Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionUs Bancorp \de\
Latest Disclosed Ownership4,571 shares
Latest Disclosed Value $ 6,303,364
Us Bancorp \de\ reports 2.70% increase in ownership of FIX / Comfort Systems USA, Inc.

On May 14, 2026 - Us Bancorp \de\ filed a 13F-HR form disclosing ownership of 4,571 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $6,303,364 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 4,451 shares of Comfort Systems USA, Inc.. This represents a change in shares of 2.70% 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 4,571 120 2.70 6,303 51.73 0.0024
2026-01-30 2025-12-31 13F COMFORT SYS USA COM 199908104 4,451 621 16.21 4,154 31.46 0.0049
2025-11-12 2025-09-30 13F COMFORT SYS USA COM 199908104 3,830 22 0.58 3,160 54.83 0.0037
2025-07-24 2025-06-30 13F COMFORT SYS USA COM 199908104 3,808 -76 -1.96 2,042 63.15 0.0026
2025-05-08 2025-03-31 13F COMFORT SYS USA COM 199908104 3,884 -7,946 -67.17 1,252 -75.06 0.0017
2025-02-05 2024-12-31 13F COMFORT SYS USA COM 199908104 11,830 495 4.37 5,017 13.38 0.0066
2024-10-28 2024-09-30 13F COMFORT SYS USA COM 199908104 11,335 8,184 259.73 4,425 361.80 0.0057
2024-08-07 2024-06-30 13F COMFORT SYS USA COM 199908104 3,151 -1,074 -25.42 958 -28.61 0.0013
2024-05-08 2024-03-31 13F COMFORT SYS USA COM 199908104 4,225 -3,147 -42.69 1,342 -11.48 0.0019
2024-02-09 2023-12-31 13F COMFORT SYS USA COM 199908104 7,372 -1,411 -16.07 1,516 1.34 0.0022
2023-11-03 2023-09-30 13F COMFORT SYS USA COM 199908104 8,783 -707 -7.45 1,497 -3.98 0.0024
2023-08-10 2023-06-30 13F COMFORT SYS USA COM 199908104 9,490 -7,176 -43.06 1,558 -35.94 0.0025
2023-05-09 2023-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 16,666 -196 -1.16 2,433 25.36 0.0041
2023-02-13 2022-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 16,862 -1,203 -6.66 1,940 10.42 0.0034
2022-10-27 2022-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 18,065 -542 -2.91 1,757 13.65 0.0036
2022-08-01 2022-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 18,607 -1,354 -6.78 1,546 -13.00 0.0030
2022-05-11 2022-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 19,961 -39 -0.20 1,777 -10.21 0.0030
2022-02-11 2021-12-31 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 20,000 53 0.27 1,979 39.07 0.0031
2021-11-10 2021-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 19,947 -3,182 -13.76 1,423 -21.94 0.0027
2021-08-05 2021-06-30 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 23,129 628 2.79 1,823 8.32 0.0034
2021-04-28 2021-03-31 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 22,501 6,298 38.87 1,683 97.07 0.0034
2021-02-04 2020-12-31 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 16,203 1,114 7.38 854 9.91 0.0018
2020-11-10 2020-09-30 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 15,089 7,999 112.82 777 168.86 0.0019
2020-08-07 2020-06-30 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 7,090 1,990 39.02 289 54.55 0.0008
2020-05-13 2020-03-31 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 5,100 3,441 207.41 187 128.05 0.0006
2020-02-04 2019-12-31 13F COMFORT SYSTEMS USA COMMON STOCK 199908104 1,659 328 24.64 82 38.98 0.0002
2019-11-08 2019-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 1,331 649 95.16 59 68.57 0.0002
2019-08-13 2019-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 682 0 0.00 35 -2.78 0.0001
2019-05-08 2019-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 682 -37 -5.15 36 16.13 0.0001
2019-02-13 2018-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 719 -584 -44.82 31 -57.53 0.0001
2018-10-31 2018-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 1,303 -407 -23.80 73 -6.41 0.0002
2018-08-08 2018-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 1,710 321 23.11 78 34.48 0.0002
2018-05-08 2018-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 1,389 -688 -33.12 58 -35.56 0.0002
2018-02-02 2017-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 2,077 193 10.24 90 34.33 0.0003
2017-11-13 2017-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 1,884 100 5.61 67 1.52 0.0002
2017-07-19 2017-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 1,784 396 28.53 66 29.41 0.0002
2017-05-03 2017-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 1,388 -567 -29.00 51 -21.54 0.0002
2017-02-08 2016-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 1,955 -1,853 -48.66 65 -41.96 0.0002
2016-11-04 2016-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 3,808 -45 -1.17 112 -10.40 0.0004
2016-08-10 2016-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 3,853 3,339 649.61 125 681.25 0.0005
2016-05-13 2016-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 514 -206 -28.61 16 -23.81 0.0001
2016-02-10 2015-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 720 -127 -14.99 21 -8.70 0.0001
2015-11-16 2015-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 847 -80 -8.63 23 9.52 0.0001
2015-08-10 2015-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 927 -178 -16.11 21 -8.70 0.0001
2015-05-08 2015-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 1,105 0 0.00 23 21.05 0.0001
2015-02-13 2014-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 1,105 274 32.97 19 72.73 0.0001
2014-11-14 2014-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 831 0 0.00 11 -15.38 0.0000
2014-08-14 2014-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 831 -546 -39.65 13 -38.10 0.0001
2014-05-14 2014-03-31 13F COMFORT SYS USA COMMON STOCK 199908104 1,377 -2,896 -67.77 21 -74.70 0.0001
2014-02-13 2013-12-31 13F COMFORT SYS USA COMMON STOCK 199908104 4,273 -1,521 -26.25 83 -15.31 0.0003
2013-11-07 2013-09-30 13F COMFORT SYS USA COMMON STOCK 199908104 5,794 944 19.46 98 34.25 0.0004
2013-08-09 2013-06-30 13F COMFORT SYS USA COMMON STOCK 199908104 4,850 4,850 73 0.0003
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.