S&P 500 falls nearly 2% on the week as selling broadens across indices

U.S. stocks ended the week lower, with the S&P 500 down nearly 2%, according to Seeking Alpha's weekly market snapshot published alongside a separate report describing the week's trading as tough on indices broadly. The decline was broad enough to pull major benchmarks into negative territory for the week, a reversal from the steadier gains seen in prior weeks. Insider selling was notable during the period too: executives at Samsara, Synopsys, TransUnion, Planet Labs, Beam Therapeutics and CytomX all disclosed stock sales, though insider transactions alone don't explain an index-wide move. What's unresolved is the specific catalyst for the weekly slide — the wire items describe the outcome but not a single triggering event. Whether the selling continues or reverses will depend on how the next week's sessions open.