Harmonic SVP Ronald J. Glahn acquires 3,750 shares

Each restricted stock unit represents a contingent right to receive one share of HLIT common stock.

Rhea-AI Filing Summary

Harmonic Inc. SVP, Global Sales, Broadband Ronald J. Glahn exercised 3,750 restricted stock units on October 15, 2026, receiving 3,750 common shares. On the same date, 1,031 common shares were delivered or withheld for payment of exercise price or tax liability at $10.58 per share. The reported position after the transaction included 7,500 restricted stock units.

Insider Trade Summary

3,750 shares exercised/converted

Exercise 3 txns

Insider Glahn Ronald J

Role SVP, Global Sales, Broadband

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units F1	3,750	$0.00	$0.00
Exercise	Common Stock	3,750	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	1,031	$10.58	$11K

Holdings After Transaction: Restricted Stock Units — 7,500 contracts (Direct); Common Stock — 47,182 shares (Direct)

Footnotes (1)

1. F1. Each restricted stock unit represents a contingent right to receive one share of HLIT common stock.

Key Figures

Restricted stock units exercised: 3,750 units Common shares acquired: 3,750 shares Shares delivered or withheld: 1,031 common shares +2 more

5 metrics

Restricted stock units exercised 3,750 units October 15, 2026

Common shares acquired 3,750 shares October 15, 2026

Shares delivered or withheld 1,031 common shares For payment of exercise price or tax liability on October 15, 2026

Price per share $10.58 per share For the shares delivered or withheld on October 15, 2026

Restricted stock units after transaction 7,500 units Reported following the October 15, 2026 transaction

Key Terms

Restricted Stock Units, contingent right, exercise price or tax liability

3 terms

Restricted Stock Units financial

"Each restricted stock unit represents a contingent right"

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.

contingent right financial

"a contingent right to receive one share of HLIT common stock"

exercise price or tax liability financial

"Payment of exercise price or tax liability by delivering or withholding securities"

FAQ

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

How many shares did Ronald J. Glahn receive in the HLIT transaction?

Ronald J. Glahn exercised 3,750 restricted stock units on October 15, 2026, receiving 3,750 common shares.

How many HLIT shares were delivered or withheld for payment?

1,031 common shares were delivered or withheld for payment of exercise price or tax liability at $10.58 per share on October 15, 2026.

What does an HLIT restricted stock unit represent?

Each restricted stock unit represents a contingent right to receive one share of HLIT common stock.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/19/2026 - 05:16 PM EDT Accepted by SEC EDGAR 10/19/2026 - 05:15 PM EDT Learn about SEC filing dates

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^*

Glahn Ronald J

(Last) (First) (Middle)

2590 ORCHARD PARKWAY

(Street)

SAN JOSE CALIFORNIA 95131

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
HARMONIC INC. [ HLIT ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Global Sales, Broadband

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026

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	10/15/2026		M		3,750	A	$0	48,213	D
Common Stock	10/15/2026		F		1,031	D	$10.58	47,182	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
Restricted Stock Units(1)	$0	10/15/2026		M			3,750	04/15/2025	04/15/2027	Common Stock	3,750	$0	7,500	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of HLIT common stock.

	/s/ Wendi Ninh, Attorney-in-Fact	10/19/2026
	** 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)