| SC 13E3/A | 16-09-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922100591/tm2226017d2_sc13e3a.htm | sec.gov | filings |
| 6-K | 16-09-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922100586/tm2226017d3_ex99-1.htm | sec.gov | filings |
| SC 13D/A | 16-09-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922100613/tm2226017d1_sc13da.htm | sec.gov | filings |
| 6-K | 15-09-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922100188/tm2225935d1_ex99-1.htm | sec.gov | filings |
| 25-NSE | 15-09-2022 | https://www.sec.gov/Archives/edgar/data/1354457/000135445722000526/xslF25X02/primary_doc.xml | sec.gov | filings |
| 20-F/A | 22-08-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000141057822002716/hlg-20210630x20fa.htm | sec.gov | filings |
| SC 13E3/A | 11-08-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922088920/tm2223181d1_sc13e3a.htm | sec.gov | filings |
| 6-K | 11-08-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922088936/tm2223180d1_ex99-1.htm | sec.gov | filings |
| UPLOAD | 09-08-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000000000022008450/filename1.pdf | sec.gov | filings |
| SC 13E3/A | 14-07-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922079649/tm2217220d4_sc13e3a.htm | sec.gov | filings |
| 6-K | 13-07-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922079534/tm2220972d1_ex99-1.htm | sec.gov | filings |
| CORRESP | 08-07-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922078430/filename1.htm | sec.gov | filings |
| SC 13E3/A | 05-07-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922077412/tm2217220d2_sc13e3a.htm | sec.gov | filings |
| UPLOAD | 23-06-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000000000022006781/filename1.pdf | sec.gov | filings |
| SC 13E3 | 01-06-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922067114/tm2217220d1_sc13e3.htm | sec.gov | filings |
| SC 13D | 18-05-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922062220/tm2215735d1_sc13d.htm | sec.gov | filings |
| 6-K | 09-05-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922057569/tm2214859d1_ex99-1.htm | sec.gov | filings |
| 6-K | 23-03-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922037045/0001104659-22-037045.txt | sec.gov | filings |
| 6-K | 31-01-2022 | https://www.sec.gov/Archives/edgar/data/1596964/000110465922009571/tm224878d1_ex99-1.htm | sec.gov | filings |
| 6-K | 23-12-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921153114/tm2136243d1_ex99-1.htm | sec.gov | filings |
| 20-F | 12-11-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000141057821000168/hlg-20210630x20f.htm | sec.gov | filings |
| 6-K | 12-11-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921138126/tm2132643d1_ex99-1.htm | sec.gov | filings |
| NT 20-F | 01-11-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921132160/tm2131502d1_nt20f.htm | sec.gov | filings |
| 6-K | 15-07-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921092640/tm2122293d1_ex99-1.htm | sec.gov | filings |
| 6-K | 06-07-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921089464/tm2121551d1_ex99-1.htm | sec.gov | filings |
| 6-K | 22-06-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921084140/tm2120350d1_ex99-1.htm | sec.gov | filings |
| 6-K | 09-06-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921078816/tm2119264d1_ex99-1.htm | sec.gov | filings |
| 6-K | 26-05-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921072484/tm2117631d1_ex99-1.htm | sec.gov | filings |
| 6-K | 19-05-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921069359/tm2115406d2_ex99-1.htm | sec.gov | filings |
| 6-K | 06-05-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921062451/tm2115406d1_ex99-1.htm | sec.gov | filings |
| 6-K | 26-04-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921054754/tm2114142d1_ex99-1.htm | sec.gov | filings |
| 6-K | 09-03-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921033844/tm218875d1_ex99-1.htm | sec.gov | filings |
| 6-K | 02-03-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921030819/tm218419d1_ex99-1.htm | sec.gov | filings |
| 6-K | 02-02-2021 | https://www.sec.gov/Archives/edgar/data/1596964/000110465921011023/tm215128d1_ex99-1.htm | sec.gov | filings |
| 6-K | 30-11-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920130520/tm2037289d1_ex99-1.htm | sec.gov | filings |
| 6-K | 23-11-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920128495/tm2036560d1_ex99-1.htm | sec.gov | filings |
| 20-F | 14-10-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920114957/tm2030472-1_20f.htm | sec.gov | filings |
| 6-K | 14-10-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920114982/tm2033211d1_ex99-1.htm | sec.gov | filings |
| 6-K | 09-10-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920113702/tm2032594d1_ex99-1.htm | sec.gov | filings |
| 6-K | 22-09-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920107402/tm2031536d1_ex99-1.htm | sec.gov | filings |
| 6-K | 18-09-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920106343/tm2031233d1_ex99-1.htm | sec.gov | filings |
| 6-K | 23-06-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920076052/tm2023218d1_ex99-1.htm | sec.gov | filings |
| 6-K | 18-05-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920063245/tm2015002d2_ex99-1.htm | sec.gov | filings |
| 6-K | 29-04-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920052896/tm2018035d1_ex99-1.htm | sec.gov | filings |
| 6-K | 03-04-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920042969/tm2015002d1_ex99-1.htm | sec.gov | filings |
| 6-K | 24-03-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920037775/tm2013166d2_ex99-1.htm | sec.gov | filings |
