Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionSG Americas Securities, LLC
Latest Disclosed Ownership153,458 shares
Latest Disclosed Value $ 211,617
SG Americas Securities, LLC ownership in FIX / Comfort Systems USA, Inc.

On April 16, 2026 - SG Americas Securities, LLC filed a 13F-HR form disclosing ownership of 153,458 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $211,617 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 122,465 shares of Comfort Systems USA, Inc.. This represents a change in shares of 25.31% during the quarter.

SG Americas Securities, LLC has a history of taking positions in derivatives of the underlying security (FIX) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:FIX / Comfort Systems USA, Inc. Historical Put/Call Ratio
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)
2026-04-16 2026-03-31 13F COMFORT SYS USA INC COM COM 199908104 153,458 30,993 25.31 212 85.09 0.2272
2026-01-09 2025-12-31 13F COMFORT SYS USA INC COM COM 199908104 122,465 120,400 5,830.51 114 11,300.00 0.1459
2025-10-23 2025-09-30 13F COMFORT SYS USA INC COM COM 199908104 2,065 -776 -27.31 2 0.00 0.0057
2025-08-08 2025-06-30 13F COMFORT SYS USA INC COM COM 199908104 2,841 -3,784 -57.12 2 -50.00 0.0063
2025-04-15 2025-03-31 13F COMFORT SYS USA INC COM COM 199908104 6,625 6,625 2 0.0070
2025-01-17 2024-12-31 13F COMFORT SYS USA INC COM COM 199908104 0 -2,480 -100.00 0 0.0000
2024-10-03 2024-09-30 13F COMFORT SYS USA INC COM COM 199908104 2,480 -8,099 -76.56 1 -100.00 0.0035
2024-07-12 2024-06-30 13F COMFORT SYS USA INC COM COM 199908104 10,579 8,854 513.28 3 0.0187
2024-05-06 2024-03-31 13F COMFORT SYS USA INC COM COM 199908104 1,725 655 61.21 1 0.0026
2024-01-12 2023-12-31 13F COMFORT SYS USA INC COM COM 199908104 1,070 -9,832 -90.19 0 -100.00 0.0021
2023-10-13 2023-09-30 13F COMFORT SYS USA INC COM COM 199908104 10,902 8,872 437.04 2 0.0212
2023-07-10 2023-06-30 13F COMFORT SYS USA INC COM COM 199908104 2,030 2,030 0 0.0025
2023-04-28 2023-03-31 13F COMFORT SYS USA INC COM COM 199908104 0 -10,375 -100.00 0 -100.00
2023-02-02 2022-12-31 13F COMFORT SYS USA INC COM COM 199908104 10,375 4,094 65.18 1 -99.84 0.0145
2022-10-31 2022-09-30 13F COMFORT SYS USA INC COM COM 199908104 6,281 -8,150 -56.48 611 -49.08 0.0076
2022-07-29 2022-06-30 13F COMFORT SYS USA INC COM COM 199908104 14,431 13,234 1,105.60 1,200 1,021.50 0.0128
2022-04-29 2022-03-31 13F COMFORT SYS USA INC COM COM 199908104 1,197 -8,288 -87.38 107 -88.59 0.0008
2022-02-07 2021-12-31 13F COMFORT SYS USA INC COM COM 199908104 9,485 -25,284 -72.72 938 -62.18 0.0051
2021-11-01 2021-09-30 13F COMFORT SYS USA INC COM COM 199908104 34,769 30,932 806.15 2,480 721.19 0.0116
2021-08-12 2021-06-30 13F COMFORT SYS USA INC COM COM 199908104 3,837 -831 -17.80 302 -13.47 0.0014
