Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionAqr Capital Management Llc
ManagerCliff Asness
Latest Disclosed Ownership1,116,230 shares
Latest Disclosed Value $ 1,490,100,586
Aqr Capital Management Llc reports 9.44% increase in ownership of FIX / Comfort Systems USA, Inc.

On May 15, 2026 - Aqr Capital Management Llc filed a 13F-HR form disclosing ownership of 1,116,230 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $1,490,100,586 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,019,922 shares of Comfort Systems USA, Inc.. This represents a change in shares of 9.44% 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 1,116,230 96,308 9.44 1,490,101 56.54 0.6824
2026-02-17 2025-12-31 13F COMFORT SYS USA COM 199908104 1,019,922 184,362 22.06 951,883 40.30 0.4993
2025-11-14 2025-09-30 13F COMFORT SYS USA COM 199908104 835,560 53,125 6.79 678,475 61.91 0.4349
2025-08-14 2025-06-30 13F COMFORT SYS USA COM 199908104 782,435 252,007 47.51 419,049 153.62 0.3467
2025-05-15 2025-03-31 13F COMFORT SYS USA COM 199908104 530,428 273,453 106.41 165,228 51.62 0.1702
2025-02-14 2024-12-31 13F COMFORT SYS USA COM 199908104 256,975 51,702 25.19 108,973 36.71 0.1404
2024-11-14 2024-09-30 13F COMFORT SYS USA COM 199908104 205,273 62,733 44.01 79,710 83.88 0.1100
2024-08-14 2024-06-30 13F COMFORT SYS USA COM 199908104 142,540 66,703 87.96 43,349 79.92 0.0664
2024-05-15 2024-03-31 13F COMFORT SYS USA COM 199908104 75,837 46,577 159.18 24,094 300.43 0.0410
2024-02-14 2023-12-31 13F COMFORT SYS USA COM 199908104 29,260 -3,260 -10.02 6,018 8.59 0.0113
2023-11-14 2023-09-30 13F COMFORT SYS USA COM 199908104 32,520 2,224 7.34 5,542 11.40 0.0114
2023-08-14 2023-06-30 13F COMFORT SYS USA COM 199908104 30,296 1,009 3.45 4,975 16.38 0.0106
2023-05-15 2023-03-31 13F COMFORT SYS USA COM 199908104 29,287 16,410 127.44 4,275 188.59 0.0094
2023-02-14 2022-12-31 13F COMFORT SYS USA COM 199908104 12,877 -343 -2.59 1,482 15.07 0.0034
2022-11-14 2022-09-30 13F COMFORT SYS USA COM 199908104 13,220 19 0.14 1,287 17.21 0.0031
2022-08-15 2022-06-30 13F COMFORT SYS USA COM 199908104 13,201 -409 -3.01 1,098 -9.33 0.0025
2022-05-16 2022-03-31 13F COMFORT SYS USA COM 199908104 13,610 1,832 15.55 1,211 3.95 0.0023
2022-02-14 2021-12-31 13F COMFORT SYS USA COM 199908104 11,778 -5,898 -33.37 1,165 -7.61 0.0021
2021-11-15 2021-09-30 13F COMFORT SYS USA COM 199908104 17,676 -4,814 -21.41 1,261 -28.84 0.0023
2021-08-16 2021-06-30 13F COMFORT SYS USA COM 199908104 22,490 2,201 10.85 1,772 16.81 0.0031
2021-05-17 2021-03-31 13F COMFORT SYS USA COM 199908104 20,289 -34,387 -62.89 1,517 -47.31 0.0025
2021-02-16 2020-12-31 13F COMFORT SYS USA COM 199908104 54,676 9,568 21.21 2,879 23.88 0.0051
2020-11-16 2020-09-30 13F COMFORT SYS USA COM 199908104 45,108 -30,543 -40.37 2,324 -24.62 0.0039
2020-08-17 2020-06-30 13F COMFORT SYS USA COM 199908104 75,651 -16,286 -17.71 3,083 -8.24 0.0050
