Mass. Gen. Laws ch. 110C, § 5: Time for filing or delivering copies of solicitation materials

Section 5. Copies of all advertisements, circulars, letters or other solicitation materials published by the offeror or the target company on or after the date that the take-over bid may be made in accordance with section two shall be filed with the secretary and delivered by the target company, or the offeror, as the case may be, to the other of them on the date that the same are first published or used or sent to offerees.