Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership148,961 shares
Latest Disclosed Value $ 139,023,812
Alliancebernstein L.p. reports 18.51% decrease in ownership of FIX / Comfort Systems USA, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 148,961 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $139,023,812 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 182,807 shares of Comfort Systems USA, Inc.. This represents a change in shares of -18.51% 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.

Upgrade to unlock premium data and export to Excel .

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 148,961 -33,846 -18.51 139,024 -18.51 0.0450
2026-02-17 2025-12-31 13F COMFORT SYS USA COM 199908104 182,807 -28,346 -13.42 170,612 -2.08 0.0539
2025-11-14 2025-09-30 13F COMFORT SYS USA COM 199908104 211,153 -60,230 -22.19 174,239 19.74 0.0549
2025-08-14 2025-06-30 13F COMFORT SYS USA COM 199908104 271,383 -24,361 -8.24 145,518 52.65 0.0475
2025-05-15 2025-03-31 13F COMFORT SYS USA COM 199908104 295,744 -10,000 -3.27 95,327 -26.48 0.0345
2025-02-12 2024-12-31 13F COMFORT SYS USA COM 199908104 305,744 -239,040 -43.88 129,654 -39.03 0.0440
2024-11-14 2024-09-30 13F COMFORT SYS USA COM 199908104 544,784 -54,714 -9.13 212,656 16.64 0.0714
2024-08-14 2024-06-30 13F COMFORT SYS USA COM 199908104 599,498 83,228 16.12 182,319 11.15 0.0636
2024-05-14 2024-03-31 13F COMFORT SYS USA COM 199908104 516,270 -93,629 -15.35 164,024 30.76 0.0580
2024-02-14 2023-12-31 13F COMFORT SYS USA COM 199908104 609,899 -102,289 -14.36 125,438 3.36 0.0483
2023-11-14 2023-09-30 13F COMFORT SYS USA COM 199908104 712,188 -36,342 -4.86 121,364 -1.26 0.0516
2023-08-15 2023-06-30 13F COMFORT SYS USA COM 199908104 748,530 -58,083 -7.20 122,909 4.40 0.0502
2023-05-15 2023-03-31 13F COMFORT SYS USA COM 199908104 806,613 272,197 50.93 117,733 91.44 0.0504
2023-02-15 2022-12-31 13F COMFORT SYS USA COM 199908104 534,416 431,146 417.49 61,501 511.88 0.0277
2022-11-15 2022-09-30 13F COMFORT SYS USA COM 199908104 103,270 3,717 3.73 10,051 21.42 0.0049
2022-08-15 2022-06-30 13F COMFORT SYS USA COM 199908104 99,553 -1,102 -1.09 8,278 -7.60 0.0038
2022-05-13 2022-03-31 13F COMFORT SYS USA COM 199908104 100,655 1,903 1.93 8,959 -8.31 0.0035
2022-02-14 2021-12-31 13F COMFORT SYS USA COM 199908104 98,752 -21,087 -17.60 9,771 14.32 0.0035
2021-11-10 2021-09-30 13F COMFORT SYS USA COM 199908104 119,839 -2,089 -1.71 8,547 -11.03 0.0034
2021-07-30 2021-06-30 13F COMFORT SYS USA COM 199908104 121,928 -9,738 -7.40 9,607 -2.42 0.0039
2021-05-06 2021-03-31 13F COMFORT SYS USA COM 199908104 131,666 5,867 4.66 9,845 48.60 0.0043
2021-02-08 2020-12-31 13F COMFORT SYS USA COM 199908104 125,799 -644 -0.51 6,625 1.72 0.0031
2020-11-12 2020-09-30 13F COMFORT SYS USA COM 199908104 126,443 5,087 4.19 6,513 31.71 0.0035
