L-R: Mark Zuckerberg, CEO of Facebook, Satya Nadella, CEO of Microsoft, and Sundar Picahi, CEO of Google.Reuters | Getty ImagesThe S&P 500 is trading at a record and the Nasdaq is at its highest in two years. Alphabet shares reached a new pinnacle on Thursday, as did Meta and Microsoft, which ran past $3 trillion in market cap.Don't tell that to the bosses.While Wall Street cheers on Silicon Valley, tech companies are downsizing at an accelerating clip. So far in January, some 23,670 workers hav...