| 6-K | 19-03-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920035626/tm2013166d1_ex99-1.htm | sec.gov | filings |
| 6-K | 18-02-2020 | https://www.sec.gov/Archives/edgar/data/1596964/000110465920022294/tm209274d1_ex99-1.htm | sec.gov | filings |
| 20-F | 23-09-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419045647/tv527788_20f.htm | sec.gov | filings |
| 6-K | 23-09-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419045649/tv529843_ex99-1.htm | sec.gov | filings |
| 6-K | 19-09-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419045152/tv529742_ex99-1.htm | sec.gov | filings |
| 6-K | 06-06-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419030104/tv523212_ex99-1.htm | sec.gov | filings |
| 6-K | 29-04-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419021972/tv520080_ex99-1.htm | sec.gov | filings |
| 6-K | 26-03-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419016024/tv517187_ex99-1.htm | sec.gov | filings |
| 6-K | 25-03-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419015814/tv517051_ex99-1.htm | sec.gov | filings |
| 6-K | 30-01-2019 | https://www.sec.gov/Archives/edgar/data/1596964/000114420419003664/tv511985_ex99-1.htm | sec.gov | filings |
| 6-K | 21-12-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000114420418065903/tv509719_ex99-1.htm | sec.gov | filings |
| 6-K | 09-11-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000114420418058512/tv506783_ex99-1.htm | sec.gov | filings |
| 6-K | 23-10-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000114420418054979/tv505345_ex99-1.htm | sec.gov | filings |
| 20-F | 18-10-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000114420418054407/tv502621_20f.htm | sec.gov | filings |
| 6-K | 18-10-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000114420418054417/tv505042_ex99-1.htm | sec.gov | filings |
| 6-K | 26-09-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000114420418050847/tv503557_ex99-1.htm | sec.gov | filings |
| 6-K | 25-05-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518175380/d594538dex991.htm | sec.gov | filings |
| 6-K | 18-05-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518167998/d573330dex991.htm | sec.gov | filings |
| 6-K | 26-04-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518131720/d576989dex991.htm | sec.gov | filings |
| 6-K | 10-04-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518112381/d568210dex991.htm | sec.gov | filings |
| 6-K | 30-03-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518103429/d551902dex101.htm | sec.gov | filings |
| 6-K | 26-03-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518095647/d560108dex991.htm | sec.gov | filings |
| 6-K | 21-03-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518089959/d519494dex991.htm | sec.gov | filings |
| 6-K | 08-02-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518034990/d538955dex991.htm | sec.gov | filings |
| EFFECT | 08-01-2018 | https://www.sec.gov/Archives/edgar/data/1596964/999999999518000058/xslEFFECTX01/primary_doc.xml | sec.gov | filings |
| UPLOAD | 05-01-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000000000018000466/filename1.pdf | sec.gov | filings |
| CORRESP | 04-01-2018 | https://www.sec.gov/Archives/edgar/data/1596964/000119312518002151/filename1.htm | sec.gov | filings |
| F-3 | 22-12-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517377694/d499655df3.htm | sec.gov | filings |
| 6-K | 11-12-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517365451/d470664dex991.htm | sec.gov | filings |
| 6-K | 15-11-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517344294/d495213dex991.htm | sec.gov | filings |
| 6-K | 08-11-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517336535/d483146dex991.htm | sec.gov | filings |
| 6-K | 06-11-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517333679/d489867dex101.htm | sec.gov | filings |
| 6-K | 26-10-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517319521/d484020dex991.htm | sec.gov | filings |
| 20-F | 25-10-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517319290/d476431d20f.htm | sec.gov | filings |
| 6-K | 25-10-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517318829/d479902dex991.htm | sec.gov | filings |
| 6-K | 18-10-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517312513/d626424dex991.htm | sec.gov | filings |
| 6-K | 25-09-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517292730/d462723dex991.htm | sec.gov | filings |
| 6-K | 14-09-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517284835/d457318dex991.htm | sec.gov | filings |
| 6-K | 17-08-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517260791/0001193125-17-260791.txt | sec.gov | filings |
| 6-K | 19-07-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517231259/d421555dex991.htm | sec.gov | filings |
| 6-K | 30-06-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517219888/d419042dex101.htm | sec.gov | filings |
| 6-K | 25-05-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517183168/d382275dex991.htm | sec.gov | filings |
| 6-K | 28-04-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517147180/d385271dex991.htm | sec.gov | filings |
| 6-K | 30-03-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517103536/0001193125-17-103536.txt | sec.gov | filings |
| 20-F/A | 10-02-2017 | https://www.sec.gov/Archives/edgar/data/1596964/000119312517038037/d317373d20fa.htm | sec.gov | filings |
| 6-K | 18-11-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516772417/0001193125-16-772417.txt | sec.gov | filings |
