Proto Labs director granted 2,210 stock units

WEHRWEIN SVEN reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

WEHRWEIN SVEN reported acquisition or exercise transactions in this Form 4 filing.

Proto Labs Inc director Sven Wehrwein received an equity award of 2,210 deferred stock units on Common Stock. The award was granted at no cash cost per share and is a form of board compensation rather than an open-market purchase.

These deferred stock units vest in full on the earlier of the first anniversary of the grant date or the date of the 2027 Annual Meeting of Shareholders, and must be held until his service on the Board of Directors ends. Following this grant, Wehrwein directly holds 34,505 shares of Proto Labs common stock.

Insider Trade Summary

Grant/Award: 2,210 shares

Grant/Award 1 txn

Insider WEHRWEIN SVEN

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,210	$0.00	$0.00

Holdings After Transaction: Common Stock — 34,505 shares (Direct)

Footnotes (1)

1. F1. Deferred stock units that vest in full on the earlier of the first anniversary of the grant date or the date of the 2027 Annual Meeting of Shareholders but must be retained until the reporting person's service on the Company's Board of Directors ends.

Key Figures

Deferred stock units granted: 2,210 units Grant price per share: $0.0000 per share Shares held after transaction: 34,505 shares

3 metrics

Deferred stock units granted 2,210 units Grant of Common Stock deferred stock units to director

Grant price per share $0.0000 per share Non-cash equity award to director

Shares held after transaction 34,505 shares Director’s direct holdings after grant

Key Terms

Deferred stock units, Annual Meeting of Shareholders, Board of Directors

3 terms

Deferred stock units financial

"Deferred stock units that vest in full on the earlier of the first anniversary"

Deferred stock units are promises from a company to give an employee shares of stock at a future date, often after certain conditions are met or after leaving the company. They function like a form of delayed compensation, allowing employees to earn shares over time. For investors, they represent potential future ownership in the company, but do not provide immediate voting rights or dividends until the shares are actually received.

Annual Meeting of Shareholders regulatory

"earlier of the first anniversary of the grant date or the date of the 2027 Annual Meeting of Shareholders"

A yearly gathering where a company’s owners (shareholders) vote on key items like electing the board, approving executive pay, and ratifying auditors, and receive updates on performance and strategy. Think of it as an annual town hall for owners: it matters to investors because outcomes and disclosures can affect leadership, corporate direction, dividend and governance policies, and therefore the company’s risk and potential return.

Board of Directors financial

"must be retained until the reporting person's service on the Company's Board of Directors ends"

The Board of Directors is a group of people chosen by a company's owners to help make big decisions and oversee how the company is run. They act like a team of advisors or managers, making sure the company stays on track and meets its goals. Their choices can influence the company's success and how it grows.

FAQ

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

What did Proto Labs (PRLB) director Sven Wehrwein report in this Form 4?

Director Sven Wehrwein reported receiving 2,210 deferred stock units of Proto Labs common stock as a grant. The award is compensation for board service, was granted at no cash price, and increases his direct holdings to 34,505 shares after the transaction.

Is the Proto Labs (PRLB) Form 4 transaction an open-market purchase or a grant?

The transaction is a grant of 2,210 deferred stock units, not an open-market purchase. It is coded as a grant, award, or other acquisition and reflects routine non-cash director compensation rather than the director buying shares on the open market.

When do Sven Wehrwein’s 2,210 Proto Labs (PRLB) deferred stock units vest?

The 2,210 deferred stock units vest in full on the earlier of the first anniversary of the grant date or the 2027 Annual Meeting of Shareholders. This schedule ties vesting to either a one-year period or the company’s specified future shareholder meeting.

Are the Proto Labs (PRLB) deferred stock units immediately sellable by the director?

The deferred stock units must be retained until Sven Wehrwein’s service on Proto Labs’ Board of Directors ends. Even after vesting, this restriction means he cannot dispose of the units while he continues serving as a director of the company.

How many Proto Labs (PRLB) shares does Sven Wehrwein hold after this Form 4 transaction?

After the grant of 2,210 deferred stock units, Sven Wehrwein directly holds 34,505 shares of Proto Labs common stock. This figure reflects his direct ownership position reported in the Form 4 following the equity award transaction.

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

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Accepted by SEC EDGAR 05/21/2026 - 04:05 PM EDT 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^*

WEHRWEIN SVEN

(Last) (First) (Middle)

5540 PIONEER CREEK DRIVE

(Street)

MAPLE PLAIN MINNESOTA 55359

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/19/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/19/2026		A		2,210(1)	A	$0	34,505	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

Explanation of Responses:

1. Deferred stock units that vest in full on the earlier of the first anniversary of the grant date or the date of the 2027 Annual Meeting of Shareholders but must be retained until the reporting person's service on the Company's Board of Directors ends.

Remarks:

	/s/ W. Morgan Burns, Attorney-in-Fact	05/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)