XOOMAR

COMFORT SYSTEMS USA INC (FIX)

Every FINRA and SEC series the site collects for COMFORT SYSTEMS USA INC: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on NYSE, classified by the SEC as electrical work.

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910K

Short interest

settlement 2026-08-31

2.2

Days to cover

-0.5% vs prior

62.6%

Short share of volume

2026-09-11

121

Fails to deliver

settlement 2026-08-13

-$56.3M

Insider flow, 90 days

0 buys, 5 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 31 August 2026, short interest in FIX is 910,248 shares, up 214,327 shares over the last month. Over the last 48 readings it ranged from 382,335 shares (15 October 2024) to 1,109,009 shares (15 May 2025). At the reported average volume of 412K shares a day that is 2.2 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-31910,248-0.5%412,1162.21
2026-08-14915,049+31.5%378,6802.42
2026-07-31695,921-17.1%621,4771.12
2026-07-15839,258+12.4%434,7881.93
2026-06-30746,501-5.1%617,6871.21
2026-06-15786,903-4.7%462,6371.70
2026-05-29825,373-8.2%433,0801.91
2026-05-15898,803+18.1%383,8942.34
2026-04-30760,735+0.0%450,7741.69
2026-04-15760,531+22.4%335,0792.27
2026-03-31621,334-7.1%454,7391.37
2026-03-13669,099+2.5%439,6981.52
2026-02-27652,846+1.0%566,4881.15
2026-02-13646,648-11.8%398,5281.62
2026-01-30732,808-8.6%356,5462.06
2026-01-15801,544+3.4%451,6481.77
2025-12-31775,068-2.7%1,047,7271.00
2025-12-15796,621+8.4%470,1951.69
2025-11-28734,974+12.1%709,8661.04
2025-11-14655,811+17.4%380,4671.72
2025-10-31558,433-9.8%477,9131.17
2025-10-15619,281-6.9%303,5782.04
2025-09-30665,142-9.1%400,0871.66
2025-09-15732,031+6.0%407,6831.80

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of FIX volume is 62.6%, up 14.6 points over the last five sessions. Over the last 52 readings it ranged from 23.7% (11 August 2026) to 62.6% (11 September 2026). The latest reading sits at the top of that range. The latest reading is 15.1 points above the 30-session average of 47.4%, on 146K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-1192K146K62.6%124
2026-09-1052K91K57.1%12
2026-09-0966K113K58.6%583
2026-09-0879K132K59.8%10
2026-09-0460K113K52.9%55
2026-09-0356K117K48.0%10
2026-09-0261K151K40.4%24
2026-09-0183K181K46.1%499
2026-08-3186K177K48.8%459
2026-08-2870K153K46.1%897
2026-08-2772K161K44.7%148
2026-08-2671K149K47.5%36
2026-08-2568K176K38.9%2,263
2026-08-2496K225K42.8%204
2026-08-2161K151K40.6%34
2026-08-2078K149K52.3%62
2026-08-1993K179K52.0%257
2026-08-1893K211K43.9%92
2026-08-17105K188K55.8%2,435
2026-08-1476K178K42.9%40
2026-08-1355K110K50.2%35
2026-08-1254K119K45.4%52
2026-08-1149K208K23.7%53
2026-08-1053K105K50.8%200
2026-08-0778K162K48.3%545
2026-08-0658K133K44.0%24
2026-08-0579K148K53.2%208
2026-08-0482K195K42.2%64
2026-08-0362K158K39.3%1
2026-07-3170K157K44.4%3,340