| 20-F | 26-10-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516747468/d273750d20f.htm | sec.gov | filings |
| 6-K | 17-10-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516739664/0001193125-16-739664.txt | sec.gov | filings |
| 6-K | 30-09-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516727354/0001193125-16-727354.txt | sec.gov | filings |
| 6-K | 27-06-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516633047/0001193125-16-633047.txt | sec.gov | filings |
| 6-K | 20-06-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516625886/0001193125-16-625886.txt | sec.gov | filings |
| 6-K | 21-03-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516511899/0001193125-16-511899.txt | sec.gov | filings |
| SC 13G | 29-01-2016 | https://www.sec.gov/Archives/edgar/data/1596964/000119312516442710/d55544dsc13g.htm | sec.gov | filings |
| 6-K | 22-12-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515410027/0001193125-15-410027.txt | sec.gov | filings |
| 6-K | 28-10-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515356182/0001193125-15-356182.txt | sec.gov | filings |
| 20-F | 28-10-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515356279/d197251d20f.htm | sec.gov | filings |
| 6-K | 09-09-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515315289/0001193125-15-315289.txt | sec.gov | filings |
| EFFECT | 11-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/999999999515001579/xslEFFECTX01/primary_doc.xml | sec.gov | filings |
| EFFECT | 10-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/999999999515001564/xslEFFECTX01/primary_doc.xml | sec.gov | filings |
| POS EX | 10-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515219336/d659578dposex.htm | sec.gov | filings |
| 424B4 | 10-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515219354/d659578d424b4.htm | sec.gov | filings |
| CORRESP | 08-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515215745/filename1.htm | sec.gov | filings |
| CORRESP | 08-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515216096/filename1.htm | sec.gov | filings |
| F-1/A | 02-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515210264/d659578df1a.htm | sec.gov | filings |
| FWP | 02-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515210330/d659578dfwp.htm | sec.gov | filings |
| CORRESP | 02-06-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515210251/filename1.htm | sec.gov | filings |
| CORRESP | 15-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515190413/filename1.htm | sec.gov | filings |
| CORRESP | 15-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515190431/filename1.htm | sec.gov | filings |
| CORRESP | 13-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515185855/filename1.htm | sec.gov | filings |
| CORRESP | 13-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515185871/filename1.htm | sec.gov | filings |
| F-1/A | 01-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515165433/d659578df1a.htm | sec.gov | filings |
| FWP | 01-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515165688/d659578dfwp.htm | sec.gov | filings |
| CORRESP | 01-05-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515165454/filename1.htm | sec.gov | filings |
| 8-A12B | 03-04-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515118888/d901619d8a12b.htm | sec.gov | filings |
| F-1/A | 03-04-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515118874/d659578df1a.htm | sec.gov | filings |
| CORRESP | 03-04-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515118883/filename1.htm | sec.gov | filings |
| UPLOAD | 27-03-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000000000015018299/filename1.pdf | sec.gov | filings |
| CORRESP | 20-03-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515099703/filename1.htm | sec.gov | filings |
| F-1/A | 20-03-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515099655/d659578df1a.htm | sec.gov | filings |
| F-6 | 03-03-2015 | https://www.sec.gov/Archives/edgar/data/1471515/000095012715000018/a15-14_f6.htm | sec.gov | filings |
| CORRESP | 12-02-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000119312515045943/filename1.htm | sec.gov | filings |
| UPLOAD | 02-01-2015 | https://www.sec.gov/Archives/edgar/data/1596964/000000000015000143/filename1.pdf | sec.gov | filings |
| F-1 | 24-12-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000119312514453679/d659578df1.htm | sec.gov | filings |
| CORRESP | 24-12-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000119312514453681/filename1.htm | sec.gov | filings |
| UPLOAD | 02-12-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000000000014061206/filename1.pdf | sec.gov | filings |
| DRS/A | 21-11-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000095012314012479/filename1.htm | sec.gov | filings |
| DRSLTR | 21-11-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000095012314012482/filename1.htm | sec.gov | filings |
| UPLOAD | 06-11-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000000000014055376/filename1.pdf | sec.gov | filings |
| DRSLTR | 09-10-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000095012314010148/filename1.htm | sec.gov | filings |
| DRS/A | 09-10-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000095012314010147/filename1.htm | sec.gov | filings |
| UPLOAD | 18-02-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000000000014008048/filename1.pdf | sec.gov | filings |
| DRSLTR | 21-01-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000095012314000370/filename1.htm | sec.gov | filings |
| DRS | 21-01-2014 | https://www.sec.gov/Archives/edgar/data/1596964/000095012314000369/filename1.htm | sec.gov | filings |