Proto Labs, Inc.
US ˙ NYSE ˙ US7437131094

SecurityPRLB / Proto Labs, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership20,740 shares
Latest Disclosed Value $ 1,049,237
Alliancebernstein L.p. ownership in PRLB / Proto Labs, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 20,740 shares of Proto Labs, Inc. (US:PRLB) valued at $1,182,595 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 20,740 shares of Proto Labs, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $1,548,656 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)
2026-05-15 2026-03-31 13F PROTO LABS COM 743713109 20,740 0 0.00 1,049 0.00 0.0003
2026-02-17 2025-12-31 13F PROTO LABS COM 743713109 20,740 -7,100 -25.50 1,049 -24.64 0.0003
2025-11-14 2025-09-30 13F PROTO LABS COM 743713109 27,840 -4,000 -12.56 1,393 9.26 0.0004
2025-08-14 2025-06-30 13F PROTO LABS COM 743713109 31,840 0 0.00 1,275 14.26 0.0004
2025-05-15 2025-03-31 13F PROTO LABS COM 743713109 31,840 -3,430 -9.72 1,116 -19.09 0.0004
2025-02-12 2024-12-31 13F PROTO LABS COM 743713109 35,270 0 0.00 1,379 33.14 0.0005
2024-11-14 2024-09-30 13F PROTO LABS COM 743713109 35,270 3,430 10.77 1,036 5.29 0.0003
2024-08-14 2024-06-30 13F PROTO LABS COM 743713109 31,840 -170 -0.53 984 -14.07 0.0003
2024-05-14 2024-03-31 13F PROTO LABS COM 743713109 32,010 0 0.00 1,144 -8.26 0.0004
2024-02-14 2023-12-31 13F PROTO LABS COM 743713109 32,010 -1,860 -5.49 1,247 39.49 0.0005
2023-11-14 2023-09-30 13F PROTO LABS COM 743713109 33,870 0 0.00 894 -24.49 0.0004
2023-08-15 2023-06-30 13F PROTO LABS COM 743713109 33,870 -540 -1.57 1,184 3.86 0.0005
2023-05-15 2023-03-31 13F PROTO LABS COM 743713109 34,410 -1,002 -2.83 1,141 26.11 0.0005
2023-02-15 2022-12-31 13F PROTO LABS COM 743713109 35,412 -7,433 -17.35 904 -42.09 0.0004
2022-11-15 2022-09-30 13F PROTO LABS COM 743713109 42,845 -1,663 -3.74 1,561 -26.68 0.0008
2022-08-15 2022-06-30 13F PROTO LABS COM 743713109 44,508 520 1.18 2,129 -8.51 0.0010
2022-05-13 2022-03-31 13F PROTO LABS COM 743713109 43,988 -61 -0.14 2,327 2.87 0.0009
2022-02-14 2021-12-31 13F PROTO LABS COM 743713109 44,049 -3,739 -7.82 2,262 -28.93 0.0008
2021-11-10 2021-09-30 13F PROTO LABS COM 743713109 47,788 -1,835 -3.70 3,183 -30.12 0.0013
2021-07-30 2021-06-30 13F PROTO LABS COM 743713109 49,623 2,380 5.04 4,555 -20.81 0.0018
2021-05-06 2021-03-31 13F PROTO LABS COM 743713109 47,243 560 1.20 5,752 -19.68 0.0025
2021-02-08 2020-12-31 13F PROTO LABS COM 743713109 46,683 -187 -0.40 7,161 17.97 0.0034
2020-11-12 2020-09-30 13F PROTO LABS COM 743713109 46,870 -2,940 -5.90 6,070 8.35 0.0033
2020-08-13 2020-06-30 13F PROTO LABS COM 743713109 49,810 2,190 4.60 5,602 54.54 0.0033
