While the Dow enjoyed its best session since March on Monday, and the S&P 500 Index (SPX) secured a record closing high, the Nasdaq Composite (COMP) added a healthy 72 points, or 1.1%. Looking back at the Nasdaq's best days of late, we discovered a unique pattern emerging: the tech-rich COMP tends to fare particularly well on certain days of the week, and one weekday in particular has been especially lackluster for the index over the last few years.
Analyzing the Nasdaq's last 13 big days -- going by point changes -- all but three occurred on a Monday or Wednesday. The last outlier was on Tuesday, Aug. 22, and prior to that it was Friday, July 7. Before that, you'd have to go all the way back to Sept. 15, 2016, when the COMP advanced nearly 76 points on a Thursday.
This data is underscored when looking at the Nasdaq's one-day gains of at least 1% in 2017. According to Schaeffer's Senior Quantitative Analyst Rocky White, 80% of these big up days occurred on a Monday or Wednesday, at 40% apiece. Only once has the COMP added 1% or more on a Tuesday or Friday in 2017, and we've yet to see a one-day rally of at least 1% on a Thursday this year.