Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionWaratah Capital Advisors Ltd.
Latest Disclosed Ownership10,729 shares
Latest Disclosed Value $ 14,795,184
Waratah Capital Advisors Ltd. ownership in FIX / Comfort Systems USA, Inc.

On May 11, 2026 - Waratah Capital Advisors Ltd. filed a 13F-HR form disclosing ownership of 10,729 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $14,795,184 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 30,161 shares of Comfort Systems USA, Inc.. This represents a change in shares of -64.43% during the quarter.

Waratah Capital Advisors Ltd. has a history of taking positions in derivatives of the underlying security (FIX) in the form of stock options.

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)
2026-05-11 2026-03-31 13F COMFORT SYS USA COM 199908104 10,729 -19,432 -64.43 14,795 -47.44 0.5636
2026-02-09 2025-12-31 13F COMFORT SYS USA COM 199908104 30,161 3,309 12.32 28,149 27.04 0.9476
2025-11-10 2025-09-30 13F COMFORT SYS USA COM 199908104 26,852 -17,351 -39.25 22,158 -6.52 0.3914
2025-08-11 2025-06-30 13F COMFORT SYS USA COM 199908104 44,203 39,871 920.38 23,702 1,597.85 0.6306
2025-05-13 2025-03-31 13F COMFORT SYS USA COM 199908104 4,332 4,332 1,396 0.0375
Disclosed Put 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
(%)
2026-05-11 2026-03-31 13F COMFORT SYS USA COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-09 2025-12-31 13F COMFORT SYS USA COM Put 14,000 13,066 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.