[Form 3] HARVARD BIOSCIENCE INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Stephen J. DeNelsky, a director of Harvard Bioscience, Inc. (HBIO), filed an Initial Statement of Beneficial Ownership on 09/05/2025. The filing is a Form 3 and states that no securities are beneficially owned by the reporting person at the time of the report. The submission is signed by Stephen DeNelsky on 10/07/2025 and includes an Exhibit 24 power of attorney reference.

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^*

DENELSKY STEPHEN J

(Last) (First) (Middle)

C/O HARVARD BIOSCIENCE, INC.

84 OCTOBER HILL ROAD

(Street)

HOLLISTON MA 01746

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/05/2025

3. Issuer Name and Ticker or Trading Symbol
HARVARD BIOSCIENCE INC [ HBIO ]

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

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

5. 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 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:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Stephen DeNelsky	10/07/2025
	** 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 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.

FAQ

What did Stephen J. DeNelsky disclose on Form 3 for HBIO?

The Form 3 filed for HBIO on 09/05/2025 states that no securities are beneficially owned by Stephen J. DeNelsky.

What is the reporting relationship of Stephen J. DeNelsky to HBIO?

The filing lists Stephen J. DeNelsky as a Director of Harvard Bioscience, Inc.

When was the Form 3 signed by the reporting person?

The Form 3 is signed by Stephen DeNelsky on 10/07/2025.

Does the Form 3 list any derivative or non-derivative holdings?

No. The Form 3 explicitly states no securities are beneficially owned, and no entries appear in the non-derivative or derivative tables.

Is there any power of attorney referenced in the filing?

Yes. The filing references Exhibit 24 - Power of Attorney in the remarks.