Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionO'shaughnessy Asset Management, Llc
Latest Disclosed Ownership11,530 shares
Latest Disclosed Value $ 15,899,755
O'shaughnessy Asset Management, Llc reports 0.61% decrease in ownership of FIX / Comfort Systems USA, Inc.

On May 13, 2026 - O'shaughnessy Asset Management, Llc filed a 13F-HR form disclosing ownership of 11,530 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $15,899,755 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 11,601 shares of Comfort Systems USA, Inc.. This represents a change in shares of -0.61% 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)
2026-05-13 2026-03-31 13F COMFORT SYS USA COM 199908104 11,530 -71 -0.61 15,900 46.85 0.0742
2026-02-11 2025-12-31 13F COMFORT SYS USA COM 199908104 11,601 64 0.55 10,827 13.73 0.0598
2025-11-13 2025-09-30 13F COMFORT SYS USA COM 199908104 11,537 224 1.98 9,520 56.94 0.0559
2025-08-12 2025-06-30 13F COMFORT SYS USA COM 199908104 11,313 913 8.78 6,066 80.97 0.0413
2025-05-13 2025-03-31 13F COMFORT SYS USA COM 199908104 10,400 15 0.14 3,352 -23.87 0.0269
2025-02-12 2024-12-31 13F COMFORT SYS USA COM 199908104 10,385 -231 -2.18 4,404 -1.03 0.0374
2024-11-12 2024-09-30 13F COMFORT SYS USA COM 199908104 10,616 -1,375 -11.47 4,450 22.02 0.0397
2024-08-14 2024-06-30 13F COMFORT SYS USA COM 199908104 11,991 -1,780 -12.93 3,647 -16.66 0.0377
2024-05-13 2024-03-31 13F COMFORT SYS USA COM 199908104 13,771 -633 -4.39 4,375 47.70 0.0484
2024-02-09 2023-12-31 13F COMFORT SYS USA COM 199908104 14,404 -59 -0.41 2,962 20.21 0.0393
2023-11-13 2023-09-30 13F COMFORT SYS USA COM 199908104 14,463 3,181 28.20 2,465 33.05 0.0366
2023-08-11 2023-06-30 13F COMFORT SYS USA COM 199908104 11,282 6,214 122.61 1,853 150.61 0.0275
2023-05-12 2023-03-31 13F COMFORT SYS USA COM 199908104 5,068 91 1.83 740 29.20 0.0116
2023-02-10 2022-12-31 13F COMFORT SYS USA COM 199908104 4,977 -575 -10.36 573 5.93 0.0093
2022-11-14 2022-09-30 13F COMFORT SYS USA COM 199908104 5,552 -1,092 -16.44 540 -2.17 0.0101
2022-08-11 2022-06-30 13F COMFORT SYS USA COM 199908104 6,644 -188 -2.75 552 -9.21 0.0102
2022-05-13 2022-03-31 13F COMFORT SYS USA COM 199908104 6,832 -1,803 -20.88 608 -28.81 0.0101
2022-02-11 2021-12-31 13F COMFORT SYS USA COM 199908104 8,635 -1,508 -14.87 854 17.96 0.0152
2021-11-10 2021-09-30 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 10,143 3,197 46.03 724 32.36 0.0148
2021-08-09 2021-06-30 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 6,946 453 6.98 547 12.78 0.0109
2021-05-14 2021-03-31 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 6,493 181 2.87 485 46.08 0.0107
2021-02-11 2020-12-31 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 6,312 4,923 354.43 332 361.11 0.0090
2020-11-12 2020-09-30 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 1,389 1,389 72 0.0022
2020-02-12 2019-12-31 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 0 -8,549 -100.00 0 -100.00
2019-11-14 2019-09-30 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 8,549 -11,177 -56.66 378 -62.31 0.0090
2019-08-07 2019-06-30 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 19,726 -948 -4.59 1,003 -7.04 0.0234
2019-05-10 2019-03-31 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 20,674 456 2.26 1,079 22.06 0.0257
2019-02-11 2018-12-31 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 20,218 7,607 60.32 884 25.21 0.0224
2018-11-06 2018-09-30 13F COMFORT SYSTEMS USA INC COM USD.01 COMMON 199908104 12,611 12,611 706 0.0144
2017-02-10 2016-12-31 13F COMFORT SYS USA INC COM COMMON 199908104 0 -14,565 -100.00 0 -100.00
2016-11-10 2016-09-30 13F COMFORT SYS USA INC COM COMMON 199908104 14,565 -117,759 -88.99 427 -90.09 0.0100
2016-08-11 2016-06-30 13F COMFORT SYS USA INC COM COMMON 199908104 132,324 -71,431 -35.06 4,310 -34.45 0.1116
2016-05-13 2016-03-31 13F COMFORT SYS USA INC COM COMMON 199908104 203,755 -29,059 -12.48 6,575 -0.63 0.1649
2016-02-11 2015-12-31 13F COMFORT SYS USA INC COM COMMON 199908104 232,814 8,732 3.90 6,617 8.33 0.1636
2015-11-12 2015-09-30 13F COMFORT SYS USA INC COM COMMON 199908104 224,082 147,162 191.32 6,108 246.06 0.1271
2015-08-05 2015-06-30 13F COMFORT SYS USA INC COM COMMON 199908104 76,920 76,920 0.00 1,765 0.0358
2015-05-06 2015-03-31 13F COMFORT SYSTEMS USA COMMON 199908104 0 -141 -100.00 0 -100.00
2015-02-12 2014-12-31 13F COMFORT SYSTEMS USA COMMON 199908104 141 -18,178 -99.23 2 -99.19 0.0000
2014-11-17 2014-09-30 13F COMFORT SYSTEMS USA COMMON 199908104 18,319 -6,789 -27.04 248 -37.37 0.0045
2014-08-14 2014-06-30 13F COMFORT SYSTEMS USA COMMON 199908104 25,108 -4,931 -16.42 396 -13.35 0.0074
2014-05-15 2014-03-31 13F COMFORT SYSTEMS USA COMMON 199908104 30,039 -4,168 -12.18 457 -30.97 0.0091
2014-02-13 2013-12-31 13F/A-1 COMFORT SYSTEMS USA COMMON 199908104 34,207 34,207 662 0.0139
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.