Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionFuller & Thaler Asset Management, Inc.
Latest Disclosed Ownership242,196 shares
Latest Disclosed Value $ 333,986,407
Fuller & Thaler Asset Management, Inc. reports 16.21% decrease in ownership of FIX / Comfort Systems USA, Inc.

On May 14, 2026 - Fuller & Thaler Asset Management, Inc. filed a 13F-HR form disclosing ownership of 242,196 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $333,986,407 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 18, 2026 disclosing 289,039 shares of Comfort Systems USA, Inc.. This represents a change in shares of -16.21% during the quarter.

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)
2026-05-14 2026-03-31 13F COMFORT SYS USA COM 199908104 242,196 -46,843 -16.21 333,986 23.81 1.1245
2026-02-18 2025-12-31 13F/A-1 Comfort Systems Usa Com 199908104 289,039 -81,584 -22.01 269,757 -11.80 0.9113
2026-02-12 2025-12-31 13F Comfort Systems Usa Com 199908104 289,039 -81,584 269,757
2025-11-13 2025-09-30 13F COMFORT SYS USA COM 199908104 370,623 -162,508 -30.48 305,831 6.98 1.0394
2025-08-14 2025-06-30 13F Comfort Systems Usa Com 199908104 533,131 -112,303 -17.40 285,870 37.41 1.0428
2025-05-13 2025-03-31 13F Comfort Systems Usa Com 199908104 645,434 -3,031 -0.47 208,043 -24.34 0.8080
2025-02-14 2024-12-31 13F Comfort Systems Usa Com 199908104 648,465 -124,408 -16.10 274,988 -8.85 1.0413
2024-11-13 2024-09-30 13F Comfort Systems Usa Com 199908104 772,873 176,027 29.49 301,691 66.21 1.1844
2024-08-09 2024-06-30 13F Comfort Systems Usa Com 199908104 596,846 -9,525 -1.57 181,513 -5.78 0.7772
2024-05-13 2024-03-31 13F Comfort Systems Usa Com 199908104 606,371 -462,846 -43.29 192,650 -12.39 0.8404
2024-02-13 2023-12-31 13F Comfort Systems Usa Com 199908104 1,069,217 425,322 66.05 219,906 100.41 1.1141
2023-11-13 2023-09-30 13F Comfort Systems Usa Com 199908104 643,895 -2,345 -0.36 109,726 3.41 0.6310
2023-08-14 2023-06-30 13F Comfort Systems Usa Com 199908104 646,240 227,328 54.27 106,113 73.54 0.6028
2023-05-15 2023-03-31 13F Comfort Systems Usa Com 199908104 418,912 -3,661 -0.87 61,144 127,283.33 0.3526
2023-02-13 2022-12-31 13F Comfort Systems Usa Com 199908104 422,573 -12,813 -2.94 49 -99.89 0.3087
2022-11-14 2022-09-30 13F Comfort Systems Usa Com 199908104 435,386 -154,076 -26.14 42,376 -13.54 0.3050
2022-08-12 2022-06-30 13F Comfort Systems Usa Com 199908104 589,462 -44,552 -7.03 49,014 -13.15 0.3374
2022-05-13 2022-03-31 13F Comfort Systems Usa Com 199908104 634,014 -1,314 -0.21 56,434 -10.22 0.3349
2022-02-09 2021-12-31 13F Comfort Systems Usa Com 199908104 635,328 24,668 4.04 62,859 44.33 0.3655
2021-11-10 2021-09-30 13F Comfort Systems Usa Com 199908104 610,660 93,697 18.12 43,552 6.92 0.2810
2021-08-13 2021-06-30 13F Comfort Systems Usa Com 199908104 516,963 63,415 13.98 40,732 20.11 0.2642
2021-05-13 2021-03-31 13F Comfort Systems Usa Com 199908104 453,548 -118,137 -20.66 33,912 12.65 0.2382
2021-02-11 2020-12-31 13F Comfort Systems Usa Com 199908104 571,685 -337,161 -37.10 30,105 -35.69 0.2786
2020-11-09 2020-09-30 13F Comfort Systems Usa Com 199908104 908,846 -279,738 -23.54 46,815 -3.34 0.5926
2020-08-13 2020-06-30 13F Comfort Systems Usa Com 199908104 1,188,584 349,526 41.66 48,435 57.93 0.6352
2020-05-06 2020-03-31 13F Comfort Systems Usa Com 199908104 839,058 48,721 6.16 30,668 -22.16 0.5171
2020-02-14 2019-12-31 13F Comfort Systems Usa Com 199908104 790,337 8,898 1.14 39,398 13.99 0.4397
2019-11-13 2019-09-30 13F Comfort Systems Usa Com 199908104 781,439 -77,536 -9.03 34,563 -21.09 0.4094
2019-08-13 2019-06-30 13F Comfort Systems Usa Com 199908104 858,975 184,125 27.28 43,799 23.88 0.5100
2019-05-14 2019-03-31 13F Comfort Systems Usa Com 199908104 674,850 87,766 14.95 35,355 37.87 0.4476
2019-02-14 2018-12-31 13F Comfort Systems Usa Com 199908104 587,084 77,761 15.27 25,644 -10.73 0.3693
2018-11-13 2018-09-30 13F Comfort Systems Usa Com 199908104 509,323 63,498 14.24 28,726 40.68 0.2969
2018-08-07 2018-06-30 13F Comfort Systems Usa Com 199908104 445,825 141,525 46.51 20,419 62.68 0.2209
2018-05-14 2018-03-31 13F Comfort Systems Usa Com 199908104 304,300 61,600 25.38 12,552 18.48 0.1471
2018-02-14 2017-12-31 13F/A-1 Comfort Systems Usa Com 199908104 242,700 123,600 103.78 10,594 149.15 0.1274
2018-02-12 2017-12-31 13F Comfort Systems Usa Com 199908104 242,700 123,600 10,594
2017-11-08 2017-09-30 13F Comfort Systems Usa Com 199908104 119,100 8,100 7.30 4,252 3.25 0.0520
2017-08-11 2017-06-30 13F Comfort Systems Usa Com 199908104 111,000 55,400 99.64 4,118 102.06 0.0539
2017-05-15 2017-03-31 13F Comfort Systems Usa Com 199908104 55,600 22,000 65.48 2,038 82.13 0.0278
2017-02-14 2016-12-31 13F/A-1 Comfort Systems Usa Com 199908104 33,600 28,400 546.15 1,119 636.18 0.0169
2017-02-07 2016-12-31 13F Comfort Systems Usa Com 199908104 33,600 1,119
2016-11-14 2016-09-30 13F Comfort Systems Usa Com 199908104 5,200 5,200 152 0.0025
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.