[Form 4] BlackLine, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Karole Morgan-Prager, Chief Legal and Administrative Officer of BlackLine, Inc. (BL), reported three related transactions on 08/20/2025 that reduced her beneficial ownership of Common Stock. Each transaction is marked with code "F" and shows shares disposed at a price of $52.23 per share. The filings indicate a total of withheld shares were used to satisfy the reporting person’s tax liability arising from RSU vesting, and the remaining beneficial ownership after each reported disposal is recorded in the filing.

Insights

Corporate Governance Expert

TL;DR Routine executive tax withholding on vested RSUs; no indication of discretionary sale beyond withholding.

The Form 4 shows code "F" transactions, which represent share dispositions under a tax withholding arrangement tied to vested restricted stock units. This is a standard, administrative action frequently seen when companies or reporting persons satisfy tax liabilities on equity compensation. There is no separate open-market sale reported, and the filing does not disclose any change in officer role or extraordinary governance action. For investors, this is procedural and not a signal of changed executive sentiment.

Executive Compensation Analyst

TL;DR Withholding of vested RSUs reduced share count held by the officer; transactions executed at $52.23 per share.

The report lists three withholding events tied to RSU vesting with identical per-share prices, reflecting tax-related share retention by the issuer or withholding agent. Such withholding reduces the officer’s post-transaction outstanding shares without producing separate cash proceeds to the reporting person. The filing lacks details on the number of shares withheld in aggregate beyond the per-line post-transaction balances, so precise total withheld must be inferred from the differences reported per line in the filing itself.

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

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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^*

Morgan-Prager Karole

(Last) (First) (Middle)

21300 VICTORY BLVD., 12TH FLOOR

(Street)

WOODLAND HILLS CA 91367

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
BLACKLINE, INC. [ BL ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF LEGAL AND ADMINISTRATIVE

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	08/20/2025		F		571(1)	D	$52.23	126,686	D
Common Stock	08/20/2025		F		776(1)	D	$52.23	125,910	D
Common Stock	08/20/2025		F		883(1)	D	$52.23	125,027	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. The reported shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of restricted stock units ("RSUs").

	/s/ Karole Morgan-Prager	08/21/2025
	** 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).
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