Fails to deliver

SEC, by settlement date. JSON

As of 13 August 2026, the fails-to-deliver balance in FIX is 121 shares, up 113 shares over the last settlement date. Over the last 52 readings it ranged from 2 shares (23 March 2026) to 16,637 shares (15 June 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-13121$1738.82$210K
2026-07-108$1781.42$14K
2026-07-095$1684.94$8K
2026-07-0615,510$1741.30$27.0M
2026-07-0244$1865.15$82K
2026-07-015$1981.95$10K
2026-06-296$1854.23$11K
2026-06-25615$1954.47$1.2M
2026-06-24102$1908.07$195K
2026-06-2221$1967.41$41K
2026-06-162$1952.02$4K
2026-06-1516,637$1877.61$31.2M
2026-06-12469$1843.42$865K
2026-06-0961$1852.03$113K
2026-05-2953$1855.15$98K
2026-05-15241$2042.36$492K
2026-05-14649$2034.63$1.3M
2026-04-272$1726.12$3K
2026-04-2055$1650.47$91K
2026-04-1719$1605.97$31K
2026-04-064$1417.19$6K
2026-03-25448$1461.52$655K
2026-03-249$1408.25$13K
2026-03-232$1356.75$3K
2026-03-1957$1423.00$81K
2026-02-231,047$1462.23$1.5M
2026-01-214,491$1134.75$5.1M
2026-01-201,000$1119.98$1.1M
2026-01-0641$1032.31$42K
2025-12-23329$950.79$313K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at FIX reported 5 open-market sells worth $56.3M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Lane Brian E. (CHIEF EXECUTIVE OFF.) on 2026-08-26.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-08-26Lane Brian E.CHIEF EXECUTIVE OFF.Sell16K$1608.21$25.8M145K
2026-08-17GEORGE WILLIAM IIICHIEF FINANCIAL OFFICERSell3K$1859.65$4.7M30K
2026-08-11MYERS FRANKLINn/aSell4K$1693.92$6.8M8K
2026-08-10MYERS FRANKLINn/aSell4K$1690.47$5.9M59K
2026-06-24MYERS FRANKLINn/aSell7K$1954.47$13.1M62K
2026-05-27Hardy Rhoman Jn/aSell342$1900.08$650K2K
2026-05-21MYERS FRANKLINn/aGift273$0.00$069K
2026-05-18Hardy Rhoman Jn/aGrant105$0.00$02K
2026-05-18Wallis-Lage Cindy L.n/aGrant105$0.00$06K
2026-05-18Kapoor Gauravn/aGrant105$0.00$0832
2026-05-18Skidmore Constance Ellenn/aGrant105$0.00$013K
2026-05-18Mercado, Pablo G.n/aGrant105$0.00$03K
2026-05-18SANDBROOK WILLIAM Jn/aGrant105$0.00$08K
2026-05-18MYERS FRANKLINn/aGrant105$0.00$069K
2026-05-18BULLS HERMAN En/aGrant105$0.00$030K
2026-05-18ANDERSON DARCYn/aGrant105$0.00$018K
2026-05-11Shaeff JulieCHIEF ACCOUNTING OFFICERSell1K$2000.37$2.2M13K
2026-05-11GEORGE WILLIAM IIICHIEF FINANCIAL OFFICERSell1K$2020.96$2.0M33K
2026-05-08GEORGE WILLIAM IIICHIEF FINANCIAL OFFICERSell4K$1948.17$7.8M34K
2026-05-07MYERS FRANKLINn/aSell5K$1902.57$8.6M69K
2026-05-07MYERS FRANKLINn/aGift256$0.00$073K
2026-05-07MYERS FRANKLINn/aGift205$0.00$074K
2026-05-07MYERS FRANKLINn/aGift51$0.00$074K
2026-05-05Lane Brian E.CHIEF EXECUTIVE OFF.Sell11K$1969.84$21.9M161K
2026-04-30Mercado, Pablo G.n/aSell500$1779.78$890K3K
2026-04-29SANDBROOK WILLIAM Jn/aSell2K$1732.67$2.6M8K
2026-04-01Eslicker Rachel R.SVP &amp; GENERAL COUNSELTax withholding43$1429.60$61K608
2026-04-01Eslicker Rachel R.SVP &amp; GENERAL COUNSELTax withholding25$1429.60$36K651
2026-04-01Eslicker Rachel R.SVP &amp; GENERAL COUNSELTax withholding31$1429.60$44K676
2026-04-01Reed TerrenceSVP &amp; CHROTax withholding93$1429.60$133K3K
2026-04-01Reed TerrenceSVP &amp; CHROTax withholding82$1429.60$117K3K
2026-04-01Reed TerrenceSVP &amp; CHROTax withholding98$1429.60$140K3K
2026-04-01Lane Brian E.CHIEF EXECUTIVE OFF.Tax withholding2K$1429.60$2.2M172K
2026-04-01Lane Brian E.CHIEF EXECUTIVE OFF.Tax withholding941$1429.60$1.3M174K
2026-04-01Lane Brian E.CHIEF EXECUTIVE OFF.Tax withholding1K$1429.60$1.6M175K
2026-04-01Trent T McKennaPRESIDENT/CHIEF OPERATING OFF.Tax withholding341$1429.60$487K22K
2026-04-01Trent T McKennaPRESIDENT/CHIEF OPERATING OFF.Tax withholding210$1429.60$300K23K
2026-04-01Trent T McKennaPRESIDENT/CHIEF OPERATING OFF.Tax withholding266$1429.60$380K23K
2026-04-01Shaeff JulieCHIEF ACCOUNTING OFFICERTax withholding145$1429.60$207K14K
2026-04-01Shaeff JulieCHIEF ACCOUNTING OFFICERTax withholding87$1429.60$124K14K
2026-04-01GEORGE WILLIAM IIICHIEF FINANCIAL OFFICERTax withholding500$1429.60$715K38K
2026-04-01GEORGE WILLIAM IIICHIEF FINANCIAL OFFICERTax withholding297$1429.60$425K38K
2026-04-01GEORGE WILLIAM IIICHIEF FINANCIAL OFFICERTax withholding284$1429.60$406K39K
2026-03-23Eslicker Rachel R.SVP &amp; GENERAL COUNSELGrant217$0.00$0707
2026-03-23Reed TerrenceSVP &amp; CHROTax withholding56$1408.25$79K3K
2026-03-23Reed TerrenceSVP &amp; CHROGrant188$0.00$03K
2026-03-23Reed TerrenceSVP &amp; CHROGrant275$0.00$03K
2026-03-23Lane Brian E.CHIEF EXECUTIVE OFF.Tax withholding910$1408.25$1.3M176K
2026-03-23Lane Brian E.CHIEF EXECUTIVE OFF.Grant2K$0.00$0177K
2026-03-23Lane Brian E.CHIEF EXECUTIVE OFF.Grant3K$0.00$0174K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.

