Mesa Laboratories, Inc.
US ˙ NasdaqGS ˙ US59064R1095

SecurityMLAB / Mesa Laboratories, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership124,630 shares
Latest Disclosed Value $ 11,017,953
Dimensional Fund Advisors Lp reports 7.10% increase in ownership of MLAB / Mesa Laboratories, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 124,630 shares of Mesa Laboratories, Inc. (US:MLAB) valued at $11,019,785 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 116,363 shares of Mesa Laboratories, Inc.. This represents a change in shares of 7.10% during the quarter. The current value of the position is $12,947,811 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)
2026-05-07 2026-03-31 13F MESA LABS COM 59064R109 124,630 8,267 7.10 11,018 20.62 0.0023
2026-02-12 2025-12-31 13F MESA LABS COM 59064R109 116,363 -409 -0.35 9,135 16.76 0.0019
2025-11-12 2025-09-30 13F MESA LABS COM 59064R109 116,772 1,488 1.29 7,823 -27.99 0.0017
2025-08-12 2025-06-30 13F MESA LABS COM 59064R109 115,284 4,037 3.63 10,864 -17.70 0.0025
2025-05-13 2025-03-31 13F MESA LABS COM 59064R109 111,247 -2,603 -2.29 13,201 -12.08 0.0033
2025-02-13 2024-12-31 13F MESA LABS COM 59064R109 113,850 -9,723 -7.87 15,013 -6.44 0.0036
2024-11-07 2024-09-30 13F MESA LABS COM 59064R109 123,573 -8,318 -6.31 16,047 40.23 0.0039
2024-08-09 2024-06-30 13F MESA LABS COM 59064R109 131,891 8,722 7.08 11,444 -15.33 0.0030
2024-05-10 2024-03-31 13F MESA LABS COM 59064R109 123,169 -4,066 -3.20 13,515 1.39 0.0037
2024-02-07 2023-12-31 13F MESA LABS COM 59064R109 127,235 -764 -0.60 13,331 -0.88 0.0039
2023-11-09 2023-09-30 13F MESA LABS COM 59064R109 127,999 -3,058 -2.33 13,449 -20.15 0.0044
2023-08-09 2023-06-30 13F MESA LABS COM 59064R109 131,057 24,245 22.70 16,842 -9.75 0.0054
2023-05-12 2023-03-31 13F MESA LABS COM 59064R109 106,812 28,386 36.19 18,663 143,453.85 0.0063
2023-02-09 2022-12-31 13F MESA LABS COM 59064R109 78,426 5,371 7.35 13 -99.87 0.0039
2022-11-10 2022-09-30 13F MESA LABS COM 59064R109 73,055 2,457 3.48 10,288 -28.54 0.0039
2022-08-12 2022-06-30 13F MESA LABS COM 59064R109 70,598 9,205 14.99 14,397 -7.99 0.0052
2022-05-13 2022-03-31 13F MESA LABS COM 59064R109 61,393 3,405 5.87 15,648 -17.75 0.0048
2022-02-09 2021-12-31 13F MESA LABS COM 59064R109 57,988 12,894 28.59 19,026 39.54 0.0058
2021-11-12 2021-09-30 13F MESA LABS COM 59064R109 45,094 20,782 85.48 13,635 106.81 0.0044
2021-08-12 2021-06-30 13F MESA LABS COM 59064R109 24,312 4,755 24.31 6,593 38.45 0.0021
2021-05-14 2021-03-31 13F MESA LABS COM 59064R109 19,557 14,920 321.76 4,762 258.31 0.0016
2021-03-08 2020-12-31 13F/A-2 MESA LABS COM 59064R109 4,637 -16,558 -78.12 1,329 -75.39 0.0005
2021-02-11 2020-12-31 13F MESA LABS COM 59064R109 4,637 -16,558 1,329 479.9642
2020-11-12 2020-09-30 13F MESA LABS COM 59064R109 21,195 -42,908 -66.94 5,400 -61.15 0.0023
