Mesa Laboratories, Inc.
US ˙ NasdaqGS ˙ US59064R1095

SecurityMLAB / Mesa Laboratories, Inc.
InstitutionStifel Financial Corp
Latest Disclosed Ownership11,363 shares
Latest Disclosed Value $ 1,004,717
Stifel Financial Corp reports 0.78% increase in ownership of MLAB / Mesa Laboratories, Inc.

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 11,363 shares of Mesa Laboratories, Inc. (US:MLAB) valued at $1,004,716 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 11,275 shares of Mesa Laboratories, Inc.. This represents a change in shares of 0.78% during the quarter. The current value of the position is $1,240,044 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)
2026-05-12 2026-03-31 13F MESA LABS COM 59064R109 11,363 88 0.78 1,005 13.45 0.0002
2026-02-13 2025-12-31 13F MESA LABS COM 59064R109 11,275 1,170 11.58 885 30.72 0.0008
2025-11-12 2025-09-30 13F MESA LABS COM 59064R109 10,105 1,813 21.86 677 -13.32 0.0006
2025-08-14 2025-06-30 13F MESA LABS COM 59064R109 8,292 4,902 144.60 781 94.28 0.0008
2025-05-14 2025-03-31 13F MESA LABS COM 59064R109 3,390 99 3.01 402 -7.16 0.0004
2025-02-13 2024-12-31 13F MESA LABS COM 59064R109 3,291 39 1.20 434 2.61 0.0005
2024-11-14 2024-09-30 13F MESA LABS COM 59064R109 3,252 -655 -16.76 422 24.48 0.0004
2024-08-13 2024-06-30 13F MESA LABS COM 59064R109 3,907 -213 -5.17 339 -25.00 0.0004
2024-05-14 2024-03-31 13F MESA LABS COM 59064R109 4,120 -1,729 -29.56 452 -26.14 0.0005
2024-02-12 2023-12-31 13F MESA LABS COM 59064R109 5,849 -600 -9.30 613 -9.60 0.0008
2023-11-13 2023-09-30 13F MESA LABS COM 59064R109 6,449 32 0.50 678 -17.84 0.0010
2023-08-14 2023-06-30 13F MESA LABS COM 59064R109 6,417 77 1.21 825 -25.56 0.0011
2023-05-12 2023-03-31 13F MESA LABS COM 59064R109 6,340 298 4.93 1,108 10.26 0.0016
2023-02-13 2022-12-31 13F MESA LABS COM 59064R109 6,042 -199 -3.19 1,004 14.22 0.0015
2022-11-14 2022-09-30 13F MESA LABS COM 59064R109 6,241 -97 -1.53 879 -32.02 0.0014
2022-08-15 2022-06-30 13F MESA LABS COM 59064R109 6,338 273 4.50 1,293 -16.36 0.0020
2022-05-13 2022-03-31 13F MESA LABS COM 59064R109 6,065 3,025 99.51 1,546 55.07 0.0021
2022-02-14 2021-12-31 13F MESA LABS COM 59064R109 3,040 -1,019 -25.10 997 -18.74 0.0013
2021-11-15 2021-09-30 13F MESA LABS COM 59064R109 4,059 68 1.70 1,227 13.40 0.0018
2021-08-13 2021-06-30 13F MESA LABS COM 59064R109 3,991 63 1.60 1,082 13.18 0.0016
2021-05-14 2021-03-31 13F MESA LABS COM 59064R109 3,928 46 1.18 956 -14.11 0.0016
2021-02-12 2020-12-31 13F MESA LABS COM 59064R109 3,882 -68 -1.72 1,113 10.64 0.0020
2020-11-16 2020-09-30 13F MESA LABS COM 59064R109 3,950 -942 -19.26 1,006 -5.18 0.0021
2020-08-14 2020-06-30 13F MESA LABS COM 59064R109 4,892 -838 -14.62 1,061 -18.01 0.0024
2020-05-14 2020-03-31 13F MESA LABS COM 59064R109 5,730 -13 -0.23 1,294 -9.64 0.0036
2020-02-13 2019-12-31 13F MESA LABS COM 59064R109 5,743 4 0.07 1,432 4.91 0.0030
2019-11-19 2019-09-30 13F/A-1 MESA LABS COM 59064R109 5,739 0 0.00 1,365 -2.78 0.0035
2019-11-13 2019-09-30 13F MESA LABS COM 59064R109 5,739 0 1,365 765.1509
2019-08-14 2019-06-30 13F MESA LABS COM 59064R109 5,739 -113 -1.93 1,404 4.08 0.0036
2019-05-14 2019-03-31 13F MESA LABS COM 59064R109 5,852 -387 -6.20 1,349 3.69 0.0038
2019-02-13 2018-12-31 13F MESA LABS COM 59064R109 6,239 0 0.00 1,301 12.35 0.0042
2018-11-13 2018-09-30 13F MESA LABS COM 59064R109 6,239 -2 -0.03 1,158 -12.21 0.0033
2018-08-14 2018-06-30 13F MESA LABS COM 59064R109 6,241 -566 -8.31 1,319 30.46 0.0040
2018-05-11 2018-03-31 13F MESA LABS COM 59064R109 6,807 6,807 1,011 0.0032
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.