The corporate filings that record the change of name or the merger, together with employment letters, contracts and pay statements spanning both names. Choose documents that meet the requirement actually stated, rather than assuming only a recent registry extract counts. Older dated records often prove the sequence better than a current one.
Language and format before you submit
Anything filed with USCIS in French needs a full certified English translation, and a partial or summary translation is not that. A consular post may state different language requirements, so check the instruction addressed to you rather than applying one rule everywhere. Keep the originals, the translations and the certifications together, and label each document with the name and dates it supports.
Keep a dated log of the bank’s questions, your responses and any documents still missing.
Keep the trade confirmation, the settlement statement, account statements spanning the period, and the outgoing transfer record, so the path from holding to sale proceeds to gift can be followed document by document.