Key facts
- This page summarizes Michael R. Kenison's Form 4 filing for Proto Labs Inc (PRLB).
- 15 reported transactions and 5 derivative rows are listed below.
- Accepted by SEC: 13 May 2026, 16:40.
Michael R. Kenison - 11 May 2026 Form 4 Insider Report for Proto Labs Inc (PRLB)
- Reporting relationship
- Chief Operations Officer
- Issuer ticker
- PRLB
- Reported as of
- 11 May 2026
- Net transaction value
- -$1,636,166
- SEC form
- 4
- Accepted by SEC
- 13 May 2026, 16:40:37 UTC
- Prior SEC filing
- 08 May 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ W. Morgan Burns, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Michael R. Kenison filed Form 4 for Proto Labs Inc (PRLB) on 13 May 2026.
Change
- Previous filing in this sequence was filed on 08 May 2026.
- Current net transaction value: -$1,636,166.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001870293
Primary reporting owner
Kenison Michael R.
- Relationship
- Chief Operations Officer
- Address
- 5540 PIONEER CREEK DRIVE, MAPLE PLAIN
- Signature
- /s/ W. Morgan Burns, Attorney-in-Fact
- Signature date
- 13 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
PRLB
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +3,756
- Change %
- +14%
- Price
- $33.84*
- Shares after
- 30,942
- Date
- 11 May 2026
- Ownership
- Direct
- Footnotes
- F1
PRLB
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +3,677
- Change %
- +12%
- Price
- $33.52*
- Shares after
- 34,619
- Date
- 11 May 2026
- Ownership
- Direct
- Footnotes
- F1
PRLB
transaction
Common Stock
Sale
- Transaction value
- $522,251
- Shares
- -7,433
- Change %
- -21%
- Price
- $70.26
- Shares after
- 27,186
- Date
- 11 May 2026
- Ownership
- Direct
- Footnotes
- F1, F2
PRLB
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +1,928
- Change %
- +7.1%
- Price
- $33.84*
- Shares after
- 29,114
- Date
- 12 May 2026
- Ownership
- Direct
PRLB
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +1,557
- Change %
- +5.3%
- Price
- $39.61*
- Shares after
- 30,671
- Date
- 12 May 2026
- Ownership
- Direct
PRLB
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +4,042
- Change %
- +13%
- Price
- $59.40*
- Shares after
- 34,713
- Date
- 12 May 2026
- Ownership
- Direct
PRLB
transaction
Common Stock
Sale
- Transaction value
- $109,008
- Shares
- -1,613
- Change %
- -4.6%
- Price
- $67.58
- Shares after
- 33,100
- Date
- 12 May 2026
- Ownership
- Direct
- Footnotes
- F3
PRLB
transaction
Common Stock
Sale
- Transaction value
- $288,390
- Shares
- -4,198
- Change %
- -13%
- Price
- $68.70
- Shares after
- 28,902
- Date
- 12 May 2026
- Ownership
- Direct
- Footnotes
- F4
PRLB
transaction
Common Stock
Sale
- Transaction value
- $249,542
- Shares
- -3,576
- Change %
- -12%
- Price
- $69.78
- Shares after
- 25,326
- Date
- 12 May 2026
- Ownership
- Direct
- Footnotes
- F5
PRLB
transaction
Common Stock
Sale
- Transaction value
- $466,975
- Shares
- -6,643
- Change %
- -26%
- Price
- $70.30
- Shares after
- 18,683
- Date
- 12 May 2026
- Ownership
- Direct
- Footnotes
- F6
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
PRLB
transaction
Derivative
Employee Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -3,756
- Change %
- -49%
- Price
- $0.000000*
- Shares after
- 3,856
- Date
- 11 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 3,756
- Exercise price
- $33.84
- Footnotes
- F1, F7
PRLB
transaction
Derivative
Employee Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -3,677
- Change %
- -49%
- Price
- $0.000000*
- Shares after
- 3,778
- Date
- 11 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 3,677
- Exercise price
- $33.52
- Footnotes
- F1, F8
PRLB
transaction
Derivative
Employee Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -1,928
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 1,928
- Date
- 12 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 1,928
- Exercise price
- $33.84
- Footnotes
- F7
PRLB
transaction
Derivative
Employee Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -1,557
- Change %
- -25%
- Price
- $0.000000*
- Shares after
- 4,674
- Date
- 12 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 1,557
- Exercise price
- $39.61
- Footnotes
- F9
PRLB
transaction
Derivative
Employee Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -4,042
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 12 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 4,042
- Exercise price
- $59.40
- Footnotes
- F10
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 10 footnotes
Footnote F1
These shares were acquired and sold pursuant to Reporting Person's 10b5-1 plan adopted August 15, 2025.
Footnote F2
Reflects the weighted average price of 7,433 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 11, 2026, with sale prices ranging from $70.00 to $70.57 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.
Footnote F3
Reflects the weighted average price of 1,613 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $67.06 to $68.05 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.
Footnote F4
Reflects the weighted average price of 4,198 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $68.10 to $69.0425 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.
Footnote F5
Reflects the weighted average price of 3,576 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $69.13 to $70.1181 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.
Footnote F6
Reflects the weighted average price of 6,643 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $70.13 to $70.57 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.
Footnote F7
25% of shares subject to the award will vest on February 13, 2024, and on each February 13th thereafter until all shares subject to the award are fully vested.
Footnote F8
25% of shares subject to the award will vest on February 13, 2025, and on each February 13th thereafter until all shares subject to the award are fully vested.
Footnote F9
25% of shares subject to the award will vest on February 25, 2026, and on each February 25th thereafter until all shares subject to the award are fully vested.
Footnote F10
25% of shares subject to the award will vest on February 13, 2023, and on each February 13th thereafter until all shares subject to the award are fully vested.