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Harvard Bioscience (NASDAQ: HBIO) awards director 16,556 RSUs

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

DENELSKY STEPHEN J reported acquisition or exercise transactions in this Form 4 filing.

Harvard Bioscience director Stephen J. Denelsky received a grant of 16,556 restricted stock units (RSUs) of common stock. The award vests in full either immediately before the company’s next annual meeting or one year from the grant date, whichever occurs first.

After this award, Denelsky holds 37,556 shares and RSUs in total, including 10,000 shares of common stock purchased on March 17, 2026 and 11,000 RSUs scheduled to fully vest on September 5, 2026. The filing notes that these 11,000 RSUs were adjusted to reflect a 10-for-1 reverse stock split that took place on March 13, 2026.

Positive

  • None.

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Insider DENELSKY STEPHEN J
Role null
Type Security Shares Price Value
Grant/Award Common Stock 16,556 $0.00 --
Holdings After Transaction: Common Stock — 37,556 shares (Direct, null)
Footnotes (1)
  1. Represents an award of 16,556 restricted stock units that vests in full (i) immediately prior to the Company's next annual meeting; or (ii) one year from the date of grant, whichever is earlier. Includes (a) the award described in footnote (1) above, (b) 10,000 shares of common stock purchased on March 17, 2026, and (c) 11,000 restricted stock units that fully vest on September 5, 2026. On March 13, 2026, the common stock of Harvard Bioscience, Inc. underwent a reverse stock split in a ratio of 10-for-1. The 11,000 restricted stock units referenced in Footnote 2(c) were previously reported as covering 110,000 restricted stock units. These numbers have been adjusted to reflect the stock split that occurred on March 13, 2026.
RSU grant size 16,556 RSUs Award of restricted stock units to director on June 9, 2026
Holdings after transaction 37,556 shares/RSUs Total reported holdings following the RSU award
Previously purchased shares 10,000 shares Common stock purchased on March 17, 2026
Existing RSUs 11,000 RSUs Restricted stock units fully vesting on September 5, 2026
Reverse stock split ratio 10-for-1 Harvard Bioscience reverse stock split on March 13, 2026
restricted stock units financial
"Represents an award of 16,556 restricted stock units that vests in full"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
reverse stock split financial
"underwent a reverse stock split in a ratio of 10-for-1"
A reverse stock split is when a company reduces the number of its shares outstanding, making each share more valuable. For example, if you own 100 shares worth $1 each, a 1-for-10 reverse split would turn your 100 shares into 10 shares worth $10 each. Companies often do this to boost their stock price and appear more stable to investors.
vests in full financial
"restricted stock units that vests in full (i) immediately prior to the Company's next annual meeting"
annual meeting financial
"immediately prior to the Company's next annual meeting; or (ii) one year from the date of grant"
A company's annual meeting is a yearly gathering where owners (shareholders) and the board review performance, ask questions, and vote on key matters like electing directors, approving auditor choices, and sometimes setting pay or dividend policies. For investors it matters because decisions made and votes cast can change who runs the company, influence strategy and payouts, and affect the value or direction of their investment—similar to a homeowners’ meeting where rules and leaders that shape your property’s value are decided.
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SEC Form 4
FORM 4UNITED 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*
DENELSKY STEPHEN J

(Last)(First)(Middle)
C/O HARVARD BIOSCIENCE, INC.
84 OCTOBER HILL ROAD

(Street)
HOLLISTON MASSACHUSETTS 01746

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
HARVARD BIOSCIENCE INC [ HBIO ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/09/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/09/2026A16,556(1)A$0.0037,556(2)(3)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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents an award of 16,556 restricted stock units that vests in full (i) immediately prior to the Company's next annual meeting; or (ii) one year from the date of grant, whichever is earlier.
2. Includes (a) the award described in footnote (1) above, (b) 10,000 shares of common stock purchased on March 17, 2026, and (c) 11,000 restricted stock units that fully vest on September 5, 2026.
3. On March 13, 2026, the common stock of Harvard Bioscience, Inc. underwent a reverse stock split in a ratio of 10-for-1. The 11,000 restricted stock units referenced in Footnote 2(c) were previously reported as covering 110,000 restricted stock units. These numbers have been adjusted to reflect the stock split that occurred on March 13, 2026.
/s/ Stephen DeNelsky06/11/2026
** Signature of Reporting PersonDate
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 did HBIO director Stephen Denelsky report in this Form 4 filing?

Stephen Denelsky reported receiving 16,556 restricted stock units of Harvard Bioscience common stock. The RSUs are a compensation-related equity award, not an open-market purchase, and increase his total reported holdings to 37,556 shares and RSUs combined.

How do the 16,556 RSUs granted to HBIO director Denelsky vest?

The 16,556 restricted stock units vest in full on the earlier of two dates. They vest either immediately before Harvard Bioscience’s next annual meeting or one year from the grant date, providing a time-based incentive tied to continued board service.

What are Stephen Denelsky’s total reported holdings in HBIO after this award?

After the RSU grant, Stephen Denelsky’s reported holdings total 37,556 shares and RSUs. This includes the new 16,556-unit award, 10,000 shares of common stock purchased on March 17, 2026, and 11,000 RSUs scheduled to vest on September 5, 2026.

How did Harvard Bioscience’s reverse stock split affect Denelsky’s RSUs?

On March 13, 2026, Harvard Bioscience completed a 10-for-1 reverse stock split. As a result, Denelsky’s previously reported 110,000 restricted stock units were adjusted to 11,000 RSUs, aligning the award size with the new post-split share count.

Is the HBIO Form 4 transaction a market purchase or sale of shares?

No, the Form 4 reports a grant of 16,556 restricted stock units as compensation, not a market trade. The transaction price per share is shown as zero, reflecting that the shares were awarded rather than bought or sold on the open market.