Proto Labs (PRLB) COO exercises options, sells 3,048 shares

Rhea-AI Filing Summary

Proto Labs, Inc. (PRLB)11/25/2025, the officer exercised an employee stock option for 3,048 shares of common stock at an exercise price of $33.84 per share, then sold 3,048 shares of common stock in open-market transactions at a weighted average price of $50.1741 per share. After these transactions, the officer directly beneficially owned 28,898 shares of Proto Labs common stock and held 4,664 employee stock options following the reported exercise. The filing notes that the trades were made under a Rule 10b5-1 trading plan adopted on August 15, 2025, and that the ownership total includes 57 shares acquired through the company’s employee stock purchase plan.

11/26/2025 - 05:37 PM

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).

X

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)
11/25/2025

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	11/25/2025		M		3,048	A	$33.84	31,946(1)	D
Common Stock	11/25/2025		S		3,048(2)	D	$50.1741(3)	28,898	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)	$33.84	11/25/2025		M			3,048	(4)	02/14/2033	Common Stock	3,048	$0	4,664	D

Explanation of Responses:

1. Includes 57 shares of Common Stock of the issuer purchased on November 15, 2025 through the issuer's Employee Stock Purchase Plan program.

2. These shares were acquired and sold pursuant to Reporting Person's 10b5-1 plan adopted August 15, 2025.

3. Reflects the weighted average price of 3,048 shares of Common Stock of the issuer sold by the Reporting Person in multiple transactions on November 25, 2025 with sale prices ranging from $50.00 to $50.53 per share. The Reporting Person undertakes to provide upon request by U.S. Securities and Exchange Commission staff, the issuer, or a securityholder of the issuer full information regarding the number of shares sold at each separate price.

4. 25% of shares subject to the award will vest on February 13, 2024, and on each February 13th thereafter until all shares subject to the award are fully vested.

Remarks:

	/s/ Kareem S. Tawfic, Attorney-in-Fact	11/26/2025
	** 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 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 insider transaction did Proto Labs (PRLB) report in this Form 4?

The Chief Operations Officer exercised an employee stock option for 3,048 shares at $33.84 and sold 3,048 shares of Proto Labs common stock.

At what prices were the Proto Labs (PRLB) shares bought and sold?

The option was exercised at an exercise price of $33.84 per share. The 3,048 shares of common stock were sold at a weighted average price of $50.1741 per share, with individual sale prices ranging from $50.00 to $50.53.

How many Proto Labs (PRLB) shares does the reporting officer own after the transaction?

Following the reported transactions, the officer directly beneficially owned 28,898 shares of Proto Labs common stock and held 4,664 employee stock options.

Was the Proto Labs (PRLB) insider trade made under a Rule 10b5-1 plan?

Yes. The filing states that the shares were acquired and sold under a Rule 10b5-1 trading plan adopted on August 15, 2025.

What does the weighted average sale price in the Proto Labs (PRLB) Form 4 mean?

The Form 4 reports a weighted average sale price of $50.1741 for 3,048 shares sold in multiple transactions, with prices ranging between $50.00 and $50.53 per share.

Does the Proto Labs (PRLB) Form 4 mention shares from an employee stock purchase plan?

Yes. The filing notes that the ownership amount includes 57 shares of common stock purchased on November 15, 2025 through the company’s Employee Stock Purchase Plan.