PRLB SEC Filing News — Proto Labs, Inc.

Latest SEC filings for Proto Labs, Inc. (PRLB) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-25.

Proto Labs, Inc., together with its subsidiaries, operates as a digital manufacturer of custom parts in the United States and Europe. It offers manufacturing services, such as molding, computer numerical control machining, 3D printing, and sheet metal to developers, engineers, and supply chain teams. The company was incorporated in 1999 and is headquartered in Maple Plain, Minnesota.
Sector: Industrials Industry: Metal Fabrication Market Cap: $2.1B CIK: 1443669
20
Total Filings
0
Bullish Classifications
5
Bearish Classifications
7
Insider Transactions
3
Material Events (8-K)
1
Periodic Reports
Rule-based classifications for PRLB currently lean bearish. Of the 20 filing records displayed, 5 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
PRLB Filing Activity Snapshot 2026-05-08 — 2026-09-25
Insider Transactions (Form 4)
0 buys vs 5 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$1.64M
Kenison Michael R. (Chief Operations Officer) · 2026-05-13
23,463 shares · Form 4
Form 144 Notices
9
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 7 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 7 filings in this group are Form 4s for Proto Labs, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 7 insider filings shown, the breakdown is 5 open-market sale and 2 compensation award. 5 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×5
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Compensation award ×2
Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Form 4 Open-market sale Insider Selling 2026-09-25

PRLB insider Schumacher Daniel (Chief Financial Officer) sold 5,000 shares (~$476.6K)

Schumacher Daniel, listed as Chief Financial Officer at Proto Labs Inc, reported an open-market sale of 5,000 PRLB shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 5,000 $95.32 $476.6K
Filing: Form 4 (Insider Transaction) Insider: Schumacher Daniel (Chief Financial Officer) Shares: 5,000 Est. Value: $476.6K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-18

PRLB insider Schumacher Daniel (Chief Financial Officer) sold 5,000 shares (~$426.0K)

Schumacher Daniel, listed as Chief Financial Officer at Proto Labs Inc, reported an open-market sale of 5,000 PRLB shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 100 $85.00 $8.5K
S Open-market sale 4,900 $85.21 $417.5K
Filing: Form 4 (Insider Transaction) Insider: Schumacher Daniel (Chief Financial Officer) Shares: 5,000 Est. Value: $426.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-06-04

PRLB insider WEHRWEIN SVEN (Director) sold 2,000 shares (~$154.6K)

WEHRWEIN SVEN, listed as Director at Proto Labs Inc, reported an open-market sale of 2,000 PRLB shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,500 $76.91 $115.4K
S Open-market sale 500 $78.38 $39.2K
Filing: Form 4 (Insider Transaction) Insider: WEHRWEIN SVEN (Director) Shares: 2,000 Est. Value: $154.6K
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-05-21

PRLB insider Form 4 filed for equity award, exercise, or tax withholding

WEHRWEIN SVEN (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 2,210 — —
Filing: Form 4 (Insider Transaction) Insider: WEHRWEIN SVEN (Director) Shares: 2,210
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-05-21

PRLB insider Form 4 filed for equity award, exercise, or tax withholding

KRANTZ DONALD G (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 2,210 — —
Filing: Form 4 (Insider Transaction) Insider: KRANTZ DONALD G (Director) Shares: 2,210
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-13

PRLB insider Kenison Michael R. (Chief Operations Officer) sold 23,463 shares (~$1.64M)

Kenison Michael R., listed as Chief Operations Officer at Proto Labs Inc, reported an open-market sale of 23,463 PRLB shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 3,756 $33.84 $127.1K
M Option exercise 3,677 $33.52 $123.3K
S Open-market sale 7,433 $70.26 $522.3K
M Option exercise 1,928 $33.84 $65.2K
M Option exercise 1,557 $39.61 $61.7K
M Option exercise 4,042 $59.40 $240.1K
S Open-market sale 1,613 $67.58 $109.0K
S Open-market sale 4,198 $68.70 $288.4K
S Open-market sale 3,576 $69.78 $249.5K
S Open-market sale 6,643 $70.30 $467.0K
M Option exercise derivative · Employee Stock Option (right to buy) 3,756 — —
M Option exercise derivative · Employee Stock Option (right to buy) 3,677 — —
M Option exercise derivative · Employee Stock Option (right to buy) 1,928 — —
M Option exercise derivative · Employee Stock Option (right to buy) 1,557 — —
M Option exercise derivative · Employee Stock Option (right to buy) 4,042 — —
Filing: Form 4 (Insider Transaction) Insider: Kenison Michael R. (Chief Operations Officer) Shares: 23,463 Est. Value: $1.64M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-08

