CNBC's MacKenzie Sigalos brings you the day's top business news headlines. On today's show, CNBC's Julia Boorstin breaks down the Senate subcommittee hearing that grilled Facebook over its strategy for teen users. Plus, lawmakers approve a measure to avoid a government shutdown at midnight.

00:00 - CNBC After Hours, Sept. 30, 2021
0:15 - S&P posts worst month since March 2020
0:46 - Numbers to know
2:04 - Facebook grilled over teen strategy
4:47 - U.S. looks to avoid government shutdown

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