Proto Labs, Inc.
US ˙ NYSE ˙ US7437131094

SecurityPRLB / Proto Labs, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership12,160 shares
Latest Disclosed Value $ 692,877
Janus Henderson Group Plc reports 0.56% decrease in ownership of PRLB / Proto Labs, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 12,160 shares of Proto Labs, Inc. (US:PRLB) valued at $693,363 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 12,228 shares of Proto Labs, Inc.. This represents a change in shares of -0.56% during the quarter. The current value of the position is $907,987 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-18 2026-03-31 13F/A-1 PROTO LABS COM 743713109 12,160 -68 -0.56 693 11.97 0.0001
2026-05-15 2026-03-31 13F PROTO LABS COM 743713109 12,160 -68 -0.56 693 11.97 0.0001
2026-02-17 2025-12-31 13F PROTO LABS COM 743713109 12,228 68 0.56 618 1.64 0.0003
2025-11-14 2025-09-30 13F PROTO LABS COM 743713109 12,160 0 0.00 609 25.10 0.0003
2025-08-14 2025-06-30 13F PROTO LABS COM 743713109 12,160 0 0.00 487 11.98 0.0002
2025-05-15 2025-03-31 13F PROTO LABS COM 743713109 12,160 0 0.00 435 -8.63 0.0002
2025-02-14 2024-12-31 13F PROTO LABS COM 743713109 12,160 0 0.00 476 33.05 0.0002
2024-11-14 2024-09-30 13F PROTO LABS COM 743713109 12,160 0 0.00 357 -4.80 0.0002
2024-08-14 2024-06-30 13F PROTO LABS COM 743713109 12,160 -132 -1.07 375 -14.58 0.0002
2024-05-15 2024-03-31 13F PROTO LABS COM 743713109 12,292 0 0.00 439 -8.16 0.0002
2024-02-14 2023-12-31 13F PROTO LABS COM 743713109 12,292 -21 -0.17 479 47.08 0.0003
2023-11-14 2023-09-30 13F PROTO LABS COM 743713109 12,313 0 0.00 325 -24.42 0.0002
2023-08-14 2023-06-30 13F PROTO LABS COM 743713109 12,313 -20 -0.16 430 5.39 0.0003
2023-05-15 2023-03-31 13F PROTO LABS COM 743713109 12,333 12,333 409 0.0003
2023-02-14 2022-12-31 13F PROTO LABS COM 743713109 0 -5,606 -100.00 0 -100.00
2022-11-14 2022-09-30 13F PROTO LABS COM 743713109 5,606 11 0.20 204 -23.88 0.0002
2022-08-15 2022-06-30 13F PROTO LABS COM 743713109 5,595 -11 -0.20 268 -9.46 0.0002
2022-05-16 2022-03-31 13F PROTO LABS COM 743713109 5,606 0 0.00 296 2.78 0.0001
2022-02-14 2021-12-31 13F PROTO LABS COM 743713109 5,606 5,606 288 0.0001
2021-05-17 2021-03-31 13F PROTO LABS COM 743713109 0 -3,289 -100.00 0 -100.00
2021-02-16 2020-12-31 13F PROTO LABS COM 743713109 3,289 -3,722 -53.09 505 -44.38 0.0002
2020-11-16 2020-09-30 13F PROTO LABS COM 743713109 7,011 -105,388 -93.76 908 -92.82 0.0005
2020-08-14 2020-06-30 13F PROTO LABS COM 743713109 112,399 -14,322 -11.30 12,642 31.05 0.0071
2020-05-14 2020-03-31 13F PROTO LABS COM 743713109 126,721 -1,092,712 -89.61 9,647 -92.21 0.0066
2020-02-18 2019-12-31 13F PROTO LABS COM 743713109 1,219,433 226,226 22.78 123,833 22.12 0.0634
2019-11-14 2019-09-30 13F PROTO LABS COM 743713109 993,207 214 0.02 101,406 -11.98 0.0549
2019-07-31 2019-06-30 13F PROTO LABS COM 743713109 992,993 -5,989 -0.60 115,207 9.69 0.0627
2019-04-30 2019-03-31 13F PROTO LABS COM 743713109 998,982 -5,956 -0.59 105,033 -7.33 0.0582
2019-02-06 2018-12-31 13F PROTO LABS COM 743713109 1,004,938 -60,118 -5.64 113,347 -34.21 0.0723
2018-11-09 2018-09-30 13F PROTO LABS COM 743713109 1,065,056 -38,671 -3.50 172,273 31.22 0.0921
2018-08-10 2018-06-30 13F PROTO LABS COM 743713109 1,103,727 11,783 1.08 131,288 2.28 0.0748
2018-05-14 2018-03-31 13F PROTO LABS COM 743713109 1,091,944 -73,458 -6.30 128,358 6.93 0.0756
2018-03-12 2017-12-31 13F/A-1 PROTO LABS COM 743713109 1,165,402 -51,794 -4.26 120,036 22.81 0.0739
2018-02-09 2017-12-31 13F PROTO LABS COM 743713109 1,165,402 -51,794 120,036
2017-11-14 2017-09-30 13F PROTO LABS COM 743713109 1,217,196 -84,233 -6.47 97,741 11.68 0.0626
2017-08-17 2017-06-30 13F/A-1 PROTO LABS COM 743713109 1,301,429 1,046,960 411.43 87,521 573.08 0.0596
2017-08-14 2017-06-30 13F PROTO LABS COM 743713109 1,301,429 1,046,960 87,521
2017-05-03 2017-03-31 13F PROTO LABS COM 743713109 254,469 -10,402 -3.93 13,003 -4.40 0.0913
2017-01-30 2016-12-31 13F PROTO LABS COM 743713109 264,871 -776 -0.29 13,601 -14.54 0.1003
2016-10-24 2016-09-30 13F PROTO LABS COM 743713109 265,647 -1,772 -0.66 15,915 3.39 0.1173
2016-07-29 2016-06-30 13F PROTO LABS COM 743713109 267,419 97,755 57.62 15,393 17.69 0.1280
2016-05-12 2016-03-31 13F PROTO LABS COM 743713109 169,664 -4,910 -2.81 13,079 17.63 0.1061
2016-02-03 2015-12-31 13F PROTO LABS COM 743713109 174,574 2,770 1.61 11,119 -3.41 0.0892
2015-11-16 2015-09-30 13F PROTO LABS COM 743713109 171,804 4,974 2.98 11,511 2.25 0.1014
2015-08-17 2015-06-30 13F PROTO LABS COM 743713109 166,830 44,139 35.98 11,258 -0.99 0.0885
2015-06-02 2015-03-31 13F/A-1 PROTO LABS COM 743713109 122,691 -9,758 -7.37 11,370 27.82 0.0877
2015-05-15 2015-03-31 13F PROTO LABS COM 743713109 122,691 11,370
2015-02-12 2014-12-31 13F PROTO LABS COM 743713109 132,449 -56,600 -29.94 8,895 -33.91 0.0641
2014-01-14 2013-12-31 13F PROTO LABS COM 743713109 189,049 -2,254 -1.18 13,459 -7.87 0.1360
2013-11-12 2013-09-30 13F PROTO LABS COM 743713109 191,303 -6,252 -3.16 14,609 12.33 0.1612
2013-08-15 2013-06-30 13F PROTO LABS COM 743713109 197,555 197,555 13,006 0.1520
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.