Canadian Solar (CSIQ) CTO exercises 4,582 RSUs and settles tax with 3 shares

Rhea-AI Filing Summary

Canadian Solar Inc. Chief Technology Officer Shawn Xiaohua Qu reported routine equity compensation activity and related tax withholding. He exercised 4,582 Restricted Share Units (RSUs) into the same number of common shares, with 3 common shares delivered to cover tax obligations. Following these transactions, he directly holds 13,784,150 common shares and has an additional 275,935 common shares indirectly owned through his spouse. A footnote states these RSUs have no expiration date.

Insider Trade Summary

4,582 shares exercised/converted

Mixed 4 txns

Insider Qu Shawn Xiaohua

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units	4,582	$0.00	--
Exercise	Common Stock	4,582	$0.00	--
Tax Withholding	Common Stock	3	$16.3434	$49.03
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Share Units — 40,437 shares (Direct, null); Common Stock — 13,784,153 shares (Direct, null); Common Stock — 275,935 shares (Indirect, By Spouse)

Footnotes (1)

1. [object Object]

Key Figures

RSUs exercised: 4,582 units Shares withheld for taxes: 3 shares Direct common shares after transaction: 13,784,150 shares +2 more

5 metrics

RSUs exercised 4,582 units Converted into 4,582 common shares on 2026-05-21

Shares withheld for taxes 3 shares Delivered at $16.3434 per share on 2026-05-21

Direct common shares after transaction 13,784,150 shares Direct ownership following Form 4 transactions

Indirect common shares via spouse 275,935 shares Indirect ownership classified as By Spouse

RSU expiration No expiration date Footnote states RSUs have no expiration date

Key Terms

Restricted Share Units, tax-withholding disposition, derivative exercise/conversion, indirect ownership

4 terms

Restricted Share Units financial

"The filing shows Shawn Xiaohua Qu exercised 4,582 Restricted Share Units into common stock."

Restricted share units (RSUs) are a promise from a company to give an employee or service provider actual shares or cash equal to the shares after certain conditions are met, typically staying with the company for a set time or hitting performance targets. Think of them like a time-locked gift card that becomes usable only after you’ve earned it. For investors, RSUs matter because they align employee incentives with company performance and can increase the number of shares outstanding over time, diluting existing ownership and affecting earnings per share.

tax-withholding disposition financial

"3 common shares were delivered in a tax-withholding disposition coded as an F transaction."

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

"The RSU vesting is reported as a derivative exercise/conversion with an M transaction code."

indirect ownership financial

"An additional 275,935 common shares are reported as indirect ownership held By Spouse."

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^*

Qu Shawn Xiaohua

(Last) (First) (Middle)

C/O CANADIAN SOLAR INC

4273 KING STREET EAST, SUITE 102

(Street)

KITCHENER N2P 2E9

(City) (State) (Zip)

ONTARIO, CANADA

(Country)

2. Issuer Name and Ticker or Trading Symbol
Canadian Solar Inc. [ CSIQ ]

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

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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	05/21/2026		M		4,582	A	$0.00	13,784,153	D
Common Stock	05/21/2026		F		3	D	$16.3434	13,784,150	D
Common Stock								275,935	I	By Spouse

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 Share Units	$0.00	05/21/2026		M			4,582	05/20/2026	(1)	Common Stock	4,582	$0.00	40,437	D

Explanation of Responses:

1. These RSUs have no expiration date.

	/s/ Shawn (Xiaohua) Qu	05/22/2026
	** 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 Canadian Solar (CSIQ) report for Shawn Xiaohua Qu?

Canadian Solar reported that CTO Shawn Xiaohua Qu exercised 4,582 Restricted Share Units into common stock and delivered 3 common shares to satisfy tax obligations. These actions reflect routine equity compensation activity rather than open-market buying or selling.

How many Canadian Solar (CSIQ) shares does Shawn Xiaohua Qu hold after this Form 4?

After the reported transactions, Shawn Xiaohua Qu directly holds 13,784,150 Canadian Solar common shares and indirectly owns 275,935 additional shares through his spouse. These figures show his substantial ongoing equity stake in the company following the RSU vesting and related tax withholding.

What was the size of the RSU exercise reported for Canadian Solar (CSIQ)?

The filing shows Shawn Xiaohua Qu exercised 4,582 Restricted Share Units, converting them into 4,582 Canadian Solar common shares. This equity award vesting is part of his compensation and does not represent an open-market purchase, according to the transaction coding and description.

How were taxes handled on the Canadian Solar (CSIQ) RSU vesting?

To cover tax obligations from the RSU vesting, 3 Canadian Solar common shares were delivered at a transaction price of $16.3434 per share. This “F” code tax-withholding disposition is a standard mechanism and is not treated as an open-market sale in the filing.

What does the Form 4 say about the expiration of Canadian Solar (CSIQ) RSUs?

A footnote explains that the Restricted Share Units have no expiration date. This means the RSUs themselves do not lapse based on a time limit, although they can convert into Canadian Solar common shares upon vesting or other specified conditions under the company’s equity plan.