Ainos Inc. reports 5.76% stake in Ainos

Ainos Inc. (Cayman Islands) filed Amendment No. 15 to its Schedule 13D reporting beneficial ownership of 491,263 shares of Ainos, Inc. common stock, representing 5.76% of the class.

Rhea-AI Filing Summary

Ainos Inc. (Cayman Islands) filed Amendment No. 15 to its Schedule 13D reporting beneficial ownership of 491,263 shares of Ainos, Inc. common stock, representing 5.76% of the class. These 491,263 shares are owned directly by Ainos KY.

Ainos KY also holds sole voting power over a total of 4,807,506 shares through direct ownership and Voting Agreements with several shareholders, including ASE Test, Inc. and various individuals. The filing notes recent restricted stock unit grants on April 15, 2026 to three individuals, over which Ainos KY has sole voting discretion under a 2026 Voting Agreement.

Key Figures

Beneficially owned shares: 491,263 shares Ownership percentage: 5.76% Sole voting power: 4,807,506 shares +3 more

6 metrics

Beneficially owned shares 491,263 shares Common stock directly owned by Ainos KY

Ownership percentage 5.76% Percent of Ainos, Inc. common stock class represented by 491,263 shares

Sole voting power 4,807,506 shares Shares over which Ainos KY has sole voting power, including Voting Agreements

Voting Agreement shares 3,649,158 shares Shares covered by 2026 Voting Agreement with specified holders

ASE Voting Agreement shares 667,085 shares Shares tied to ASE Test, Inc. under the ASE Voting Agreement

RSUs granted April 15, 2026 1,200,000 shares RSUs to three individuals that fully vested on April 15, 2026

Key Terms

Schedule 13D, Voting Agreement, restricted stock units, beneficial ownership, +1 more

5 terms

Schedule 13D regulatory

"This Amendment No. 15 amends the first filed with the Securities and Exchange Commission on April 28, 2021"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

Voting Agreement financial

"3,649,158 shares pursuant to a Voting Agreement dated January 1, 2026"

A voting agreement is a legally binding pact in which shareholders promise to cast their votes the same way on certain corporate matters, such as electing directors or approving a merger. It matters to investors because it changes who controls company decisions and makes outcomes more predictable—like a group of neighbors agreeing in advance to vote the same way on a community rule, it can strengthen or limit the influence of other shareholders and affect the company’s future direction.

restricted stock units financial

"were granted restricted stock units ("RSUs") of the Issuer on April 15, 2026"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

beneficial ownership financial

"The numbers in Rows 9, 11 and 13 represents beneficial ownership of 491,263 shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole voting power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: 7 Sole Voting Power 4,807,506.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

FAQ

What percentage of Ainos, Inc. (AIMD) does Ainos KY currently beneficially own?

Ainos KY reports beneficial ownership of 491,263 Ainos, Inc. common shares, equal to 5.76% of the outstanding class. This percentage is based on 7,266,011 shares outstanding as of March 30, 2026 plus additional shares issued and granted in early April 2026.

How many Ainos, Inc. (AIMD) shares does Ainos KY control through voting power?

Ainos KY has sole voting power over 4,807,506 Ainos, Inc. shares. This total includes 491,263 shares it owns directly and 4,316,243 shares subject to Voting Agreements with various shareholders, including ASE Test, Inc. and several individuals, giving Ainos KY consolidated voting discretion.

What share count underlies the 5.76% ownership reported in the Ainos (AIMD) filing?

The 5.76% ownership is calculated from a base of 8,524,542 Ainos, Inc. shares. That figure combines 7,266,011 shares outstanding as of March 30, 2026, 19,531 shares issued for a service fee on April 1, 2026, and 1,239,000 shares granted and vested on April 15, 2026.

What recent equity grants are referenced in the Ainos (AIMD) Schedule 13D amendment?

On April 15, 2026, Ainos, Inc. granted restricted stock units totaling 1,200,000 shares to three individuals: 300,000 to Chun-Hsien Tsai, 570,000 to Ting-Chuan Lee, and 330,000 to Chun-Jung Tsai. These RSUs fully vested the same day under the 2023 Stock Incentive Plan.

How does the 2026 Voting Agreement affect Ainos KY’s control over Ainos (AIMD) shares?

The 2026 Voting Agreement gives Ainos KY sole voting discretion over 3,649,158 Ainos, Inc. shares held by specified shareholders. This voting arrangement, together with the ASE Voting Agreement and direct holdings, contributes to Ainos KY’s total sole voting power of 4,807,506 shares.

What is the structure of ASE Test, Inc.’s Ainos (AIMD) holdings under the Voting Agreement?

Under the ASE Voting Agreement, Ainos KY has voting power over 667,085 Ainos shares tied to ASE Test, Inc. This includes 11,777 shares owned outright, 555,308 shares issuable upon conversion of notes, and 100,000 shares issuable upon exercise of warrants held by ASE Test.

