ATEYY
Advantest CorpCompany with tickers: ATEYY, ADTTF
CIK
1158838
CUSIP
00762U200
Shares Outstanding
725,386,077
Website
https://www.advantest.com
Investor Relations
https://www.advantest.com/en/investors/
13F Activity (30d)
1 filings
1 filers
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.
Holders: 13
Total Value: $9,292,794
Total Shares: 68,425
Institutional Ownership Trend
25 quarters
Holder Concentration
Across 13 13F filers · Δ vs Dec 31, 2025Top Holder
46.5%
+17.0 pts
Top 5
92.8%
+3.6 pts
Top 10
99.9%
+0.0 pts
HHI
2,874
Highly concentrated+897
Quarterly Activity
vs Dec 31, 2025
New
3
Increased
5
Decreased
4
Sold Out
2
Unchanged
1
Holder count:
+1
Institutional value:
+55.0%
Shares held:
+44.2%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega RHUMBLINE ADVISERS | +959 | 14,944 | |
| Mid GAMMA Investing LLC | +362 | 5,426 | |
| Small Salomon & Ludwin, LLC | +230 | 530 | |
| Mega PNC FINANCIAL SERVICES GROUP, INC. | +163 | 613 | |
| Mid Diversified Trust Co | +21 | 2,890 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Small Westside Investment Management, Inc. | −476 | 800 | |
| Small Canopy Partners, LLC | −11 | 3,765 | |
| Large HUNTINGTON NATIONAL BANK | −8 | 1 | |
| Small IMA Advisory Services, Inc. | −4 | 25 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mid Boston Common Asset Management, LLC | 31,800 | $4,318,758 | |
| Small First Command Advisory Services, Inc. | 21 | $2,852 | |
| Small Horrell Capital Management, Inc. | 13 | $1,765 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Micro Ativo Capital Management LLC | 11,900 | $1,503,327 | |
| Micro Signature Equity Partners, LLC | 188 | $23,750 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid Boston Common Asset Management, LLC | $4,318,758 | 46.47% | 31,800 | Shares | Sole | 2026-05-07 | ||||
| Mega RHUMBLINE ADVISERS | $2,029,544 | 21.84% | 14,944 | Shares | Sole | 2026-05-12 | ||||
| Mid YOUSIF CAPITAL MANAGEMENT, LLC | $1,031,748 | 11.10% | 7,597 | Shares | Sole | 2026-04-24 | ||||
| Mid GAMMA Investing LLC | $736,905 | 7.93% | 5,426 | Shares | Defined | 2026-04-06 | ||||
| Small Canopy Partners, LLC | $511,324 | 5.50% | 3,765 | Shares | Sole | 2026-05-11 | ||||
| Mid Diversified Trust Co Bank | $392,490 | 4.22% | 2,890 | Shares | Sole | 2026-04-16 | ||||
| Small Westside Investment Management, Inc. | $108,648 | 1.17% | 800 | Shares | Sole | 2026-05-04 | ||||
| Mega PNC FINANCIAL SERVICES GROUP, INC. | $83,251 | 0.90% | 613 | Shares | Defined | 2026-05-08 | ||||
| Small Salomon & Ludwin, LLC | $71,979 | 0.77% | 530 | Shares | Sole | 2026-05-11 | ||||
| Small IMA Advisory Services, Inc. | $3,395 | 0.04% | 25 | Shares | Sole | 2026-05-06 | ||||
| Small First Command Advisory Services, Inc. | $2,852 | 0.03% | 21 | Shares | Sole | 2026-05-07 | ||||
| Small Horrell Capital Management, Inc. | $1,765 | 0.02% | 13 | Shares | Sole | 2026-04-30 | ||||
| Large HUNTINGTON NATIONAL BANK Bank | $135 | 0.00% | 1 | Shares | Defined | 2026-05-15 | ||||
| No holders match your search. | ||||||||||