Comfort Systems USA, Inc. (FIX) Ownership
FIX ownership summary
as of October 18, 2026- Institutions
- 95.8% of shares outstanding
- Insiders
- 1.08% of shares outstanding
- Shares outstanding
- 35.2M
- Float
- 34.7M shares available to trade
- Short interest
- 2.79% 850K shares short
- Days to cover
- 2.62 short interest down 6.6% vs prior month
- Institutions 95.75%
- Insiders 1.08%
- Other investors 3.17%
FIX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 9.65% | 3.4M | $4.89B | −115,244 (−3.3%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.53% | 2.3M | $3.31B | +11,560 (+0.5%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 5.30% | 1.9M | $2.69B | −15,014 (−0.8%) | June 30, 2026 |
| 4 | FMR Inc | 4.72% | 1.7M | $2.39B | +210,282 (+14.5%) | June 30, 2026 |
| 5 | State Street Corp | 4.37% | 1.5M | $2.21B | +65,260 (+4.4%) | June 30, 2026 |
| 6 | Geode Capital Management, LLC | 3.27% | 1.2M | $1.66B | −87,269 (−7.0%) | June 30, 2026 |
| 7 | AQR Capital Management LLC | 3.01% | 1.1M | $1.52B | −57,213 (−5.1%) | June 30, 2026 |
| 8 | JPMorgan Chase & Co | 2.38% | 838K | $1.21B | −51,474 (−5.8%) | June 30, 2026 |
| 9 | Capital World Investors | 2.05% | 720K | $1.04B | −145,536 (−16.8%) | June 30, 2026 |
| 10 | Amvescap Plc. | 1.87% | 658K | $947.4M | +51,734 (+8.5%) | June 30, 2026 |
| 11 | NORGES BANK | 1.34% | 472K | $678.6M | −31,609 (−6.3%) | June 30, 2026 |
| 12 | Morgan Stanley - Brokerage Accounts | 1.22% | 430K | $618.9M | −30,050 (−6.5%) | June 30, 2026 |
| 13 | First Trust Advisors L.P. | 1.07% | 375K | $539.8M | −40,796 (−9.8%) | June 30, 2026 |
| 14 | Westfield Capital Management Company, L.P. | 1.01% | 355K | $511.5M | −265,482 (−42.8%) | June 30, 2026 |
| 15 | Federated Hermes Inc | 0.97% | 341K | $491.4M | +74,455 (+27.9%) | June 30, 2026 |
| 16 | Northern Trust Corp | 0.97% | 341K | $490.7M | +11,894 (+3.6%) | June 30, 2026 |
| 17 | T. Rowe Price Associates, Inc. | 0.92% | 325K | $467.2M | +163,502 (+101.4%) | June 30, 2026 |
| 18 | Charles Schwab Investment Management Inc | 0.85% | 298K | $428.6M | +10,110 (+3.5%) | June 30, 2026 |
| 19 | Amundi | 0.83% | 293K | $421.5M | +156,069 (+114.1%) | June 30, 2026 |
| 20 | Dimensional Fund Advisors, Inc. | 0.81% | 285K | $410.8M | +5,498 (+2.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 10 holders added 760K shares and 10 cut 840K.
FIX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.18% | 1.1M | $1.61B | −2,694 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.63% | 924K | $1.33B | −10,438 (−1.1%) | September 30, 2026 |
| 3 | Vanguard MStar Mid Cap Index Instl | 2.14% | 754K | $1.08B | −7,813 (−1.0%) | September 30, 2026 |
| 4 | iShares Core S&P 500 ETF | 1.33% | 468K | $673.3M | −740 (−0.2%) | September 30, 2026 |
| 5 | Fidelity 500 Index | 1.30% | 456K | $656.5M | +1,753 (+0.4%) | August 31, 2026 |
| 6 | State Street® SPDR® S&P 500® ETF | 1.23% | 432K | $621.8M | — | September 30, 2026 |
| 7 | Vanguard MStar Growth Index Investor | 1.21% | 426K | $612.9M | +28,842 (+7.3%) | September 30, 2026 |
| 8 | American Funds SMALLCAP World A | 0.99% | 347K | $499.2M | −88,132 (−20.3%) | September 30, 2026 |
| 9 | Fidelity Blue Chip Growth | 0.85% | 298K | $429.0M | +7,800 (+2.7%) | August 31, 2026 |
| 10 | Vanguard MStar Mid Cap Growth ETF | 0.79% | 276K | $397.6M | +5,870 (+2.2%) | September 30, 2026 |
| 11 | Vanguard Dividend Appreciation ETF | 0.56% | 199K | $286.1M | −153 (−0.1%) | September 30, 2026 |
| 12 | JPMorgan Mid Cap Growth I | 0.56% | 198K | $284.2M | +4,065 (+2.1%) | August 31, 2026 |
| 13 | State Street® IndstrlSelSectSPDR®ETF | 0.56% | 197K | $283.9M | −220 (−0.1%) | September 30, 2026 |
| 14 | iShares Russell Mid-Cap Growth ETF | 0.56% | 196K | $282.1M | −210 (−0.1%) | September 30, 2026 |
