[Form 4] BLACKLINE, INC. Insider Trading Activity

Rhea-AI Filing Summary

BlackLine, Inc. insider filing: A director and officer reported automatic share withholdings tied to restricted stock units. On 11/20/2025, the reporting person had 2,218 and 2,012 shares of BlackLine common stock withheld at a price of $53.49 per share to cover tax obligations upon RSU vesting. After these transactions, the individual directly owned 351,128 common shares.

In addition to the direct holdings, the filing lists sizeable indirect ownership through various family and trust entities, including the Brian and Therese Tucker Charitable Remainder Trust, the Brian and Therese Tucker Living Trust, several 2012 irrevocable trusts, and other family trusts. The filing notes that the share withholdings were solely to satisfy tax liabilities associated with RSU vesting.

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

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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)
	Founder

3. Date of Earliest Transaction (Month/Day/Year)
11/20/2025

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	11/20/2025		F		2,218(1)	D	$53.49	353,140	D
Common Stock	11/20/2025		F		2,012(1)	D	$53.49	351,128	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	11/24/2025
	** 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.
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.

FAQ

What did the BlackLine (BL) insider report in this Form 4?

The insider reported automatic withholdings of BlackLine common stock to cover tax liabilities triggered by the vesting of restricted stock units, along with updated direct and indirect share holdings.

How many BlackLine (BL) shares were withheld for taxes in this filing?

On 11/20/2025, a total of 2,218 and 2,012 BlackLine common shares were withheld, each at a price of $53.49 per share, to satisfy RSU-related tax obligations.

How many BlackLine (BL) shares does the insider own directly after these transactions?

Following the reported tax-withholding transactions, the insider directly owns 351,128 shares of BlackLine common stock.

What is the insider’s relationship to BlackLine (BL)?

The reporting person is both a Director and an Officer of BlackLine and is also identified as a Founder.

Does this BlackLine (BL) Form 4 indicate an open-market sale by the insider?

No. The filing explains that the reported shares were withheld by the issuer to cover the insider’s tax liability from the vesting of restricted stock units (RSUs), rather than discretionary open-market sales.

What indirect holdings in BlackLine (BL) are disclosed in this Form 4?

The filing lists indirect ownership in BlackLine shares through multiple trusts, including the Brian and Therese Tucker Charitable Remainder Trust, the Brian and Therese Tucker Living Trust, several 2012 irrevocable trusts, and additional family trusts.