BlackLine (BL) director Mika Yamamoto sells 3,000 common shares in open market

Rhea-AI Filing Summary

BLACKLINE, INC. director Mika Yamamoto reported an open-market sale of 3,000 shares of Common Stock at $28.4752 per share. After this transaction, she directly holds 16,692 shares. The filing shows a single sale transaction and no derivative positions.

Insider Trade Summary

Net Seller: 3,000 shares ($85,426)

Net Sell 1 txn

Insider Yamamoto Mika

Role null

Sold 3,000 shs ($85K)

Type	Security	Shares	Price	Value
Sale	Common Stock	3,000	$28.4752	$85K

Holdings After Transaction: Common Stock — 16,692 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 3,000 shares Sale price: $28.4752 per share Shares owned after transaction: 16,692 shares +1 more

4 metrics

Shares sold 3,000 shares Open-market sale of Common Stock

Sale price $28.4752 per share Price for the 3,000 shares sold

Shares owned after transaction 16,692 shares Direct holdings after sale

Net shares sold 3,000 shares Net change in position per transaction summary

Key Terms

Common Stock, open-market sale, Form 4, transaction code "S"

4 terms

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

transaction code "S" financial

"transaction_code: "S""

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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^*

Yamamoto Mika

(Last) (First) (Middle)

21300 VICTORY BLVD., 12TH FLOOR

(Street)

WOODLAND HILLS CALIFORNIA 91367

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/05/2026

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	06/05/2026		S		3,000	D	$28.4752	16,692	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:

	/s/ Karole Morgan-Prager, Attorney-in-Fact	06/08/2026
	** 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 BLACKLINE (BL) disclose for Mika Yamamoto?

BLACKLINE reported that director Mika Yamamoto sold 3,000 shares of Common Stock in an open-market transaction. The shares were sold at $28.4752 per share, and this Form 4 reflects a single sale on the reported date.

At what price were the BLACKLINE (BL) shares sold in this Form 4?

The reported sale of BLACKLINE Common Stock by Mika Yamamoto was executed at $28.4752 per share. This figure represents the transaction price per share for the 3,000 shares sold in the open-market transaction disclosed in the filing.

How many BLACKLINE (BL) shares does Mika Yamamoto own after the sale?

Following the reported transaction, Mika Yamamoto directly owns 16,692 shares of BLACKLINE Common Stock. This post-transaction balance is disclosed in the Form 4 and reflects her remaining direct holdings after selling 3,000 shares.

Was the BLACKLINE (BL) insider transaction a buy or a sell?

The Form 4 for BLACKLINE shows a sell transaction. Director Mika Yamamoto executed an open-market sale of 3,000 shares of Common Stock, identified with transaction code "S" and classified as a sale in the filing’s summary data.

Does the BLACKLINE (BL) Form 4 include any derivative transactions?

The disclosed Form 4 does not include any derivative security transactions. The derivative summary is empty, indicating no option exercises, conversions, or other derivative-related trades were reported alongside the common stock sale.