try this array formula, confirm by Ctrl, Shift and Enter

assume your data is in column A

=SUM(OFFSET($A$1,LARGE(IF($A$1:$A$100<0,ROW($A$1: $A$100)),5)-1,0,100,1))
--
Hope this is helpful

Pls click the Yes button below if this post provide answer you have asked

Thank You

cheers, francis

Am not a greek but an ordinary user trying to assist another



"crabatin" wrote:

I have values in a table and want to add a column on the right that will look
to the left at the previous 20 columns and find the last 5 numbers
(rightmost) that are not zero and sum them.