 3M MMM, -0.41 said Thursday it has received a total of about 214.2 million shares of common stock in its split-off exchange offer to shareholders to exchange their shares for shares of Garden SpinCo Corp. The exchange offer was part of the companys previously announced plan to spin off its healthcare business and create two listed companies. The SpinCo was created to hold the food and safety business ahead of a merger with a unit of Neogen Corp., which is expected to close later Thursday. 