Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionSwiss National Bank
Latest Disclosed Ownership103,480 shares
Latest Disclosed Value $ 142,697,885
Swiss National Bank reports 7.03% increase in ownership of FIX / Comfort Systems USA, Inc.

On May 7, 2026 - Swiss National Bank filed a 13F-HR form disclosing ownership of 103,480 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $142,697,885 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 96,680 shares of Comfort Systems USA, Inc.. This represents a change in shares of 7.03% 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)
2026-05-07 2026-03-31 13F COMFORT SYS USA COM 199908104 103,480 6,800 7.03 142,698 58.15 0.0821
2026-02-12 2025-12-31 13F COMFORT SYS USA COM 199908104 96,680 27,780 40.32 90,230 58.70 0.0537
2025-11-13 2025-09-30 13F COMFORT SYS USA COM 199908104 68,900 1,400 2.07 56,855 57.08 0.0330
2025-08-12 2025-06-30 13F COMFORT SYS USA COM 199908104 67,500 -1,500 -2.17 36,194 62.74 0.0217
2025-05-12 2025-03-31 13F COMFORT SYS USA COM 199908104 69,000 -1,100 -1.57 22,241 -25.18 0.0157
2025-02-10 2024-12-31 13F COMFORT SYS USA COM 199908104 70,100 400 0.57 29,727 9.26 0.0198
2024-11-07 2024-09-30 13F COMFORT SYS USA COM 199908104 69,700 -500 -0.71 27,207 27.44 0.0177
2024-08-08 2024-06-30 13F COMFORT SYS USA COM 199908104 70,200 -300 -0.43 21,349 -4.68 0.0147
2024-05-07 2024-03-31 13F COMFORT SYS USA COM 199908104 70,500 0 0.00 22,399 54.48 0.0157
2024-02-06 2023-12-31 13F COMFORT SYS USA COM 199908104 70,500 -8,200 -10.42 14,500 8.11 0.0106
2023-11-08 2023-09-30 13F COMFORT SYS USA COM 199908104 78,700 900 1.16 13,411 4.99 0.0105
2023-08-09 2023-06-30 13F COMFORT SYS USA COM 199908104 77,800 600 0.78 12,775 13.37 0.0087
2023-05-10 2023-03-31 13F COMFORT SYS USA COM 199908104 77,200 -9,100 -10.54 11,268 13.46 0.0077
2023-02-08 2022-12-31 13F COMFORT SYS USA COM 199908104 86,300 1,000 1.17 9,931 19.62 0.0071
2022-11-09 2022-09-30 13F COMFORT SYS USA COM 199908104 85,300 600 0.71 8,302 17.88 0.0059
2022-08-09 2022-06-30 13F COMFORT SYS USA COM 199908104 84,700 -500 -0.59 7,043 -7.13 0.0048
2022-05-09 2022-03-31 13F COMFORT SYS USA COM 199908104 85,200 5,000 6.23 7,584 -4.42 0.0043
2022-02-08 2021-12-31 13F COMFORT SYS USA COM 199908104 80,200 0 0.00 7,935 38.72 0.0048
2021-11-08 2021-09-30 13F COMFORT SYS USA COM 199908104 80,200 400 0.50 5,720 -9.02 0.0036
2021-08-06 2021-06-30 13F COMFORT SYS USA COM 199908104 79,800 -3,400 -4.09 6,287 1.06 0.0039
2021-05-07 2021-03-31 13F COMFORT SYS USA COM 199908104 83,200 500 0.60 6,221 42.85 0.0041
2021-02-05 2020-12-31 13F COMFORT SYS USA COM 199908104 82,700 0 0.00 4,355 2.23 0.0031
2020-11-09 2020-09-30 13F COMFORT SYS USA COM 199908104 82,700 900 1.10 4,260 27.81 0.0033