PRLB insider Kenison Michael R. (Chief Operations Officer) sold 200 shares (~$14.0K)

Kenison Michael R., listed as Chief Operations Officer at Proto Labs Inc, reported an open-market sale of 200 PRLB shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 100 $33.84 $3.4K
M Option exercise 100 $33.52 $3.4K
S Open-market sale 200 $70.00 $14.0K
M Option exercise derivative · Employee Stock Option (right to buy) 100 — —
M Option exercise derivative · Employee Stock Option (right to buy) 100 — —
Filing: Form 4 (Insider Transaction) Insider: Kenison Michael R. (Chief Operations Officer) Shares: 200 Est. Value: $14.0K
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 9 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Proto Labs, Inc. has 9 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-09-25

PRLB Form 144 filed for proposed insider sale by MICHAEL R KENISON (1,143 shares) ~$109.5K

MICHAEL R KENISON filed a Form 144 with the SEC indicating intent to sell PRLB (Proto Labs Inc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MICHAEL R KENISON Shares: 1,143 Est. Value: $109.5K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-24

PRLB Form 144 filed for proposed insider sale by DANIEL SCHUMACHER (5,000 shares) ~$445.6K

DANIEL SCHUMACHER filed a Form 144 with the SEC indicating intent to sell PRLB (Proto Labs Inc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DANIEL SCHUMACHER Shares: 5,000 Est. Value: $445.6K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-24

PRLB Form 144 filed for proposed insider sale by MICHAEL R KENISON (1,800 shares) ~$172.5K

MICHAEL R KENISON filed a Form 144 with the SEC indicating intent to sell PRLB (Proto Labs Inc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MICHAEL R KENISON Shares: 1,800 Est. Value: $172.5K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-17

PRLB Form 144 filed for proposed insider sale by DANIEL SCHUMACHER (4,900 shares) ~$407.9K

DANIEL SCHUMACHER filed a Form 144 with the SEC indicating intent to sell PRLB (Proto Labs Inc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DANIEL SCHUMACHER Shares: 4,900 Est. Value: $407.9K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-16

PRLB Form 144 filed for proposed insider sale

An insider at Proto Labs Inc filed a Form 144 notifying the SEC of an intent to sell shares. Form 144 is a proposed sale notice rather than confirmation that a sale already happened.

Filing: Form 144 (Proposed Sale Notice)
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-04

PRLB Form 144 filed for proposed insider sale

An insider at Proto Labs Inc filed a Form 144 notifying the SEC of an intent to sell shares. Form 144 is a proposed sale notice rather than confirmation that a sale already happened.

Filing: Form 144 (Proposed Sale Notice)
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-06-01

PRLB Form 144 filed for proposed insider sale

An insider at Proto Labs Inc filed a Form 144 notifying the SEC of an intent to sell shares. Form 144 is a proposed sale notice rather than confirmation that a sale already happened.

Filing: Form 144 (Proposed Sale Notice)
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-05-12

PRLB Form 144 filed for proposed insider sale by MICHAEL R KENISON (16,030 shares) ~$1.11M

MICHAEL R KENISON filed a Form 144 with the SEC indicating intent to sell PRLB (Proto Labs Inc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MICHAEL R KENISON Shares: 16,030 Est. Value: $1.11M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-05-11

PRLB Form 144 filed for proposed insider sale by MICHAEL KENISON (7,433 shares) ~$515.1K

MICHAEL KENISON filed a Form 144 with the SEC indicating intent to sell PRLB (Proto Labs Inc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MICHAEL KENISON Shares: 7,433 Est. Value: $515.1K
View on SEC EDGAR → Open Filing Document →
Material Events 3 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 3 in this period for Proto Labs, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-24

PRLB filed 8-K — material company event

Proto Labs Inc filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-07-31

PRLB filed 8-K — material company event

Proto Labs Inc filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-05-20

PRLB filed 8-K — material company event

Proto Labs Inc filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for Proto Labs, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-07-31

PRLB filed Quarterly Report (10-Q)

Proto Labs Inc filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify Proto Labs, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on PRLB. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — PRLB SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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