Harmonic SVP exercises 4,038 RSUs, nets shares

Q: What insider transaction did HLIT executive Ronald J. Glahn report on this Form 4?

Ronald J. Glahn reported exercising restricted stock units into 4,038 shares of Harmonic Inc. common stock on 2026-08-15. This was paired with a share disposition to cover exercise price or tax liability.

Q: How many Harmonic (HLIT) shares were involved in Ronald Glahn’s RSU exercise?

Ronald Glahn exercised restricted stock units covering 4,038 underlying shares of Harmonic common stock. Each RSU represents a contingent right to receive one share of HLIT common stock upon settlement.

Q: How many Harmonic (HLIT) shares were withheld or delivered for taxes or exercise price?

A total of 1,111 common shares of Harmonic were delivered or withheld at $13.92 per share. The filing states this was for payment of exercise price or tax liability related to the RSU transaction.

Q: Was Ronald Glahn’s Harmonic (HLIT) Form 4 filed under a Rule 10b5-1 trading plan?

The document-level checkbox for Rule 10b5-1 status is unchecked, and no footnote indicates a trading plan. The transactions are therefore not affirmed as made pursuant to a Rule 10b5-1 plan in this report.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

How Sentiment works How the balance works

Form Type

Rhea-AI Filing Summary

HARMONIC INC. (HLIT) senior vice president Ronald J. Glahn reported an exercise of restricted stock units into 4,038 shares of common stock on 2026-08-15. The corresponding RSU derivative entry shows 24,228 restricted stock units remaining after this transaction. On the same date, 1,111 common shares were delivered or withheld at $13.92 per share for payment of exercise price or tax liability, leaving the net economic effect of these transactions neutral overall.

Insider Trade Summary

4,038 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	4,038	$0.00	$0.00
Exercise	Common Stock	4,038	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	1,111	$13.92	$15K

Holdings After Transaction: Restricted Stock Units — 24,228 contracts (Direct); Common Stock — 44,463 shares (Direct)

Footnotes (1)

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

Key Figures

RSUs exercised: 4,038 units RSUs remaining after transaction: 24,228 units Shares delivered/withheld for exercise price or tax liability: 1,111 shares +1 more

4 metrics

RSUs exercised 4,038 units Restricted stock units converted into Harmonic common stock on 2026-08-15

RSUs remaining after transaction 24,228 units Total restricted stock units reported following the derivative transaction

Shares delivered/withheld for exercise price or tax liability 1,111 shares Common shares used for payment of exercise price or tax liability at $13.92 per share

Price per share for tax/exercise payment $13.92 per share Value used in the code F transaction for 1,111 Harmonic common shares

Key Terms

Restricted Stock Units, Exercise or conversion of derivative security, Payment of exercise price or tax liability by delivering or withholding securities

3 terms

Restricted Stock Units financial

"Each restricted stock unit represents a contingent right to receive one share"

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.

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

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

"transaction_code_description: Payment of exercise price or tax liability by delivering"

FAQ

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

What insider transaction did HLIT executive Ronald J. Glahn report on this Form 4?

Ronald J. Glahn reported exercising restricted stock units into 4,038 shares of Harmonic Inc. common stock on 2026-08-15. This was paired with a share disposition to cover exercise price or tax liability.

How many Harmonic (HLIT) shares were involved in Ronald Glahn’s RSU exercise?

Ronald Glahn exercised restricted stock units covering 4,038 underlying shares of Harmonic common stock. Each RSU represents a contingent right to receive one share of HLIT common stock upon settlement.

How many Harmonic (HLIT) shares were withheld or delivered for taxes or exercise price?

A total of 1,111 common shares of Harmonic were delivered or withheld at $13.92 per share. The filing states this was for payment of exercise price or tax liability related to the RSU transaction.

What RSU balance does Ronald Glahn report after these Harmonic (HLIT) transactions?

After the derivative transaction, Ronald Glahn reports holding 24,228 restricted stock units. Each unit corresponds to a contingent right to receive one HLIT common share in the future, subject to applicable vesting and settlement terms.

Was Ronald Glahn’s Harmonic (HLIT) Form 4 filed under a Rule 10b5-1 trading plan?

The document-level checkbox for Rule 10b5-1 status is unchecked, and no footnote indicates a trading plan. The transactions are therefore not affirmed as made pursuant to a Rule 10b5-1 plan in this report.

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

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Available on EDGAR 08/18/2026 - 05:56 PM Accepted by SEC EDGAR 08/18/2026 - 05:55 PM

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)
08/15/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	08/15/2026		M		4,038	A	$0	45,574	D
Common Stock	08/15/2026		F		1,111	D	$13.92	44,463	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units⁽¹⁾	$0	08/15/2026		M			4,038	02/15/2026	02/15/2028	Common Stock	4,038	$0	24,228	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	08/18/2026
	** 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)

Source: View Original Filing on SEC EDGAR