Planned sales (Form 144)

Newest first. JSON

4 Form 144 notices on file for FIX worth $43.2M at the prices reported; 4 in the last 90 days worth $43.2M. Latest: BRIAN E LANE filed on 2026-08-26 to sell 16,024 shares ($25.8M) from 2026-08-26.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-08-26BRIAN E LANEOfficer, Director16K$25.8M0.046%2026-08-26Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-17GEORGE WILLIAM IIIOfficer3K$4.7M0.007%2026-08-17Raymond James & Associates, Inc.
2026-08-11Franklin MyersDirector4K$6.7M0.011%2026-08-11BNY Pershing
2026-08-10MYERS FRANKLINDirector4K$5.9M0.010%2026-08-10FIDELITY BROKERAGE SERVICES LLC

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

7 holders above 5% have filed on FIX, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 8.3% of the class (2,917,000 shares), filed 2026-01-21 for an event on 2025-12-31.

FiledFormHolderSharesOf classEvent
2026-04-2913GVanguard Capital Managementinvestment adviser2.6M7.5%2026-03-31
2026-04-2913GVanguard Portfolio Managementinvestment adviser1.9M5.4%2026-03-31
2026-03-2613G/Ano. 19The Vanguard Groupinvestment adviser00.0%2026-03-13
2026-02-1313G/Ano. 2Capital World Investorsinvestment adviser1.6M4.7%2025-12-31
2026-01-3013G/Ano. 18The Vanguard Groupinvestment adviser4.3M12.2%2025-12-31
2026-01-2113G/Ano. 5BlackRock, Inc.parent holding company2.9M8.3%2025-12-31
2025-12-0413G/Ano. 4BlackRock, Inc.parent holding company3.8M10.8%2025-11-30
2025-11-1313G/Ano. 1Capital World Investorsinvestment adviser1.8M5.1%2025-09-30
2025-11-0513GFMR LLCparent holding company1.9M5.4%2025-09-30
2025-11-0513GAbigail P. Johnsonindividual1.9M5.4%2025-09-30

13F holders

Tracked managers holding FIX at their latest 13F. JSON

10 of the 30 tracked managers held FIX at their latest 13F, $3.61B in total at quarter-end prices. AQR Capital Management is the largest at $2.08B (0.7% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 6 cut.

