[Form 4] POWER SOLUTIONS INTERNATIONAL, INC. Insider Trading Activity

Du Zhaoying reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Du Zhaoying reported acquisition or exercise transactions in this Form 4 filing.

Power Solutions International, Inc. reported that its General Counsel and Corporate Secretary, Du Zhaoying, received a grant of 1,492 Phantom Stock units on March 6, 2026. These Phantom Units are cash-settled awards tied to the average Fair Market Value of the company’s common stock over the 30 trading days before each vesting date.

One-third of the Phantom Units vest on each of March 6, 2027, March 6, 2028, and March 6, 2029, subject to continued service. The award does not provide any actual shares of common stock or voting rights, and 1,492 Phantom Units were reported as held after this grant.

Insider Trade Summary

Grant/Award: 1,492 shares

Grant/Award 1 txn

Insider Du Zhaoying

Role GC and Corp Secy

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock	1,492	$0.00	$0.00

Holdings After Transaction: Phantom Stock — 1,492 contracts (Direct)

Footnotes (1)

1. F1. Each Phantom Unit represents an unfunded, unsecured right to receive a cash payment equal to the average Fair Market Value per share of the Issuer's Common Stock over the thirty (30) trading days immediately preceding the applicable vesting date. Phantom Units are settled in cash only and do not entitle the Reporting Person to any shares of Common Stock or voting rights. One-third of the Phantom Units vest on each of March 6, 2027, March 6, 2028 and March 6, 2029, subject to the Reporting Person's continuous service with the Issuer or its affiliates.

Key Figures

Phantom Stock units granted: 1,492 units Units after transaction: 1,492 units Vesting schedule: 1/3 each year +2 more

5 metrics

Phantom Stock units granted 1,492 units Grant to GC and Corp Secy on March 6, 2026

Units after transaction 1,492 units Total Phantom Units reported following the grant

Vesting schedule 1/3 each year Vests on March 6, 2027, 2028, and 2029

Exercise/issue price $0.00 per unit Grant/award acquisition with no exercise price

Valuation basis period 30 trading days Average Fair Market Value before each vesting date

Key Terms

Phantom Stock, Phantom Units, Fair Market Value, vesting date, +1 more

5 terms

Phantom Stock financial

"Each Phantom Unit represents an unfunded, unsecured right to receive a cash payment"

A phantom stock is a form of compensation that gives employees or executives the benefits of stock ownership, such as the increase in stock value, without actually giving them real shares. It acts like a promise to pay the employee the equivalent value of company stock later, often as a bonus or incentive. This allows companies to motivate and reward staff without diluting ownership or transferring actual shares.

Phantom Units financial

"Phantom Units are settled in cash only and do not entitle the Reporting Person"

Phantom units are a form of employee compensation that mimics ownership in a company without issuing real shares: recipients receive cash or stock value tied to the company’s share price or performance when the units vest. They matter to investors because phantom units align employee incentives with shareholder value while avoiding share dilution; however, they create future cash obligations and can affect a company’s financial statements and cash flow.

Fair Market Value financial

"equal to the average Fair Market Value per share of the Issuer's Common Stock"

The price a willing buyer and a willing seller would agree on for an asset or security when neither is under pressure and both have access to the same information. Think of it as the market’s neutral estimate of what something is worth, like the price two neighbors would settle on for a car after comparing similar listings. Investors care because fair market value guides buying and selling decisions, tax reporting, portfolio valuation, and how accurately company assets are reflected in financial statements.

vesting date financial

"over the thirty (30) trading days immediately preceding the applicable vesting date"

unfunded, unsecured right financial

"Each Phantom Unit represents an unfunded, unsecured right to receive a cash payment"

FAQ

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

What did Power Solutions International (PSIX) disclose about Du Zhaoying’s Form 4 transaction?

Power Solutions International reported a grant of 1,492 Phantom Stock units to its General Counsel and Corporate Secretary, Du Zhaoying, on March 6, 2026. This is a compensation-related award, not an open-market stock purchase or sale, and is settled in cash rather than shares.

How do the Phantom Stock units granted to PSIX’s Du Zhaoying vest over time?

The 1,492 Phantom Units vest in three equal installments. One-third vests on March 6, 2027, another third on March 6, 2028, and the final third on March 6, 2029. Vesting is conditioned on Du Zhaoying’s continuous service with Power Solutions International or its affiliates.

Do the Phantom Stock units give PSIX’s Du Zhaoying any shares or voting rights?

The Phantom Units provide no shares of common stock or voting rights. Each unit represents an unfunded, unsecured right to receive a cash payment based on the average Fair Market Value of Power Solutions International’s common stock over the 30 trading days before the applicable vesting date.

How is the cash value of the Phantom Stock units for PSIX’s Du Zhaoying determined?

Each Phantom Unit is paid in cash equal to the average Fair Market Value per share of Power Solutions International’s common stock. The average is calculated over the 30 trading days immediately before each vesting date, aligning the award’s value with the company’s stock performance at that time.

What is Du Zhaoying’s reported Phantom Stock position at Power Solutions International after this grant?

After the March 6, 2026 grant, Du Zhaoying is reported as holding 1,492 Phantom Stock units. These are derivative, cash-settled compensation instruments linked to the value of Power Solutions International’s common stock and will vest over three annual installments, subject to continued service.

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

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Accepted by SEC EDGAR 04/17/2026 - 11:21 AM 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^*

Du Zhaoying

(Last) (First) (Middle)

201 MITTEL DR

(Street)

WOOD DALE ILLINOIS 60191

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
POWER SOLUTIONS INTERNATIONAL, INC. [ PSIX ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	GC and Corp Secy

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

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

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
Phantom Stock	(1)	03/06/2026		A		1,492		(1)	(1)	Common Stock	1,492	$0	1,492	D

Explanation of Responses:

1. Each Phantom Unit represents an unfunded, unsecured right to receive a cash payment equal to the average Fair Market Value per share of the Issuer's Common Stock over the thirty (30) trading days immediately preceding the applicable vesting date. Phantom Units are settled in cash only and do not entitle the Reporting Person to any shares of Common Stock or voting rights. One-third of the Phantom Units vest on each of March 6, 2027, March 6, 2028 and March 6, 2029, subject to the Reporting Person's continuous service with the Issuer or its affiliates.

	/s/ Zhaoying Du	04/17/2026
	** 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)