2020-08-13 2020-06-30 13F COMFORT SYS USA COM 199908104 121,356 2,988 2.52 4,945 14.31 0.0029
2020-05-14 2020-03-31 13F COMFORT SYS USA COM 199908104 118,368 50 0.04 4,326 -26.65 0.0031
2020-02-18 2019-12-31 13F COMFORT SYS USA COM 199908104 118,318 200 0.17 5,898 12.90 0.0034
2019-11-14 2019-09-30 13F COMFORT SYS USA COM 199908104 118,118 -7,360 -5.87 5,224 -18.35 0.0033
2019-08-14 2019-06-30 13F COMFORT SYS USA COM 199908104 125,478 14,997 13.57 6,398 10.54 0.0040
2019-05-14 2019-03-31 13F COMFORT SYS USA COM 199908104 110,481 11,824 11.98 5,788 34.32 0.0038
2019-02-13 2018-12-31 13F COMFORT SYS USA COM 199908104 98,657 0 0.00 4,309 -22.56 0.0032
2018-11-08 2018-09-30 13F COMFORT SYS USA COM 199908104 98,657 0 0.00 5,564 23.15 0.0036
2018-08-13 2018-06-30 13F COMFORT SYS USA COM 199908104 98,657 13,870 16.36 4,518 29.20 0.0031
2018-05-14 2018-03-31 13F COMFORT SYS USA COM 199908104 84,787 -1,000 -1.17 3,497 -6.62 0.0025
2018-02-13 2017-12-31 13F COMFORT SYS USA COM 199908104 85,787 -6,310 -6.85 3,745 13.90 0.0027
2017-11-13 2017-09-30 13F COMFORT SYS USA COM 199908104 92,097 14,480 18.66 3,288 14.17 0.0025
2017-08-10 2017-06-30 13F COMFORT SYS USA COM 199908104 77,617 26,190 50.93 2,880 52.79 0.0022
2017-05-11 2017-03-31 13F COMFORT SYS USA COM 199908104 51,427 -55,410 -51.86 1,885 -47.02 0.0015
2017-02-13 2016-12-31 13F COMFORT SYS USA COM 199908104 106,837 -12,840 -10.73 3,558 1.43 0.0030
2016-11-10 2016-09-30 13F COMFORT SYS USA COM 199908104 119,677 26,060 27.84 3,508 15.05 0.0030
2016-08-11 2016-06-30 13F COMFORT SYS USA COM 199908104 93,617 28,650 44.10 3,049 47.72 0.0026
2016-05-13 2016-03-31 13F COMFORT SYS USA COM 199908104 64,967 13,940 27.32 2,064 42.34 0.0018
2016-02-16 2015-12-31 13F/A-1 COMFORT SYS USA COM 199908104 51,027 -700 -1.35 1,450 2.84 0.0012
2016-02-12 2015-12-31 13F COMFORT SYS USA COM 199908104 51,027 1,391
2015-11-13 2015-09-30 13F COMFORT SYS USA COM 199908104 51,727 -10,000 -16.20 1,410 -0.49 0.0012
2015-08-14 2015-06-30 13F COMFORT SYS USA COM 199908104 61,727 0 0.00 1,417 9.08 0.0012
2015-05-13 2015-03-31 13F COMFORT SYSTEMS USA COM 199908104 61,727 0 0.00 1,299 22.89 0.0011
2015-02-13 2014-12-31 13F COMFORT SYSTEMS USA COM 199908104 61,727 0 0.00 1,057 26.44 0.0009
2014-11-13 2014-09-30 13F COMFORT SYSTEMS USA COM 199908104 61,727 0 0.00 836 -14.26 0.0007
2014-08-13 2014-06-30 13F COMFORT SYSTEMS USA COM 199908104 61,727 -3 -0.00 975 3.61 0.0008
2014-05-13 2014-03-31 13F COMFORT SYSTEMS USA COM 199908104 61,730 0 0.00 941 -21.39 0.0008
2014-02-13 2013-12-31 13F COMFORT SYSTEMS USA COM 199908104 61,730 0 0.00 1,197 15.32 0.0011
2013-11-14 2013-09-30 13F COMFORT SYSTEMS USA COM 199908104 61,730 3 0.00 1,038 12.70 0.0010
2013-08-13 2013-06-30 13F COMFORT SYSTEMS USA COM 199908104 61,727 61,727 921 0.0010
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.