Proto Labs director granted 2,210 share units

Black Archie C. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Black Archie C. reported acquisition or exercise transactions in this Form 4 filing.

Proto Labs Inc director Archie C. Black received an equity award of 2,210 deferred stock units on Common Stock. These units were granted at no cash cost and increase his direct holdings to 28,428 shares. The units vest in full on the earlier of the first anniversary of the grant date or the 2027 Annual Meeting of Shareholders, and must be retained until his service on the Board of Directors ends.

Insider Trade Summary

Grant/Award: 2,210 shares

Grant/Award 1 txn

Insider Black Archie C.

Role Director

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

Holdings After Transaction: Common Stock — 28,428 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 Holdings after transaction: 28,428 shares Transaction price per unit: $0.00 +1 more

4 metrics

Deferred stock units granted 2,210 units Grant on Common Stock to director Archie C. Black

Holdings after transaction 28,428 shares Total direct Proto Labs Common Stock after award

Transaction price per unit $0.00 Equity award with no cash consideration

Transaction date 2026-05-19 Date of Form 4-reported grant

Key Terms

Deferred stock units, Annual Meeting of Shareholders, Board of Directors, Grant, award, or other acquisition

4 terms

Deferred stock units financial

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

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

"the 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 regulatory

"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.

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

FAQ

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

What insider transaction did Proto Labs (PRLB) report for Archie C. Black?

Proto Labs reported that director Archie C. Black received an award of 2,210 deferred stock units on Common Stock. The grant was recorded at a price of $0.00 per unit and is classified as a grant, award, or other acquisition under Form 4 rules.

How many Proto Labs (PRLB) shares does Archie C. Black hold after this award?

After the 2,210-unit award, Archie C. Black’s direct holdings total 28,428 shares of Proto Labs Common Stock. This figure reflects his position following the reported Form 4 transaction and helps investors understand the scale of the compensation-related grant.

When do Archie C. Black’s Proto Labs (PRLB) deferred stock units vest?

The 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. This schedule ties the award to both time-based service and a specific shareholder meeting milestone.

Are Archie C. Black’s Proto Labs (PRLB) deferred stock units subject to holding requirements?

Yes. The footnote states the deferred stock units must be retained until Archie C. Black’s service on Proto Labs’ Board of Directors ends. This requirement aligns director compensation with longer-term board service and maintains ongoing equity exposure while he remains a director.

Was Archie C. Black’s Proto Labs (PRLB) Form 4 transaction a market purchase or sale?

No. The Form 4 identifies the transaction as a grant, award, or other acquisition of 2,210 deferred stock units at $0.00 per unit. It reflects equity compensation, not an open-market buy or sell of Proto Labs shares by the director.

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

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Accepted by SEC EDGAR 05/21/2026 - 04:07 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^*

Black Archie C.

(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	28,428	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)