What happened Shares of Impinj (NASDAQ: PI) closed Tuesday's trading session 10.8% higher, propelled by updated revenue guidance for the fourth quarter. So what The maker of radio-frequency identification (RFID) tracking chips and data readers now expects fourth-quarter revenues to exceed $52 million. That's a 10.6% boost over the midpoint of management's existing guidance for this period. As a result, the year-over-year sales-growth target increased from 29% to 43%. Image source: Getty Images. Now what Impinj didn't provide any information on why the quarter's top-line results came in above expectations. Generally speaking, strong sales of Impinj's RFID tags and systems should indicate a bullish mood in the company's target sectors, as its customers beef up their RFID-based tracking infrastructure. The most likely reason for this guidance boost is that retailers and shipping services experienced a robust holiday quarter. Financial reports in the upcoming earnings season will either confirm or debunk this theory. The stock has now gained 56.4% in 52 weeks. Impinj is not a cheap investment these days, trading at 11 times trailing sales and 365 times forward earnings. You should think twice before taking action on Impinj's promising growth story at these nosebleed-inducing prices, but it could still be a robust long-term play for investors who don't mind a bit of pricing risk.. 10 stocks we like better than ImpinjWhen our award-winning analyst team has a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* They just revealed what they believe are the ten best stocks for investors to buy right now... and Impinj wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of January 10, 2022 Anders Bylund has no position in any of the stocks mentioned. The Motley Fool recommends Impinj. The Motley Fool has a disclosure policy.Source