FundQuarterSharesValueOf portfolioChange in shares
AQR Capital Management2026-06-301.1M$2.08B0.73%-57K
Citadel Advisors2026-06-30268K$531.5M0.06%-33K
Point72 Asset Management2026-06-30188K$373.3M0.41%-73K
D. E. Shaw & Co.2026-06-30110K$218.9M0.10%+14K
Renaissance Technologies2026-06-3076K$150.9M0.21%+20K
Millennium Management2026-06-3051K$101.2M0.04%-12K
Bridgewater Associates2026-06-3049K$96.1M0.39%-38K
Coatue Management2026-06-3018K$35.3M0.07%new or n/a
Two Sigma Investments2026-06-3011K$21.3M0.02%-2K
Fisher Asset Management2026-06-30311$617K0.00%+2

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In Q2 2026 (quarter ended 2026-06-30) COMFORT SYSTEMS USA INC reported revenue of $3.27B, up 50.3% from the same quarter a year earlier, and net income of $441.6M (12.53 diluted EPS). In FY 2025 it generated $1.19B of operating cash flow and spent $216.0M on buybacks and $68.8M on dividends. As of 2026-06-30, cash was $1.85B against $54.1M of debt.

Cash
$1.85B
Debt
$54.1M
Equity
$3.22B
Total assets
$8.49B
Shares outstanding
35,194,329

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 20262026-06-30$3.27B$441.6M13.5%12.53
Q1 20262026-03-31$2.87B$370.4M12.9%10.51
Q3 20252025-09-30$2.45B$291.6M11.9%8.25
Q2 20252025-06-30$2.17B$230.8M10.6%6.53
Q1 20252025-03-31$1.83B$169.3M9.2%4.75
Q4 2024derived2024-12-31$1.87Bn/an/an/a
Q3 20242024-09-30$1.81B$146.2M8.1%4.09
Q2 20242024-06-30$1.81B$134.0M7.4%3.74

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31n/an/a$1.19B$154.9M$216.0M$68.8M
FY 20242024-12-31$7.03Bn/a$849.1M$111.1M$57.9M$42.8M
FY 20232023-12-31$5.21Bn/a$639.6M$94.8M$21.2M$30.4M
FY 20222022-12-31$4.14Bn/a$301.5M$48.4M$38.2M$20.1M
FY 20212021-12-31$3.07Bn/a$180.2M$22.3M$27.1M$17.4M

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-17 from the cover page.

What this page is

COMFORT SYSTEMS USA INC in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows COMFORT SYSTEMS USA INC (FIX), SEC CIK 1035983, listed on NYSE, classified by the SEC as electrical work. The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-13.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-08-26.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-04-29.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-08-26.JSON and CSV
Company record
EDGAR filing index for CIK 1035983Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 14 Sep 05:40 UTC.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Datasets

Frequently Asked Questions

How much of FIX is sold short?
910,248 shares were held short at the 2026-08-31 settlement, 2.2 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is FIX's daily short volume?
On 2026-09-11, 91,571 of the 146,357 FIX shares reported to FINRA were sold short, 62.6% of the day's reported volume. Short volume is a flow for one day, not a position.
Does FIX have fails to deliver?
The SEC's latest file shows 121 FIX shares failed to deliver at settlement 2026-08-13. Fails are reported per settlement date and published twice a month with a lag.
Are FIX insiders buying or selling?
Insiders at FIX reported 5 open-market sells worth $56.3M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Lane Brian E. (CHIEF EXECUTIVE OFF.) on 2026-08-26.
Have FIX insiders filed to sell?
4 Form 144 notices on file for FIX worth $43.2M at the prices reported; 4 in the last 90 days worth $43.2M. Latest: BRIAN E LANE filed on 2026-08-26 to sell 16,024 shares ($25.8M) from 2026-08-26.
Who owns more than 5% of FIX?
7 holders above 5% have filed on FIX, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 8.3% of the class (2,917,000 shares), filed 2026-01-21 for an event on 2025-12-31.
What did FIX report last quarter?
In Q2 2026 (quarter ended 2026-06-30) COMFORT SYSTEMS USA INC reported revenue of $3.27B, up 50.3% from the same quarter a year earlier, and net income of $441.6M (12.53 diluted EPS). In FY 2025 it generated $1.19B of operating cash flow and spent $216.0M on buybacks and $68.8M on dividends. As of 2026-06-30, cash was $1.85B against $54.1M of debt.
Which funds hold FIX?
10 of the 30 tracked managers held FIX at their latest 13F, $3.61B in total at quarter-end prices. AQR Capital Management is the largest at $2.08B (0.7% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 6 cut.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.