Comfort Systems USA, Inc.
MX ˙ BMV ˙ US1999081045
SecurityMX:FIX / Comfort Systems USA, Inc.
InstitutionFred Alger Management, Llc
Latest Disclosed Ownership20,564 shares
Latest Disclosed Value $ 28,357,551
Fred Alger Management, Llc reports 24.47% decrease in ownership of FIX / Comfort Systems USA, Inc.

On May 15, 2026 - Fred Alger Management, Llc filed a 13F-HR form disclosing ownership of 20,564 shares of Comfort Systems USA, Inc. (MX:FIX) valued at $28,357,551 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 27,228 shares of Comfort Systems USA, Inc.. This represents a change in shares of -24.47% 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)
2026-05-15 2026-03-31 13F Comfort Systems USA Equity 199908104 20,564 -6,664 -24.47 28,358 11.59 0.1246
2026-02-17 2025-12-31 13F Comfort Systems USA Equity 199908104 27,228 -6,878 -20.17 25,412 -9.71 0.0997
2025-11-14 2025-09-30 13F Comfort Systems USA Equity 199908104 34,106 -8,189 -19.36 28,144 26.29 0.1095
2025-08-14 2025-06-30 13F Comfort Systems USA Equity 199908104 42,295 20,566 94.65 22,285 218.22 0.0997
2025-05-16 2025-03-31 13F Comfort Systems USA Equity 199908104 21,729 5,500 33.89 7,004 1.76 0.0399
2025-02-14 2024-12-31 13F Comfort Systems USA Equity 199908104 16,229 2,053 14.48 6,882 24.38 0.0328
2024-11-14 2024-09-30 13F COMFORT SYSTEMS USA Common 199908104 14,176 2,370 20.07 5,534 54.12 0.0268
2024-08-14 2024-06-30 13F COMFORT SYSTEMS USA Common 199908104 11,806 11,806 3,590 0.0175
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.