Mesa Laboratories, Inc.
US ˙ NasdaqGS ˙ US59064R1095

SecurityMLAB / Mesa Laboratories, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership162,116 shares
Latest Disclosed Value $ 14,334,351
Morgan Stanley reports 7.67% decrease in ownership of MLAB / Mesa Laboratories, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 162,116 shares of Mesa Laboratories, Inc. (US:MLAB) valued at $14,334,297 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 175,589 shares of Mesa Laboratories, Inc.. This represents a change in shares of -7.67% during the quarter. The current value of the position is $17,691,719 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 MESA LABS COM 59064R109 162,116 -13,473 -7.67 14,334 4.00 0.0009
2026-05-27 2025-12-31 13F/A-1 MESA LABS COM 59064R109 175,589 -79,385 -31.13 13,784 -19.33 0.0008
2026-02-13 2025-12-31 13F MESA LABS COM 59064R109 175,589 -79,385 13,784 0.0008
2026-05-27 2025-09-30 13F/A-1 MESA LABS COM 59064R109 254,974 36,178 16.54 17,086 -17.12 0.0010
2025-11-14 2025-09-30 13F MESA LABS COM 59064R109 254,974 36,178 17,086 0.0010
2025-08-15 2025-06-30 13F MESA LABS COM 59064R109 218,796 2,506 1.16 20,615 -19.68 0.0013
2025-05-15 2025-03-31 13F MESA LABS COM 59064R109 216,290 -24,236 -10.08 25,665 -19.08 0.0018
2025-05-15 2024-12-31 13F/A-1 MESA LABS COM 59064R109 240,526 -8,822 -3.54 31,718 -2.04 0.0022
2025-02-14 2024-12-31 13F MESA LABS COM 59064R109 240,526 -8,822 31,718 0.0022
2025-05-14 2024-09-30 13F/A-2 MESA LABS COM 59064R109 249,348 11,759 4.95 32,380 57.07 0.0023
2025-02-14 2024-09-30 13F/A-1 MESA LABS COM 59064R109 249,348 11,759 32,380 0.0023
2024-11-14 2024-09-30 13F MESA LABS COM 59064R109 249,348 11,759 32,380 0.0003
2025-05-14 2024-06-30 13F/A-2 MESA LABS COM 59064R109 237,589 -13,835 -5.50 20,616 -25.28 0.0016
2024-10-17 2024-06-30 13F/A-1 MESA LABS COM 59064R109 237,589 -13,835 20,616 0.0016
2024-08-14 2024-06-30 13F MESA LABS COM 59064R109 237,589 -13,835 20,616 0.0016
2024-10-17 2024-03-31 13F/A-2 MESA LABS COM 59064R109 251,424 -9,900 -3.79 27,589 0.77 0.0022
2024-08-16 2024-03-31 13F/A-1 MESA LABS COM 59064R109 251,424 -9,900 27,589 0.0003
2024-05-15 2024-03-31 13F MESA LABS COM 59064R109 251,424 -9,900 27,589 0.0022
2024-08-16 2023-12-31 13F/A-1 MESA LABS COM 59064R109 261,324 17,971 7.38 27,379 7.07 0.0024
2024-02-13 2023-12-31 13F MESA LABS COM 59064R109 261,324 17,971 27,379 0.0024
2023-11-15 2023-09-30 13F MESA LABS COM 59064R109 243,353 -7,249 -2.89 25,569 -20.60 0.0026
2023-08-14 2023-06-30 13F MESA LABS COM 59064R109 250,602 -6,969 -2.71 32,202 -28.45 0.0032
2023-05-15 2023-03-31 13F MESA LABS COM 59064R109 257,571 -6,164 -2.34 45,005 2.67 0.0048
2023-02-14 2022-12-31 13F MESA LABS COM 59064R109 263,735 234,712 808.71 43,835 973.07 0.0050
2022-11-14 2022-09-30 13F MESA LABS COM 59064R109 29,023 -6,213 -17.63 4,085 -43.15 0.0006
2022-10-27 2022-06-30 13F/A-1 MESA LABS COM 59064R109 35,236 8,876 33.67 7,186 6.95 0.0009
2022-08-15 2022-06-30 13F MESA LABS COM 59064R109 35,236 8,876 7,186 0.0009
2022-10-27 2022-03-31 13F/A-1 MESA LABS COM 59064R109 26,360 4,829 22.43 6,719 -4.88 0.0009
2022-05-13 2022-03-31 13F MESA LABS COM 59064R109 26,360 4,829 6,719 0.0009
2022-02-14 2021-12-31 13F MESA LABS COM 59064R109 21,531 3,233 17.67 7,064 27.67 0.0009
2021-11-15 2021-09-30 13F MESA LABS COM 59064R109 18,298 -4,889 -21.09 5,533 -12.01 0.0007
2021-08-23 2021-06-30 13F/A-1 MESA LABS COM 59064R109 23,187 -11,487 -33.13 6,288 -25.52 0.0008
2021-08-16 2021-06-30 13F MESA LABS COM 59064R109 23,187 -11,487 6,288 0.0002
