Donald G. Krantz - 19 May 2026 Form 4 Insider Report for Proto Labs Inc (PRLB)

Reporting relationship: Director
Issuer ticker: PRLB
Reported as of: 19 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 May 2026, 16:04:52 UTC
Prior SEC filing: 28 May 2025
Source filing: View source filing
Reporting owner signature: /s/ W. Morgan Burns, Attorney-in-Fact

Key filing fact

Donald G. Krantz filed Form 4 for Proto Labs Inc (PRLB) on 21 May 2026.

Key facts

This page summarizes Donald G. Krantz's Form 4 filing for Proto Labs Inc (PRLB).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 21 May 2026, 16:04.

Change

Previous filing in this sequence was filed on 28 May 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001183159 Primary reporting owner

KRANTZ DONALD G

Relationship: Director
Address: 5540 PIONEER CREEK DRIVE, MAPLE PLAIN
Signature: /s/ W. Morgan Burns, Attorney-in-Fact
Signature date: 21 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PRLB transaction

Common Stock

Award

Transaction value
Shares: +2,210
Change %: +9%
Price: $0.000000^*
Shares after: 26,863
Date: 19 May 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

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.