Michael R. Kenison - 25 Nov 2025 Form 4/A - Amendment Insider Report for Proto Labs Inc (PRLB)

Role
Chief Operations Officer
Signature
/s/ Kareem S. Tawfic, Attorney-in-Fact
Issuer symbol
PRLB
Transactions as of
25 Nov 2025
Net transactions value
-$49,786
Form type
4/A - Amendment
Filing time
03 Dec 2025, 18:13:52 UTC
Date Of Original Report
26 Nov 2025
Previous filing
22 May 2025
Next filing
04 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Kenison Michael R. Chief Operations Officer 5540 PIONEER CREEK DRIVE, MAPLE PLAIN /s/ Kareem S. Tawfic, Attorney-in-Fact 03 Dec 2025 0001870293

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction PRLB Common Stock Options Exercise $103,144 +3,048 +11% $33.84 31,946 25 Nov 2025 Direct F1
transaction PRLB Common Stock Sale $152,931 -3,048 -9.5% $50.17 28,898 25 Nov 2025 Direct F2, F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction PRLB Employee Stock Option (right to buy) Options Exercise $0 -3,048 -100% $0.000000 0 25 Nov 2025 Common Stock 3,048 $33.84 Direct F4, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 Includes 57 shares of Common Stock of the issuer purchased on November 15, 2025 through the issuer's Employee Stock Purchase Plan program.
F2 These shares were acquired and sold pursuant to Reporting Person's 10b5-1 plan adopted August 15, 2025.
F3 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.
F4 Fully vested.
F5 This amendment reflects an adjustment to the expiration date of the Employee Stock Options to correct a clerical error in the reporting person's Form 4 filed on November 25, 2025. All transaction details were accurately reported on the original Form 4.