Comfort Systems USA, Inc.
US ˙ NYSE ˙ US1999081045

SecurityFIX / Comfort Systems USA, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership54,154 shares
Latest Disclosed Value $ 50,541,629
Sei Investments Co reports 16.69% increase in ownership of FIX / Comfort Systems USA, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 54,154 shares of Comfort Systems USA, Inc. (US:FIX) valued at $50,541,387 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 46,409 shares of Comfort Systems USA, Inc.. This represents a change in shares of 16.69% during the quarter. The current value of the position is $100,187,066 USD.

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)
2026-02-13 2025-12-31 13F COMFORT SYS USA COM 199908104 54,154 7,745 16.69 50,542 31.97 0.0499
2025-11-13 2025-09-30 13F COMFORT SYS USA COM 199908104 46,409 2,778 6.37 38,296 63.69 0.0412
2025-08-14 2025-06-30 13F COMFORT SYS USA COM 199908104 43,631 16,390 60.17 23,395 166.46 0.0271
2025-05-14 2025-03-31 13F/A-1 COMFORT SYS USA COM 199908104 27,241 1,381 5.34 8,781 -19.93 0.0113
2025-05-13 2025-03-31 13F COMFORT SYS USA COM 199908104 25,792 -68 10,888 0.0118
2025-02-11 2024-12-31 13F COMFORT SYS USA COM 199908104 25,860 -4,956 -16.08 10,966 -8.83 0.0141
2024-11-12 2024-09-30 13F COMFORT SYS USA COM 199908104 30,816 3,514 12.87 12,029 44.88 0.0156
2024-08-13 2024-06-30 13F COMFORT SYS USA COM 199908104 27,302 -246 -0.89 8,303 -5.14 0.0118
2024-05-07 2024-03-31 13F COMFORT SYS USA COM 199908104 27,548 912 3.42 8,753 59.77 0.0128
2024-02-14 2023-12-31 13F COMFORT SYS USA COM 199908104 26,636 -9,297 -25.87 5,478 -10.53 0.0088
2023-11-14 2023-09-30 13F COMFORT SYS USA COM 199908104 35,933 12,479 53.21 6,123 59.00 0.0110
2023-08-11 2023-06-30 13F COMFORT SYS USA COM 199908104 23,454 -25,442 -52.03 3,851 -46.03 0.0067
2023-05-12 2023-03-31 13F COMFORT SYS USA COM 199908104 48,896 1,972 4.20 7,137 32.15 0.0133
2023-02-10 2022-12-31 13F COMFORT SYS USA COM 199908104 46,924 29,409 167.91 5,401 216.90 0.0120
2022-11-14 2022-09-30 13F COMFORT SYS USA COM 199908104 17,515 5,268 43.01 1,704 67.39 0.0038
2022-08-15 2022-06-30 13F COMFORT SYS USA COM 199908104 12,247 4,561 59.34 1,018 48.83 0.0022
2022-05-13 2022-03-31 13F COMFORT SYS USA COM 199908104 7,686 1,847 31.63 684 18.54 0.0014
2022-02-14 2021-12-31 13F COMFORT SYS USA COM 199908104 5,839 -1,785 -23.41 577 6.26 0.0011
2021-11-12 2021-09-30 13F COMFORT SYS USA COM 199908104 7,624 -9,030 -54.22 543 -58.61 0.0011
2021-08-06 2021-06-30 13F COMFORT SYS USA COM 199908104 16,654 -1,668 -9.10 1,312 -4.23 0.0029
2021-05-12 2021-03-31 13F COMFORT SYS USA COM 199908104 18,322 1,312 7.71 1,370 52.90 0.0035
2021-02-08 2020-12-31 13F COMFORT SYS USA COM 199908104 17,010 1,452 9.33 896 11.58 0.0023
2020-12-04 2020-09-30 13F/A-1 COMFORT SYS USA COM 199908104 15,558 -1,868 -10.72 803 12.62 0.0023
2020-11-06 2020-09-30 13F COMFORT SYS USA COM 199908104 15,558 -1,868 803 1,933.4455
2020-08-17 2020-06-30 13F/A-1 COMFORT SYS USA COM 199908104 17,426 1,104 6.76 713 17.85 0.0022
2020-08-11 2020-06-30 13F COMFORT SYS USA COM 199908104 23,608 7,286 1,170 3,173.6873
2020-05-14 2020-03-31 13F COMFORT SYS USA COM 199908104 16,322 -7,882 -32.56 605 -49.79 0.0022
2020-02-06 2019-12-31 13F COMFORT SYS USA COM 199908104 24,204 5,333 28.26 1,205 44.31 0.0036
2019-11-12 2019-09-30 13F COMFORT SYS USA COM 199908104 18,871 12,482 195.37 835 153.03 0.0021
2019-08-14 2019-06-30 13F COMFORT SYS USA COM 199908104 6,389 -9,235 -59.11 330 -59.90 0.0011
2019-05-15 2019-03-31 13F COMFORT SYS USA COM 199908104 15,624 4,210 36.88 823 62.97 0.0028
2019-02-13 2018-12-31 13F COMFORT SYS USA COM 199908104 11,414 5,651 98.06 505 56.35 0.0018
2018-11-08 2018-09-30 13F COMFORT SYS USA COM 199908104 5,763 1,557 37.02 323 68.23 0.0012
2018-08-03 2018-06-30 13F COMFORT SYS USA COM 199908104 4,206 691 19.66 192 32.41 0.0007
2018-05-11 2018-03-31 13F COMFORT SYS USA COM 199908104 3,515 1,260 55.88 145 47.96 0.0006
2018-02-08 2017-12-31 13F COMFORT SYS USA COM 199908104 2,255 -82 -3.51 98 18.07 0.0003
2017-11-06 2017-09-30 13F COMFORT SYS USA COM 199908104 2,337 -12,827 -84.59 83 -85.23 0.0003
2017-07-31 2017-06-30 13F COMFORT SYS USA COM 199908104 15,164 13,729 956.72 562 960.38 0.0022
2017-05-05 2017-03-31 13F COMFORT SYS USA COM 199908104 1,435 510 55.14 53 70.97 0.0002
2017-02-02 2016-12-31 13F COMFORT SYS USA COM 199908104 925 -4 -0.43 31 14.81 0.0002
2016-11-04 2016-09-30 13F COMFORT SYS USA COM 199908104 929 58 6.66 27 -3.57 0.0001
2016-08-11 2016-06-30 13F COMFORT SYS USA COM 199908104 871 -8,732 -90.93 28 -90.85 0.0002
2016-05-10 2016-03-31 13F/A-1 COMFORT SYS USA COM 199908104 9,603 2,433 33.93 306 50.00 0.0019
2016-02-03 2015-12-31 13F COMFORT SYS USA COM 199908104 7,170 3,255 83.14 204 90.65 0.0012
2015-11-02 2015-09-30 13F/A-1 COMFORT SYS USA COM 199908104 3,915 17 0.44 107 18.89 0.0010
2015-10-30 2015-09-30 13F COMFORT SYS USA COM 199908104 3,915 108
2015-08-07 2015-06-30 13F/A-1 COMFORT SYS USA COM 199908104 3,898 3,898 90 0.0008
2015-08-04 2015-06-30 13F COMFORT SYS USA COM 199908104 3,898 3,898 90 0.0008
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.