ATEYY · Advantest Corp · Holdings

$216.01 -7.65 (-3.42%) At close · Nov 4

Market Cap

$155.87B

722.10M

Volume · Nov 4 155.01K Avg daily vol (3M) 163.56K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of ATEYY: 13F, 13D and 13G, insiders and funds →

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.

The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.

Quarter:

Holders: 20

Total Value: $18,649,902

Total Shares: 85,797

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 18 13F filers

Top Holder

38.8%

of institutional value

Top 5

87.3%

of institutional value

Top 10

97.8%

of institutional value

HHI

2,302

Moderately concentrated

Who Holds ATEYY

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 18 filers, like-for-like change +3.5%; actively managed books +10.0%; index-like books -8.9%.

Holder type	Share	Filers	Change	New	Exited
Registered adviser	87.5%	11	-0.4%	2	2
Adviser	0.2%	1	+695.2%	0	0
Bank	2.3%	2	+212.4%	1	0
Unknown	10.0%	4	+25.5%	1	0

Style	Share	Filers	Change	New	Exited
Index-like	30.4%	3	-8.9%	0	0
Concentrated	18.1%	6	+11.2%	1	1
Diversified active	51.5%	9	+9.6%	3	1
Not measured	0.0%	0	—	0	0

Turnover	Share	Filers	Change	New	Exited
Low turnover	83.4%	16	+1.3%	3	1
Medium turnover	16.3%	1	+14.0%	0	1
High turnover	0.0%	0	—	0	0
Unknown	0.3%	1	new	1	0
Not measured	0.0%	0	—	0	0

Holding horizon	Share	Filers	Change	New	Exited
Medium horizon	11.3%	2	-2.1%	0	1
Long horizon	72.3%	14	+2.0%	4	1
Short horizon	0.0%	0	—	0	0
Unknown	16.5%	2	+15.2%	0	0
Not measured	0.0%	0	—	0	0

13F book size	Share	Filers	Change	New	Exited
Under $1B	25.3%	7	+24.5%	3	1
$1B to $10B	52.7%	7	-8.7%	1	1
$10B to $100B	0.3%	2	+913.6%	0	0
$100B or more	21.8%	2	+17.2%	0	0
Not measured	0.0%	0	—	0	0

Client base	Share	Filers	Change	New	Exited
Individuals and high net worth	1.9%	5	-14.0%	2	1
Governments and sovereign funds	37.2%	2	+16.0%	0	0
Other investment advisers	9.5%	2	-38.9%	0	0
Diversified	38.9%	2	+2.3%	0	0
Corporations	0.0%	0	-100.0%	0	1
Registered funds and BDCs	0.0%	0	—	0	0
Unknown	12.5%	7	+43.1%	2	0

Private funds	Share	Filers	Change	New	Exited
Hedge funds	16.3%	1	+14.3%	0	0
Other private funds	59.7%	2	+6.9%	0	0
No private funds	11.5%	8	-35.3%	2	2
Unknown	12.5%	7	+43.1%	2	0

Location	Share	Filers	Change	New	Exited
United States	100.0%	18	+3.5%	4	2

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Conviction and Crowding

18 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders

5.56% of filers hold it in their top 10

Mar 31, 2026: 0

Holders above 5%

median weight 0.007%

Mar 31, 2026: 0

Crowding

—

no cover-page share count is dated within about a year of the quarter end

Private-fund advisers

—

of shares outstanding

Institutional ownership

—

no cover-page share count is dated within about a year of the quarter end

Top 10 holders

97.8%

of 13F shares, Herfindahl 0.230

Active holders

+10.0%

like-for-like share change of active filers

5% stakes on record

0 13D, 0 13G

How long holders have held it value-weighted 6.9 quarters

Under 1 year 20.2% 1 to 3 years 55.3% 3 years or more 24.5% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost

$79.32

estimated per share

Mar 31, 2026: $65.59

Quarter-end price

$208.06

implied by 13F values

Estimated gain or loss

+162.3%

price against the estimated cost

Estimated at a loss

0.000%

of costed 13F value

Estimated cost covers 71.4% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies ATEYY's active holders also own, quarter ended Jun 30, 2026

#	Company	Shared holders	Similarity
1	ING Ing Groep NV	3	0.178
2	NVS Novartis AG	3	0.063
3	ASML Asml Holding NV	3	0.040
4	TSM Taiwan Semiconductor Manufacturing Co Ltd	3	0.031

Shareholder Targets

13F filers that own its peers but not ATEYY, quarter ended Jun 30, 2026

Found through its holder-overlap peers: ING, NVS, ASML, TSM. 4,240 filers in all.

