Proto Labs (PRLB) director reports open-market sale of 2,000 shares

Filing Impact

(Moderate)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Proto Labs Inc director Sven Wehrwein reported selling a total of 2,000 shares of common stock in open-market transactions on June 2, 2026. The shares were sold in two blocks: 500 shares at $78.38 per share and 1,500 shares at a weighted average price of $76.9067 per share. He continues to hold more than 32,000 shares directly after these sales, indicating this was a relatively small portion of his overall reported holdings.

Insider Trade Summary

Net Seller: 2,000 shares ($154,550)

Net Sell 2 txns

Insider WEHRWEIN SVEN

Role null

Sold 2,000 shs ($155K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,500	$76.9067	$115K
Sale	Common Stock	500	$78.38	$39K

Holdings After Transaction: Common Stock — 33,005 shares (Direct, null)

Footnotes (1)

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Key Figures

Total shares sold: 2,000 shares Sale price (first block): $78.38 per share Weighted average sale price: $76.9067 per share +1 more

4 metrics

Total shares sold 2,000 shares Open-market sales on June 2, 2026 by director Sven Wehrwein

Sale price (first block) $78.38 per share 500-share open-market sale of Proto Labs common stock

Weighted average sale price $76.9067 per share 1,500-share sale executed in multiple trades on June 2, 2026

Net shares sold 2,000 shares transactionSummary netBuySellShares, net-sell direction

Key Terms

open-market sale, weighted average price, multiple transactions, Form 4

4 terms

open-market sale financial

"transaction_action: "open-market sale" and transaction_code_description"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average price financial

"Reflects the weighted average price of 1,500 shares of common stock"

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.

multiple transactions financial

"sold by the reporting person in multiple transactions on June 2, 2026"

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/04/2026 - 04:54 PM Accepted by SEC EDGAR 06/04/2026 - 04:53 PM

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^*

WEHRWEIN SVEN

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/02/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/02/2026		S		1,500	D	$76.9067⁽¹⁾	33,005	D
Common Stock	06/02/2026		S		500	D	$78.38	32,505	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Reflects the weighted average price of 1,500 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on June 2, 2026, with sale prices ranging from $76.86 to $77.00 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	06/04/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Proto Labs (PRLB) disclose for Sven Wehrwein?

Proto Labs reported that director Sven Wehrwein sold 2,000 common shares. The Form 4 shows two open-market sales on June 2, 2026, totaling 2,000 shares, while he retained a direct holding of more than 32,000 shares afterward.

At what prices did Sven Wehrwein sell Proto Labs (PRLB) shares?

Wehrwein sold 500 shares at $78.38 and 1,500 shares around $76.91. The larger block used a weighted average price of $76.9067 per share, based on multiple trades between $76.86 and $77.00 on June 2, 2026.

How many Proto Labs (PRLB) shares does Sven Wehrwein hold after the reported sale?

The Form 4 indicates Sven Wehrwein continues to hold over 32,000 shares directly. Post-transaction share balances on the reported lines are in the low 30,000s, showing the 2,000 shares sold were a modest portion of his disclosed holdings.

What type of transaction did Sven Wehrwein execute in Proto Labs (PRLB) stock?

The filing describes both transactions as open-market sales of common stock. They are coded “S” on Form 4, meaning sales in the open market or private transactions, rather than option exercises, gifts, or tax-related withholdings.

Does the Proto Labs (PRLB) Form 4 mention multiple trades for the weighted average price?

Yes, the footnote explains the $76.9067 price is a weighted average. It states 1,500 shares were sold in multiple trades between $76.86 and $77.00 and offers to provide detailed trade-by-trade pricing information upon request.