Mesa Laboratories, Inc.
US ˙ NasdaqGS ˙ US59064R1095

SecurityMLAB / Mesa Laboratories, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership8,371 shares
Latest Disclosed Value $ 657,333
Sei Investments Co reports 51.51% increase in ownership of MLAB / Mesa Laboratories, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 8,371 shares of Mesa Laboratories, Inc. (US:MLAB) valued at $657,124 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 5,525 shares of Mesa Laboratories, Inc.. This represents a change in shares of 51.51% during the quarter. The current value of the position is $913,527 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)
2026-02-13 2025-12-31 13F MESA LABS COM 59064R109 8,371 2,846 51.51 657 77.57 0.0006
2025-11-13 2025-09-30 13F MESA LABS COM 59064R109 5,525 1,163 26.66 370 -9.76 0.0004
2025-08-14 2025-06-30 13F MESA LABS COM 59064R109 4,362 -1,054 -19.46 411 -36.14 0.0005
2025-05-14 2025-03-31 13F/A-1 MESA LABS COM 59064R109 5,416 5 0.09 643 -9.96 0.0008
2025-05-13 2025-03-31 13F MESA LABS COM 59064R109 5,416 5 695 0.0008
2025-02-11 2024-12-31 13F MESA LABS COM 59064R109 5,411 3,848 246.19 714 251.23 0.0009
2024-11-12 2024-09-30 13F MESA LABS COM 59064R109 1,563 1,563 203 0.0003
2024-05-07 2024-03-31 13F MESA LABS COM 59064R109 0 -2,138 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MESA LABS COM 59064R109 2,138 -4,361 -67.10 224 -67.35 0.0004
2023-11-14 2023-09-30 13F MESA LABS COM 59064R109 6,499 -528 -7.51 683 -24.36 0.0012
2023-08-11 2023-06-30 13F MESA LABS COM 59064R109 7,027 -2,307 -24.72 903 -44.60 0.0016
2023-05-12 2023-03-31 13F MESA LABS COM 59064R109 9,334 2,037 27.92 1,631 34.49 0.0030
2023-02-10 2022-12-31 13F MESA LABS COM 59064R109 7,297 -1,142 -13.53 1,213 2.02 0.0027
2022-11-14 2022-09-30 13F MESA LABS COM 59064R109 8,439 -268 -3.08 1,188 -33.11 0.0027
2022-08-15 2022-06-30 13F MESA LABS COM 59064R109 8,707 3,325 61.78 1,776 29.45 0.0038
2022-05-13 2022-03-31 13F MESA LABS COM 59064R109 5,382 -2,415 -30.97 1,372 -46.36 0.0028
2022-02-14 2021-12-31 13F MESA LABS COM 59064R109 7,797 -763 -8.91 2,558 -1.16 0.0048
2021-11-12 2021-09-30 13F MESA LABS COM 59064R109 8,560 2,260 35.87 2,588 51.52 0.0054
2021-08-06 2021-06-30 13F MESA LABS COM 59064R109 6,300 350 5.88 1,708 17.87 0.0038
2021-05-12 2021-03-31 13F MESA LABS COM 59064R109 5,950 -1,595 -21.14 1,449 -33.01 0.0037
2021-02-08 2020-12-31 13F MESA LABS COM 59064R109 7,545 -54 -0.71 2,163 11.73 0.0056
2020-12-04 2020-09-30 13F/A-1 MESA LABS COM 59064R109 7,599 148 1.99 1,936 19.88 0.0056
2020-11-06 2020-09-30 13F MESA LABS COM 59064R109 7,599 148 1,936 4,661.4576
2020-08-17 2020-06-30 13F/A-1 MESA LABS COM 59064R109 7,451 4,214 130.18 1,615 120.63 0.0050
2020-08-11 2020-06-30 13F MESA LABS COM 59064R109 1,175 -2,062 293 794.7781
2020-05-14 2020-03-31 13F MESA LABS COM 59064R109 3,237 2,062 175.49 732 149.83 0.0027
2020-02-06 2019-12-31 13F MESA LABS COM 59064R109 1,175 1,175 293 0.0009
2017-11-06 2017-09-30 13F MESA LABS COM 59064R109 0 -1 -100.00 0 0.0000
2017-07-31 2017-06-30 13F MESA LABS COM 59064R109 1 1 0 0.0000
2015-05-01 2015-03-31 13F MESA LABS COM 59064R109 0 -13 -100.00 0 -100.00
2015-02-10 2014-12-31 13F MESA LABS COM 59064R109 13 13 1 0.0000
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.