Proto Labs, Inc.
US ˙ NYSE ˙ US7437131094

SecurityPRLB / Proto Labs, Inc.
InstitutionUs Bancorp \de\
Latest Disclosed Ownership362 shares
Latest Disclosed Value $ 20,641
Us Bancorp \de\ reports 10.70% increase in ownership of PRLB / Proto Labs, Inc.

On May 14, 2026 - Us Bancorp \de\ filed a 13F-HR form disclosing ownership of 362 shares of Proto Labs, Inc. (US:PRLB) valued at $20,641 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 327 shares of Proto Labs, Inc.. This represents a change in shares of 10.70% during the quarter. The current value of the position is $27,031 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)
2026-05-14 2026-03-31 13F PROTO LABS COM 743713109 362 35 10.70 21 25.00 0.0000
2026-01-30 2025-12-31 13F PROTO LABS COM 743713109 327 0 0.00 17 0.00 0.0000
2025-11-12 2025-09-30 13F PROTO LABS COM 743713109 327 -233 -41.61 16 -27.27 0.0000
2025-07-24 2025-06-30 13F PROTO LABS COM 743713109 560 -2,000 -78.12 22 -75.28 0.0000
2025-05-08 2025-03-31 13F PROTO LABS COM 743713109 2,560 0 0.00 90 -11.00 0.0001
2025-02-05 2024-12-31 13F PROTO LABS COM 743713109 2,560 -223 -8.01 100 23.46 0.0001
2024-10-28 2024-09-30 13F PROTO LABS COM 743713109 2,783 -7,608 -73.22 82 -74.69 0.0001
2024-08-07 2024-06-30 13F PROTO LABS COM 743713109 10,391 -5,182 -33.28 321 -42.45 0.0004
2024-05-08 2024-03-31 13F PROTO LABS COM 743713109 15,573 -1,571 -9.16 557 -16.64 0.0008
2024-02-09 2023-12-31 13F PROTO LABS COM 743713109 17,144 9,460 123.11 668 230.20 0.0010
2023-11-03 2023-09-30 13F PROTO LABS COM 743713109 7,684 -597 -7.21 203 -30.10 0.0003
2023-08-10 2023-06-30 13F PROTO LABS COM 743713109 8,281 -182 -2.15 290 3.21 0.0005
2023-05-09 2023-03-31 13F PROTO LABS COMMON STOCK 743713109 8,463 -511 -5.69 281 22.27 0.0005
2023-02-13 2022-12-31 13F PROTO LABS COMMON STOCK 743713109 8,974 -1,882 -17.34 229 -42.03 0.0004
2022-10-27 2022-09-30 13F PROTO LABS COMMON STOCK 743713109 10,856 -920 -7.81 395 -29.96 0.0008
2022-08-01 2022-06-30 13F PROTO LABS COMMON STOCK 743713109 11,776 -184 -1.54 564 -10.90 0.0011
2022-05-11 2022-03-31 13F PROTO LABS COMMON STOCK 743713109 11,960 -2,261 -15.90 633 -13.52 0.0011
2022-02-11 2021-12-31 13F PROTO LABS COMMON STOCK 743713109 14,221 -8,250 -36.71 732 -51.10 0.0012
2021-11-10 2021-09-30 13F PROTO LABS COMMON STOCK 743713109 22,471 452 2.05 1,497 -25.93 0.0028
2021-08-05 2021-06-30 13F PROTO LABS COMMON STOCK 743713109 22,019 -1,094 -4.73 2,021 -28.18 0.0038
2021-04-28 2021-03-31 13F PROTO LABS COMMON STOCK 743713109 23,113 -30,880 -57.19 2,814 -66.03 0.0057
2021-02-04 2020-12-31 13F PROTO LABS COMMON STOCK 743713109 53,993 -1,009 -1.83 8,283 16.30 0.0178
2020-11-10 2020-09-30 13F PROTO LABS COMMON STOCK 743713109 55,002 8,568 18.45 7,122 36.38 0.0174
2020-08-07 2020-06-30 13F PROTO LABS COMMON STOCK 743713109 46,434 -4,184 -8.27 5,222 35.53 0.0137
