Proto Labs COO reports equity grants, tax share offset

Proto Labs Inc Chief Operations Officer Michael R. Kenison reported equity compensation transactions on February 25, 2026.

Rhea-AI Filing Summary

Proto Labs Inc Chief Operations Officer Michael R. Kenison reported equity compensation transactions on February 25, 2026. He received a grant of 4,404 employee stock options and a separate award of 2,415 shares of common stock, both recorded at a price of $0.00 as they are compensation grants.

The filing also shows a disposition of 531 shares of common stock at $62.63 per share classified as a tax-withholding transaction, used to satisfy tax obligations related to the award. After these transactions, his direct common stock holdings totaled 27,186 shares. Footnotes state that 25% of the restricted stock units vest on February 25, 2027, with additional 25% portions vesting on each February 25th thereafter until fully vested.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Kenison Michael R.

Role Chief Operations Officer

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (right to buy)	4,404	$0.00	$0.00
Grant/Award	Common Stock	2,415	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	531	$62.63	$33K

Holdings After Transaction: Employee Stock Option (right to buy) — 4,404 contracts (Direct); Common Stock — 27,186 shares (Direct)

Footnotes (2)

1. F1. Restricted Stock Units that vest as follows: 25% of shares subject to the award will vest on February 25, 2027, and on each February 25th thereafter until all shares subject to the award are fully vested.
2. F2. 25% of shares subject to the award will vest on February 25, 2027, and on each February 25th thereafter until all shares subject to the award are fully vested.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did Proto Labs (PRLB) COO Michael R. Kenison report?

Michael R. Kenison reported equity compensation awards and a tax-related share disposition. He received 4,404 employee stock options and 2,415 shares of common stock, and 531 shares were disposed of to cover tax liabilities tied to these awards.

Were the Proto Labs (PRLB) insider transactions open-market buys or sells?

The reported Proto Labs transactions were not open-market buys or sells. They consisted of compensation grants of options and shares, plus a tax-withholding disposition of 531 shares used to satisfy tax obligations related to the equity awards.

How many Proto Labs (PRLB) shares does Michael R. Kenison hold after these transactions?

After the reported transactions, Michael R. Kenison directly holds 27,186 shares of Proto Labs common stock. This figure reflects the new equity grants and the 531-share tax-withholding disposition recorded in the Form 4 filing on February 25, 2026.

What are the vesting terms of the Proto Labs (PRLB) restricted stock units granted to Kenison?

The restricted stock units vest over four years. According to the footnotes, 25% of the shares vest on February 25, 2027, with an additional 25% vesting on each February 25th thereafter until the entire award is fully vested.

What does the tax-withholding disposition in the Proto Labs (PRLB) Form 4 mean?

The tax-withholding disposition reflects 531 shares delivered at $62.63 per share to cover tax liabilities. This is coded as a Form 4 “F” transaction, indicating payment of exercise price or tax liability by delivering securities, not an open-market sale.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/27/2026 - 04:16 PM EST Learn about SEC filing dates

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^*

Kenison Michael R.

(Last) (First) (Middle)

5540 PIONEER CREEK DRIVE

(Street)

MAPLE PLAIN MN 55359

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Proto Labs Inc [ PRLB ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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	02/25/2026		A		2,415(1)	A	$0	27,717	D
Common Stock	02/25/2026		F		531	D	$62.63	27,186	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
Employee Stock Option (right to buy)	$62.63	02/25/2026		A		4,404		(2)	02/25/2036	Common Stock	4,404	$0	4,404	D

Explanation of Responses:

1. Restricted Stock Units that vest as follows: 25% of shares subject to the award will vest on February 25, 2027, and on each February 25th thereafter until all shares subject to the award are fully vested.

2. 25% of shares subject to the award will vest on February 25, 2027, and on each February 25th thereafter until all shares subject to the award are fully vested.

Remarks:

	/s/ W. Morgan Burns, Attorney-in-Fact	02/27/2026
	** 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.