Proto Labs officer plans $408K stock sale

Rhea-AI Filing Summary

Proto Labs, Inc. (PRLB) officer Daniel Schumacher filed a Rule 144 notice to sell up to 4,900 shares of Proto Labs common stock through Morgan Stanley Smith Barney LLC on the NYSE, with an indicated aggregate market value of $407,876.00 as of September 17, 2026.

The shares were acquired upon vesting of restricted stock units granted on May 20, 2020 and vesting through February 13, 2025, and the notice reports prior 10b5-1 plan sales of 100 shares for $8,500.00 on September 16, 2026.

Key Figures

Shares planned for sale: 4,900 shares Aggregate market value of planned sale: $407,876.00 Shares sold in past 3 months: 100 shares +4 more

7 metrics

Shares planned for sale 4,900 shares Common stock covered by Daniel Schumacher's Rule 144 notice

Aggregate market value of planned sale $407,876.00 Indicated value for the 4,900 shares as of September 17, 2026

Shares sold in past 3 months 100 shares 10b5-1 sale on September 16, 2026 reported in the notice

Value of past 3-month sale $8,500.00 Proceeds from 100-share sale on September 16, 2026

Notice date September 17, 2026 Date of Rule 144 notice filed for Proto Labs common stock

RSU grant date May 20, 2020 Original grant date of restricted stock units that vested into these shares

RSU vesting period end February 13, 2025 End of vesting period for RSUs that produced the shares to be sold

Key Terms

Rule 144, restricted stock units, 10b5-1

3 terms

Rule 144 regulatory

"See the definition of "person" in 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.

restricted stock units financial

"The securities to be sold were acquired upon the vesting of restricted stock units"

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.

10b5-1 regulatory

"10b5-1 Sales for DANIEL SCHUMACHER 5540 Pioneer Creek Drive"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

FAQ

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

What does Proto Labs (PRLB) disclose in Daniel Schumacher's Form 144 filing?

The filing states that officer Daniel Schumacher intends to sell up to 4,900 shares of Proto Labs common stock under Rule 144, with an indicated aggregate market value of $407,876.00, through Morgan Stanley Smith Barney LLC on the NYSE.

How many Proto Labs (PRLB) shares are covered by this Rule 144 notice?

The Rule 144 notice covers up to 4,900 shares of Proto Labs common stock. These shares are planned to be sold through Morgan Stanley Smith Barney LLC, with the notice indicating an aggregate market value of $407,876.00 as of September 17, 2026.

What prior sales does the Form 144 report for Proto Labs (PRLB) officer Daniel Schumacher?

The notice reports that under a 10b5-1 plan, Daniel Schumacher sold 100 shares of Proto Labs common stock on September 16, 2026 for a total of $8,500.00 during the three months preceding the notice.

How were the Proto Labs (PRLB) shares in this Form 144 acquired?

The filing explains that the securities to be sold were acquired upon the vesting of restricted stock units during the period from May 20, 2020 through February 13, 2025, relating to Proto Labs common stock.

Who is the broker handling the planned Proto Labs (PRLB) stock sale under this Form 144?

The Form 144 lists Morgan Stanley Smith Barney LLC Executive Financial Services, at One New York Plaza, as the broker handling the planned sale of the 4,900 shares of Proto Labs common stock on the NYSE.

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

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Available on EDGAR 09/17/2026 - 04:28 PM Accepted by SEC EDGAR 09/17/2026 - 04:28 PM Learn about SEC filing dates

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	0001894753
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	7634793680
Name of Person for Whose Account the Securities are To Be Sold	DANIEL SCHUMACHER
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	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	4900	407876.00	23921897	09/17/2026	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	05/20/2020	Restricted Stock Units	Issuer			4900	05/20/2020	N/A

* 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
10b5-1 Sales for DANIEL SCHUMACHER 5540 Pioneer Creek Drive Maple Plain MN 55359	Common	09/16/2026	100	8500.00

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 5/20/2020 through 2/13/2025
Date of Notice	09/17/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/05/2026
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/ Daniel Schumacher
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)