BlackRock Investment Institute Senior Investment Strategist Ann-Katrin Petersen says the outperformance of the Russell 2000 index of small-cap stocks will fade. "We are observing that 40% of earnings are currently contracting," Petersen said on Bloomberg Television, Thursday. "This rally of the past days could lose some steam." Petersen also discusses the outlook for Treasuries, saying BlackRock is "neutrally positioned."