3M Company (MMM)

[Enterprising Investor]

Holders of 99 shares or less will not be subject to proration.

Beneficial holders (other than participants in the 3M 401(k) Plans) of less than 100 shares of 3M Common Stock who validly tender all of their shares may elect not to be subject to proration by checking the “Odd Lot” box in the letter of transmittal. If your odd-lot shares are held by a broker for your account, you can contact the broker and request this preferential treatment. All of your odd lot shares will be accepted for exchange without proration if 3M completes the exchange offer.