Question: when is an 8k required to be filed
[{'answer': 'bankruptcy', 'provenance': [{'wikipedia_id': '6263659', 'title': 'Form 8-K', 'start_paragraph_id': 1, 'start_character': 301, 'end_paragraph_id': 1, 'end_character': 311, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'departure of a CEO', 'provenance': [{'wikipedia_id': '6263659', 'title': 'Form 8-K', 'start_paragraph_id': 1, 'start_character': 315, 'end_paragraph_id': 1, 'end_character': 333, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6263659', 'title': 'Form 8-K', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 660, 'bleu_score': 0.608837206100451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11827262129304975078}, 'section': 'Section::::Abstract.'}]}]