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J-Star Co., Ltd.: investment adviser
J-Star Co., Ltd. is an investment adviser registered with the SEC (file 802-110241, CRD 287541). What it reports on Form ADV: assets and clients, fees, owners, disciplinary history and its client brochure. From the SEC's Investment Adviser Public Disclosure site; read Oct 21, 2026.
- Assets managed
- –
- Discretionary
- –
- Accounts
- –
- Employees
- –
- In advisory roles
- –
- Disclosures
- 0
Company page · SEC adviser record · Full Form ADV (PDF)
The firm reports no custody of client cash or securities.
Form ADV Part 1A, Item 5, as filed on the SEC Investment Adviser Public Disclosure site; read Oct 21, 2026.
Who owns it
Schedule A lists direct owners of 5% or more (and officers who own a stake); Schedule B lists the owners of those owners.
Direct owners (Schedule A)
| Owner | Type | Role | Stake | Since | Control | Public company |
|---|---|---|---|---|---|---|
| Rokurou Gregory Hara | Person | Shareholder of j-star co., LTD. / director of j-star co., LTD. | C 25% to 50% | Feb 2006 | Yes | |
| Kenichi Harada | Person | Shareholder of j-star co., LTD. / director of j-star co., LTD. | C 25% to 50% | Feb 2006 | Yes | |
| Hideaki Sakurai | Person | Shareholder of j-star co., LTD. / director of j-star co., LTD. | B 10% to 25% | Oct 2006 | ||
| Tastuya Yumoto | Person | Shareholder of j-star co., LTD. / partner of j-star co., LTD. | B 10% to 25% | Feb 2006 |
Form ADV reports ownership in bands, not exact stakes: A means 5% to 10%, B 10% to 25%, C 25% to 50%, D 50% to 75%, E 75% or more. F marks a general partner, trustee or managing member, a role that controls the firm without a percentage. Owners of less than 5% are not listed.
Form ADV Schedules A and B, via the SEC Investment Adviser Public Disclosure site.
Disciplinary history
The firm answered No to every disciplinary question on Form ADV (Item 11).
The brochure
No brochure text was read for this firm.
Form ADV Part 2A, via the SEC Investment Adviser Public Disclosure site.