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Livermore
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Proto Labs Inc

PRLB
Exchange
NYSE
Industry
Fabricated Structural Metal Products
SEC CIK
0001443669

In the last 90 days, Proto Labs Inc insiders filed 0 open-market purchases and 2 sales; 277 institutions reported holding it in 13F filings for Q2 2026, worth $1.83B in total; ARK Invest is the only superinvestor holding it.

Holders of 5% or more of PRLB

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Proto Labs Inc, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of PRLB
HolderLatest formStakeChangeFirst filedLatest filingFiling
BlackRock, Inc.13G/A15.00%3.55M shares–Oct 18, 20243 filingsJul 17, 2025SEC
Disciplined Growth Investors Inc13G/A10.00%2.38M shares−0.50 ppfrom 10.50%Feb 15, 202211 filingsAug 14, 2026SEC
Vanguard Portfolio Management LLC13G6.51%1.55M sharesNewApr 29, 20261 filingApr 29, 2026SEC
Vanguard Capital Management LLC13G5.10%1.21M sharesNewApr 30, 20261 filingApr 30, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

43 Schedule 13D and 13G filings on Proto Labs Inc, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on PRLB
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 14, 20263:55 PM ETDisciplined Growth Investors Inc13G/A10.00%2.38M shares−0.50 ppfrom 10.50%Jun 30, 2026SEC
Jul 14, 20261:27 PM ETDimensional Fund Advisors LP13G/A4.80%1.15M shares−0.50 ppfrom 5.30%Below 5%Jun 30, 2026SEC
May 15, 20264:26 PM ETDisciplined Growth Investors Inc13G/A10.50%2.50M shares−0.80 ppfrom 11.30%Mar 31, 2026SEC
Apr 30, 202612:07 PM ETVanguard Capital Management LLC13G5.10%1.21M sharesNewMar 31, 2026SEC
Apr 29, 20262:49 PM ETVanguard Portfolio Management LLC13G6.51%1.55M sharesNewMar 31, 2026SEC
Mar 27, 202611:36 AM ETVanguard Group Inc13G/A0.00%0 shares–Below 5%Mar 13, 2026SEC
Feb 17, 20264:38 PM ETDisciplined Growth Investors Inc13G/A11.30%2.67M shares+0.40 ppfrom 10.90%Dec 31, 2025SEC
Nov 14, 20253:59 PM ETDisciplined Growth Investors Inc13G/A10.90%2.59M shares−0.50 ppfrom 11.40%Sep 30, 2025SEC
Aug 14, 20257:25 PM ETDisciplined Growth Investors Inc13G/A11.40%2.72M shares+0.20 ppfrom 11.20%Jun 30, 2025SEC
Jul 17, 20258:12 PM ETBlackRock, Inc.13G/A15.00%3.55M shares–Jun 30, 2025SEC
May 15, 20254:26 PM ETDisciplined Growth Investors Inc13G/A11.20%2.67M shares+2.30 ppfrom 8.90%Mar 31, 2025SEC
Feb 14, 20253:07 PM ETDisciplined Growth Investors Inc13G/A8.90%2.17M shares+0.50 ppfrom 8.40%Dec 31, 2024SEC
Jan 23, 20253:55 PM ETDimensional Fund Advisors LP13G5.30%1.30M sharesNewDec 31, 2024SEC
Nov 14, 20244:36 PM ETDisciplined Growth Investors Inc13G/A8.40%2.06M shares–Sep 30, 2024SEC
Nov 8, 2024BlackRock, Inc.13G/AOld format–––SEC
Oct 18, 2024BlackRock, Inc.13G/AOld format–––SEC
Feb 14, 2024Disciplined Growth Investors Inc13G/AOld format–––SEC
Feb 13, 2024Vanguard Group Inc13G/AOld format–––SEC
Jan 22, 20242:03 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 14, 2023Brown Capital Management LLC13G/AOld format–––SEC
Feb 14, 2023Disciplined Growth Investors Inc13G/AOld format–––SEC
Feb 9, 2023Vanguard Group Inc13G/AOld format–––SEC
Jan 23, 20233:52 PM ETBlackRock Inc.13G/AOld format–––SEC
Mar 9, 2022Vanguard Group Inc13G/AOld format–––SEC
Feb 15, 2022Disciplined Growth Investors Inc13GOld format–New–SEC
Feb 14, 2022Brown Capital Management LLC13G/AOld format–––SEC
Feb 14, 2022Nikko Asset Management Americas, Inc.13G/AOld format–––SEC
Feb 14, 2022Harding Loevner LP13G/AOld format–––SEC
Feb 10, 2022Vanguard Group Inc13G/AOld format–––SEC
Feb 4, 2022Sumitomo Mitsui Trust Holdings, Inc.13G/AOld format–––SEC
Jan 27, 20225:13 PM ETBlackRock Inc.13G/AOld format–––SEC
Jan 26, 20229:17 AM ETBlackRock Inc.13G/AOld format–––SEC
Jan 21, 2022Riverbridge Partners LLC13G/AOld format–––SEC
Jan 21, 2022Riverbridge Partners LLC13G/AOld format–––SEC
Jun 10, 2021Brown Capital Management LLC13G/AOld format–––SEC
Feb 16, 2021ARK Investment Management LLCSuperinvestorARK Invest13G/AOld format–––SEC
Feb 16, 2021Harding Loevner LP13GOld format–New–SEC
Feb 12, 2021Brown Capital Management LLC13G/AOld format–––SEC
Feb 11, 2021Nikko Asset Management Americas, Inc.13GOld format–New–SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Feb 5, 2021Sumitomo Mitsui Trust Holdings, Inc.13GOld format–New–SEC
Jan 25, 20214:49 PM ETBlackRock Inc.13GOld format–New–SEC
Jan 25, 2021Riverbridge Partners LLC13G/AOld format–––SEC

Form 144: proposed insider sales

3 notices from officers, directors and other affiliates planning to sell Proto Labs Inc shares, newest first.

Form 144 notices for PRLB
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Sep 25, 20264:21 PM ETMichael R KenisonFormer officer1.14K$109.5KSep 25, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Sep 24, 20264:42 PM ETDaniel SchumacherOfficer5.00K$445.6KSep 24, 202610b5-1Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Sep 24, 20264:17 PM ETMichael R KenisonFormer officer1.80K$172.5KSep 24, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC