[BRIEFING.COM] The S&P 500 (-0.17%) is in second place on Monday afternoon, down now about 10 points.
Briefly, S&P 500 constituents Dexcom (DXCM 76.91, -5.35, -6.50%), Moderna (MRNA 25.81, -1.31, -4.83%) and CSX (CSX 32.89, -1.69, -4.89%) pepper the bottom of the standings. DXCM is down due in part to broad sector weakness in diabetes/insulin names (Tandem (TNDM 12.15, +0.22, +1.84%), Insulet (PODD 329.61, -1.16, -0.35%) also lower), while CSX slides as Warren Buffett's comments ruling out a rail acquisition, coupled with last week's CSX-BNSF partnership, deflate investor hopes for a takeover premium that had recently buoyed the stock.
Meanwhile, Western Digital (WDC 79.66, +2.69, +3.49%) is outperforming alongside peer Seagate (STX 164.35, +5.14, +3.23%) despite a dearth of corporate news.