Six Flags Entertainment (FUN)
Six Flags Entertainment on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as services-amusement & recreation services.
23.0M
Short interest
settlement 2026-09-30
9.6
Days to cover
-0.2 days vs prior
45.1%
Short share of volume
2026-10-09
39,032
Fails to deliver
settlement 2026-09-11
Fri 6 Nov
Next earnings
estimated date
$248K
Insider flow, 90 days
1 buys, 0 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in FUN is 23,028,129 shares, up 3,437,608 shares over the last month. Over the last 48 readings it ranged from 6,359,877 shares (31 January 2025) to 23,572,662 shares (30 January 2026). The latest reading sits at the top of that range. At the reported average volume of 2.4M shares a day that is 9.6 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 23,028,129 | +7.7% | 2,391,764 | 9.63 |
| 2026-09-15 | 21,388,056 | +9.2% | 2,171,226 | 9.85 |
| 2026-08-31 | 19,590,521 | +6.0% | 1,628,916 | 12.03 |
| 2026-08-14 | 18,487,998 | -4.2% | 2,994,090 | 6.17 |
| 2026-07-31 | 19,297,605 | +3.8% | 1,907,128 | 10.12 |
| 2026-07-15 | 18,591,079 | -3.1% | 2,317,738 | 8.02 |
| 2026-06-30 | 19,189,202 | +7.2% | 2,655,003 | 7.23 |
| 2026-06-15 | 17,904,835 | +1.6% | 1,955,170 | 9.16 |
| 2026-05-29 | 17,616,117 | +1.6% | 1,991,024 | 8.85 |
| 2026-05-15 | 17,344,242 | -8.1% | 2,653,015 | 6.54 |
| 2026-04-30 | 18,878,349 | -5.3% | 1,449,127 | 13.03 |
| 2026-04-15 | 19,933,742 | -1.4% | 1,793,257 | 11.12 |
| 2026-03-31 | 20,205,666 | +0.1% | 1,834,973 | 11.01 |
| 2026-03-13 | 20,180,145 | -4.9% | 1,716,785 | 11.75 |
| 2026-02-27 | 21,218,977 | -6.3% | 2,264,024 | 9.37 |
| 2026-02-13 | 22,633,112 | -4.0% | 2,217,375 | 10.21 |
| 2026-01-30 | 23,572,662 | +1.4% | 2,957,239 | 7.97 |
| 2026-01-15 | 23,255,046 | +7.2% | 2,499,322 | 9.30 |
| 2025-12-31 | 21,687,885 | +11.8% | 3,299,325 | 6.57 |
| 2025-12-15 | 19,406,635 | -0.3% | 2,498,546 | 7.77 |
| 2025-11-28 | 19,469,331 | +12.4% | 4,706,838 | 4.14 |
| 2025-11-14 | 17,327,820 | -0.9% | 5,327,361 | 3.25 |
| 2025-10-31 | 17,484,783 | -11.0% | 5,052,130 | 3.46 |
| 2025-10-15 | 19,647,169 | -1.9% | 3,349,756 | 5.87 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of FUN volume is 45.1%, down 6.2 points over the last five sessions. Over the last 30 readings it ranged from 39.9% (30 September 2026) to 80.6% (11 September 2026). The latest reading is 12.7 points below the 30-session average of 57.8%, on 756K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 341K | 756K | 45.1% | 0 |
| 2026-10-08 | 692K | 1.3M | 54.4% | 0 |
| 2026-10-07 | 837K | 1.3M | 64.2% | 12 |
| 2026-10-06 | 465K | 773K | 60.2% | 0 |
| 2026-10-05 | 528K | 1.1M | 47.8% | 0 |
| 2026-10-02 | 513K | 1.0M | 51.2% | 432 |
| 2026-10-01 | 768K | 1.2M | 65.0% | 0 |
| 2026-09-30 | 579K | 1.5M | 39.9% | 200 |
| 2026-09-29 | 725K | 1.3M | 53.9% | 336 |
| 2026-09-28 | 585K | 862K | 67.8% | 0 |
| 2026-09-25 | 202K | 347K | 58.1% | 0 |
| 2026-09-24 | 587K | 818K | 71.8% | 0 |
| 2026-09-23 | 464K | 782K | 59.3% | 0 |
| 2026-09-22 | 447K | 709K | 63.1% | 400 |
| 2026-09-21 | 350K | 618K | 56.6% | 100 |
| 2026-09-18 | 369K | 760K | 48.5% | 3,787 |
| 2026-09-17 | 304K | 516K | 59.0% | 238 |
| 2026-09-16 | 415K | 752K | 55.2% | 402 |
| 2026-09-15 | 453K | 818K | 55.4% | 0 |
| 2026-09-14 | 256K | 585K | 43.7% | 7,300 |
| 2026-09-11 | 1.3M | 1.6M | 80.6% | 9,571 |
