@Kathleen You really aren't allowed to use "various" when it comes to the Sec 351 computation; that requires a lot-by-lot calculation as only GAINS are allowed, not losses. So while you do have a gain on each of the 3 "lots" you listed, you might be netting some losses in there to come to that gain. Too, for each lot where you do have a gain you report the lesser of the cash received or the "actual" gain on that lot using the cash plus stock received as the "proceeds". That said I've frequently advised people who have years and years of dividend reinvestments to pull together a year's worth of reinvestments as one lot, just to cut down on the work involved and under the assumption that's "close enough."
Look at your actual per share basis in the detail of your lots making up the 3 "lots" you've listed. If any lot has a per share basis of above $29.31 you have a loss on that lot and you need to pull it out. Any lots with per share basis between $6.07 and $29.30 will have a real gain that's less that the $20.17 per share used in the Sec 351 calculation. Any lots with a per share basis of $6.06 or less will use the $20.17 per share as the gain figure.
ASSUMING that the missing detail above put all the lots into that wide spread where actual gains would be reported I came up with reportable gains under the Sec 351 computation of $23.50, $40.21 and $5,889.01. That's using the Sec 351 proceeds figure of $25.4309 per share tendered. Of course for reporting purposes you use the cash proceeds reported on the 1099-B so you'd report
Proceeds Basis Gain
Long Term $6,302.56 $373.34 $5,929.22
Short Term $57.83 $34.32 $23.50
Then you use the remaining $3.88 of cash as "proceeds" against the remaining 13.23% of EMC basis for
Long Term $1,212.39 $307.57 $904.82
Short Term $11.12 $7.53 $3.59
