Proto Labs Inc

PRLB · Fabricated Structural Metal Products · 23.8M shares · -1%/yr ↓ buyback · EDGAR filings ↗

Net buyback after stock comp: $28M (gross $44M, SBC $16M)

Reference price $76.91 · est. market cap ~$1.8B — last insider sale, 2026-06-02 (estimated from the dated SEC Form 4 price × shares outstanding — not a live quote)

Grade

C68

Differentiated digital-manufacturing leader with a clean balance sheet and solid cash flow but mid-pack returns.

Strengths

Strong liquidity (current ratio 3.5) and FCF of $59.7M (61st pct); 28% net-income growth (66th pct)
Proprietary tech/IP moat, 96% repeat revenue, serves 95% of the Fortune 100

Risks

Returns are unremarkable: ROE 3.2% (47th pct) and ROA 2.8% (70th pct) sit near the median
Margin/return profile has stayed modest despite the franchise's scale and reputation

Notable findings

Exec changeRecent 8-K item 5.02 8-K ↗
Customer concentration~96% of revenue from one customer/distributor — As a result of the factors described above, many of our customers tend to return to Proto Labs to meet their ongoing needs, 30 Table of Contents with approximately 96%, 95% and 95% of our reve
Strong balance sheetStrong balance sheet — $142M cash & investments
Insider sellingInsider selling — 10 open-market sale(s) by 2 insider(s) (cluster of 2 insiders, ~$2M, last 6mo) Form 4 ↗

Quarterly revenue

2017-03-31 · $80M2017-06-30 · $82M2017-09-30 · $88M2017-12-31 · $94M

Last 4 quarters · from SEC filings.

Key metrics

Return on equity

3.2%

Return on assets

2.8%

Revenue growth (QoQ)

