|A well-known name may be shortened even on first
appearance if clear:
DuPont, IBM, Ford, AT&T.
However, when there is
much material about a company, try to give its full name on first
appearance. Generally do not abbreviate Company or Corporation or use an
ampersand unless it is so done on the organization's letterhead.
Inc. and Ltd are usually abbreviated in company names, although they are generally omitted in editorial contexts. Ltd is usually written without a period. To simplify credit punctuation, the period may be left off Inc in credit lines.
Use all capitals only if the letters are individually pronounced:
IBM, BMW; but Visa, not VISA
Ikea, not IKEA
Do not use special type or symbols: Walmart, not Wal*Mart.
Note: When a company is the antecedent for a pronoun, the pronoun is singular.