2021-05-17 2021-03-31 13F MESA LABS COM 59064R109 34,674 9,109 35.63 8,442 15.20 0.0012
2021-02-16 2020-12-31 13F MESA LABS COM 59064R109 25,565 11,945 87.70 7,328 111.12 0.0011
2020-11-13 2020-09-30 13F MESA LABS COM 59064R109 13,620 1,532 12.67 3,471 32.43 0.0007
2020-08-14 2020-06-30 13F MESA LABS COM 59064R109 12,088 1,879 18.41 2,621 13.56 0.0006
2020-05-26 2020-03-31 13F/A-1 MESA LABS COM 59064R109 10,209 -9,310 -47.70 2,308 -52.59 0.0006
2020-05-15 2020-03-31 13F MESA LABS COM 59064R109 10,209 -9,310 2,308 177.3025
2020-02-14 2019-12-31 13F MESA LABS COM 59064R109 19,519 1,957 11.14 4,868 16.57 0.0011
2019-11-14 2019-09-30 13F MESA LABS COM 59064R109 17,562 13,390 320.95 4,176 309.81 0.0011
2019-08-14 2019-06-30 13F MESA LABS COM 59064R109 4,172 -15,402 -78.69 1,019 -77.41 0.0003
2019-05-15 2019-03-31 13F MESA LABS COM 59064R109 19,574 10,203 108.88 4,511 130.98 0.0013
2019-02-14 2018-12-31 13F MESA LABS COM 59064R109 9,371 -249 -2.59 1,953 9.41 0.0006
2019-04-23 2018-09-30 13F/A-2 MESA LABS COM 59064R109 9,620 -3,439 -26.33 1,785 -35.23 0.0004
2018-11-20 2018-09-30 13F/A-1 MESA LABS COM 59064R109 9,620 0 1,785 0.0004
2018-11-14 2018-09-30 13F MESA LABS COM 59064R109 9,620 -3,439 1,785
2019-04-23 2018-06-30 13F/A-1 MESA LABS COM 59064R109 13,059 21 0.16 2,756 42.36 0.0007
2018-08-14 2018-06-30 13F MESA LABS COM 59064R109 13,059 21 2,756
2019-04-23 2018-03-31 13F/A-1 MESA LABS COM 59064R109 13,038 404 3.20 1,936 23.31 0.0005
2018-05-14 2018-03-31 13F MESA LABS COM 59064R109 13,038 404 1,936
2019-04-23 2017-12-31 13F/A-1 MESA LABS COM 59064R109 12,634 2,452 24.08 1,570 3.29 0.0004
2018-02-14 2017-12-31 13F MESA LABS COM 59064R109 12,634 2,452 1,570
2017-11-14 2017-09-30 13F MESA LABS COM 59064R109 10,182 1,238 13.84 1,520 18.56 0.0005
2017-08-11 2017-06-30 13F MESA LABS COM 59064R109 8,944 -947 -9.57 1,282 5.60 0.0004
2017-05-22 2017-03-31 13F/A-1 MESA LABS COM 59064R109 9,891 -5,171 -34.33 1,214 -34.31 0.0004
2017-05-12 2017-03-31 13F MESA LABS COM 59064R109 9,891 1,214
2017-02-22 2016-12-31 13F/A-1 MESA LABS COM 59064R109 15,062 8,123 117.06 1,848 132.75 0.0006
2017-02-13 2016-12-31 13F MESA LABS COM 59064R109 15,062 1,848
2016-11-10 2016-09-30 13F MESA LABS COM 59064R109 6,939 -495 -6.66 794 -13.22 0.0003
2016-08-12 2016-06-30 13F MESA LABS COM 59064R109 7,434 381 5.40 915 34.76 0.0003
2016-05-12 2016-03-31 13F MESA LABS COM 59064R109 7,053 -670 -8.68 679 -11.70 0.0003
2016-02-09 2015-12-31 13F MESA LABS COM 59064R109 7,723 -2,203 -22.19 769 -30.47 0.0003
2016-02-08 2015-09-30 13F/A-1 MESA LABS COM 59064R109 9,926 1,705 20.74 1,106 51.30 0.0004
2015-11-09 2015-09-30 13F MESA LABS COM 59064R109 9,926 1,106
2015-08-12 2015-06-30 13F MESA LABS COM 59064R109 8,221 -15 -0.18 731 22.86 0.0003
2015-05-14 2015-03-31 13F MESA LABS COM 59064R109 8,236 -1,342 -14.01 595 -19.59 0.0002
2015-02-13 2014-12-31 13F MESA LABS COM 59064R109 9,578 -1,420 -12.91 740 16.35 0.0003
2014-12-16 2014-09-30 13F/A-1 MESA LABS COM 59064R109 10,998 9,263 533.89 636 307.69 0.0002
2014-11-14 2014-09-30 13F MESA LABS COM 59064R109 10,998 636
2014-05-13 2014-03-31 13F MESA LABS COM 59064R109 1,735 -8,045 -82.26 156 -79.71 0.0001
2014-02-13 2013-12-31 13F MESA LABS COM 59064R109 9,780 2,813 40.38 769 63.27 0.0003
2013-11-13 2013-09-30 13F MESA LABORATORIES INC COM S COM 59064R109 6,967 1,778 34.26 471 67.62 0.0002
2013-08-08 2013-06-30 13F MESA LABORATORIES INC COM S COM 59064R109 5,189 5,189 281 0.0001
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.