6.9%

Net-income growth

28.0%

Current ratio

3.5×

Free cash flow

$60M

EBITDA

$59M

Tangible book value

$381M

Cash & investments

$142M

Insider transactions · last 18 months

Date	Insider	Type	Shares	Price
2026-06-02	WEHRWEIN SVEN	Sell	500	$78.38
2026-06-02	WEHRWEIN SVEN	Sell	1.5K	$76.91
2026-05-23	Krishna Suresh	Tax withheld	1.2K	$71.36
2026-05-20	Schumacher Daniel	Tax withheld	255	$71.13
2026-05-20	Parlange Bernardo	Grant	2.1K	—
2026-05-19	Black Archie C.	Grant	2.2K	—
2026-05-19	Chand Sujeet	Grant	2.2K	—
2026-05-19	Chin Moonhie	Grant	2.2K	—
2026-05-19	Gawlick Rainer	Grant	2.2K	—
2026-05-19	WEHRWEIN SVEN	Grant	2.2K	—
2026-05-19	KRANTZ DONALD G	Grant	2.2K	—
2026-05-12	Kenison Michael R.	Sell	1.6K	$67.58
2026-05-12	Kenison Michael R.	Option exercise	1.9K	$33.84
2026-05-12	Kenison Michael R.	Option exercise	1.6K	$39.61
2026-05-12	Kenison Michael R.	Option exercise	4.0K	$59.40
2026-05-12	Kenison Michael R.	Sell	4.2K	$68.70
2026-05-12	Kenison Michael R.	Sell	3.6K	$69.78
2026-05-12	Kenison Michael R.	Sell	6.6K	$70.30
2026-05-11	Kenison Michael R.	Sell	7.4K	$70.26
2026-05-11	Kenison Michael R.	Option exercise	3.8K	$33.84
2026-05-11	Kenison Michael R.	Option exercise	3.7K	$33.52
2026-05-07	Kenison Michael R.	Option exercise	100	$33.84
2026-05-07	Kenison Michael R.	Option exercise	100	$33.52
2026-05-07	Kenison Michael R.	Sell	200	$70.00
2026-02-25	Kenison Michael R.	Tax withheld	531	$62.63
2026-02-25	Krishna Suresh	Grant	13K	—
2026-02-25	Schumacher Daniel	Grant	3.1K	—
2026-02-25	Schumacher Daniel	Tax withheld	504	$62.63
2026-02-25	Kenison Michael R.	Grant	2.4K	—
2026-02-25	Kermisch Marc	Grant	2.8K	—
2026-02-17	Kenison Michael R.	Sell	5.0K	$66.46
2026-02-13	Kenison Michael R.	Tax withheld	1.5K	$67.52
2026-02-13	Schumacher Daniel	Tax withheld	1.3K	$67.52
2026-02-11	Schumacher Daniel	Option exercise	3.1K	$33.84
2026-02-10	Kenison Michael R.	Tax withheld	2.7K	$53.18
2026-02-10	Schumacher Daniel	Tax withheld	6.8K	$53.18
2026-02-06	Kenison Michael R.	Sell	2.5K	$60.00
2026-01-29	Kenison Michael R.	Grant	8.1K	—
2026-01-29	Schumacher Daniel	Grant	21K	—
2025-11-25	Kenison Michael R.	Option exercise	3.0K	$33.84
2025-11-25	Kenison Michael R.	Sell	3.0K	$50.17
2025-11-25	Kenison Michael R.	Option exercise	3.0K	$33.84
2025-11-25	Kenison Michael R.	Sell	3.0K	$50.17
2025-11-17	Kermisch Marc	Grant	3.7K	—
2025-08-05	Gawlick Rainer	Buy	1.7K	$43.79
2025-08-04	Krishna Suresh	Buy	1.7K	$43.51
2025-05-23	Black Archie C.	Grant	3.9K	—
2025-05-23	Gawlick Rainer	Grant	3.9K	—
2025-05-23	Chin Moonhie	Grant	3.9K	—
2025-05-23	Chand Sujeet	Grant	3.9K	—
2025-05-23	Greiner Stacy	Grant	3.9K	—
2025-05-23	WEHRWEIN SVEN	Grant	3.9K	—
2025-05-23	KRANTZ DONALD G	Grant	3.9K	—
2025-05-23	Krishna Suresh	Grant	16K	—
2025-05-20	Schumacher Daniel	Tax withheld	305	$40.87
2025-05-20	Kenison Michael R.	Tax withheld	204	$40.87
2025-02-25	Schumacher Daniel	Grant	4.4K	—
2025-02-25	Kenison Michael R.	Grant	6.9K	—
2025-02-25	Ryaboy Oleg	Grant	7.6K	—
2025-02-25	Bodor Robert	Grant	19K	—
2025-02-13	Bodor Robert	Grant	24K	—
2025-02-13	Bodor Robert	Tax withheld	7.5K	$45.03
2025-02-13	Bodor Robert	Tax withheld	7.3K	$45.03
2025-02-13	Kenison Michael R.	Grant	1.9K	—
2025-02-13	Kenison Michael R.	Tax withheld	580	$45.03
2025-02-13	Kenison Michael R.	Tax withheld	1.7K	$45.03
2025-02-13	Schumacher Daniel	Grant	3.1K	—
2025-02-13	Schumacher Daniel	Tax withheld	1.1K	$45.03
2025-02-13	Schumacher Daniel	Tax withheld	1.3K	$45.03
2025-02-13	Ryaboy Oleg	Tax withheld	2.5K	$45.03

All non-derivative Form 4 activity (SEC), newest first.

Notable events (8-K)

Date	Items
2026-05-20	Exec/director changeShareholder voteExhibits	filing ↗
2026-05-07	Exec/director changeReg FDExhibits	filing ↗
2026-05-01	ResultsExhibits	filing ↗
2026-02-06	ResultsExhibits	filing ↗
2026-02-06	ResultsExhibits	filing ↗
2025-10-31	ResultsExhibits	filing ↗
2025-10-03	Exec/director changeReg FDExhibits	filing ↗
2025-07-31	ResultsExhibits	filing ↗

Recent filings

Form	Filed	Period	Accession
8-K	2026-05-20	2026-05-19	0001443669-26-000028 ↗
8-K	2026-05-07	2026-05-06	0001104659-26-056700 ↗
10-Q	2026-05-01	2026-03-31	0001443669-26-000025 ↗
8-K	2026-05-01	2026-05-01	0001443669-26-000023 ↗
10-K	2026-02-20	2025-12-31	0001443669-26-000010 ↗
8-K	2026-02-06	2026-02-06	0001443669-26-000003 ↗
8-K/A	2026-02-06	2026-02-06	0001443669-26-000006 ↗
10-Q	2025-10-31	2025-09-30	0001443669-25-000013 ↗
8-K	2025-10-31	2025-10-31	0001443669-25-000011 ↗
8-K	2025-10-03	2025-10-03	0001104659-25-096447 ↗
8-K	2025-07-31	2025-07-31	0001628280-25-036811 ↗
10-Q	2025-07-31	2025-06-30	0001628280-25-037024 ↗