Ainos (NASDAQ: AIMD) investor discloses 8.06% stake in 13D/A

Rhea-AI Filing Summary

Ainos, Inc. investor Chun-Jung Tsai filed an amended Schedule 13D reporting beneficial ownership of 686,999 shares of common stock, representing 8.06% of the class. These shares include 330,000 fully vested restricted stock units granted under the Ainos, Inc. 2023 Stock Incentive Plan.

The shares are subject to a voting agreement between the reporting person and Ainos Inc., a Cayman Islands corporation. Tsai states no current plans for major corporate actions but may review and change this position over time. The filer reports no other transactions in the past 60 days aside from the equity grant.

Key Figures

Beneficial ownership: 686,999 shares Ownership percentage: 8.06% Restricted stock units: 330,000 RSUs +3 more

6 metrics

Beneficial ownership 686,999 shares Shares of Ainos common stock beneficially owned by Chun-Jung Tsai

Ownership percentage 8.06% Percent of Ainos common stock class represented by 686,999 shares

Restricted stock units 330,000 RSUs Fully vested RSUs of Ainos common stock under 2023 Stock Incentive Plan

Shares outstanding 7,266,011 shares Ainos common stock outstanding as of March 30, 2026

Service fee shares 19,531 shares Ainos shares issued for service fee on April 1, 2026

Granted and vested shares 1,239,000 shares Ainos common stock granted and vested on April 15, 2026 under 2023 Plan

Key Terms

beneficial ownership, restricted stock units, Stock Incentive Plan, voting agreement, +1 more

5 terms

beneficial ownership financial

"The numbers in Rows 8, 9, and 11 represents beneficial ownership of 686,999 shares of common stock"

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.

restricted stock units financial

"The Reporting Person acquired 330,000 restricted stock units ("RSUs") of Common Stock"

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.

Stock Incentive Plan financial

"under the Ainos, Inc. 2023 Stock Incentive Plan, all of which are fully vested"

A stock incentive plan is a company program that gives employees or directors pieces of ownership or the right to buy shares over time, similar to receiving a bonus paid in company stock instead of cash. Investors pay attention because these plans align staff incentives with long‑term company performance but can also dilute existing shareholders and affect reported profits when grants are expensed, so they influence both ownership percentages and financial results.

voting agreement financial

"which are subject to a voting agreement between the Reporting Person and Ainos Inc., a Cayman Islands corporation"

Schedule 13D regulatory

"This Amendment No. 1 ("Amendment No. 1") amends the first filed with the Securities and Exchange Commission"

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

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 Boulevard, Xinzhuang District
New Taipei City, F5, 242
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

Chun-Jung Tsai

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

TAIWAN

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 686,999.00
9	Sole Dispositive Power 686,999.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

686,999.00

12

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

13

Percent of class represented by amount in Row (11)

8.06 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

The numbers in Rows 8, 9, and 11 represents beneficial ownership of 686,999 shares of common stock, $0.01 par value (the "Common Stock"), of Ainos, Inc., a Texas corporation (the "Issuer"), which are subject to a voting agreement between the Reporting Person and Ainos Inc., a Cayman Islands corporation ("Ainos KY"). For further details, please see Item 3 and Item 6. 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: AINOS, INC., 8880 RIO SAN DIEGO DRIVE SUITE 800, SAN DIEGO, CALIFORNIA , 92108.
Item 1 Comment: This Amendment No. 1 ("Amendment No. 1") amends the Schedule 13D first filed with the Securities and Exchange Commission on November 28, 2025 (the "Schedule 13D"), and is filed by Chun-Jung Tsai, 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
	The Reporting Person acquired 330,000 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.
Item 4.	Purpose of Transaction
	The Reporting Person acquired the 330,000 RSUs under the Ainos, Inc. 2023 Stock Incentive Plan. Except as described in this Schedule 13D, the Reporting Person do 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 5.	Interest in Securities of the Issuer
(a)	The information requested is incorporated herein by reference to the cover pages to this Statement.
(b)	The information requested is incorporated herein by reference to the cover pages to this Statement.
(c)	The reporting person has not effected any transactions in Common Stock during the past 60 days, except as described in this Statement.
(d)	The information in Item 2 is incorporated by reference into this Item 5(d).
(e)	Not applicable.

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.

Chun-Jung Tsai

Signature:	/s/ Chun-Jung Tsai
Name/Title:	Chun-Jung Tsai
Date:	04/17/2026

FAQ

Who is the reporting person in the Ainos (AIMD) Schedule 13D/A filing?

The reporting person is Chun-Jung Tsai, who filed an amended Schedule 13D on Ainos, Inc. common stock. Tsai reports beneficial ownership of 686,999 shares, partly through fully vested restricted stock units granted under the Ainos, Inc. 2023 Stock Incentive Plan.

How many Ainos (AIMD) shares does Chun-Jung Tsai report owning in this 13D/A?

Chun-Jung Tsai reports beneficial ownership of 686,999 Ainos common shares. This figure includes shares linked to a voting agreement and 330,000 fully vested restricted stock units granted under the company’s 2023 Stock Incentive Plan, reflecting Tsai’s total reported economic and voting stake.

What percentage of Ainos (AIMD) common stock does 686,999 shares represent?

The filing states that 686,999 shares represent 8.06% of Ainos’ common stock. This percentage is based on 7,266,011 shares outstanding as of March 30, 2026, plus additional shares issued for service fees and stock grants during early April 2026.

What equity award did Chun-Jung Tsai receive from Ainos (AIMD)?

Chun-Jung Tsai acquired 330,000 restricted stock units (RSUs) of Ainos common stock under the Ainos, Inc. 2023 Stock Incentive Plan. The filing notes that all these RSUs are fully vested, increasing Tsai’s beneficial ownership and forming part of the 686,999 reported shares.

Does the Ainos (AIMD) Schedule 13D/A describe any plans to change company control?

The filing states Tsai currently has no specific plans for actions such as mergers, recapitalizations, or control changes. However, it notes Tsai may review and change this position over time and may seek to influence management or the board regarding the issuer’s business and affairs.

What role does the voting agreement play in Chun-Jung Tsai’s Ainos (AIMD) holdings?

The 686,999 beneficially owned shares are described as subject to a voting agreement between Tsai and Ainos Inc., a Cayman Islands corporation. This agreement affects how the shares’ voting rights are exercised, though detailed terms are referenced to other items in the same disclosure.