Harmonic (NASDAQ: HLIT) SVP reports RSU vesting and tax share withholding

Rhea-AI Filing Summary

Harmonic Inc. senior vice president of global sales for broadband, Ronald J. Glahn, reported routine equity compensation activity involving restricted stock units that settled into common shares.

He exercised 4,038 restricted stock units into common stock, with 1,111 shares withheld at $12.54 per share to cover tax obligations. Following these transactions, he holds 38,817 shares of common stock directly and 28,266 restricted stock units, each representing a contingent right to receive one share of HLIT common stock.

Insider Trade Summary

4,038 shares exercised/converted

Mixed 3 txns

Insider Glahn Ronald J

Role SVP, Global Sales, Broadband

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	4,038	$0.00	--
Exercise	Common Stock	4,038	$0.00	--
Tax Withholding	Common Stock	1,111	$12.54	$14K

Holdings After Transaction: Restricted Stock Units — 28,266 shares (Direct, null); Common Stock — 39,928 shares (Direct, null)

Footnotes (1)

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Key Figures

RSUs exercised: 4,038 units Shares withheld for taxes: 1,111 shares Tax-withholding price: $12.54 per share +3 more

6 metrics

RSUs exercised 4,038 units Restricted stock units converted to common stock on 2026-05-15

Shares withheld for taxes 1,111 shares Tax-withholding disposition at $12.54 per share on 2026-05-15

Tax-withholding price $12.54 per share Price used to value 1,111 shares delivered for tax liability

Common shares after transaction 38,817 shares Direct HLIT common stock holdings following reported transactions

RSUs remaining 28,266 units Restricted stock units outstanding after the RSU conversion

RSU expiration date 2028-02-15 Expiration date for the RSU award involved in the conversion

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative exercise/conversion, contingent right

4 terms

Restricted Stock Units financial

"The security title for one transaction is "Restricted Stock Units"."

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.

tax-withholding disposition financial

"The transaction_action is described as "tax-withholding disposition"."

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

derivative exercise/conversion financial

"Two transactions list the action as "derivative exercise/conversion"."

contingent right financial

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

Form 4 Insider Transactions: What Each Field Means →

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)
05/15/2026

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	05/15/2026		M		4,038	A	$0	39,928	D
Common Stock	05/15/2026		F		1,111	D	$12.54	38,817	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	05/15/2026		M			4,038	02/15/2026	02/15/2028	Common Stock	4,038	$0	28,266	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	05/19/2026
	** 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)

FAQ

What insider transactions did HLIT executive Ronald Glahn report on this Form 4?

Ronald Glahn reported the vesting of 4,038 restricted stock units into Harmonic Inc. common shares and a related tax-withholding disposition of 1,111 shares. These actions are compensation-related rather than open-market trades and reflect standard equity award settlement.

How many Harmonic (HLIT) shares does Ronald Glahn hold after this Form 4?

After the reported transactions, Ronald Glahn holds 38,817 shares of Harmonic common stock directly. He also holds 28,266 restricted stock units, which are contingent rights to receive the same number of HLIT shares in the future, subject to applicable vesting conditions.

What does the tax-withholding disposition on Ronald Glahn’s HLIT Form 4 mean?

The tax-withholding disposition shows 1,111 Harmonic shares were surrendered at $12.54 per share to satisfy tax obligations on vested equity. This is a non-market event where shares are delivered back, not a discretionary open-market sale by the executive.

What is the significance of the restricted stock units reported for HLIT’s Ronald Glahn?

The filing shows Ronald Glahn exercised 4,038 restricted stock units into Harmonic common shares and still holds 28,266 units. Each unit represents a contingent right to receive one HLIT share, typically subject to continued service or performance-based vesting terms.

Did Ronald Glahn buy or sell Harmonic (HLIT) shares on the open market?

The Form 4 reports no open-market buys or sells by Ronald Glahn. Instead, it reflects RSU vesting and a tax-withholding share disposition, both standard mechanisms for settling equity compensation rather than discretionary trading in HLIT stock.