Proto Labs (PRLB) director receives 2,210 restricted stock units as equity grant

Rhea-AI Filing Summary

Proto Labs director Donald G. Krantz reported an acquisition of company stock through a compensation grant. He received 2,210 shares of Common Stock in the form of restricted stock units at a price of $0.00 per share, reflecting an equity award rather than a market purchase.

These restricted 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. After this award, Krantz directly holds 26,863 shares of Proto Labs common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider KRANTZ DONALD G

Role null

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

Holdings After Transaction: Common Stock — 26,863 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSU grant size: 2,210 shares Grant price: $0.00 per share Post-transaction holdings: 26,863 shares +1 more

4 metrics

RSU grant size 2,210 shares Restricted stock units awarded to director

Grant price $0.00 per share Equity compensation, not market purchase

Post-transaction holdings 26,863 shares Common Stock held directly after award

Vesting condition Earlier of 1-year or 2027 meeting RSUs vest by first anniversary or 2027 Annual Meeting

Key Terms

Restricted stock units, Annual Meeting of Shareholders, Grant, award, or other acquisition, Common Stock

4 terms

Restricted stock units financial

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

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.

Annual Meeting of Shareholders financial

"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.

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

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^*

KRANTZ DONALD G

(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	26,863	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. Restricted 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.

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)

FAQ

What did Proto Labs (PRLB) director Donald G. Krantz report in this Form 4?

Director Donald G. Krantz reported receiving 2,210 shares of Proto Labs Common Stock as a restricted stock unit award. The grant was at $0.00 per share, reflecting equity compensation rather than an open-market purchase of PRLB shares.

How many Proto Labs (PRLB) shares does Donald G. Krantz hold after this transaction?

After the reported grant, Donald G. Krantz directly holds 26,863 shares of Proto Labs Common Stock. This total includes the 2,210 restricted stock units awarded in the transaction, which are subject to vesting conditions tied to time and the 2027 Annual Meeting.

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

The restricted 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 time-based vesting aligns the director’s compensation with longer-term company performance and board service.

Was cash paid for the Proto Labs (PRLB) shares reported in this Form 4?

No cash was paid for these shares; the transaction price is listed as $0.00 per share. The 2,210 Proto Labs shares were granted as restricted stock units, representing an equity compensation award rather than a cash-funded purchase in the open market.

Does this Proto Labs (PRLB) Form 4 show a buy or a grant for the director?

The Form 4 shows a grant of restricted stock units, coded as an acquisition under a grant or award, not an open-market buy. The transaction code is “A,” indicating equity compensation awarded to director Donald G. Krantz by Proto Labs.