| 2026-09-10 | 456K | 691K | 65.9% | 137 |
| 2026-09-09 | 438K | 695K | 63.1% | 0 |
| 2026-09-08 | 252K | 542K | 46.5% | 0 |
| 2026-09-04 | 383K | 808K | 47.4% | 0 |
| 2026-09-03 | 388K | 748K | 51.8% | 0 |
| 2026-09-02 | 639K | 1.1M | 57.8% | 2,016 |
| 2026-09-01 | 791K | 1.1M | 69.5% | 320 |
| 2026-08-31 | 749K | 1.0M | 73.8% | 7 |
| 2026-08-28 | 300K | 533K | 56.2% | 1 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 11 September 2026, the fails-to-deliver balance in FUN is 39,032 shares, up 38,996 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (19 May 2026) to 1,387,174 shares (30 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-11 | 39,032 | $13.67 | $534K |
| 2026-09-08 | 36 | $15.51 | $558 |
| 2026-09-02 | 47,018 | $14.24 | $670K |
| 2026-08-28 | 52,418 | $15.96 | $837K |
| 2026-08-20 | 3,746 | $16.90 | $63K |
| 2026-07-29 | 150,722 | $18.73 | $2.8M |
| 2026-07-28 | 75 | $17.59 | $1K |
| 2026-07-27 | 75 | $17.37 | $1K |
| 2026-07-01 | 140 | $21.30 | $3K |
| 2026-06-30 | 1,387,174 | $20.56 | $28.5M |
| 2026-06-29 | 615,226 | $22.01 | $13.5M |
| 2026-06-23 | 75,116 | $22.71 | $1.7M |
| 2026-06-22 | 899 | $24.94 | $22K |
| 2026-06-18 | 5,360 | $24.87 | $133K |
| 2026-06-15 | 5,223 | $23.44 | $122K |
| 2026-06-05 | 244,646 | $21.21 | $5.2M |
| 2026-06-04 | 15 | $20.29 | $304 |
| 2026-05-29 | 116 | $20.30 | $2K |
| 2026-05-19 | 1 | $20.08 | $20 |
| 2026-05-14 | 379 | $19.32 | $7K |
| 2026-05-05 | 82 | $17.66 | $1K |
| 2026-04-16 | 92 | $19.62 | $2K |
| 2026-04-08 | 3 | $17.58 | $53 |
| 2026-03-30 | 107 | $16.60 | $2K |
| 2026-03-27 | 1,045 | $17.68 | $18K |
| 2026-03-25 | 4 | $17.04 | $68 |
| 2026-03-24 | 33,562 | $16.77 | $563K |
| 2026-03-20 | 8,114 | $17.42 | $141K |
| 2026-03-17 | 49,303 | $16.39 | $808K |
| 2026-03-16 | 671 | $15.99 | $11K |
Insider trades
SEC Form 4, newest first, 50 of 94 shown. JSONInsiders at FUN reported 1 open-market buy worth $248K in the last 90 days and no open-market sells. Latest filing: Reilly John T (President & CEO) on 2026-08-12.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-08-12 | Reilly John T | President & CEO | Buy | 16K | $15.80 | $248K | 298K |
| 2026-07-29 | Walia Ashok | Chief Financial Officer | Grant | 67K | $0.00 | $0 | 107K |
| 2026-07-29 | Hoffman David R. | Chief Accounting Officer | Grant | 16K | $0.00 | $0 | 115K |
| 2026-07-29 | Bennett Christopher Lawrence | Chief Legal Officer | Grant | 9K | $0.00 | $0 | 47K |
| 2026-06-25 | Reilly John T | President & CEO | Grant | 122K | $0.00 | $0 | 282K |
| 2026-06-25 | Hoffman David R. | Chief Accounting Officer | Grant | 13K | $0.00 | $0 | 99K |
| 2026-06-25 | Martin Ziegenfuss Amy | Chief Marketing Officer | Grant | 19K | $0.00 | $0 | 19K |
| 2026-06-25 | Tastepe Tayfun | Chief Digital & Tech Officer | Grant | 13K | $0.00 | $0 | 43K |
| 2026-06-25 | Walia Ashok | Chief Financial Officer | Grant | 41K | $0.00 | $0 | 41K |
| 2026-06-25 | Bennett Christopher Lawrence | Chief Legal Officer | Grant | 37K | $0.00 | $0 | 37K |
| 2026-06-15 | JAFFER REHAN | Director | Buy | 125K | $23.41 | $2.9M | 4.9M |
| 2026-06-12 | JAFFER REHAN | Director | Buy | 125K | $23.69 | $3.0M | 4.8M |
| 2026-05-21 | Spiegel Marilyn G | Director | Buy | 3K | $19.10 | $48K | 15K |
| 2026-05-12 | Spiegel Marilyn G | Director | Buy | 3K | $19.13 | $48K | 13K |
| 2026-05-12 | HADDRILL RICHARD M | Executive Chair | Buy | 10K | $19.08 | $191K | 230K |
