As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Ainos Inc. The largest reported stake is Chun-Hsien Tsai's, at 8.33%. One filing is on record since April 17, 2026 (Schedule 13D/A, April 17, 2026).
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Key facts
- · Reporting person: Chun-Hsien Tsai · Sole voting: 0 · Shared voting: 710,372 · Sole dispositive: 710,372 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-04-17
- · Holder: Chun-Hsien Tsai · Percent: 8.33% · SCHEDULE 13D/A
- · Holder: Chun-Hsien Tsai · Percent: 8.33% · Shares: 710,372 · SCHEDULE 13D/A
Ainos Inc has 1 Schedule 13D or 13G filing on record since 2026-04-17. 1 holder's latest filing reports 5% or more of common stock, par value $0.01 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 8.33% | 710,372 | SCHEDULE 13D/A, 2026-04-17 | 2026-04-15 |
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More on Ainos Inc and the records around it.
Companies that share a holder
- Chun-Hsien Tsai also filed stake reports on 1 other company: Ainos, Inc. (Nov 2025)
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What the Full Report on Ainos Inc covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Chun-Hsien Tsai | 0 | 710,372 | 710,372 | 0 | SCHEDULE 13D/A, 2026-04-17 |
The latest filing identifies Ainos Inc by CUSIP 00902F402 and gives its principal executive office as 8880 RIO SAN DIEGO DRIVE, SUITE 800, SAN DIEGO, CA 92108 (SCHEDULE 13D/A, 2026-04-17).
Source of funds (Item 3)
On April 15, 2026, The Issuer granted 300,000 restricted stock units ("RSUs") of Common Stock to the Reporting Person under the Ainos, Inc. 2023 Stock Incentive Plan, all of which are fully vested.Chun-Hsien Tsai, SCHEDULE 13D/A, 2026-04-17
Purpose of Transaction (Item 4)
Chun-Hsien Tsai
The Reporting Person acquired the 300,000 RSUs under the Ainos, Inc. 2023 Stock Incentive Plan. Although the Reporting Person is the Chief Executive Officer, President, and Chairman of Board, the Reporting Person does not have any present plans or proposals that relate to or would result in any of the actions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D, although, subject to the agreements described herein, the Reporting Person, at any time, and from time to time, may review, reconsider and change their position and/or change their purpose and/or develop such plans and may seek to influence management of the Issuer or the Board of Directors with respect to the business and affairs of the Issuer and may from time to time consider pursuing or proposing such matters with advisors, the Issuer, or other persons.Item 4 of the SCHEDULE 13D/A filed 2026-04-17
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-04-17 | Chun-Hsien Tsai | 8.33% | SCHEDULE 13D/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.