But some Nasdaq stocks still managed to post gains even in a down market, and a big winner on the day was software-as-a-service company Datadog (NASDAQ: DDOG). Investors in the Nasdaq Composite (NASDAQINDEX: ^IXIC) have been worried about inflation lately, and the latest reading from the Bureau of Labor Statistics on Thursday morning sent shock waves through the stock market. News that the Consumer Price Index rose 0.6% in January to post a 7.5% year-over-year gain fanned the flames for those who believe the Federal Reserve will have to take drastic action to get inflationary pressures under control.