Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership1,471,879 shares
Latest Disclosed Value $ 2,029,706,422
State Street Corp reports 3.02% increase in ownership of FIX / Comfort Systems USA, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,471,879 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $2,029,706,422 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,428,674 shares of Comfort Systems USA, Inc.. This represents a change in shares of 3.02% 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)
2026-05-15 2026-03-31 13F COMFORT SYS USA COM 199908104 1,471,879 43,205 3.02 2,029,706 52.22 0.0701
2026-02-13 2025-12-31 13F COMFORT SYS USA COM 199908104 1,428,674 375,118 35.60 1,333,367 53.37 0.0447
2025-11-14 2025-09-30 13F COMFORT SYS USA COM 199908104 1,053,556 -20,221 -1.88 869,373 50.99 0.0301
2025-08-14 2025-06-30 13F COMFORT SYS USA COM 199908104 1,073,777 -37,408 -3.37 575,770 60.75 0.0216
2025-05-15 2025-03-31 13F COMFORT SYS USA COM 199908104 1,111,185 7,008 0.63 358,168 -23.51 0.0148
2025-02-14 2024-12-31 13F COMFORT SYS USA COM 199908104 1,104,177 48,616 4.61 468,237 13.64 0.0185
2024-11-14 2024-09-30 13F COMFORT SYS USA COM 199908104 1,055,561 6,496 0.62 412,038 29.15 0.0168
2024-08-14 2024-06-30 13F COMFORT SYS USA COM 199908104 1,049,065 -209,013 -16.61 319,042 -20.18 0.0139
2024-05-15 2024-03-31 13F COMFORT SYS USA COM 199908104 1,258,078 41,933 3.45 399,704 59.80 0.0179
2024-02-14 2023-12-31 13F COMFORT SYS USA COM 199908104 1,216,145 -50,580 -3.99 250,125 15.87 0.0122
2023-11-14 2023-09-30 13F COMFORT SYS USA COM 199908104 1,266,725 25,390 2.05 215,863 5.90 0.0120
2023-08-14 2023-06-30 13F COMFORT SYS USA COM 199908104 1,241,335 18,337 1.50 203,827 14.18 0.0107
2023-05-15 2023-03-31 13F COMFORT SYS USA COM 199908104 1,222,998 39,339 3.32 178,509 31.05 0.0101
2023-05-15 2022-12-31 13F/A-99 COMFORT SYS USA COM 199908104 1,183,659 -17,924 -1.49 136,215 16.47 0.0080
2023-05-15 2022-12-31 13F COMFORT SYS USA COM 199908104 1,183,659 -17,924 136,215 0.0080
2022-11-15 2022-09-30 13F COMFORT SYS USA COM 199908104 1,201,583 18,126 1.53 116,950 18.85 0.0074
2022-08-15 2022-06-30 13F COMFORT SYS USA COM 199908104 1,183,457 13,840 1.18 98,404 -5.48 0.0059
2022-05-16 2022-03-31 13F COMFORT SYS USA COM 199908104 1,169,617 38,414 3.40 104,108 -6.98 0.0051
2022-02-14 2021-12-31 13F COMFORT SYS USA COM 199908104 1,131,203 -5,009 -0.44 111,921 38.11 0.0053
2021-11-15 2021-09-30 13F COMFORT SYS USA COM 199908104 1,136,212 -6,609 -0.58 81,035 -10.00 0.0043
2021-08-16 2021-06-30 13F COMFORT SYS USA COM 199908104 1,142,821 47,033 4.29 90,043 9.90 0.0047
2021-07-09 2021-03-31 13F/A-1 COMFORT SYS USA COM 199908104 1,095,788 8,017 0.74 81,932 43.03 0.0047
2021-05-17 2021-03-31 13F COMFORT SYS USA COM 199908104 1,095,788 8,017 81,932 0.0047
2021-02-16 2020-12-31 13F COMFORT SYS USA COM 199908104 1,087,771 -37,772 -3.36 57,282 -1.20 0.0035
2020-11-10 2020-09-30 13F COMFORT SYS USA COM 199908104 1,125,543 -55,801 -4.72 57,977 20.43 0.0040
2020-08-14 2020-06-30 13F COMFORT SYS USA COM 199908104 1,181,344 45,927 4.04 48,140 16.00 0.0035
2020-06-19 2020-03-31 13F/A-1 COMFORT SYS USA COM 199908104 1,135,417 69,239 6.49 41,499 -21.92 0.0036
2020-05-11 2020-03-31 13F COMFORT SYS USA COM 199908104 1,135,417 69,239 41,499 3,644.4478
2020-02-06 2019-12-31 13F COMFORT SYS USA COM 199908104 1,066,178 4,505 0.42 53,149 13.18 0.0036
