Proto Labs former officer proposes sale of 1,800 shares

The notice also lists 10,753 common shares sold on August 4, 2026, for $947,786.62 during the preceding three months.

Available on EDGAR 09/24/2026 - 04:17 PM EDT Accepted by SEC EDGAR 09/24/2026 - 04:17 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Proto Labs, Inc. (PRLB) former officer Michael Roy Kenison reported a proposed sale of 1,800 common shares, with an approximate sale date of September 24, 2026, and an aggregate market value of $172,534.50. The shares are listed as acquired from the issuer on that date through exercise of options under a registered plan, with cash payment; Morgan Stanley Smith Barney LLC is named as broker. The notice also reports that Kenison sold 10,753 common shares on August 4, 2026, for $947,786.62 during the preceding three months.

Key Figures

Proposed sale: 1,800 common shares Aggregate market value: $172,534.50 Shares acquired through option exercise: 1,800 common shares +2 more

5 metrics

Proposed sale 1,800 common shares Approximate sale date: September 24, 2026

Aggregate market value $172,534.50 For the proposed sale of 1,800 common shares

Shares acquired through option exercise 1,800 common shares September 24, 2026; acquired from the issuer under a registered plan

Shares sold during preceding three months 10,753 common shares Sold August 4, 2026

Gross proceeds from past sale $947,786.62 Associated with 10,753 common shares sold August 4, 2026

Key Terms

Rule 144, Exercise of Options Under a Registered Plan

2 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Exercise of Options Under a Registered Plan financial

"Exercise of Options Under a Registered Plan"

FAQ

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

How many PRLB shares is former officer Michael Roy Kenison proposing to sell?

Michael Roy Kenison reported a proposed sale of 1,800 common shares, with an approximate sale date of September 24, 2026. The listed aggregate market value is $172,534.50.

How many PRLB shares did Michael Roy Kenison sell in the preceding three months?

The notice lists 10,753 common shares sold on August 4, 2026, for $947,786.62 during the preceding three months.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001870293
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	PROTO LABS, INC.
SEC File Number	001-35435
Address of Issuer	5540 Pioneer Creek Drive Maple Plain MINNESOTA 55359
Phone	763-479-3680
Name of Person for Whose Account the Securities are To Be Sold	MICHAEL R KENISON
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Former Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	1800	172534.50	23922000	09/24/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/24/2026	Exercise of Options Under a Registered Plan	Issuer			1800	09/24/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
MICHAEL R KENISON 5540 Pioneer Creek Drive Maple Plain MN 55359	Common	08/04/2026	10753	947786.62

144: Remarks and Signature

Remarks
Date of Notice	09/24/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Michael Roy Kenison
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)