Ainos director reports open-market share purchases

Ainos, Inc. director Chiang Yao-Chung reported two open-market purchases of the company’s common stock through indirect ownership by his spouse.

Accepted by SEC EDGAR 05/20/2026 - 04:10 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Ainos, Inc. director Chiang Yao-Chung reported two open-market purchases of the company’s common stock through indirect ownership by his spouse. On May 19, his spouse bought 2,200 shares at $1.68 per share, bringing that indirect position to 3,529 shares. On May 18, his spouse bought 500 shares at $1.65 per share, bringing that indirect position to 1,329 shares. A footnote states that, in addition to these indirect holdings, Chiang directly owns 90,880 shares of Ainos common stock.

Insider Trade Summary

Net Buyer: 2,700 shares

Net Buy 2 txns

Insider chiang yao-chung

Role Director

Bought 2,700 shs ($5K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	2,200	$1.68	$4K
Purchase	Common Stock	500	$1.65	$825.00

Holdings After Transaction: Common Stock — 3,529 shares (Indirect, By Spouse)

Footnotes (1)

1. F1. In addition to the shares indirectly held, the Reporting Person directly owns 90,880 shares of the Issuer's common stock as previously disclosed.

Key Figures

May 19 purchase: 2,200 shares at $1.68 May 18 purchase: 500 shares at $1.65 Total shares bought: 2,700 shares +3 more

6 metrics

May 19 purchase 2,200 shares at $1.68 Open-market common stock buy on May 19, 2026

May 18 purchase 500 shares at $1.65 Open-market common stock buy on May 18, 2026

Total shares bought 2,700 shares Net common stock purchased across two open-market trades

Indirect holding after May 19 3,529 shares Indirect spouse-held common stock following May 19 purchase

Indirect holding after May 18 1,329 shares Indirect spouse-held common stock following May 18 purchase

Direct ownership 90,880 shares Common stock directly owned by Chiang Yao-Chung per footnote

Key Terms

open-market purchase, indirect ownership, By Spouse, beneficial ownership

4 terms

open-market purchase financial

"transaction_action": "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

indirect ownership financial

""ownership_type": "indirect", "ownership_code": "I""

By Spouse financial

""nature_of_ownership": "By Spouse""

beneficial ownership financial

"Reporting Person directly owns 90,880 shares of the Issuer's 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did Ainos (AIMD) report for Chiang Yao-Chung?

Ainos reported that director Chiang Yao-Chung made two open-market purchases of common stock through indirect ownership by his spouse, buying 2,200 shares on May 19 and 500 shares on May 18 at prices below two dollars per share.

How many Ainos (AIMD) shares did Chiang Yao-Chung buy and at what prices?

Across two transactions, Chiang Yao-Chung’s spouse bought a total of 2,700 Ainos shares. The May 19 trade was 2,200 shares at $1.68 per share, and the May 18 trade was 500 shares at $1.65 per share in open-market purchases.

Are the new Ainos (AIMD) share purchases held directly or indirectly by Chiang Yao-Chung?

The newly purchased Ainos shares are held indirectly by Chiang Yao-Chung, classified as ownership "By Spouse." The filing labels these as indirect holdings, while a footnote explains that Chiang separately and directly owns 90,880 shares of Ainos common stock.

What are Chiang Yao-Chung’s indirect Ainos (AIMD) holdings after these purchases?

Following the May 19 transaction, the indirect holding by spouse reflected in that line was 3,529 shares. Following the May 18 transaction, the related indirect holding was 1,329 shares, as reported in the Form 4’s post-transaction ownership fields.

How many Ainos (AIMD) shares does Chiang Yao-Chung directly own according to the filing?

A footnote states that, in addition to the indirectly held shares, Chiang Yao-Chung directly owns 90,880 shares of Ainos common stock. This direct ownership amount was previously disclosed and is reiterated in the current Form 4 filing for context.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

chiang yao-chung

(Last) (First) (Middle)

10F-2 NO. 66, SHENGYI 5TH RD.

(Street)

ZHUBEI CITY 302

(City) (State) (Zip)

TAIWAN

(Country)

2. Issuer Name and Ticker or Trading Symbol
Ainos, Inc. [ AIMD ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/18/2026		P		500	A	$1.65	1,329(1)	I	By Spouse
Common Stock	05/19/2026		P		2,200	A	$1.68	3,529(1)	I	By Spouse

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. In addition to the shares indirectly held, the Reporting Person directly owns 90,880 shares of the Issuer's common stock as previously disclosed.

	/s/ Chun-Hsien Tsai by POA for Yao-Chung Chiang	05/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)