First paragraph from this weekend's Weekly Breadth Data:
Stocks started 2018 with a bang as the major market indices were up by an average of 2.32% which was the largest average weekly gain since the week ending December 11, 2016. Leading the charge were the Dow and NYA which rose 2.30%, with the S&P 500 gaining 2.60%, while the NASDAQ was up 3.38%. The Dow notched its biggest weekly gain since the period ending December 1, 2017, as the S&P 500 recorded its best weekly rise since November 11, 2016, and the NASDAQ logging its best advance over the same period since December 9, 2016. On a historical basis, the Dow started off the new year with four consecutive record closes. This was the first time this has happened since 1964 as a part of an even longer streak of 13 straight weeks of new all time high closes from December 16, 1963 through March 9th, 1964!