.18M	3.90%	$221.19M
Edgepoint investment group	2.79M	2.60%	$178.44M
Geode capital management	2.58M	2.40%	$136.26M
Bank of new york mellon	2.10M	1.95%	$110.79M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Park west asset management	660.00K	3.20%	$42.25M
Analog century management lp	825.29K	2.92%	$43.62M
Apis capital advisors	112.00K	2.55%	$7.17M
Emerald advisers	710.12K	1.67%	$45.46M
Emerald mutual fund advisers trust	416.12K	1.62%	$26.64M
Penn capital management company	286.26K	1.59%	$18.38M
Oberweis asset management inc/	505.78K	1.41%	$32.38M
Edgepoint investment group	2.79M	1.35%	$178.44M
Mesirow institutional investment management	298.17K	1.21%	$15.76M
Westwood group	1.74M	0.98%	$111.21M

Top Buyers

Holder	Shares	% Assets	Change
Price t rowe associates inc /md/	5.45M	0.03%	4.45M
Invesco	5.00M	0.05%	2.09M
Norges bank	1.79M	0.01%	1.79M
Edgepoint investment group	2.79M	1.35%	1.62M
Analog century management lp	825.29K	2.92%	825.29K

Top Sellers

Holder	Shares	% Assets	Change
American century companies	32.95K	0.00%	-1.39M
Rafferty asset management	-	-	-871.31K
Assenagon asset management	94.65K	0.01%	-786.91K
Vaughan nelson investment management	-	-	-562.81K
Voloridge investment management	-	-	-551.77K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.79M	0.01%	1.79M	$94.37M
Analog century management lp	825.29K	2.92%	825.29K	$43.62M
T. rowe price investment management	312.95K	0.01%	312.95K	$20.04M
Glenmede investment management, lp	297.44K	0.10%	297.44K	$19.04M
Loomis sayles & co l p	220.23K	0.02%	220.23K	$14.10M

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 %
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%
Jun 30, 2024	377	-5.04%	96,039,948	-0.00%	88	1.13%	173	-17.62%	150	14.50%

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
Oct 06, 2025	Lynch Desmond	SVP, CFO	Sell	$553.09K
Oct 06, 2025	Lynch Desmond	SVP, CFO	Sell	$367.89K
Oct 01, 2025	Rao Meera	-	Sell	$66.60K
Sep 15, 2025	Lynch Desmond	SVP, CFO	Sell	$832.10K
Sep 11, 2025	Sayiner Necip	-	Sell	$642.23K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	3
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 (15.79M shares, 14.60%), Blackrock funding, inc. /de (15M shares, 13.96%), and Vanguard group (12.59M shares, 11.75%). Together, they hold 40.31% 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?

Park west asset management is Rambus’s biggest shareholder by percentage of total assets invested, with 3.20% of its assets in 660K Rambus shares, valued at 42.25M$.

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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