Director Michael Ketslakh buys 13,041 Bridgeline Digital (BLIN) shares

Rhea-AI Filing Summary

Bridgeline Digital, Inc. director Michael Ketslakh reported open-market purchases of the company’s common stock. He bought 10,647 shares at $0.85 per share on February 25, 2026 and 2,394 shares at $0.85 per share on February 24, 2026. Following these transactions, he directly owned 486,883 shares.

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^*

Ketslakh Michael

(Last) (First) (Middle)

100 SYLVAN RD. SUITE G-700

(Street)

WOBURN MA 01801

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Bridgeline Digital, Inc. [ BLIN ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

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	02/24/2026		P		2,394	A	$0.85	476,236	D
Common Stock	02/25/2026		P		10,647	A	$0.85	486,883	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/ Michael Ketslakh	02/26/2026
	** 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 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 Bridgeline Digital (BLIN) director Michael Ketslakh report on this Form 4?

Director Michael Ketslakh reported buying Bridgeline Digital common stock in the open market. He disclosed two separate purchase transactions and his updated direct ownership, providing investors with transparency into his recent trading activity and current stake in the company.

How many Bridgeline Digital (BLIN) shares did Michael Ketslakh buy?

Michael Ketslakh bought a total of 13,041 Bridgeline Digital common shares. This includes 10,647 shares purchased on February 25, 2026 and 2,394 shares purchased on February 24, 2026, as disclosed in the Form 4 filing with the SEC.

At what price did Michael Ketslakh buy BLIN stock in these transactions?

He purchased Bridgeline Digital common stock at $0.85 per share in both transactions. The Form 4 shows this price for the 10,647 shares bought on February 25, 2026 and the 2,394 shares bought on February 24, 2026 in open-market purchases.

What is Michael Ketslakh’s Bridgeline Digital share ownership after these trades?

After the reported purchases, Michael Ketslakh directly owns 486,883 shares of Bridgeline Digital common stock. This figure reflects his holdings following the February 25, 2026 transaction, as disclosed in the Form 4 insider ownership table.

Were the BLIN share purchases by Michael Ketslakh direct or through another entity?

The filing shows the purchases as directly owned by Michael Ketslakh. The ownership code is listed as “D” for direct, and there are no footnotes indicating that the shares are held through a separate entity, trust, or partnership.