Collegium (COLL) EVP has 8,840 shares withheld for RSU tax payment

Rhea-AI Filing Summary

Collegium Pharmaceutical executive David Dieter reported a routine share disposition tied to tax withholding. On the vesting of restricted stock units, 8,840 shares of common stock were withheld by the company at $35.72 per share to cover applicable withholding taxes. After this non-market transaction, he directly holds 68,231 shares of Collegium Pharmaceutical common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Dieter David

Role EVP & General Counsel

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	8,840	$35.72	$316K

Holdings After Transaction: Common Stock — 68,231 shares (Direct)

Footnotes (1)

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Key Figures

Shares withheld for taxes: 8,840 shares Withholding price per share: $35.72/share Shares held after transaction: 68,231 shares

3 metrics

Shares withheld for taxes 8,840 shares Withheld upon RSU vesting for tax obligations

Withholding price per share $35.72/share Value used for tax-withholding disposition

Shares held after transaction 68,231 shares Direct holdings of common stock after withholding

Key Terms

restricted stock units, withholding taxes, tax-withholding disposition

3 terms

restricted stock units financial

"upon the vesting of 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.

withholding taxes financial

"withheld by the Issuer to satisfy applicable withholding taxes"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

tax-withholding disposition financial

"transaction_action: "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.

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^*

Dieter David

(Last) (First) (Middle)

C/O COLLEGIUM PHARMACEUTICAL, INC.

100 TECHNOLOGY CENTER DRIVE

(Street)

STOUGHTON MASSACHUSETTS 02072

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
COLLEGIUM PHARMACEUTICAL, INC [ COLL ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & General Counsel

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/17/2026

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	03/17/2026		F		8,840(1)	D	$35.72	68,231	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

Explanation of Responses:

1. Shares withheld by the Issuer to satisfy applicable withholding taxes upon the vesting of restricted stock units.

	/s/ Colleen Tupper as Attorney-In-Fact For David Dieter	04/03/2026
	** 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 transaction did COLL executive David Dieter report?

EVP & General Counsel David Dieter reported a routine tax-related disposition. 8,840 Collegium Pharmaceutical (COLL) shares were withheld by the company upon RSU vesting to cover applicable withholding taxes.

Was the COLL insider transaction an open-market sale of shares?

No, the COLL transaction was not an open-market sale. Shares were withheld by Collegium Pharmaceutical to satisfy tax obligations when restricted stock units vested, a standard non-market mechanism.

How many COLL shares were withheld for taxes in this filing?

A total of 8,840 Collegium Pharmaceutical (COLL) common shares were withheld. The withholding occurred at $35.72 per share to satisfy applicable taxes related to vesting restricted stock units.

How many COLL shares does David Dieter own after this transaction?

Following the tax-withholding transaction, David Dieter directly holds 68,231 shares of Collegium Pharmaceutical (COLL) common stock, as reported in the insider filing after the RSU vesting event.

What does transaction code F mean in the COLL Form 4 filing?

Transaction code F indicates a payment of exercise price or tax liability using securities. In this COLL filing, it reflects shares withheld to cover taxes when restricted stock units vested, not a discretionary market trade.