AKA Codex Leningradensis
(dated 1008 A.D)
According to a note on the manuscript, it was copied in A.D. 1008 from texts written by Aaron ben Moses ben Asher.
It is presently stored in the Leningrad Public Library and, unlike the Aleppo Codex, it was available to scholars earlier in the century and was used as the textual base for the popular Hebrew texts of today: Biblia Hebraica edited by R. Kittel, and its revision Biblia Hebraica Stuttgartensia, edited by K. Elliger and W. Rudolf.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Texts and Manuscripts of the Old Testament by Mark R. Norton, Page 159.)