To clarify information previously given:
The stock obtained in the non-taxable spin-off reorganization maintains the characteristics of the original company's stock. Thus the ACQUISITION date for Solventum remains the SAME as the acquisition date for 3M, and the ACQUISTION method remains the same - purchase, if 3M was purchased, or inherited, if 3M was inherited.
It is true that the BASIS of the old 3M is allocated between the 2 new holdings. But it is NOT on an equal per share basis. Rather, the number of 3M shares remains unchanged, and has the basis of 84.48% of the previous basis. The number of Solventum shares is 1/4 of the number of 3M shares, and has the total basis of 15.52% of the previous basis. (These percentages are a composite of allocation numbers I have seen; they vary from source to source, but never by as much as 1/4 of 1 percent - presumably because of differing stock prices of Solventum and 3M at different points during the day of the split, which prices are the means for determining the allocation percentages.)
One site that discusses the matter is: https://www.iclub.com/faq/Home/Article?id=801#gsc.tab=0
Again, the Solventum acquisition date is the SAME as the 3M acquisition date, and the method of acquisition of Solventum (e.g. purchase, inherit, etc.) is the SAME as the method of acquisition of 3M.
