STOCK TITAN

Harvard Bioscience (HBIO) CFO adds 5,000 shares at $5.00

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

Rhea-AI Filing Summary

Harvard Bioscience Chief Financial Officer Mark T. Frost bought 5,000 shares of common stock in an open-market purchase at $5.00 per share. Following this transaction, he directly owns a total of 17,500 shares, including 10,000 restricted stock units scheduled to vest on May 12, 2026.

Positive

  • None.

Negative

  • None.
Insider Frost Mark T
Role Chief Financial Officer
Bought 5,000 shs ($25K)
Type Security Shares Price Value
Purchase Common Stock 5,000 $5.00 $25K
Holdings After Transaction: Common Stock — 17,500 shares (Direct)
Footnotes (1)
  1. Includes (a) 5,000 shares of common stock purchased on March 16, 2026, (b) 10,000 restricted stock units that will vest on May 12, 2026, and (c) 2,500 shares of common stock beneficially owned by the Reporting Person. On March 13, 2026, the common stock of Harvard Bioscience, Inc. underwent a reverse stock split in a ratio of 10-for-1. The 10,000 restricted stock units referenced in Footnote 1(b) were previously reported as covering 100,000 restricted stock units and the 2,500 shares of common stock referenced in Footnote 1(c) were previously reported as covering 25,000 shares of common stock. These numbers have been adjusted to reflect the stock split that occurred on March 13, 2026.
Shares purchased 5,000 shares Open-market purchase on March 16, 2026
Purchase price $5.00 per share Common Stock transaction code P
Total shares after transaction 17,500 shares Direct holdings including RSUs and common stock
Restricted stock units 10,000 units RSUs scheduled to vest on May 12, 2026
Reverse stock split ratio 10-for-1 Common stock reverse split on March 13, 2026
restricted stock units financial
"10,000 restricted stock units that will vest on May 12, 2026"
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
"the common stock of Harvard Bioscience, Inc. 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.
beneficially owned financial
"2,500 shares of common stock beneficially owned by the Reporting Person"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
open-market purchase financial
"transaction_action: "open-market purchase""
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
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*
Frost Mark T

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026
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 Stock03/16/2026P5,000A$517,500(1)(2)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. Includes (a) 5,000 shares of common stock purchased on March 16, 2026, (b) 10,000 restricted stock units that will vest on May 12, 2026, and (c) 2,500 shares of common stock beneficially owned by the Reporting Person.
2. On March 13, 2026, the common stock of Harvard Bioscience, Inc. underwent a reverse stock split in a ratio of 10-for-1. The 10,000 restricted stock units referenced in Footnote 1(b) were previously reported as covering 100,000 restricted stock units and the 2,500 shares of common stock referenced in Footnote 1(c) were previously reported as covering 25,000 shares of common stock. These numbers have been adjusted to reflect the stock split that occurred on March 13, 2026.
/s/ Mark Frost04/01/2026
** 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 insider transaction did Harvard Bioscience (HBIO) report for its CFO?

Harvard Bioscience CFO Mark T. Frost bought 5,000 common shares. He purchased the shares in an open-market transaction at $5.00 per share, increasing his direct holdings to a total of 17,500 shares, including restricted stock units.

At what price did the Harvard Bioscience (HBIO) CFO buy shares?

The CFO purchased shares at $5.00 per share. On March 16, 2026, Mark T. Frost executed an open-market purchase of 5,000 shares of Harvard Bioscience common stock at a transaction price of $5.0000 per share.

How many Harvard Bioscience (HBIO) shares does the CFO own after this trade?

After the transaction, the CFO owns 17,500 shares. This total includes 5,000 newly purchased shares, 10,000 restricted stock units scheduled to vest on May 12, 2026, and 2,500 shares of common stock beneficially owned.

What type of transaction did the Harvard Bioscience (HBIO) CFO execute?

The transaction was an open-market purchase of common stock. The Form 4 classifies the March 16, 2026 activity under code “P,” meaning a purchase in an open market or private transaction, rather than a sale or derivative exercise.

Did a reverse stock split affect the Harvard Bioscience (HBIO) CFO’s reported holdings?

Yes, a 10-for-1 reverse stock split adjusted prior figures. Footnotes explain that restricted stock units and previously reported common shares were divided by 10 to reflect a reverse stock split effective March 13, 2026.

What future vesting is disclosed for the Harvard Bioscience (HBIO) CFO’s equity awards?

10,000 restricted stock units are scheduled to vest on May 12, 2026. These units are included in the 17,500 total shares reported as beneficially owned following the March 16, 2026 open-market purchase.