Q. On a shul bulletin, the time for Yizkor is posted. Why? Does Yizkor need a minyan?
Can a patient say Izkor when he has to stay in bed?
A. Poskim rule that a minyan is not required for reciting Yizkor (Dudaei Sadeh 12, Moadei Kodesh p. and others). However, as applies to other tefilos, it is better when they are said in a group and by many, as the Talmud (Berachos 8a) teaches; Rebi Nassan says: Hakadosh Baruch Hu, does not despise the prayer of the many.
Horav Shlomo Miller’s Shlit’a opinion is similar.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a