Mesa Laboratories, Inc.
US ˙ NasdaqGS ˙ US59064R1095

SecurityMLAB / Mesa Laboratories, Inc.
InstitutionRoyce Micro-cap Trust, Inc /md/
Latest Disclosed Ownership33,253 shares
Latest Disclosed Value $ 3,133,097
Royce Micro-cap Trust, Inc /md/ reports 33.74% decrease in ownership of MLAB / Mesa Laboratories, Inc.

On August 15, 2025 - Royce Micro-cap Trust, Inc /md/ filed a NPORT-P form disclosing ownership of 33,253 shares of Mesa Laboratories, Inc. (US:MLAB) valued at $3,133,098 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 19, 2025 disclosing 50,183 shares of Mesa Laboratories, Inc.. This represents a change in shares of -33.74% during the quarter. The current value of the position is $3,454,654 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)
2025-08-15 2025-06-30 NP Mesa Laboratories EC US59064R1095 33,253 -16,930 -33.74 3,133 -47.38 0.5641
2025-05-19 2025-03-31 NP Mesa Laboratories EC US59064R1095 50,183 -10,000 -16.62 5,955 -24.97 1.2196
2025-02-21 2024-12-31 NP Mesa Laboratories EC US59064R1095 60,183 -43,949 -42.21 7,936 -41.31 1.4002
2024-11-19 2024-09-30 NP Mesa Laboratories EC US59064R1095 104,132 -11,833 -10.20 13,523 34.39 2.4392
2024-08-12 2024-06-30 NP Mesa Laboratories EC US59064R1095 115,965 21,950 23.35 10,062 -2.46 1.8795
2024-05-28 2024-03-31 NP Mesa Laboratories EC US59064R1095 94,015 5,846 6.63 10,316 11.68 1.9121
2024-02-20 2023-12-31 NP Mesa Laboratories EC US59064R1095 88,169 27,074 44.31 9,237 43.90 1.7747
2023-11-22 2023-09-30 NP Mesa Laboratories EC US59064R1095 61,095 271 0.45 6,419 -17.86 1.3707
2023-08-09 2023-06-30 NP Mesa Laboratories EC US59064R1095 60,824 1,145 1.92 7,816 -25.05 1.6077
2023-05-19 2023-03-31 NP Mesa Laboratories EC US59064R1095 59,679 100 0.17 10,428 5.30 2.2039
2023-02-21 2022-12-31 NP Mesa Laboratories EC US59064R1095 59,579 7,800 15.06 9,903 35.79 2.1250
2022-11-17 2022-09-30 NP Mesa Laboratories EC US59064R1095 51,779 2,060 4.14 7,292 -28.08 1.7283
2022-08-16 2022-06-30 NP Mesa Laboratories EC US59064R1095 49,719 -4,961 -9.07 10,140 -27.25 2.3195
2022-05-16 2022-03-31 NP Mesa Laboratories EC US59064R1095 54,680 50 0.09 13,937 -22.25 2.5802
2022-02-24 2021-12-31 NP Mesa Laboratories EC US59064R1095 54,630 1,630 3.08 17,924 11.84 3.0362
2021-11-22 2021-09-30 NP Mesa Laboratories EC US59064R1095 53,000 1,000 1.92 16,025 13.65 2.7616
2021-08-24 2021-06-30 NP Mesa Laboratories EC US59064R1095 52,000 0 0.00 14,101 11.36 2.2942
2021-05-17 2021-03-31 NP Mesa Laboratories EC US59064R1095 52,000 0 0.00 12,662 -15.05 2.2186
2021-02-19 2020-12-31 NP Mesa Laboratories EC US59064R1095 52,000 0 0.00 14,905 12.52 2.8891
2020-11-24 2020-09-30 NP Mesa Laboratories EC US59064R1095 52,000 0 0.00 13,248 17.51 3.2966
2020-08-19 2020-06-30 NP Mesa Laboratories EC US59064R1095 52,000 0 0.00 11,274 -4.11 3.0570
2020-05-27 2020-03-31 NP Mesa Laboratories EC US59064R1095 52,000 0 0.00 11,757 -9.35 4.1711
2020-02-19 2019-12-31 NP Mesa Laboratories EC 59064R109 52,000 0 0.00 12,969 4.89 3.2034
2019-11-25 2019-09-30 NP Mesa Laboratories EC US59064R1095 52,000 52,000 12,364 3.3107
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.