Amprius Ownership | Who Owns Amprius?

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Amprius Ownership Summary

Amprius is owned by 31.20% institutional investors, 8.89% insiders, and 59.91% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 4.33% of AMPX shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 2.09% of its assets in Amprius shares.

AMPX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Amprius	31.20%	8.89%	59.91%
Sector	Industrials Stocks	64.07%	12.69%	23.24%
Industry	Electrical Equipment Stocks	41.64%	18.77%	39.59%
Idea	Electric Vehicle Stocks List	25.21%	17.93%	56.86%
Idea	EV Battery Stocks List	20.46%	15.46%	64.08%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	5.27M	4.33%	$22.19M
Vanguard group	4.18M	3.78%	$11.70M
Invesco	2.48M	2.25%	$6.96M
Board of trustees of the leland stanford junior university	1.46M	1.32%	$4.08M
Marshall wace, llp	1.11M	0.91%	$4.65M
Stephens investment management group	1.08M	0.89%	$11.39M
Baird financial group	1.00M	0.82%	$4.21M
Stifel financial	895.76K	0.81%	$2.51M
Blackrock	629.73K	0.70%	$799.75K
Renaissance	765.10K	0.69%	$2.14M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cornerstone partners capital management	30.71K	0.94%	$323.03K
Slt	120.30K	0.82%	$1.27M
Thames capital management	526.83K	0.79%	$5.54M
Board of trustees of the leland stanford junior university	1.46M	0.35%	$4.08M
Lexington partners	76.76K	0.26%	$214.94K
Stephens investment management group	1.08M	0.15%	$11.39M
Legato capital management	276.87K	0.14%	$1.17M
Harbour capital advisors	40.31K	0.10%	$510.79K
Apis capital advisors	60.00K	0.09%	$252.60K
Kingswood wealth advisors	77.70K	0.05%	$817.46K

Top Buyers

Holder	Shares	% Assets	Change
Blackrock funding, inc. /de	5.27M	0.00%	4.20M
Vanguard group	4.18M	0.00%	3.20M
Board of trustees of the leland stanford junior university	1.46M	0.35%	1.46M
Stephens investment management group	1.08M	0.15%	1.08M
Invesco	2.48M	0.00%	897.22K

Top Sellers

Holder	Shares	% Assets	Change
Zazove associates	-	-	-969.93K
Blackstone	-	-	-257.92K
Lmr partners llp	-	-	-165.41K
Warberg asset management	-	-	-133.64K
Fny investment advisers	-	-	-111.25K

New Positions

Holder	Shares	% Assets	Change	Value
Board of trustees of the leland stanford junior university	1.46M	0.35%	1.46M	$4.08M
Stephens investment management group	1.08M	0.15%	1.08M	$11.39M
Thames capital management	526.83K	0.79%	526.83K	$5.54M
Polar asset management partners	274.79K	0.02%	274.79K	$1.16M
Cowen and company	250.00K	0.01%	250.00K	$317.50K

Sold Out

Holder	Change
Nelson, van denburg & campbell wealth management group	-2.00
Kestra investment management	-10.00
Srs capital advisors	-60.00
Ifp advisors	-66.00
Allworth financial lp	-81.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	125	16.82%	37,991,404	82.87%	31	10.06%	82	26.15%	22	37.50%
Mar 31, 2025	106	6.00%	20,840,400	25.25%	17	7.78%	64	-3.03%	16	60.00%
Dec 31, 2024	97	29.33%	16,490,472	99.57%	14	26.67%	63	65.79%	10	-33.33%
Sep 30, 2024	74	1.37%	8,233,883	7.69%	7	10.34%	37	-19.57%	15	114.29%
Jun 30, 2024	73	37.74%	7,645,780	55.04%	8	25.95%	46	109.09%	7	-56.25%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	2.61M	2.09%	-58.09K
iShares Russell 2000 ETF	2.24M	1.79%	-
Invesco WilderHill Clean Energy ETF	1.13M	0.90%	-
Fidelity Small Cap Index	935.27K	0.75%	767.82K
iShares Russell 2000 Growth ETF	826.11K	0.66%	-
Vanguard US Total Market Shares ETF	593.90K	0.50%	-
Vanguard US Momentum Factor ETF	539.86K	0.45%	80.60K
Vanguard Institutional Extnd Mkt Idx Tr	507.26K	0.41%	-239.51K
State St Russell Sm/Mid Cp® Indx SL Cl I	459.24K	0.37%	399.79K
Global X Atnms & Elctrc Vhcls ETF	451.26K	0.36%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 21, 2025	Stefan Constantin Ionel	Chief Technology Officer	Sell	$130.59K
Aug 21, 2025	Wallach Sandra	Chief Financial Officer	Sell	$193.51K
Aug 21, 2025	Sun Kang	Chief Executive Officer	Sell	$447.51K
May 21, 2025	Stefan Constantin Ionel	Chief Technology Officer	Sell	$49.53K
May 21, 2025	Wallach Sandra	Chief Financial Officer	Sell	$67.11K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	-
2025 Q3	-	3
2025 Q2	-	3
2025 Q1	-	4
2024 Q4	-	6

AMPX Ownership FAQ

Who Owns Amprius?

Amprius shareholders are primarily institutional investors at 31.20%, followed by 8.89% insiders and 59.91% retail investors. The average institutional ownership in Amprius's industry, Electrical Equipment Stocks, is 41.64%, which Amprius falls below.

Who owns the most shares of Amprius?

Amprius’s largest shareholders are Blackrock funding, inc. /de (5.27M shares, 4.33%), Vanguard group (4.18M shares, 3.78%), and Invesco (2.48M shares, 2.25%). Together, they hold 10.36% of Amprius’s total shares outstanding.

Does Blackrock own Amprius?

Yes, BlackRock owns 0.70% of Amprius, totaling 629.72K shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 799.75K$. In the last quarter, BlackRock increased its holdings by 106.94K shares, a 20.46% change.

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

Cornerstone partners capital management is Amprius’s biggest shareholder by percentage of total assets invested, with 0.94% of its assets in 30.71K Amprius shares, valued at 323.03K$.

Who is the top mutual fund holder of Amprius shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Amprius shares, with 2.09% of its total shares outstanding invested in 2.61M Amprius shares.

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