| 15 | Vanguard Institutional Index I | 0.53% | 186K | $267.5M | −1,931 (−1.0%) | September 30, 2026 |
| 16 | iShares MSCI USA Quality Factor ETF | 0.48% | 168K | $241.6M | +156 (+0.1%) | September 30, 2026 |
| 17 | iShares Russell Mid-Cap ETF | 0.41% | 144K | $207.1M | +266 (+0.2%) | September 30, 2026 |
| 18 | Fidelity Capital & Income | 0.39% | 136K | $195.1M | — | July 31, 2026 |
| 19 | Lord Abbett Growth Leaders I | 0.38% | 133K | $190.7M | −1,780 (−1.3%) | August 31, 2026 |
| 20 | Fidelity Mid Cap Index | 0.38% | 132K | $190.6M | +421 (+0.3%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
FIX insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-03 | Terrence Reed | Sell | $1,397.33 | 1,116 | $1.6M |
| 2026-03-03 | Darcy Anderson | Sell | $1,369.74 | 4,500 | $6.2M |
| 2026-02-25 | Brian E Lane | Sell | $1,453.12 | 9,365 | $13.6M |
| 2026-02-25 | Franklin Myers | Sell | $1,472.56 | 8,636 | $12.7M |
| 2026-02-24 | Constance Ellen Skidmore | Sell | $1,425.00 | 1,000 | $1.4M |
| 2026-02-24 | Terrence Reed | Sell | $1,457.17 | 671 | $977,761 |
| 2026-02-24 | William J Sandbrook | Sell | $1,443.32 | 2,500 | $3.6M |
| 2026-02-23 | Pablo G Mercado | Sell | $1,405.00 | 500 | $702,500 |
| 2026-02-23 | William George III | Sell | $1,434.97 | 9,000 | $12.9M |
| 2025-12-04 | Laura Finley Howell | Sell | $996.16 | 1,000 | $996,160 |
| 2025-12-04 | Byron Donalds | Buy | $1,003.80 | — | — |
| 2025-12-01 | William George III | Sell | $958.88 | 4,370 | $4.2M |
| 2025-11-24 | Brian E Lane | Sell | $947.98 | 7,158 | $6.8M |
| 2025-10-31 | Darcy Anderson | Sell | $958.72 | 4,000 | $3.8M |
| 2025-10-29 | Herman E Bulls | Sell | $1,013.62 | 2,000 | $2.0M |
| 2025-10-29 | Pablo G Mercado | Sell | $1,005.41 | 2,500 | $2.5M |
| 2025-10-29 | Franklin Myers | Sell | $1,006.68 | 5,000 | $5.0M |
| 2025-09-10 | William J Sandbrook | Sell | $733.56 | 800 | $586,848 |
| 2025-09-09 | William J Sandbrook | Sell | $708.55 | 700 | $495,985 |
| 2025-08-22 | Pablo G Mercado | Sell | $695.88 | 1,078 | $750,159 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
FIX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns FIX
Institutional investors own 95.8% of Comfort Systems's shares and insiders 1.08%. The largest holder is BlackRock Inc with 9.65% of the shares (3.4M), as of June 30, 2026. Among the top 20 institutions, 10 added shares and 10 reduced their stake in the latest filings. Short interest is 2.79% of the float, or 2.62 days of average trading volume. The share count fell 5.7% since 2014.
Related: FIX analyst forecast, FIX key metrics, FIX dividend history. See the FIX stock overview for the latest quote and news.
FIX ownership FAQ
Who owns the most Comfort Systems stock?
The largest shareholders of Comfort Systems are BlackRock Inc (9.65%), Vanguard Capital Management, LLC (6.53%), Vanguard Portfolio Management, LLC (5.30%), FMR Inc (4.72%), State Street Corp (4.37%).
What percentage of Comfort Systems is owned by institutions?
Institutions hold 95.8% of Comfort Systems's shares outstanding; insiders hold 1.08%.
Which funds own Comfort Systems?
The largest fund holders of Comfort Systems are Vanguard MStar Total Stk Mkt Idx Invest (3.18%), Vanguard 500 Index Investor (2.63%), Vanguard MStar Mid Cap Index Instl (2.14%), iShares Core S&P 500 ETF (1.33%), Fidelity 500 Index (1.30%).
What is Comfort Systems's short interest?
850K shares of Comfort Systems were sold short, 2.79% of the float; at the average daily volume it would take 2.62 days to cover.
Are insiders buying or selling Comfort Systems?
Of the latest 20 reported insider transactions in Comfort Systems (since August 22, 2025), 1 were purchases and 19 were sales.
How many shares of Comfort Systems are outstanding?
Comfort Systems has 35.2M shares outstanding, of which 34.7M are in the public float.