Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionAcadian Asset Management Llc
Latest Disclosed Ownership34,958 shares
Latest Disclosed Value $ 48,190
Acadian Asset Management Llc reports 312.97% increase in ownership of FIX / Comfort Systems USA, Inc.

On May 13, 2026 - Acadian Asset Management Llc filed a 13F-HR form disclosing ownership of 34,958 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $48,190 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 8,465 shares of Comfort Systems USA, Inc.. This represents a change in shares of 312.97% 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 34,958 26,493 312.97 48 585.71 0.0684
2026-02-10 2025-12-31 13F COMFORT SYS USA COM 199908104 8,465 6,082 255.22 8 600.00 0.0130
2025-11-13 2025-09-30 13F COMFORT SYS USA COM 199908104 2,383 1,712 255.14 2 0.0034
2025-08-07 2025-06-30 13F COMFORT SYS USA COM 199908104 671 502 297.04 0 0.0007
2025-05-21 2025-03-31 13F COMFORT SYS USA COM 199908104 169 -17,751 -99.06 0 -100.00 0.0002
2025-02-11 2024-12-31 13F COMFORT SYS USA COM 199908104 17,920 -44,039 -71.08 8 -70.83 0.0220
2024-11-12 2024-09-30 13F COMFORT SYS USA COM 199908104 61,959 -59,955 -49.18 24 -35.14 0.0751
2024-08-06 2024-06-30 13F COMFORT SYS USA COM 199908104 121,914 49,088 67.40 37 60.87 0.1142
2024-05-10 2024-03-31 13F COMFORT SYS USA COM 199908104 72,826 72,826 23 0.0806
2024-02-13 2023-12-31 13F COMFORT SYS USA COM 199908104 0 -3,072 -100.00 0 0.0000
2023-11-13 2023-09-30 13F COMFORT SYS USA COM 199908104 3,072 -31,351 -91.08 1 -100.00 0.0022
2023-08-07 2023-06-30 13F COMFORT SYS USA COM 199908104 34,423 -58,801 -63.07 6 -61.54 0.0232
2023-05-11 2023-03-31 13F COMFORT SYS USA COM 199908104 93,224 49,925 115.30 14 225.00 0.0596
2023-02-14 2022-12-31 13F COMFORT SYS USA COM 199908104 43,299 43,299 5 0.0245
2021-11-12 2021-09-30 13F COMFORT SYS USA COM 199908104 0 -7,967 -100.00 0 -100.00
2021-08-11 2021-06-30 13F COMFORT SYS USA COM 199908104 7,967 -3,684 -31.62 628 -27.82 0.0024
2021-05-11 2021-03-31 13F COMFORT SYS USA COM 199908104 11,651 -11,259 -49.14 870 -27.92 0.0034
2021-02-11 2020-12-31 13F COMFORT SYS USA COM 199908104 22,910 -1,461 -5.99 1,207 -3.98 0.0047
2020-11-09 2020-09-30 13F COMFORT SYS USA COM 199908104 24,371 -27,772 -53.26 1,257 -40.85 0.0053
2020-08-12 2020-06-30 13F COMFORT SYS USA COM 199908104 52,143 -8,216 -13.61 2,125 -3.72 0.0091
2020-05-11 2020-03-31 13F COMFORT SYS USA COM 199908104 60,359 -5,966 -9.00 2,207 -33.22 0.0126
2020-02-06 2019-12-31 13F COMFORT SYS USA COM 199908104 66,325 14,103 27.01 3,305 43.20 0.0150
2019-11-07 2019-09-30 13F COMFORT SYS USA COM 199908104 52,222 -5,477 -9.49 2,308 -21.58 0.0099
2019-08-08 2019-06-30 13F COMFORT SYS USA COM 199908104 57,699 -9,752 -14.46 2,943 -16.70 0.0141
2019-05-09 2019-03-31 13F COMFORT SYS USA COM 199908104 67,451 -14,892 -18.09 3,533 -1.75 0.0152
2019-02-07 2018-12-31 13F COMFORT SYS USA COM 199908104 82,343 49,001 146.96 3,596 91.17 0.0178
2018-10-30 2018-09-30 13F COMFORT SYS USA COM 199908104 33,342 30,365 1,019.99 1,881 1,283.09 0.0078
2018-07-24 2018-06-30 13F COMFORT SYS USA COM 199908104 2,977 2,977 136 0.0006
2017-01-19 2016-12-31 13F COMFORT SYS USA COM 199908104 0 -364,619 -100.00 0 -100.00
2016-10-20 2016-09-30 13F COMFORT SYS USA COM 199908104 364,619 -978,769 -72.86 10,687 -75.57 0.0529
2016-07-19 2016-06-30 13F COMFORT SYS USA COM 199908104 1,343,388 -64,029 -4.55 43,751 -2.15 0.2236
2016-04-14 2016-03-31 13F COMFORT SYS USA COM 199908104 1,407,417 -6,353 -0.45 44,712 11.28 0.2257
2016-01-14 2015-12-31 13F COMFORT SYS USA COM 199908104 1,413,770 490,959 53.20 40,180 59.74 0.2100
2015-10-15 2015-09-30 13F COMFORT SYS USA COM 199908104 922,811 596,516 182.81 25,154 235.92 0.1372
2015-08-11 2015-06-30 13F COMFORT SYS USA COM 199908104 326,295 317,132 3,461.01 7,488 3,779.79 0.0363
2015-04-20 2015-03-31 13F/A-1 COMFORT SYS USA COM 199908104 9,163 9,163 0.00 193 0.0009
2015-01-23 2014-12-31 13F COMFORT SYS USA COM 199908104 0 -63,324 -100.00 0 -100.00
2014-10-22 2014-09-30 13F COMFORT SYS USA COM 199908104 63,324 -15,660 -19.83 858 -31.25 0.0041
2014-07-21 2014-06-30 13F COMFORT SYS USA COM 199908104 78,984 -109,736 -58.15 1,248 -56.61 0.0061
2014-04-22 2014-03-31 13F COMFORT SYS USA COM 199908104 188,720 -35,397 -15.79 2,876 -33.81 0.0151
2014-01-22 2013-12-31 13F COMFORT SYS USA COM 199908104 224,117 175,640 362.32 4,345 433.13 0.0242
2013-10-18 2013-09-30 13F COMFORT SYS USA COM 199908104 48,477 48,477 815 0.0053
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.