Proto Labs CFO Daniel Schumacher sells 5,000 shares

The CFO’s reported sale was executed under a Rule 10b5-1 trading plan adopted on June 5, 2026.

Rhea-AI Filing Summary

Proto Labs Inc (PRLB) Chief Financial Officer Daniel Schumacher sold 5,000 shares of common stock on September 24, 2026, at a weighted average price of $95.3209 per share across multiple transactions; sale prices ranged from $95.00 to $95.65. The sale was executed under a Rule 10b5-1 trading plan adopted on June 5, 2026. He directly held 35,019 shares after the sale.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares

Net Sell 1 txn

Insider Schumacher Daniel

Role Chief Financial Officer

Sold 5,000 shs ($477K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	5,000	$95.3209	$477K

Holdings After Transaction: Common Stock — 35,019 shares (Direct)

Footnotes (2)

1. F1. This transaction was executed pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 5, 2026.
2. F2. Reflects the weighted average price of 5,000 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on September 24, 2026, with sale prices ranging from $95.00 to $95.65 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Key Figures

Common shares sold: 5,000 shares Weighted average sale price: $95.3209 per share Sale price range: $95.00 to $95.65 per share +2 more

5 metrics

Common shares sold 5,000 shares September 24, 2026

Weighted average sale price $95.3209 per share September 24, 2026

Sale price range $95.00 to $95.65 per share September 24, 2026

Direct shares held after sale 35,019 shares After the September 24, 2026 sale

Trading plan adoption date June 5, 2026 Rule 10b5-1 trading plan

Key Terms

Rule 10b5-1 trading plan, weighted average price

2 terms

Rule 10b5-1 trading plan regulatory

"pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"Reflects the weighted average price of 5,000 shares"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

FAQ

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

How many PRLB shares did CFO Daniel Schumacher sell, and at what price?

Daniel Schumacher sold 5,000 shares of Proto Labs common stock on September 24, 2026, at a weighted average price of $95.3209 per share. Sale prices ranged from $95.00 to $95.65 per share.

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

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Available on EDGAR 09/25/2026 - 04:24 PM Accepted by SEC EDGAR 09/25/2026 - 04:11 PM Learn about SEC filing dates

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).

X

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^*

Schumacher Daniel

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/24/2026

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	09/24/2026		S(1)		5,000	D	$95.3209(2)	35,019	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. This transaction was executed pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 5, 2026.

2. Reflects the weighted average price of 5,000 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on September 24, 2026, with sale prices ranging from $95.00 to $95.65 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Remarks:

	/s/ W. Morgan Burns, Attorney-in-Fact	09/25/2026
	** 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)