BlackLine (BL) director Duncan Storm submits initial insider ownership Form 3

Rhea-AI Filing Summary

BLACKLINE, INC. director Duncan Storm filed an initial statement of beneficial ownership on Form 3. The filing identifies him as a director but does not report any buy, sell, or other insider transactions or derivative positions in BlackLine securities in the provided data.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Duncan Storm

(Last) (First) (Middle)

21300 VICTORY BLVD., 12TH FLOOR

(Street)

WOODLAND HILLS CALIFORNIA 91367-7734

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/11/2026

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

3a. Foreign Trading Symbol

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

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

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

This Form 3 reports Mr. Duncan's appointment to the Issuer's board of directors on March 11, 2026. The filing was delayed due to a procedural delay in Mr. Duncan receiving the requisite EDGAR access codes from the SEC. This Form 3 was filed promptly upon receipt of the codes.

No securities are beneficially owned.

	/s/ Karole Morgan-Prager, Attorney-in-Fact	03/26/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does the BlackLine (BL) Form 3 filed by Duncan Storm show?

The Form 3 for BlackLine (BL) shows that Duncan Storm is a director and has submitted an initial statement of beneficial ownership. The provided data does not list any specific transactions or derivative positions associated with him.

Does BlackLine (BL) director Duncan Storm report any stock transactions on this Form 3?

No transactions are reported for BlackLine (BL) director Duncan Storm on this Form 3. The transaction summary shows zero buys, zero sells, zero exercises, and no gifts or tax withholdings in the provided information.

What is the purpose of Duncan Storm’s Form 3 filing for BlackLine (BL)?

Duncan Storm’s Form 3 for BlackLine (BL) serves as his initial statement of beneficial ownership as a director. It establishes his reporting status under insider ownership rules, even though no specific trades or derivative holdings are listed in the provided data.

Are there any derivative securities reported for Duncan Storm in BlackLine (BL) on this Form 3?

The Form 3 data for BlackLine (BL) indicates no derivative securities for Duncan Storm. The derivative summary is empty, and the derivative transaction count and exercise-related fields are all reported as zero.

Does the BlackLine (BL) Form 3 for Duncan Storm mention Rule 10b5-1 trading plans?

The Form 3 information for BlackLine (BL) and director Duncan Storm includes an empty footnote entry and does not reference any Rule 10b5-1 trading plans or pre-arranged trading arrangements in the provided content.