The Dow Jones Industrial Average (DJIA) on Monday notched its 70th record high in 2017, tying 1995 for the most in one year. And with a couple weeks left before we flip the calendar -- not to mention the index taking off in early trading today, ahead of an expected vote on tax reform -- there's a good chance this year will go down in history for the blue-chip index. Further, the Dow and the S&P 500 Index (SPX) are both eyeing their ninth straight monthly gains -- a feat not accomplished in decades for the stock market.
Should the DJIA tag another all-time closing high today, it will mark the 71st of the year for the index -- a new record. Meanwhile, the SPX just notched its 62nd record close of 2017 on Monday, and if the broad-market barometer can score three more before January, it will tie the most in one year since 1964 -- the second-best year on record. The current record can't mathematically be defeated before 2018, with 77 all-time closing highs accomplished in 1995.
There have been just five nine-month winning streaks for the Dow, the last ending in November 1958 -- before Alaska and Hawaii were U.S. states, and prior to Fidel Castro taking power in Cuba. The SPX, meanwhile, has enjoyed just four nine-month winning streaks ever, the last ending in April 1983 -- two months before Sally Ride boarded the Challenger, and preceding Michael Jackson's Thriller video.
Historically, strength tends to beget strength for both the Dow and SPX. One month after a nine-month winning streak, the DJIA was up 2.53%, on average -- more than four times its average anytime one-month gain of 0.63%. Three months and one year after, the Dow's average return was also roughly twice its anytime return, and the index was higher 100% of the time.
The S&P 500 Index was up 75% of the time at each checkpoint after a nine-month winning streak. One month later, the S&P was higher by 2.65%, on average, compared to its average anytime one-month return of 0.68%, looking at data since 1935. It's the same story looking all the way to one year out, with the SPX higher by 16.55%, on average, after a nine-month win streak, compared to 8.32% anytime.
If past is prologue, the bull market could continue deep into 2018, should the major stock market indexes end 2017 with a bang.