[Form 4] Proto Labs Inc Insider Trading Activity

Rhea-AI Filing Summary

Proto Labs Inc Chief Financial Officer Daniel Schumacher reported a routine tax-related share disposition. On May 20, 2026, 255 shares of Common Stock were withheld at $71.13 per share to cover tax obligations, leaving him with 45,019 directly held shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Schumacher Daniel

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	255	$71.13	$18K

Holdings After Transaction: Common Stock — 45,019 shares (Direct, null)

Footnotes (1)

Key Figures

Shares withheld for taxes: 255 shares Tax-withholding price: $71.13 per share Shares held after transaction: 45,019 shares

3 metrics

Shares withheld for taxes 255 shares Tax-withholding disposition on May 20, 2026

Tax-withholding price $71.13 per share Value used for 255-share disposition

Shares held after transaction 45,019 shares Directly owned Proto Labs common stock post-transaction

Key Terms

tax-withholding disposition, Form 4, Common Stock

3 terms

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

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).

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)
05/20/2026

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	05/20/2026		F		255	D	$71.13	45,019	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:

Remarks:

	/s/ W. Morgan Burns, Attorney-in-Fact	05/22/2026
	** 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)

FAQ

What insider transaction did Proto Labs (PRLB) report for Daniel Schumacher?

Proto Labs reported a tax-withholding share disposition for Daniel Schumacher. On May 20, 2026, 255 shares of common stock were withheld to satisfy tax obligations linked to equity compensation, rather than sold in the open market.

How many Proto Labs (PRLB) shares were involved in Daniel Schumacher’s Form 4 filing?

The filing shows 255 Proto Labs common shares were disposed of. These shares were withheld by the company to cover tax liabilities, classified as a tax-withholding disposition, and do not represent an open-market sale by the Chief Financial Officer.

At what price were Daniel Schumacher’s Proto Labs (PRLB) shares withheld for taxes?

The shares were withheld at a price of $71.13 per share. This figure reflects the value used for the tax-withholding disposition of 255 common shares as reported in the Form 4 insider transaction.

How many Proto Labs (PRLB) shares does Daniel Schumacher hold after this transaction?

After the tax-withholding transaction, Daniel Schumacher holds 45,019 shares. The Form 4 states this total as his directly owned Proto Labs common stock position following the 255-share tax-withholding disposition.

Was Daniel Schumacher’s Proto Labs (PRLB) Form 4 an open-market sale?

No, the transaction was not an open-market sale. The Form 4 classifies it with code F as a tax-withholding disposition, meaning shares were delivered to cover tax liabilities rather than being sold on the market.

What does transaction code F mean in the Proto Labs (PRLB) Form 4?

Transaction code F indicates a tax-withholding disposition. It means shares were used to pay the exercise price or related tax liability on equity awards, and is not considered a discretionary open-market buy or sell transaction.