Applied Optoelectronics (AAOI) officer sells 36,400 shares in market trade

Rhea-AI Filing Summary

APPLIED OPTOELECTRONICS, INC. officer Chang Hung-Lun (Fred) sold 36,400 shares of common stock in an open-market transaction on March 16, 2026 at a weighted average price of $100.245 per share. The trades were executed at prices ranging from $100.00 to $100.80 per share.

After these sales, he directly holds 233,618 shares of common stock. The transactions were reported as routine open-market sales, with the weighted average price disclosed and full trade details available upon request as noted in the footnote.

Insights

Equity markets analyst

Officer executes sizeable open-market sale but retains a substantial stake.

The filing shows an APPLIED OPTOELECTRONICS officer completing an open-market sale of 36,400 common shares at a weighted average price of $100.245. The sales occurred in multiple trades between $100.00 and $100.80 per share on March 16, 2026.

Following the sale, the insider continues to own 233,618 shares directly, indicating a remaining meaningful position. This pattern is consistent with a liquidity event rather than a full exit. The footnote’s emphasis on weighted-average pricing and trade-by-trade detail is standard for larger, multi-lot transactions.

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^*

Chang Hung-Lun (Fred)

(Last) (First) (Middle)

C/O APPLIED OPTOELECTRONICS, INC.

13139 JESS PIRTLE BLVD.

(Street)

SUGAR LAND TEXAS 77478

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
APPLIED OPTOELECTRONICS, INC. [ AAOI ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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, $.001 par value	03/16/2026		S		36,400(1)	D	$100.245	233,618	D

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. The shares were sold in multiple transactions on March 16, 2026 at actual sale prices ranging from $100.00 to $100.80 per share. The price reported reflects the weighted average sale price for the transactions. The reporting person undertakes to provide upon request by SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold during each transaction

Remarks:

*** Senior Vice President and North America General Manager.

	/s/ David C. Kuo, attorney in fact for Hung-Lun (Fred) Chang	03/18/2026
	** 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)

FAQ

What insider transaction did APPLIED OPTOELECTRONICS (AAOI) report?

APPLIED OPTOELECTRONICS reported that officer Chang Hung-Lun (Fred) sold 36,400 shares of common stock. The sale occurred in the open market on March 16, 2026 and was disclosed on a Form 4 insider trading report.

At what price did the AAOI insider sell the 36,400 shares?

The AAOI insider sold 36,400 shares at a weighted average price of $100.245 per share. Individual trades that day were executed at prices ranging from $100.00 to $100.80 per share, according to the disclosed footnote.

How many APPLIED OPTOELECTRONICS shares does the insider own after the sale?

After the reported sale, the insider directly holds 233,618 shares of APPLIED OPTOELECTRONICS common stock. This remaining ownership reflects the position as of March 16, 2026, immediately following the open-market transactions disclosed in the Form 4 filing.

Was the AAOI insider trade a buy or a sell transaction?

The AAOI insider trade was a sell transaction. The Form 4 lists transaction code "S" and describes it as an open-market sale, with 36,400 shares of common stock sold at a weighted average price of $100.245 per share.

Did the APPLIED OPTOELECTRONICS insider sale occur in a single trade?

No, the sale occurred in multiple transactions on March 16, 2026. The footnote explains that shares were sold in several trades at prices between $100.00 and $100.80, with $100.245 per share disclosed as the weighted average sale price.

Is the AAOI insider’s ownership direct or indirect after this Form 4?

The filing characterizes the insider’s remaining 233,618 shares as directly owned. The ownership code is listed as "D" for direct, and there is no indication in the footnotes of indirect holdings through entities or trusts in this specific transaction.