Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership2,577 shares
Latest Disclosed Value $ 3,553,761
Assetmark, Inc reports 2.86% decrease in ownership of FIX / Comfort Systems USA, Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 2,577 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $3,553,761 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 2,653 shares of Comfort Systems USA, Inc.. This represents a change in shares of -2.86% 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)
2026-05-06 2026-03-31 13F COMFORT SYS USA COM 199908104 2,577 -76 -2.86 3,554 43.50 0.0072
2026-01-23 2025-12-31 13F COMFORT SYS USA COM 199908104 2,653 -48 -1.78 2,476 11.13 0.0050
2025-11-06 2025-09-30 13F COMFORT SYS USA COM 199908104 2,701 2,101 350.17 2,229 594.08 0.0048
2025-08-04 2025-06-30 13F COMFORT SYS USA COM 199908104 600 291 94.17 322 224.24 0.0008
2025-05-06 2025-03-31 13F COMFORT SYS USA COM 199908104 309 130 72.63 100 32.00 0.0003
2025-02-06 2024-12-31 13F COMFORT SYS USA COM 199908104 179 7 4.07 76 11.94 0.0002
2024-11-01 2024-09-30 13F COMFORT SYS USA COM 199908104 172 14 8.86 67 39.58 0.0002
2024-08-13 2024-06-30 13F COMFORT SYS USA COM 199908104 158 -42 -21.00 48 -23.81 0.0001
2024-05-07 2024-03-31 13F COMFORT SYS USA COM 199908104 200 -46 -18.70 64 26.00 0.0002
2024-02-09 2023-12-31 13F COMFORT SYS USA COM 199908104 246 3 1.23 51 21.95 0.0002
2023-10-27 2023-09-30 13F COMFORT SYS USA COM 199908104 243 -39 -13.83 41 -10.87 0.0002
2023-08-11 2023-06-30 13F COMFORT SYS USA INC COM COM 199908104 282 0 0.00 46 12.20 0.0002
2023-05-05 2023-03-31 13F COMFORT SYS USA INC COM COM 199908104 282 -9 -3.09 41 24.24 0.0002
2023-02-10 2022-12-31 13F COMFORT SYS USA COM 199908104 291 0 0.00 33 17.86 0.0001
2022-11-01 2022-09-30 13F COMFORT SYS USA COM 199908104 291 -2 -0.68 28 16.67 0.0001
2022-08-03 2022-06-30 13F COMFORT SYS USA INC COM COM 199908104 293 81 38.21 24 26.32 0.0001
2022-05-13 2022-03-31 13F COMFORT SYS USA INC COM COM 199908104 212 -3 -1.40 19 -9.52 0.0001
2022-02-14 2021-12-31 13F COMFORT SYS USA INC COM COM 199908104 215 -6 -2.71 21 31.25 0.0001
2021-11-12 2021-09-30 13F COMFORT SYS USA INC COM COM 199908104 221 3 1.38 16 -5.88 0.0001
2021-08-16 2021-06-30 13F COMFORT SYS USA INC COM COM 199908104 218 -2 -0.91 17 6.25 0.0001
2021-05-14 2021-03-31 13F COMFORT SYS USA COM 199908104 220 10 4.76 16 45.45 0.0001
2021-02-10 2020-12-31 13F COMFORT SYS USA INC COM COM 199908104 210 0 0.00 11 0.00 0.0001
2020-11-13 2020-09-30 13F COMFORT SYS USA INC COM COM 199908104 210 -131 -38.42 11 -21.43 0.0001
2020-08-11 2020-06-30 13F COMFORT SYS USA INC COM COM 199908104 341 -63 -15.59 14 -6.67 0.0001
2020-05-12 2020-03-31 13F COMFORT SYS USA INC COM COM 199908104 404 0 0.00 15 -25.00 0.0001
2020-02-11 2019-12-31 13F COMFORT SYS USA INC COM COM 199908104 404 0 0.00 20 11.11 0.0002
2019-11-13 2019-09-30 13F COMFORT SYS USA INC COM COM 199908104 404 -96 -19.20 18 -30.77 0.0002
2019-08-14 2019-06-30 13F COMFORT SYS USA INC COM COM 199908104 500 0 0.00 26 0.00 0.0002
2019-05-14 2019-03-31 13F COMFORT SYS USA INC COM COM 199908104 500 0 0.00 26 18.18 0.0002
2019-02-13 2018-12-31 13F COMFORT SYS USA INC COM COM 199908104 500 0 0.00 22 -21.43 0.0002
2018-11-13 2018-09-30 13F COMFORT SYS USA INC COM COM 199908104 500 0 0.00 28 21.74 0.0003
2018-08-01 2018-06-30 13F COMFORT SYS USA INC COM COM 199908104 500 0 0.00 23 9.52 0.0002
2018-05-16 2018-03-31 13F COMFORT SYS USA INC COM COM 199908104 500 -57 -10.23 21 -12.50 0.0002
2018-02-13 2017-12-31 13F COMFORT SYS USA INC COM COM 199908104 557 -86 -13.37 24 4.35 0.0002
2017-11-08 2017-09-30 13F COMFORT SYS USA INC COM COM 199908104 643 0 0.00 23 -4.17 0.0003
2017-08-14 2017-06-30 13F COMFORT SYS USA INC COM COM 199908104 643 0 0.00 24 0.00 0.0003
2017-09-15 2017-03-31 13F/A-1 COMFORT SYS USA INC COM COM 199908104 643 237 58.37 24 71.43 0.0003
2017-05-08 2017-03-31 13F COMFORT SYS USA INC COM COM 199908104 643 237 24
2017-09-15 2016-12-31 13F/A-1 COMFORT SYS USA INC COM COM 199908104 406 -320 -44.08 14 -33.33 0.0002
2017-02-14 2016-12-31 13F COMFORT SYS USA INC COM COM 199908104 406 -320 14
2017-09-14 2016-09-30 13F/A-1 COMFORT SYS USA INC COM COM 199908104 726 0 0.00 21 -12.50 0.0003
2016-11-04 2016-09-30 13F COMFORT SYS USA INC COM COM 199908104 726 0 21
2017-09-14 2016-06-30 13F/A-1 COMFORT SYS USA INC COM COM 199908104 726 -1,319 -64.50 24 -63.08 0.0004
2016-08-08 2016-06-30 13F COMFORT SYS USA INC COM COM 199908104 726 -1,319 24
2017-09-14 2016-03-31 13F/A-1 COMFORT SYS USA INC COM COM 199908104 2,045 548 36.61 65 54.76 0.0011
2016-05-13 2016-03-31 13F COMFORT SYS USA INC COM COM 199908104 2,045 548 65
2017-09-14 2015-12-31 13F/A-1 COMFORT SYS USA INC COM COM 199908104 1,497 1,497 42 0.0008
2016-02-12 2015-12-31 13F COMFORT SYS USA INC COM COM 199908104 1,497 1,497 42
2015-11-10 2015-09-30 13F COMFORT SYS USA INC COM COM 199908104 0 0 0 0.0000
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.