2020-08-13 2020-06-30 13F MESA LABS COM 59064R109 64,103 -31,711 -33.10 13,898 -35.84 0.0061
2020-05-14 2020-03-31 13F MESA LABS COM 59064R109 95,814 -26,058 -21.38 21,663 -28.73 0.0113
2020-02-14 2019-12-31 13F MESA LABS COM 59064R109 121,872 -16,316 -11.81 30,395 -7.49 0.0111
2019-11-12 2019-09-30 13F MESA LABS COM 59064R109 138,188 -166 -0.12 32,856 -2.80 0.0128
2019-08-13 2019-06-30 13F MESA LABS COM 59064R109 138,354 -508 -0.37 33,804 5.61 0.0131
2019-08-12 2019-03-31 13F/A-2 MESA LABS COM 59064R109 138,862 -1,745 -1.24 32,009 9.24 0.0127
2019-05-10 2019-03-31 13F MESA LABS COM 59064R109 138,862 -1,745 32,009
2019-02-26 2018-12-31 13F/A-1 MESA LABS COM 59064R109 140,607 1,910 1.38 29,301 13.81 0.0133
2019-02-13 2018-12-31 13F MESA LABS COM 59064R109 140,607 1,910 29,301
2018-11-13 2018-09-30 13F MESA LABS COM 59064R109 138,697 5,130 3.84 25,745 -8.68 0.0098
2018-08-10 2018-06-30 13F MESA LABS COM 59064R109 133,567 -486 -0.36 28,192 41.68 0.0112
2018-05-11 2018-03-31 13F MESA LABS COM 59064R109 134,053 -99 -0.07 19,899 19.33 0.0083
2018-02-12 2017-12-31 13F MESA LABS COM 59064R109 134,152 5,495 4.27 16,675 -13.20 0.0069
2017-11-13 2017-09-30 13F MESA LABS COM 59064R109 128,657 -663 -0.51 19,211 3.66 0.0084
2017-08-11 2017-06-30 13F MESA LABS COM 59064R109 129,320 4,634 3.72 18,532 21.13 0.0086
2017-05-12 2017-03-31 13F MESA LABS COM 59064R109 124,686 5,458 4.58 15,299 4.54 0.0073
2017-02-09 2016-12-31 13F MESA LABS COM 59064R109 119,228 5,426 4.77 14,635 12.46 0.0073
2016-11-10 2016-09-30 13F MESA LABS COM 59064R109 113,802 -1,665 -1.44 13,014 -8.37 0.0070
2016-08-09 2016-06-30 13F MESA LABS COM 59064R109 115,467 3,910 3.50 14,202 32.12 0.0082
2016-05-13 2016-03-31 13F MESA LABS COM 59064R109 111,557 2,117 1.93 10,749 -1.29 0.0064
2016-02-10 2015-12-31 13F MESA LABS COM 59064R109 109,440 2,602 2.44 10,889 -8.51 0.0068
2015-11-13 2015-09-30 13F MESA LABS COM 59064R109 106,838 293 0.28 11,902 25.65 0.0078
2015-08-14 2015-06-30 13F MESA LABS COM 59064R109 106,545 -1,258 -1.17 9,472 21.70 0.0058
2015-05-14 2015-03-31 13F MESA LABS COM 59064R109 107,803 1,995 1.89 7,783 -4.85 0.0049
2015-02-06 2014-12-31 13F MESA LABS COM 59064R109 105,808 1,173 1.12 8,180 35.30 0.0054
2014-11-13 2014-09-30 13F MESA LABS COM 59064R109 104,635 -634 -0.60 6,046 -31.59 0.0043
2014-08-08 2014-06-30 13F MESA LABS COM 59064R109 105,269 2,914 2.85 8,838 -4.33 0.0061
2014-05-14 2014-03-31 13F MESA LABS COM 59064R109 102,355 2,945 2.96 9,238 18.25 0.0069
2014-02-12 2013-12-31 13F MESA LABS COM 59064R109 99,410 4,544 4.79 7,812 21.80 0.0061
2013-11-13 2013-09-30 13F MESA LABS COM 59064R109 94,866 -1,364 -1.42 6,414 23.13 0.0056
2013-08-15 2013-06-30 13F MESA LABS COM 59064R109 96,230 96,230 5,209 0.0049
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.