RGKUY · Rigaku Holdings Corporation · Shareholders & Ownership
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Every disclosed holder of RGKUY in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns RGKUY
13F quarter Sep 30, 2026No chart: shares outstanding cannot be set against these holders.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 1,151 | — |
| Insiders (Forms 3, 4, 5) | 0 | — |
| 13D/G-only blocks | 0 | — |
| Registered funds (N-PORT, not summed) | 0 | — |
% Out is unavailable: no shares outstanding count is on record.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of RGKUY
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
GAMMA Investing LLC
13F
CIK 2010235 · Registered investment adviser · Sep 30, 2026
|
947 | ||
| 2 |
First Command Advisory Services, Inc.
13F
CIK 1727336 · Investment adviser · Sep 30, 2026
|
204 | ||
| 3 |
Atom Investment, L.P.
Non-US
· Nov 22, 2024
EDINET major-holding notification, previously 46.76%, 42.23% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 4 |
Atom Investment, L.P.
Non-US
· Apr 21, 2026
EDINET major-holding notification, previously 42.23%, 42.02% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 5 |
Atom Investment, L.P.
Non-US
· Jun 1, 2026
EDINET major-holding notification, previously 42.02%, 28.95% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 6 |
Atom Investment, L.P.
Non-US
· Jun 25, 2026
EDINET major-holding notification, previously 28.95%, 27.28% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 7 |
Atom Investment, L.P.
Non-US
· Aug 12, 2026
EDINET major-holding notification, previously 27.28%, 0.29% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 8 |
Columbia Management Investment Advisers, LLC, filing for 2 joint holders
Non-US
· Jun 15, 2026
EDINET major-holding notification, 8.56% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 9 |
Columbia Management Investment Advisers, LLC, filing for 2 joint holders
Non-US
· Jun 30, 2026
EDINET major-holding notification, previously 8.56%, 9.61% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 10 |
Columbia Management Investment Advisers, LLC, filing for 2 joint holders
Non-US
· Jul 31, 2026
EDINET major-holding notification, previously 9.61%, 10.76% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 11 |
Columbia Management Investment Advisers, LLC, filing for 2 joint holders
Non-US
· Sep 3, 2026
EDINET major-holding notification, previously 10.76%, 11.85% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 12 |
Hikaru Shimura
Non-US
· Nov 22, 2024
EDINET major-holding notification, previously 13.29%, 12.09% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 13 |
Hikaru Shimura
Non-US
· Jun 1, 2026
EDINET major-holding notification, previously 12.09%, 12.14% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 14 |
Hikaru Shimura, filing for 2 joint holders
Non-US
· Aug 20, 2026
EDINET major-holding notification, previously 12.14%, 12.13% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 15 |
Hikaru Shimura, filing for 2 joint holders
Non-US
· Sep 2, 2026
EDINET major-holding notification, previously 12.13%, 12.13% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 16 |
Hikaru Shimura, filing for 2 joint holders
Non-US
· Oct 20, 2026
EDINET major-holding notification, previously 12.13%, 12.13% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 17 |
Indus Capital Partners, LLC
Non-US
· Jan 15, 2025
EDINET major-holding notification, 5.55% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 18 |
Onto Innovation Inc.
Non-US
· Apr 21, 2026
EDINET major-holding notification, 27% of voting rights as filed, no share count, issuer-wide, not summed
|
— | ||
| 19 |
Onto Innovation Inc., filing for 2 joint holders
Non-US
· Sep 29, 2026
EDINET major-holding notification, previously 27%, 26.98% of voting rights as filed, no share count, issuer-wide, not summed
|
— |
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.