[Form 4] BlackLine, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Insider transaction summary: Therese Tucker, Co-CEO and director of BlackLine, Inc. (BL), had restricted stock units vest and 2,219 and 2,012 shares were withheld on 08/20/2025 to cover tax withholding at a price of $52.23 per share. After those dispositions, Therese Tucker directly beneficially owned 357,370 and 355,358 shares as reported on separate lines, and held substantial indirect positions through multiple trusts, including 1,509,881 shares in the Brian and Therese Tucker Living Trust.

The filing states the share withholding was to satisfy tax liabilities tied to RSU vesting. No derivative transactions or other purchases/sales are reported. The form is a routine disclosure of tax-withholding disposition following equity vesting.

Positive

• Maintained substantial indirect ownership through multiple trusts, including 1,509,881 shares in the Brian and Therese Tucker Living Trust
• Transaction limited to tax withholding on RSU vesting, indicating no active market sell-off by the insider

Negative

• Disposition of 4,231 shares via withholding to cover tax liabilities at $52.23 per share on 08/20/2025

Insights

Financial Analyst

TL;DR: Small tax-related share withholding following RSU vesting; large indirect holdings remain concentrated in family trusts.

The transaction is a common administrative sale to satisfy tax withholding on vested RSUs, totaling 4,231 shares disposed at $52.23 per share on 08/20/2025. Such withholdings generally have negligible market impact. Notably, the reporting person retains large indirect positions, including 1,509,881 shares in the Brian and Therese Tucker Living Trust and other trust holdings aggregating several hundred thousand shares, indicating continued substantial economic exposure to BL equity.

Corporate Governance Expert

TL;DR: Transaction reflects routine tax withholding on vested RSUs; no governance red flags or leadership changes disclosed.

The Form 4 indicates the sale was executed solely to cover tax obligations from RSU vesting, per the provided explanation. The reporting person is both Co-CEO and a director, and the disclosure shows multiple indirect family trust holdings, which suggests concentrated insider ownership but no change in control or executive status. There are no amended filings or additional compensatory arrangements disclosed in this form.

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^*

Tucker Therese

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CO-CEO

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		2,219(1)	D	$52.23	357,370	D
Common Stock	08/20/2025		F		2,012(1)	D	$52.23	355,358	D
Common Stock								100,178	I	Brian and Therese Tucker Charitable Remainder Trust
Common Stock								1,509,881	I	Brian and Therese Tucker Living Trust
Common Stock								54,074	I	Claire Seimetz 2015 Trust
Common Stock								577,200	I	Isaac Tucker 2012 Irrevocable Trust
Common Stock								577,200	I	Roseanna Tucker 2012 Irrevocable Trust
Common Stock								79,516	I	Tucker Family CLAT
Common Stock								874,128	I	Tucker Legacy Trust
Common Stock								129,897	I	Tucker Legacy Trust II
Common Stock								250,916	I	Tucker Seimetz Safety Net Grat

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, Attorney-in-Fact	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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What did Therese Tucker report on Form 4 for BlackLine (BL)?

The filing reports withholding of 2,219 and 2,012 shares on 08/20/2025 to cover tax liabilities from vested RSUs, at $52.23 per share.

Why were shares disposed of according to the Form 4?

The Explanation of Responses states the shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of restricted stock units.

How many shares does Therese Tucker beneficially own indirectly?

The filing lists significant indirect holdings, including 1,509,881 shares in the Brian and Therese Tucker Living Trust and additional trust holdings reported in the filing.

Were any derivative transactions reported on this Form 4?

No derivative securities (options, warrants, convertible instruments) are reported in Table II of this Form 4.

When was the transaction executed?

The transaction date reported is 08/20/2025, and the form is signed on 08/21/2025 by an attorney-in-fact.