2021-05-13 2021-03-31 13F COMFORT SYS USA INC COM COM 199908104 4,668 -11,448 -71.03 349 -58.89 0.0018
2021-02-04 2020-12-31 13F COMFORT SYS USA INC COM COM 199908104 16,116 16,116 849 0.0045
2020-11-09 2020-09-30 13F COMFORT SYS USA INC COM COM 199908104 0 -18,899 -100.00 0 -100.00
2020-07-20 2020-06-30 13F COMFORT SYS USA INC COM COM 199908104 18,899 10,874 135.50 770 162.80 0.0064
2020-04-30 2020-03-31 13F COMFORT SYS USA INC COM COM 199908104 8,025 5,355 200.56 293 120.30 0.0027
2020-01-28 2019-12-31 13F COMFORT SYS USA INC COM COM 199908104 2,670 -3,724 -58.24 133 -53.00 0.0012
2019-11-04 2019-09-30 13F COMFORT SYS USA INC COM COM 199908104 6,394 1,466 29.75 283 12.75 0.0023
2019-07-29 2019-06-30 13F COMFORT SYS USA INC COM COM 199908104 4,928 2,587 110.51 251 104.07 0.0017
2019-04-29 2019-03-31 13F COMFORT SYS USA INC COM COM 199908104 2,341 -3,553 -60.28 123 -52.14 0.0011
2019-01-31 2018-12-31 13F COMFORT SYS USA INC COM COM 199908104 5,894 -87,499 -93.69 257 -95.12 0.0022
2018-11-06 2018-09-30 13F COMFORT SYS USA INC COM COM 199908104 93,393 81,866 710.21 5,267 897.54 0.0390
2018-08-07 2018-06-30 13F COMFORT SYS USA INC COM COM 199908104 11,527 6,779 142.78 528 169.39 0.0048
2018-05-03 2018-03-31 13F COMFORT SYS USA INC COM COM 199908104 4,748 4,748 196 0.0016
2018-01-24 2017-12-31 13F COMFORT SYS USA INC COM COM 199908104 0 -9,230 -100.00 0 -100.00
2017-11-07 2017-09-30 13F COMFORT SYS USA INC COM COM 199908104 9,230 3,260 54.61 330 49.32 0.0029
2017-08-03 2017-06-30 13F COMFORT SYS USA INC COM COM 199908104 5,970 5,970 221 0.0020
2017-05-10 2017-03-31 13F COMFORT SYS USA INC COM COM 199908104 0 -12,171 -100.00 0 -100.00
2017-02-08 2016-12-31 13F COMFORT SYS USA INC COM COM 199908104 12,171 -10,200 -45.59 405 -38.26 0.0034
2017-02-08 2016-09-30 13F/A-1 COMFORT SYS USA INC COM COM 199908104 22,371 22,371 656 0.0069
2016-11-08 2016-09-30 13F COMFORT SYS USA INC COM COM 199908104 22,371 656
2016-08-03 2016-06-30 13F COMFORT SYS USA INC COM COM 199908104 0 -5,567 -100.00 0 -100.00
2016-05-12 2016-03-31 13F COMFORT SYS USA INC COM COM 199908104 5,567 5,567 0.00 177 0.0013
2015-05-13 2015-03-31 13F COMFORT SYS USA INC COM COM 199908104 0 -10,324 -100.00 0 -100.00
2015-02-12 2014-12-31 13F COMFORT SYS USA INC COM COM 199908104 10,324 -57,839 -84.85 177 -82.96 0.0009
2014-05-14 2014-03-31 13F COMFORT SYS USA INC COM COM 199908104 68,163 68,163 929.03 1,039 836.04 0.0045
2014-02-12 2013-12-31 13F COMFORT SYS USA INC COM COM 199908104 0 -6,624 -100.00 0 -100.00
2013-11-12 2013-09-30 13F COMFORT SYS USA INC COM COM 199908104 6,624 6,624 111 0.0005
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-04-16 2026-03-31 13F COMFORT SYS USA OPT Call 0 -100.00 0 n/a n/a n/a
2026-01-09 2025-12-31 13F COMFORT SYS USA OPT Call 20,000 1 n/a n/a n/a
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.