Proto Labs CFO sells 5,000 shares at ~$85

Proto Labs Inc (PRLB) reported that Chief Financial Officer Daniel Schumacher sold a total of 5,000 shares of common stock in open-market transactions on September 16–17, 2026 under a Rule 10b5-1 trading plan.

Available on EDGAR 09/18/2026 - 04:03 PM EDT Accepted by SEC EDGAR 09/18/2026 - 04:02 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Proto Labs Inc (PRLB) reported that Chief Financial Officer Daniel Schumacher sold a total of 5,000 shares of common stock in open-market transactions on September 16–17, 2026 under a Rule 10b5-1 trading plan. The September 17 sale of 4,900 shares used a weighted-average price with trades between $85.00 and $85.50 per share.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares

Net Sell 2 txns

Insider Schumacher Daniel

Role Chief Financial Officer

Sold 5,000 shs ($426K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	4,900	$85.2113	$418K
Sale	Common Stock F1	100	$85.00	$9K

Holdings After Transaction: Common Stock — 40,019 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 4,900 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on September 17, 2026, with sale prices ranging from $85.00 to $85.50 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

Total shares sold: 5,000 shares Shares sold on September 16, 2026: 100 shares Price on September 16, 2026: $85.00 per share +3 more

6 metrics

Total shares sold 5,000 shares Common stock sales reported for September 16–17, 2026

Shares sold on September 16, 2026 100 shares Open‑market sale of common stock

Price on September 16, 2026 $85.00 per share Sale of 100 common shares

Shares sold on September 17, 2026 4,900 shares Open‑market sale of common stock in multiple trades

Weighted‑average price September 17, 2026 $85.2113 per share Sale of 4,900 common shares; individual prices $85.00–$85.50

Rule 10b5‑1 plan adoption date June 5, 2026 Plan governing the reported sales

Key Terms

Rule 10b5 1 trading plan, weighted average price, open market or private transaction

3 terms

Rule 10b5 1 trading plan regulatory

"This transaction was executed pursuant to a Rule 10b5 1 trading plan"

weighted average price financial

"Reflects the weighted average price of 4,900 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.

open market or private transaction market

"Sale in open market or private transaction"

FAQ

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

What insider transactions did Proto Labs (PRLB) disclose in this Form 4?

Proto Labs disclosed that its Chief Financial Officer Daniel Schumacher sold 5,000 shares of common stock in two open‑market transactions on September 16–17, 2026.

At what prices did the Proto Labs (PRLB) CFO sell shares?

On September 16, 2026, 100 shares were sold at $85.00 per share. On September 17, 2026, 4,900 shares were sold at a weighted‑average price of $85.2113, with individual trades ranging from $85.00 to $85.50 per share.

Were the PRLB insider sales made under a Rule 10b5-1 trading plan?

Yes. The filing states the sales were executed pursuant to a Rule 10b5‑1 trading plan adopted by Daniel Schumacher on June 5, 2026, and the Rule 10b5‑1 checkbox is affirmed.

How many Proto Labs (PRLB) shares did the CFO sell in total?

Daniel Schumacher sold a total of 5,000 shares of Proto Labs common stock, consisting of 100 shares on September 16, 2026 and 4,900 shares on September 17, 2026.

Does the Form 4 disclose Daniel Schumacher’s remaining PRLB holdings?

No. For these transactions, the Form 4 does not report a total shares following transaction figure, so Schumacher’s remaining Proto Labs holdings are not detailed in this filing.

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

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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)
09/16/2026

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	09/16/2026		S(1)		100	D	$85	44,919	D
Common Stock	09/17/2026		S(1)		4,900	D	$85.2113(2)	40,019	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 4,900 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on September 17, 2026, with sale prices ranging from $85.00 to $85.50 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	09/18/2026
	** 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)