Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership18,575 shares
Latest Disclosed Value $ 25,618,892
Advisor Group Holdings, Inc. reports 32.19% decrease in ownership of FIX / Comfort Systems USA, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 18,575 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $25,618,892 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 27,391 shares of Comfort Systems USA, Inc.. This represents a change in shares of -32.19% 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 18,575 -8,816 -32.19 25,619 0.20 0.0218
2026-02-17 2025-12-31 13F COMFORT SYS USA COM 199908104 27,391 26 0.10 25,568 14.89 0.0374
2025-11-14 2025-09-30 13F COMFORT SYS USA COM 199908104 27,365 18,992 226.82 22,255 398.08 0.0311
2025-09-04 2025-06-30 13F/A-1 OMFORT SYS USA COM 199908104 8,373 -722 -7.94 4,468 52.39 0.0080
2025-08-13 2025-06-30 13F OMFORT SYS USA COM 199908104 7,371 -1,724 3,730 0.0043
2025-05-12 2025-03-31 13F COMFORT SYS USA COM 199908104 9,095 4,556 100.37 2,932 52.31 0.0065
2025-06-06 2024-12-31 13F/A-1 COMFORT SYS USA COM 199908104 4,539 76 1.70 1,926 10.51 0.0043
2025-02-07 2024-12-31 13F COMFORT SYS USA COM 199908104 4,333 -130 1,784 0.0046
2024-11-13 2024-09-30 13F COMFORT SYS USA COM 199908104 4,463 816 22.37 1,742 57.08 0.0039
2024-08-13 2024-06-30 13F COMFORT SYS USA COM 199908104 3,647 -820 -18.36 1,109 -21.85 0.0026
2024-05-10 2024-03-31 13F COMFORT SYS USA COM 199908104 4,467 -6,833 -60.47 1,419 -38.94 0.0032
2024-02-12 2023-12-31 13F COMFORT SYS USA COM 199908104 11,300 -552 -4.66 2,324 15.05 0.0041
2023-11-13 2023-09-30 13F COMFORT SYS USA COM 199908104 11,852 -2,783 -19.02 2,020 -15.94 0.0030
2023-08-21 2023-06-30 13F/A-1 COMFORT SYS USA COM 199908104 14,635 2,169 17.40 2,403 32.11 0.0043
2023-08-10 2023-06-30 13F COMFORT SYS USA COM 199908104 14,635 2,169 2,403 0.0007
2023-05-12 2023-03-31 13F COMFORT SYS USA COM 199908104 12,466 941 8.16 1,819 37.28 0.0034
2023-02-10 2022-12-31 13F COMFORT SYS USA COM 199908104 11,525 4,197 57.27 1,325 85.83 0.0027
2022-11-14 2022-09-30 13F COMFORT SYS USA COM 199908104 7,328 727 11.01 713 29.87 0.0016
2022-08-10 2022-06-30 13F COMFORT SYS USA COM 199908104 6,601 -502 -7.07 549 -66.99 0.0012
2022-05-04 2022-03-31 13F COMFORT SYS USA COM 199908104 7,103 -395 -5.27 1,663 124.12 0.0032
2022-02-03 2021-12-31 13F COMFORT SYS USA COM 199908104 7,498 -1,879 -20.04 742 10.91 0.0014
2021-11-05 2021-09-30 13F COMFORT SYS USA COM 199908104 9,377 -1,445 -13.35 669 -21.48 0.0014
2021-08-02 2021-06-30 13F COMFORT SYS USA COM 199908104 10,822 3,460 47.00 852 54.91 0.0018
2021-05-13 2021-03-31 13F COMFORT SYS USA COM 199908104 7,362 -4,799 -39.46 550 -14.06 0.0013
2021-02-10 2020-12-31 13F COMFORT SYS USA COM 199908104 12,161 -909 -6.95 640 -4.48 0.0017
2020-11-12 2020-09-30 13F COMFORT SYS USA COM 199908104 13,070 7,488 134.15 670 192.58 0.0020
2020-08-14 2020-06-30 13F COMFORT SYS USA COM 199908104 5,582 -5,590 -50.04 229 -43.87 0.0008
2020-05-18 2020-03-31 13F COMFORT SYS USA COM 199908104 11,172 11,172 408 0.0017
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.