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Accepted by SEC EDGAR 04/17/2026 - 04:19 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 15)

Ainos, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

00902F402

(CUSIP Number)

Chun-Hsien Tsai
14F.,No. 61, Sec. 4, New Taipei Bouleva,, Xinzhuang District
New Taipei City 242, F5, F5
886-37-581999

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

04/15/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 00902F402

1

Name of reporting person

AINOS INC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 4,807,506.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 491,263.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

491,263.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.76 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

The number of securities in Row 7 includes (i) 491,263 shares of common stock, $0.01 par value, of Ainos, Inc., a Texas corporation (the "Issuer"), owned directly by Ainos Inc., a Cayman Islands company ("Ainos KY"), (ii) 3,649,158 shares pursuant to a Voting Agreement dated January 1, 2026 (the "2026 Voting Agreement"), by and among the Reporting Person, and Chun-Hsien Tsai, Ting Chuan Lee, Chun-Jung Tsai, Chung-Yi Tsai, Chih-Heng Lu, Taiwan Carbon Nano Technology Corporation ("TCNT"), and Hsin-Liang Lee, and (iii) 667,085 shares pursuant to a Voting Agreement dated May 3, 2024 between Ainos KY and ASE Test, Inc. ("ASE Test" and the "ASE Voting Agreement," together with the 2026 Voting Agreement, the "Voting Agreements") (with the 667,085 ASE Test shares consisting of the following (a) 11,777 shares owned by ASE Test, (b) 105,868 shares issuable to ASE Test upon conversion of outstanding convertible notes of the Issuer (c) 449,440 shares issuable to ASE Test upon conversion of a convertible note of the Issuer issuable within 60 days), and (d) 100,000 shares issuable to ASE Test upon exercise of warrants to purchase 100,000 shares of the Issuer with ASE Test). The numbers in Rows 9, 11 and 13 represents beneficial ownership of 491,263 shares of common stock of the Issuer, consisting of 491,263 shares owned directly by Ainos KY and excludes 4,316,243 shares pursuant to the Voting Agreements. The percentage in Row 13 is based on the sum of, (i) 7,266,011 shares of Common Stock outstanding as of March 30, 2026 as set forth in the Annual Report on Form 10-K of the Issuer filed with the SEC on March 30, 2026, (ii) 19,531 shares issued for service fee on April 1, 2026; and (iii) 1,239,000 shares of Common Stock granted and vested on April 15, 2026 under the Ainos, Inc. 2023 Stock Incentive Plan.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.01 per share
(b)	Name of Issuer: Ainos, Inc.
(c)	Address of Issuer's Principal Executive Offices: 3050 Post Oak Blvd, Suite 510-T80, Houston, TEXAS , 77056.
Item 1 Comment: This Amendment No. 15 ("Amendment No. 15") amends the Schedule 13D first filed with the Securities and Exchange Commission on April 28, 2021 (the "Original Statement"), as amended and restated by Amendment No. 1 dated December 13, 2023, as amended by Amendment No. 2 dated March 8, 2022, Amendment No. 3 dated September 2, 2022, Amendment No. 4 dated August 15, 2023, Amendment No. 5 dated January 29, 2024, Amendment No. 6 dated March 11, 2024, Amendment No. 7 dated May 6, 2024, Amendment No.8 dated August 20, 2024, Amendment No.9 dated November 26, 2024, Amendment No.10 dated March 12, 2025, Amendment No. 11 dated April 9, 2025, Amendment No. 12 dated October 9, 2025, Amendment No. 13 dated November 28, 2025, and Amendment No. 14 dated January 30, 2026 (the Original Statement, as so amended shall be known as the "Statement"), with respect to the common stock, par value $0.001 per share (the "Common Stock"), of Ainos, Inc. (the "Issuer"). Unless otherwise indicated, all capitalized terms used and not defined herein have the respective meanings assigned to them in the Schedule 13D.
Item 3.	Source and Amount of Funds or Other Consideration
	Since the filing of Amendment No. 14 on January 30, 2026, Mr. Chun-Hsien Tsai, Mrs. Ting-Chuan Lee and Mr. Chun-Jung Tsai were granted restricted stock units ("RSUs") of the Issuer on April 15, 2026, in the amounts of 300,000, 570,000 and 330,000, respectively, under the Ainos, Inc. 2023 Stock Incentive Plan. The RSUs fully vested on the same day. Pursuant to the 2026 Voting Agreement, the reporting person has sole voting discretion over such shares. The information requested by this Item 3 is incorporated herein by reference to Item 5 hereof.
Item 4.	Purpose of Transaction
	Ainos KY acquired the Common stock in the Issuer for investment purposes. Except as disclosed herein, each of the parties has no plans which relate to or would result in an event described in subparagraphs (a) through (j) of Item 4 of Schedule 13D. However, each of the Parties may, from time to time, engage in discussions, whether initiated by the Parties or another party, concerning proposals for transactions or other arrangements that may relate to or, if consummated, result in an event described in Item 4 of Schedule 13D. Each of the Parties may review and evaluate their respective investments in the Issuer at any time, whether in light of the discussions described in the immediately preceding sentence or otherwise, which may give rise to plans or proposals that, if consummated, would result in one or more of the events described in Item 4 of Schedule 13D. Any such discussion or actions may consider various factors, including, without limitation, the Issuer's business prospects and other developments concerning the Issuer, alternative investment opportunities, general economic conditions, financial and stock market conditions and any other facts and circumstances that may become known to the Parties regarding or related to the matters described in this Statement.
Item 5.	Interest in Securities of the Issuer
(a)	Items 5 of the Statement are hereby amended and restated as follows: (a) - (b) The information requested by these paragraphs are incorporated herein by reference to the cover pages to this Amendment No. 15.
(c)	The reporting person has not effected any transactions in Common Stock during the past 60 days, except as described in this Statement.
(d)	No other person is known to the reporting person to have the right to receive or the power to direct the receipt of dividends or the proceeds from the sale of the shares (other than their respective records owner).
(e)	Not applicable.
Item 7.	Material to be Filed as Exhibits.
	None.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

AINOS INC

Signature:	/s/ Chun-Hsien Tsai
Name/Title:	Chun-Hsien Tsai/Director and CEO
Date:	04/17/2026