Axcelis Technologies ACLS Institutional Ownership

NASDAQ ACLS

$127.07 +2.10 (+1.68%)

At close: Aug 21, 2026 · 4:00 PM EDT

Institutions by Trading Activity

369 Institutions

Increased 172 46.6%

Unchanged 69 18.7%

Reduced 128 34.7%

Ownership Statistics

13F · as of 31 Mar, 2026

Institutional Ownership

106.39%

▲+5.96 pp QoQ

Shares Held by Institutions

32.68Mn

of 30.72Mn outstanding

▲+24.15% QoQ

Shares Outstanding

30.72Mn

-1.96Mn held outside 13F filers

Institutional Investors

369

filed 13F for Mar 2026

▲+9 vs prior quarter

Net Shares Added (QoQ)

+6.36Mn

accumulated since last quarter

Value of Holdings

$4.43Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 31 Mar, 2026

Axcelis Technologies Inc (NASDAQ:ACLS) appears in 369 institutional 13F filings for the quarter ending March 2026.

They owned 106.4% of outstanding stock in March 2026, up from 100.4% the prior quarter.
Their total shares held in ACLS increased 24.15% from the prior quarter, while the number of investors in Axcelis Technologies increased 19.81% year over year.
Activity in ACLS broke down as 172 buyers, 128 sellers, and 69 unchanged among 369 total holders.
Institutional investors collectively held 32.68Mn shares in Axcelis Technologies as of March 2026, up by 6.36Mn shares quarter on quarter, and down 864.87K shares year over year.
As of March 31, 2026, the biggest holder of Axcelis Technologies is BlackRock, Inc. at 4.94Mn shares, representing 16.07% of shares outstanding.
Top purchasers of ACLS stock for the quarter ending March 2026 included VANGUARD PORTFOLIO MANAGEMENT LLC (2.49Mn), FMR LLC (1.82Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.38Mn), BALYASNY ASSET MANAGEMENT L.P. (1.12Mn), MANUFACTURERS LIFE INSURANCE COMPANY, THE (477.7K).
The biggest sellers of Axcelis Technologies for the quarter ending March 2026 included Goldman Sachs Group Inc (762.0K), VICTORY CAPITAL MANAGEMENT INC (528.4K), Invesco Ltd. (313.82K), AMERICAN CENTURY COMPANIES INC (281.73K), VOLORIDGE INVESTMENT MANAGEMENT, LLC (176.47K).
Business Quant data shows the 10 biggest positions in Axcelis Technologies as of March 2026 are held by BlackRock, Inc. (4.94Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (2.49Mn), FMR LLC (2.43Mn), REINHART PARTNERS, LLC. (1.66Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.38Mn), BALYASNY ASSET MANAGEMENT L.P. (1.36Mn), VICTORY CAPITAL MANAGEMENT INC (1.28Mn), State Street Corp (1.19Mn), BNP Paribas Asset Management Holding S.A. (1.01Mn), AMERICAN CENTURY COMPANIES INC (951.91K).

Form 13F Holdings

369 Institutional Holders

Report period 31 Mar, 2026

Total shares held 32.68Mn

Of outstanding 106.39%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	4,936,774	16.07%	▲109,199	+2.26%	$459.51Mn
2	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	2,488,293	8.10%	▲2,488,293	0.00%	$231.61Mn
3	FMR LLC	0000315066	2,431,121	7.91%	▲1,820,518	+298.15%	$226.29Mn
4	REINHART PARTNERS, LLC.	0001080298	1,657,745	5.40%	▲67,847	+4.27%	$154.30Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	1,382,770	4.50%	▲1,382,770	0.00%	$128.71Mn
6	BALYASNY ASSET MANAGEMENT L.P.	0001218710	1,364,540	4.44%	▲1,121,037	+460.38%	$127.01Mn
7	VICTORY CAPITAL MANAGEMENT INC	0001040188	1,279,005	4.16%	▼528,399	-29.24%	$119.05Mn
8	State Street Corp	0000093751	1,189,045	3.87%	▲2,818	+0.24%	$110.68Mn
9	BNP Paribas Asset Management Holding S.A.	0001520354	1,006,028	3.27%	▼85,066	-7.80%	$93.64Mn
10	AMERICAN CENTURY COMPANIES INC	0000748054	951,914	3.10%	▼281,732	-22.84%	$88.60Mn
11	DIMENSIONAL FUND ADVISORS LP	0000354204	844,097	2.75%	▲3,057	+0.36%	$78.57Mn
12	GEODE CAPITAL MANAGEMENT, LLC	0001214717	811,264	2.64%	▼106,483	-11.60%	$75.53Mn
13	PRIMECAP MANAGEMENT CO/CA/	0000763212	658,652	2.14%	▼6,290	-0.95%	$61.31Mn
14	Morgan Stanley	0000895421	581,636	1.89%	▲231,416	+66.08%	$54.14Mn
15	D. E. Shaw & Co., Inc.	0001009207	544,421	1.77%	▲74,136	+15.76%	$50.67Mn
16	Goldman Sachs Group Inc	0000886982	497,624	1.62%	▼762,004	-60.49%	$46.32Mn
17	MANUFACTURERS LIFE INSURANCE COMPANY, THE	0000928047	491,745	1.60%	▲477,705	+3,402.46%	$45.77Mn
18	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	445,769	1.45%	▲14,574	+3.38%	$41.49Mn
19	LSV ASSET MANAGEMENT	0001050470	429,500	1.40%	0	0.00%	$39.98K
20	Northern Trust Corp	0000073124	416,703	1.36%	▲11,557	+2.85%	$38.79Mn

Showing 1 to 20 of 369 holders