All trademark information–Trademark Applications (applications, drawing, specimen), Office Actions, Responses to Office Actions (ROA), assignments, petitions, etc– submitted to the USPTO is public information readily available to the public including any of your investors or future potential investors.
Having a solid, enforceable trademark and trademark application and registration is a good investment. Not Just Patents® can write a declaration or an affidavit of acquired distinctiveness to answer your merely descriptive refusal if the facts support this claim.
TMEP 1212 Acquired Distinctiveness or Secondary Meaning
Trademark Manual of Examining Procedure (TMEP) Chapter 1212