#	Filer	In peers	Of book	Largest peers
1	FMR LLC Holding company, Diversified active	$39,614,087,211 4 held	1.72%	TSM, ASML, NVS
2	Capital World Investors Adviser, Diversified active	$23,835,743,394 3 held	2.83%	TSM, ASML, ING
3	Fisher Asset Management, LLC Adviser, Diversified active	$21,051,662,744 4 held	6.30%	ASML, TSM, NVS
4	JPMORGAN CHASE & CO Bank, Diversified active	$16,573,838,082 4 held	0.960%	TSM, ASML, NVS
5	VAN ECK ASSOCIATES CORP Registered adviser, Index-like	$13,211,422,153 3 held	8.08%	TSM, ASML, NVS
6	MORGAN STANLEY Holding company, Index-like	$12,896,751,902 4 held	0.680%	TSM, ASML, NVS
7	BlackRock, Inc. Holding company, Index-like	$12,818,206,313 4 held	0.190%	TSM, ASML, NVS
8	Sanders Capital, LLC Registered adviser, Concentrated	$12,491,547,687 2 held	12.5%	TSM, ING
9	BANK OF AMERICA CORP /DE/ Bank, Diversified active	$11,568,702,247 4 held	0.750%	TSM, ASML, NVS
10	Capital International Investors Adviser, Diversified active	$10,429,201,931 2 held	2.16%	TSM, ASML

Fund Ownership of ATEYY by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 0.00% of shares outstanding.

Fund type	Of shares outstanding	Shares	Funds
Index funds	0.00%	0	0
Index ETFs	0.00%	3,533	1
Active ETFs	0.01%	38,421	3
Active funds	0.00%	13,685	3
Unclassified	0.00%	25,941	3
All registered funds	0.01%	81,580	10

How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 10 Adviser 2 Bank 2 Unknown 6

Showing 20 of 20

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Boston Common Asset Management, LLC

$7,429,288

39.84%

33,638

RHUMBLINE ADVISERS

$3,646,043

19.55%

17,524

Ativo Capital Management LLC

$3,249,071

17.42%

14,711

GAMMA Investing LLC

$1,378,828

7.39%

6,243

Canopy Partners, LLC

$813,648

4.36%

3,684

Diversified Trust Co

$643,945

3.45%

3,095

YOUSIF CAPITAL MANAGEMENT, LLC

$418,750

2.25%

1,896

Calydon Capital

$298,149

1.60%

1,433

Enterprise Financial Services Corp

$282,479

1.51%

1,279

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ENTERPRISE BANK & TRUST	1,279	$282,479	100.0%	Defined

Westside Investment Management, Inc.

$176,688

0.95%

800

PNC FINANCIAL SERVICES GROUP, INC.

$146,474

0.79%

704

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Wealth Management LLC	704	$146,474	100.0%	Defined

ATLAS CAPITAL ADVISORS INC.

$56,176

0.30%

270

First Command Advisory Services, Inc.

$34,746

0.19%

167

IMA Advisory Services, Inc.

$26,423

0.14%

127

Ascentis Wealth Management, LLC

$25,839

0.14%

117

HUNTINGTON NATIONAL BANK

$11,651

0.06%

Gleason Group, Inc.

$5,742

0.03%

Horrell Capital Management, Inc.

$2,871

0.02%

Copeland Capital Management, LLC

$2,208

0.01%

TRUST CO OF VERMONT

$883

0.00%

Key facts CIK 1158838 CUSIP 00762U200 13F (30d) 12 filings 12 filers Visit website Investor relations