2020-05-15 2020-03-31 13F COMFORT SYS USA COM 199908104 91,937 -13,694 -12.96 3,360 -36.19 0.0057
2020-02-14 2019-12-31 13F COMFORT SYS USA COM 199908104 105,631 -42,165 -28.53 5,266 -19.44 0.0060
2019-11-14 2019-09-30 13F COMFORT SYS USA COM 199908104 147,796 29,198 24.62 6,537 8.10 0.0077
2019-08-14 2019-06-30 13F COMFORT SYS USA COM 199908104 118,598 -4,579 -3.72 6,047 -6.29 0.0067
2019-05-14 2019-03-31 13F COMFORT SYS USA COM 199908104 123,177 -70,733 -36.48 6,453 -23.81 0.0068
2019-02-14 2018-12-31 13F COMFORT SYS USA COM 199908104 193,910 -18,126 -8.55 8,470 -29.17 0.0098
2018-11-15 2018-09-30 13F/A-1 COMFORT SYS USA COM 199908104 212,036 5,968 2.90 11,959 26.71 0.0114
2018-11-14 2018-09-30 13F COMFORT SYS USA COM 199908104 206,068 0 9,438
2018-08-14 2018-06-30 13F COMFORT SYS USA COM 199908104 206,068 -9,744 -4.52 9,438 6.02 0.0095
2018-05-15 2018-03-31 13F COMFORT SYS USA COM 199908104 215,812 5,512 2.62 8,902 -3.03 0.0096
2018-02-14 2017-12-31 13F COMFORT SYS USA COM 199908104 210,300 2,545 1.23 9,180 23.77 0.0096
2017-11-14 2017-09-30 13F COMFORT SYS USA COM 199908104 207,755 -16,538 -7.37 7,417 -10.86 0.0089
2017-08-14 2017-06-30 13F COMFORT SYS USA COM 199908104 224,293 6,201 2.84 8,321 4.10 0.0110
2017-05-15 2017-03-31 13F COMFORT SYS USA COM 199908104 218,092 -49,778 -18.58 7,993 -10.39 0.0106
2017-02-14 2016-12-31 13F COMFORT SYS USA COM 199908104 267,870 -24,948 -8.52 8,920 3.94 0.0123
2016-11-14 2016-09-30 13F COMFORT SYS USA COM 199908104 292,818 -31,972 -9.84 8,582 -18.87 0.0131
2016-08-15 2016-06-30 13F COMFORT SYS USA COM 199908104 324,790 8,073 2.55 10,578 5.13 0.0187
2016-07-29 2016-03-31 13F/A-1 COMFORT SYS USA COM 199908104 316,717 56,703 21.81 10,062 36.16 0.0181
2016-05-16 2016-03-31 13F COMFORT SYS USA COM 199908104 283,447 9,005
2016-02-16 2015-12-31 13F COMFORT SYS USA COM 199908104 260,014 37,695 16.96 7,390 21.93 0.0129
2015-11-16 2015-09-30 13F COMFORT SYS USA COM 199908104 222,319 201,811 984.06 6,061 1,186.84 0.0121
2015-08-14 2015-06-30 13F COMFORT SYS USA COM 199908104 20,508 20,508 0.00 471 0.0009
2015-02-17 2014-12-31 13F COMFORT SYS USA COM 199908104 0 -47,340 -100.00 0 -100.00
2014-11-14 2014-09-30 13F COMFORT SYS USA COM 199908104 47,340 -7,300 -13.36 641 -25.72 0.0018
2014-08-14 2014-06-30 13F COMFORT SYS USA COM 199908104 54,640 400 0.74 863 4.35 0.0023
2014-05-15 2014-03-31 13F COMFORT SYS USA COM 199908104 54,240 21,375 65.04 827 173.84 0.0025
2014-02-14 2013-12-31 13F COMFORT SYS USA COM 199908104 32,865 0 0.00 302 0.00 0.0009
2013-11-14 2013-09-30 13F COMFORT SYS USA COM 199908104 32,865 0 0.00 302 0.00 0.0011
2013-08-14 2013-06-30 13F COMFORT SYS USA COM 199908104 32,865 -11,400 -25.75 302 -43.87 0.0011
2013-05-29 2012-12-31 13F/A-1 COMFORT SYS USA COM 199908104 44,265 44,265 538 0.0023
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.