Traders work on the floor of the New York Stock Exchange on March 17, 2020. Lucas Jackson/Reuters US stocks fluctuated after disappointing labor-market data drove up Treasury yields and sparked valuation concerns.The US added 117,000 private payrolls in February, ADP said, well below the 200,000 expected.The report and the jump in yields offset optimism about COVID-19 vaccine availability in the US.Sign up here for our daily newsletter, 10 Things Before the Opening Bell.US equities traded mixed on Wednesday as rising Treasury yields offset stimulus optimism.Early strength across stock sectors faded after ADP's monthly employment report showed February job growth missing expectations.