In January, the S&P 500 hit a record high for the first time in two years. Crossing that threshold made the bull market official, and it portends more upward momentum in the future. The S&P 500 returned an average of 285% during the last five bull markets, according to Yardeni Research, and many stocks are sure to rise during the current one. Investors hoping to capitalize on that upward momentum should be buying stocks today, and HubSpot (HUBS -0.10%) stands out as a compelling idea at its current valuatio ...