(CNBC) — U.S. stocks were little changed on Tuesday, with the S&P 500 hating its record-smashing run, as investors considered valuations.
Tyson Foods slid after the poultry producer drew a downgrade to underperform from neutral by Credit Suisse; Allergan shares dropped after the Botox maker spurned a revised, unsolicited offer from Valeant Pharmaceuticals International. Apple fluctuated after Irish state broadcaster RTE reported the European Commission would launch a formal probe on Wednesday into the iPhone maker's tax arrangements in Ireland.
"It's a catalyst-light day, but we've been up 11 out of the last 13 days," said Art Hogan, chief market strategist at Wunderlich Securities.
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