Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 158, § 37

Every corporation shall annually file in the office of the state secretary, within thirty days after the date fixed in its by-laws for its annual meeting, or within thirty days after the final adjournment thereof, but not more than three months after the date so fixed for said meeting, a certificate signed and sworn to by an officer of the corporation, stating the date of holding such meeting, the amount of capital stock as it then stands fixed by the corporation, and the amount then paid in. Such certificates shall be preserved by the state secretary in book form convenient for reference.