2020-05-13 2020-03-31 13F PROTO LABS COMMON STOCK 743713109 50,618 -1,122 -2.17 3,853 -26.67 0.0120
2020-02-04 2019-12-31 13F PROTO LABS COMMON STOCK 743713109 51,740 -740 -1.41 5,254 -1.92 0.0134
2019-11-08 2019-09-30 13F PROTO LABS COMMON STOCK 743713109 52,480 3,553 7.26 5,357 -5.62 0.0146
2019-08-13 2019-06-30 13F PROTO LABS COMMON STOCK 743713109 48,927 192 0.39 5,676 10.79 0.0158
2019-05-08 2019-03-31 13F PROTO LABS COMMON STOCK 743713109 48,735 -286 -0.58 5,123 -7.36 0.0148
2019-02-13 2018-12-31 13F PROTO LABS COMMON STOCK 743713109 49,021 -1,138 -2.27 5,530 -31.85 0.0179
2018-10-31 2018-09-30 13F PROTO LABS COMMON STOCK 743713109 50,159 -2,258 -4.31 8,114 30.14 0.0235
2018-08-08 2018-06-30 13F PROTO LABS COMMON STOCK 743713109 52,417 -794 -1.49 6,235 -0.32 0.0191
2018-05-08 2018-03-31 13F PROTO LABS COMMON STOCK 743713109 53,211 -1,065 -1.96 6,255 11.90 0.0192
2018-02-02 2017-12-31 13F PROTO LABS COMMON STOCK 743713109 54,276 1,149 2.16 5,590 31.04 0.0171
2017-11-13 2017-09-30 13F PROTO LABS COMMON STOCK 743713109 53,127 128 0.24 4,266 19.66 0.0137
2017-07-19 2017-06-30 13F PROTO LABS COMMON STOCK 743713109 52,999 -1,007 -1.86 3,565 29.17 0.0119
2017-05-03 2017-03-31 13F PROTO LABS COMMON STOCK 743713109 54,006 -1,119 -2.03 2,760 -2.51 0.0095
2017-02-08 2016-12-31 13F PROTO LABS COMMON STOCK 743713109 55,125 3,579 6.94 2,831 -8.32 0.0102
2016-11-04 2016-09-30 13F PROTO LABS COMMON STOCK 743713109 51,546 -1,966 -3.67 3,088 0.29 0.0114
2016-08-10 2016-06-30 13F PROTO LABS COMMON STOCK 743713109 53,512 -155 -0.29 3,079 -25.57 0.0117
2016-05-13 2016-03-31 13F PROTO LABS COMMON STOCK 743713109 53,667 -6,623 -10.99 4,137 7.73 0.0163
2016-02-10 2015-12-31 13F PROTO LABS COMMON STOCK 743713109 60,290 -2,549 -4.06 3,840 -8.81 0.0154
2015-11-16 2015-09-30 13F PROTO LABS COMMON STOCK 743713109 62,839 13,957 28.55 4,211 27.64 0.0177
2015-08-10 2015-06-30 13F PROTO LABS COMMON STOCK 743713109 48,882 -3,174 -6.10 3,299 -9.47 0.0128
2015-05-08 2015-03-31 13F PROTO LABS COMMON STOCK 743713109 52,056 10,639 25.69 3,644 30.98 0.0140
2015-02-13 2014-12-31 13F PROTO LABS COMMON STOCK 743713109 41,417 6,084 17.22 2,782 14.11 0.0108
2014-11-14 2014-09-30 13F PROTO LABS COMMON STOCK 743713109 35,333 -2,817 -7.38 2,438 -21.98 0.0099
2014-08-14 2014-06-30 13F PROTO LABS COMMON STOCK 743713109 38,150 37 0.10 3,125 21.17 0.0125
2014-05-14 2014-03-31 13F PROTO LABS COMMON STOCK 743713109 38,113 1,928 5.33 2,579 0.16 0.0106
2014-02-13 2013-12-31 13F PROTO LABS COMMON STOCK 743713109 36,185 2,378 7.03 2,575 -0.31 0.0104
2013-11-07 2013-09-30 13F PROTO LABS COMMON STOCK 743713109 33,807 4,567 15.62 2,583 35.95 0.0114
2013-08-09 2013-06-30 13F PROTO LABS COMMON STOCK 743713109 29,240 29,240 1,900 0.0087
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.