Mesa Laboratories, Inc.
US ˙ NasdaqGS ˙ US59064R1095

SecurityMLAB / Mesa Laboratories, Inc.
InstitutionRanger Investment Management, L.P.
Latest Disclosed Ownership202,903 shares
Latest Disclosed Value $ 17,940,683
Ranger Investment Management, L.P. reports 1.15% decrease in ownership of MLAB / Mesa Laboratories, Inc.

On May 15, 2026 - Ranger Investment Management, L.P. filed a 13F-HR form disclosing ownership of 202,903 shares of Mesa Laboratories, Inc. (US:MLAB) valued at $17,940,683 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 205,263 shares of Mesa Laboratories, Inc.. This represents a change in shares of -1.15% during the quarter. The current value of the position is $21,179,015 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 Laboratories COM 59064R109 202,903 -2,360 -1.15 17,941 11.34 1.2981
2026-02-13 2025-12-31 13F Mesa Laboratories COM 59064R109 205,263 -4,437 -2.12 16,113 14.68 1.1052
2025-11-05 2025-09-30 13F Mesa Laboratories COM 59064R109 209,700 -4,590 -2.14 14,052 -30.41 0.9797
2025-08-19 2025-06-30 13F Mesa Laboratories COM 59064R109 214,290 -16,698 -7.23 20,190 -26.34 1.4100
2025-05-15 2025-03-31 13F Mesa Laboratories COM 59064R109 230,988 -2,567 -1.10 27,409 -11.00 1.9588
2025-02-13 2024-12-31 13F Mesa Laboratories COM 59064R109 233,555 -4,635 -1.95 30,799 -0.43 1.9445
2024-11-04 2024-09-30 13F Mesa Laboratories COM 59064R109 238,190 7,721 3.35 30,931 54.68 1.9848
2024-08-14 2024-06-30 13F Mesa Laboratories COM 59064R109 230,469 1,315 0.57 19,998 -20.47 1.3606
2024-05-15 2024-03-31 13F Mesa Laboratories COM 59064R109 229,154 2,472 1.09 25,145 5.88 1.6170
2024-02-14 2023-12-31 13F Mesa Laboratories COM 59064R109 226,682 2,689 1.20 23,749 0.91 1.4399
2023-11-14 2023-09-30 13F Mesa Laboratories COM 59064R109 223,993 -9,050 -3.88 23,535 -21.41 1.5626
2023-08-14 2023-06-30 13F Mesa Laboratories COM 59064R109 233,043 8,677 3.87 29,946 -23.61 1.8024
2023-05-05 2023-03-31 13F Mesa Laboratories COM 59064R109 224,366 10,085 4.71 39,203 10.07 2.6272
2023-02-14 2022-12-31 13F Mesa Laboratories COM 59064R109 214,281 5,829 2.80 35,616 21.32 2.6438
2022-11-14 2022-09-30 13F Mesa Laboratories COM 59064R109 208,452 6,082 3.01 29,356 -28.87 2.3048
2022-08-15 2022-06-30 13F Mesa Laboratories COM 59064R109 202,370 33,787 20.04 41,271 -3.95 3.1235
2022-05-13 2022-03-31 13F Mesa Laboratories COM 59064R109 168,583 5,350 3.28 42,968 -19.77 2.7162
2022-02-11 2021-12-31 13F Mesa Laboratories COM 59064R109 163,233 -8,433 -4.91 53,555 3.18 2.9248
2021-11-15 2021-09-30 13F Mesa Laboratories COM 59064R109 171,666 23,988 16.24 51,905 29.61 2.7695
2021-08-16 2021-06-30 13F Mesa Laboratories COM 59064R109 147,678 -3,005 -1.99 40,046 9.14 2.0906
2021-05-17 2021-03-31 13F Mesa Laboratories COM 59064R109 150,683 -13,795 -8.39 36,691 -22.18 2.0194
2021-02-12 2020-12-31 13F Mesa Laboratories COM 59064R109 164,478 -8,587 -4.96 47,146 6.93 2.4856
2020-11-16 2020-09-30 13F Mesa Laboratories COM 59064R109 173,065 -1,623 -0.93 44,090 16.42 2.8048
2020-08-14 2020-06-30 13F Mesa Laboratories COM 59064R109 174,688 319 0.18 37,872 -3.93 2.5942
2020-05-15 2020-03-31 13F Mesa Laboratories COM 59064R109 174,369 -2,480 -1.40 39,423 -10.62 3.4681
2020-02-14 2019-12-31 13F Mesa Laboratories COM 59064R109 176,849 5,656 3.30 44,106 8.36 2.9084
2019-11-14 2019-09-30 13F Mesa Laboratories COM 59064R109 171,193 -993 -0.58 40,705 -3.25 2.9183
2019-08-14 2019-06-30 13F Mesa Laboratories COM 59064R109 172,186 -672 -0.39 42,072 5.59 2.8680
2019-05-15 2019-03-31 13F Mesa Laboratories COM 59064R109 172,858 15,839 10.09 39,844 21.77 2.8812
2019-02-14 2018-12-31 13F Mesa Laboratories COM 59064R109 157,019 67,492 75.39 32,721 96.90 2.6688
2018-11-14 2018-09-30 13F Mesa Laboratories COM 59064R109 89,527 75,681 546.59 16,618 468.53 1.0968
2018-08-14 2018-06-30 13F Mesa Laboratories COM 59064R109 13,846 -2,644 -16.03 2,923 19.40 0.2044
2018-05-15 2018-03-31 13F Mesa Laboratories COM 59064R109 16,490 3,260 24.64 2,448 48.91 0.1808
2018-02-13 2017-12-31 13F Mesa Laboratories COM 59064R109 13,230 850 6.87 1,644 -11.09 0.1208
2017-11-14 2017-09-30 13F Mesa Laboratories COM 59064R109 12,380 2,260 22.33 1,849 27.52 0.1387
2017-08-14 2017-06-30 13F Mesa Laboratories COM 59064R109 10,120 -4,140 -29.03 1,450 -17.14 0.1034
2017-05-15 2017-03-31 13F Mesa Laboratories COM 59064R109 14,260 1,070 8.11 1,750 8.09 0.1270
2017-02-15 2016-12-31 13F Mesa Laboratories COM 59064R109 13,190 860 6.97 1,619 14.82 0.1149
2016-11-14 2016-09-30 13F Mesa Labs COM 59064R109 12,330 -1,370 -10.00 1,410 -16.32 0.1011
2016-08-12 2016-06-30 13F Mesa Labs COM 59064R109 13,700 560 4.26 1,685 33.10 0.1039
2016-05-16 2016-03-31 13F Mesa Labs COM 59064R109 13,140 -2,160 -14.12 1,266 -16.82 0.0776
2016-02-16 2015-12-31 13F Mesa Labs COM 59064R109 15,300 -620 -3.89 1,522 -14.16 0.0897
2015-11-16 2015-09-30 13F Mesa Labs COM 59064R109 15,920 1,180 8.01 1,773 35.34 0.0999
2015-08-14 2015-06-30 13F Mesa Labs COM 59064R109 14,740 160 1.10 1,310 24.41 0.0638
2015-05-15 2015-03-31 13F Mesa Labs COM 59064R109 14,580 3,090 26.89 1,053 18.58 0.0513
2015-02-13 2014-12-31 13F Mesa Labs COM 59064R109 11,490 3,330 40.81 888 88.54 0.0455
2014-11-14 2014-09-30 13F Mesa Labs COM 59064R109 8,160 8,160 471 0.0249
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.