$HEI 4 SEC Filings

10-K 10-K405 10-K/A 10-Q 10-Q/A 144 3 4 424B1 424B3 424B5 4/A 5 5/A 8-A12B 8-A12B/A 8-A12G 8-A12G/A 8-K 8-K/A ARS CORRESP D DEF 14A DEFA14A DEFR14A FWP PRE 14A PRER14A S-3 S-3/A S-3ASR S-8 S-8 POS SC 13D SC 13D/A SC 13G SC 13G/A SCHEDULE 13G SCHEDULE 13G/A SD UPLOAD