2020-08-05 2020-06-30 13F COMFORT SYS USA COM 199908104 81,800 10,700 15.05 3,333 28.24 0.0028
2020-05-08 2020-03-31 13F COMFORT SYS USA COM 199908104 71,100 500 0.71 2,599 -26.14 0.0028
2020-02-06 2019-12-31 13F COMFORT SYS USA COM 199908104 70,600 1,400 2.02 3,519 14.96 0.0036
2019-11-12 2019-09-30 13F COMFORT SYS USA COM 199908104 69,200 600 0.87 3,061 -12.49 0.0033
2019-08-02 2019-06-30 13F COMFORT SYS USA COM 199908104 68,600 900 1.33 3,498 -1.38 0.0038
2019-05-10 2019-03-31 13F COMFORT SYS USA COM 199908104 67,700 1,800 2.73 3,547 23.20 0.0039
2019-02-13 2018-12-31 13F COMFORT SYS USA COM 199908104 65,900 1,100 1.70 2,879 -21.23 0.0037
2018-11-08 2018-09-30 13F COMFORT SYS USA COM 199908104 64,800 0 0.00 3,655 23.15 0.0041
2018-08-09 2018-06-30 13F COMFORT SYS USA COM 199908104 64,800 0 0.00 2,968 11.04 0.0034
2018-05-04 2018-03-31 13F COMFORT SYS USA COM 199908104 64,800 1,200 1.89 2,673 -3.71 0.0033
2018-02-07 2017-12-31 13F COMFORT SYS USA COM 199908104 63,600 2,400 3.92 2,776 27.05 0.0030
2017-11-03 2017-09-30 13F COMFORT SYS USA COM 199908104 61,200 0 0.00 2,185 -3.79 0.0025
2017-08-09 2017-06-30 13F COMFORT SYS USA COM 199908104 61,200 0 0.00 2,271 1.25 0.0027
2017-05-04 2017-03-31 13F COMFORT SYS USA COM 199908104 61,200 0 0.00 2,243 10.06 0.0028
2017-02-08 2016-12-31 13F COMFORT SYS USA COM 199908104 61,200 0 0.00 2,038 13.60 0.0032
2016-11-07 2016-09-30 13F COMFORT SYS USA COM 199908104 61,200 -1,900 -3.01 1,794 -12.70 0.0029
2016-08-03 2016-06-30 13F COMFORT SYS USA COM 199908104 63,100 0 0.00 2,055 6.09 0.0033
2016-05-04 2016-03-31 13F COMFORT SYS USA COM 199908104 63,100 12,200 23.97 1,937 33.86 0.0036
2016-02-03 2015-12-31 13F COMFORT SYS USA COM 199908104 50,900 0 0.00 1,447 4.25 0.0035
2015-11-04 2015-09-30 13F COMFORT SYS USA COM 199908104 50,900 6,300 14.13 1,388 35.55 0.0036
2015-08-05 2015-06-30 13F COMFORT SYS USA COM 199908104 44,600 1,100 2.53 1,024 11.91 0.0027
2015-05-06 2015-03-31 13F COMFORT SYS USA COM 199908104 43,500 43,500 0.00 915 0.0024
2015-02-03 2014-12-31 13F COMFORT SYS USA COM 199908104 0 -43,500 -100.00 0 -100.00
2014-11-04 2014-09-30 13F COMFORT SYS USA COM 199908104 43,500 0 0.00 589 -14.26 0.0023
2014-08-06 2014-06-30 13F COMFORT SYS USA COM 199908104 43,500 0 0.00 687 3.62 0.0025
2014-05-06 2014-03-31 13F COMFORT SYS USA COM 199908104 43,500 9,500 27.94 663 0.61 0.0026
2014-01-31 2013-12-31 13F COMFORT SYS USA COM 199908104 34,000 6,500 23.64 659 42.64 0.0026
2013-10-29 2013-09-30 13F COMFORT SYS USA COM 199908104 27,500 -2,300 -7.72 462 3.82 0.0019
2013-08-09 2013-06-30 13F FORT SYS USA COM 199908104 29,800 29,800 445 0.0020
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.