| 2026-04-16 | HADDRILL RICHARD M | Executive Chair | Grant | 218K | $0.00 | $0 | 220K |
| 2026-02-23 | Witherow Brian C | Chief Financial Officer | Tax withholding | 16K | $18.24 | $300K | 298K |
| 2026-02-23 | Tastepe Tayfun | Chief Digital & Tech Officer | Tax withholding | 4K | $18.24 | $66K | 30K |
| 2026-02-23 | Nurse Brian | Chief Legal Officer | Tax withholding | 11K | $18.24 | $205K | 79K |
| 2026-02-23 | Hoffman David R. | Chief Accounting Officer | Tax withholding | 5K | $18.24 | $87K | 86K |
| 2026-02-23 | FISHER TIM | Chief Operating Officer | Tax withholding | 19K | $18.24 | $348K | 222K |
| 2026-02-23 | Dieckmann Christian | Chief Commercial Officer | Tax withholding | 4K | $18.24 | $71K | 37K |
| 2026-01-02 | Mason Jennifer | Director | Grant | 13K | $0.00 | $0 | 26K |
| 2026-01-02 | Dutra Felipe | Director | Grant | 13K | $0.00 | $0 | 16K |
| 2025-12-31 | Hanrahan Daniel J | Director | Option exercise | 7K | price not stated in the filing | not stated | 65K |
| 2025-12-31 | Hanrahan Daniel J | Director | Disposition | 7K | $15.34 | $110K | 58K |
| 2025-12-31 | BASSOUL SELIM A | Executive Chairman | Tax withholding | 111K | $15.34 | $1.7M | 537K |
| 2025-12-31 | BASSOUL SELIM A | Executive Chairman | Grant | 261K | $0.00 | $0 | 648K |
| 2025-12-24 | CARR LOUIS | Director | Disposition | 4K | $14.35 | $51K | 15K |
| 2025-12-24 | CARR LOUIS | Director | Option exercise | 4K | price not stated in the filing | not stated | 19K |
| 2025-12-08 | Reilly John T | President & CEO | Grant | 160K | $0.00 | $0 | 160K |
| 2025-12-05 | Zimmerman Richard | President & CEO | Tax withholding | 130K | $15.32 | $2.0M | 771K |
| 2025-12-05 | Zimmerman Richard | President & CEO | Grant | 298K | $0.00 | $0 | 901K |
| 2025-12-05 | Zimmerman Richard | President & CEO | Tax withholding | 115K | $15.32 | $1.8M | 603K |
| 2025-08-22 | FISHER TIM | Chief Operating Officer | Tax withholding | 22K | $25.59 | $559K | 241K |
| 2025-08-07 | Hoffman Steven E | Director | Buy | 5K | $24.79 | $125K | 13K |
| 2025-08-07 | Hoffman Steven E | Director | Buy | 5K | $24.54 | $123K | 8K |
| 2025-06-25 | Olivet D Scott | Director | Option exercise | 7K | $0.00 | $0 | 41K |
| 2025-06-25 | Hoffman Steven E | Director | Grant | 3K | $0.00 | $0 | 3K |
| 2025-06-25 | Dutra Felipe | Director | Grant | 3K | $0.00 | $0 | 3K |
| 2025-06-20 | SAULS MONICA | Chief HR Officer | Tax withholding | 10K | $30.34 | $312K | 34K |
| 2025-06-20 | SAULS MONICA | Chief HR Officer | Grant | 24K | $0.00 | $0 | 45K |
| 2025-06-20 | SAULS MONICA | Chief HR Officer | Tax withholding | 16K | $30.34 | $484K | 21K |
| 2025-06-04 | Zimmerman Richard | President & CEO | Tax withholding | 25K | $33.11 | $830K | 717K |
| 2025-06-04 | Witherow Brian C | Chief Financial Officer | Tax withholding | 11K | $33.11 | $372K | 314K |
| 2025-06-04 | Nurse Brian | Chief Legal Officer | Tax withholding | 7K | $33.11 | $215K | 90K |
| 2025-06-04 | Hoffman David R. | Chief Accounting Officer | Tax withholding | 3K | $33.11 | $112K | 91K |
| 2025-06-04 | FISHER TIM | Chief Operating Officer | Tax withholding | 11K | $33.11 | $369K | 263K |
| 2025-06-04 | Dieckmann Christian | Chief Commercial Officer | Tax withholding | 3K | $33.11 | $92K | 41K |
| 2025-05-12 | Frymire Michelle M | Director | Sell | 6K | $37.89 | $225K | 7K |