2019-11-14 2019-09-30 13F COMFORT SYS USA COM 199908104 1,061,673 -8,130 -0.76 46,958 -13.92 0.0035
2019-08-14 2019-06-30 13F COMFORT SYS USA COM 199908104 1,069,803 27,259 2.61 54,549 -0.13 0.0041
2019-05-15 2019-03-31 13F COMFORT SYS USA COM 199908104 1,042,544 8,290 0.80 54,619 20.90 0.0043
2019-02-12 2018-12-31 13F COMFORT SYS USA COM 199908104 1,034,254 -61,599 -5.62 45,176 -26.91 0.0041
2018-11-09 2018-09-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 1,095,853 50,564 4.84 61,808 29.11 0.0047
2018-08-14 2018-06-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 1,045,289 57,021 5.77 47,873 17.43 0.0040
2018-05-15 2018-03-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 988,268 23,089 2.39 40,766 -3.24 0.0035
2018-02-14 2017-12-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 965,179 25,541 2.72 42,129 25.58 0.0034
2017-11-14 2017-09-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 939,638 9,378 1.01 33,548 -2.81 0.0029
2017-08-14 2017-06-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 930,260 39,200 4.40 34,517 5.68 0.0031
2017-05-15 2017-03-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 891,060 45,139 5.34 32,661 15.93 0.0029
2017-02-09 2016-12-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 845,921 19,484 2.36 28,172 16.32 0.0027
2017-01-13 2016-09-30 13F/A-1 COMFORT SYSTEMS USA Common equity shares 199908104 826,437 15,677 1.93 24,220 -8.29 0.0024
2016-11-14 2016-09-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 826,437 24,220
2016-08-12 2016-06-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 810,760 -15,437 -1.87 26,409 0.60 0.0028
2016-05-20 2016-03-31 13F/A-1 COMFORT SYSTEMS USA Common equity shares 199908104 826,197 28,868 3.62 26,252 15.85 0.0028
2016-05-12 2016-03-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 826,197 26,252
2016-02-16 2015-12-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 797,329 33,033 4.32 22,660 8.76 0.0025
2015-11-16 2015-09-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 764,296 29,316 3.99 20,835 23.55 0.0024
2015-08-13 2015-06-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 734,980 -2,503 -0.34 16,864 8.70 0.0018
2015-05-15 2015-03-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 737,483 4,811 0.66 15,514 23.67 0.0016
2015-02-11 2014-12-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 732,672 -20,612 -2.74 12,545 22.92 0.0012
2014-11-12 2014-09-30 13F/A-1 COMFORT SYSTEMS USA Common equity shares 199908104 753,284 -26,497 -3.40 10,206 -17.16 0.0011
2014-11-10 2014-09-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 753,284 10,206
2014-08-12 2014-06-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 779,781 -18,762 -2.35 12,320 1.23 0.0013
2014-05-15 2014-03-31 13F/A-1 COMFORT SYSTEMS USA Common equity shares 199908104 798,543 -2,330 -0.29 12,170 -21.63 0.0014
2014-05-13 2014-03-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 798,743 12,173
2014-02-06 2013-12-31 13F/A-1 COMFORT SYSTEMS USA Common equity shares 199908104 800,873 -31,531 -3.79 15,529 11.01 0.0017
2014-02-06 2013-12-31 13F COMFORT SYSTEMS USA Common equity shares 199908104 821,861 9,996
2013-11-12 2013-09-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 832,404 -1,442 -0.17 13,989 12.47 0.0017
2013-08-08 2013-06-30 13F COMFORT SYSTEMS USA Common equity shares 199908104 833,846 833,846 12,438 0.0016
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.