U S SILICA HLDGS INC

CUSIP: 90346E103 Class: Common Stock

NEXT CENTURY GROWTH INVESTORS LLC's Holding History (CIK: 0001134007)

Note: Option positions (PUT/CALL) are excluded.

Q4 2014
Shares 613 Value ($000) $15 Avg Close — Range —
Q3 2014
Shares 444 Value ($000) $27 Avg Close — Range —