2020-05-14 2020-03-31 13F PROTO LABS COM 743713109 47,620 50 0.11 3,625 -24.96 0.0026
2020-02-18 2019-12-31 13F PROTO LABS COM 743713109 47,570 134 0.28 4,831 -0.25 0.0027
2019-11-14 2019-09-30 13F PROTO LABS COM 743713109 47,436 -4,514 -8.69 4,843 -19.64 0.0030
2019-08-14 2019-06-30 13F PROTO LABS COM 743713109 51,950 14,100 37.25 6,027 51.43 0.0037
2019-05-14 2019-03-31 13F PROTO LABS COM 743713109 37,850 0 0.00 3,980 -6.77 0.0026
2019-02-13 2018-12-31 13F PROTO LABS COM 743713109 37,850 200 0.53 4,269 -29.90 0.0032
2018-11-08 2018-09-30 13F PROTO LABS COM 743713109 37,650 0 0.00 6,090 36.00 0.0040
2018-08-13 2018-06-30 13F PROTO LABS COM 743713109 37,650 1,400 3.86 4,478 5.09 0.0031
2018-05-14 2018-03-31 13F PROTO LABS COM 743713109 36,250 -600 -1.63 4,261 12.25 0.0031
2018-02-13 2017-12-31 13F PROTO LABS COM 743713109 36,850 -600 -1.60 3,796 26.24 0.0027
2017-11-13 2017-09-30 13F PROTO LABS COM 743713109 37,450 0 0.00 3,007 19.37 0.0023
2017-08-10 2017-06-30 13F PROTO LABS COM 743713109 37,450 -900 -2.35 2,519 28.52 0.0019
2017-05-11 2017-03-31 13F PROTO LABS COM 743713109 38,350 0 0.00 1,960 -0.46 0.0016
2017-02-13 2016-12-31 13F PROTO LABS COM 743713109 38,350 -83 -0.22 1,969 -14.50 0.0016
2016-11-10 2016-09-30 13F PROTO LABS COM 743713109 38,433 83 0.22 2,303 4.35 0.0019
2016-08-11 2016-06-30 13F PROTO LABS COM 743713109 38,350 7,800 25.53 2,207 -6.28 0.0019
2016-05-13 2016-03-31 13F PROTO LABS COM 743713109 30,550 -1,100 -3.48 2,355 16.82 0.0020
2016-02-16 2015-12-31 13F/A-1 PROTO LABS COM 743713109 31,650 -2,316 -6.82 2,016 -11.42 0.0017
2016-02-12 2015-12-31 13F PROTO LABS COM 743713109 31,650 2,121
2015-11-13 2015-09-30 13F PROTO LABS COM 743713109 33,966 166 0.49 2,276 -0.22 0.0020
2015-08-14 2015-06-30 13F PROTO LABS COM 743713109 33,800 700 2.11 2,281 -1.55 0.0019
2015-05-13 2015-03-31 13F PROTO LABS COM 743713109 33,100 -4,300 -11.50 2,317 -7.76 0.0019
2015-02-13 2014-12-31 13F PROTO LABS COM 743713109 37,400 -51,451 -57.91 2,512 -59.03 0.0021
2014-11-13 2014-09-30 13F PROTO LABS COM 743713109 88,851 -94,487 -51.54 6,131 -59.18 0.0052
2014-08-13 2014-06-30 13F PROTO LABS COM 743713109 183,338 0 0.00 15,019 21.06 0.0127
2014-05-13 2014-03-31 13F PROTO LABS COM 743713109 183,338 -6,705 -3.53 12,406 -8.29 0.0107
2014-02-13 2013-12-31 13F PROTO LABS COM 743713109 190,043 -6,395 -3.26 13,527 -9.86 0.0121
2013-11-14 2013-09-30 13F PROTO LABS COM 743713109 196,438 -78,019 -28.43 15,006 -15.84 0.0148
2013-08-13 2013-06-30 13F PROTO LABS COM 743713109 274,457 274,457 17,831 0.0189
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.