Sorry that I was unclear.
Since the IRS form 1099-B is reporting the disposal of the Solventum stock, you should refer to the Solventum stock information. The purchase date would be the date that the date that the stock was spun-off by 3M, not the date that you purchased the 3M.
Solventum basis is different. If you paid $100 for one share of 3M, your cost basis in 3M is $100.
After the spin-off, you may one share of 3M and one share of Solventum and your cost basis is still $100. The only issue is how you allocate the cost between the two stocks.
At the time of the spin-off, shareholder services information would have revealed the relative values of the two stocks at the time of the spin-off.
As an example, if one share of Solventum was considered to be worth one share of 3M, your original cost basis would now be $50 Solventum and $50 3M equals the $100 cost basis of the original 3M share.
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