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 rarer.
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON9 holders report 5% or more of FUN in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 14.4% of the class (14,734,649 shares), filed 2026-07-30 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G/Ano. 5 | Darlington Partners Capital Management, LPinvestment adviser, partnership | 7.7M | 7.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 5 | Darlington Partners GP, LLCparent holding company, other entity | 7.7M | 7.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 5 | Darlington Partners, L.P.partnership | 7.7M | 7.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 5 | Scott W. Clarkparent holding company, individual | 7.7M | 7.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 5 | Ramsey B. Jishiparent holding company, individual | 7.7M | 7.5% | 2026-06-30 |
| 2026-07-30 | 13G/Ano. 9 | BlackRock, Inc.parent holding company | 14.7M | 14.4% | 2026-06-30 |
| 2026-05-12 | 13G/Ano. 2 | Morgan Stanleyparent holding company, corporation | 5.5M | 5.4% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 2 | Morgan Stanley Capital Services LLCbroker-dealer, corporation | 5.4M | 5.3% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Portfolio Managementinvestment adviser | 5.2M | 5.1% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 11 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding FUN at their latest 13F. JSON5 of the 30 tracked managers held FUN at their latest 13F, $32.5M in total at quarter-end prices. Citadel Advisors is the largest at $23.4M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 1.1M | $23.4M | 0.00% | -642K |
| AQR Capital Management | 2026-06-30 | 233K | $5.0M | 0.00% | new |
| Millennium Management | 2026-06-30 | 116K | $2.5M | 0.00% | -158K |
| Point72 Asset Management | 2026-06-30 | 50K | $1.1M | 0.00% | new |
| Two Sigma Investments | 2026-06-30 | 27K | $570K | 0.00% | new |
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.
What this page is
Six Flags Entertainment 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 puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, 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 one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Six Flags Entertainment (FUN), SEC CIK 1999001, listed on NYSE, classified by the SEC as services-amusement & recreation services. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-11.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-14.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-06.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-08-12.JSON and CSV
- Company record
- EDGAR filing index for CIK 1999001Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
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 large short position are rare and stand out; insider sells next to one 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.
Other companies the SEC classifies as services-amusement & recreation services
Other company pages
Datasets
Frequently Asked Questions
How much of FUN is sold short?
What is FUN's daily short volume?
Does FUN have fails to deliver?
Are FUN insiders buying or selling?
Who owns 5% or more of FUN?
Which tracked 13F managers own FUN?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.