PATTERSON UTI ENERGY INC

Ticker: PTEN CUSIP: 703481101 Class: Common Stock

E. Ohman J:or Asset Management AB's Holding History (CIK: 0002009396)

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

Q1 2010
Shares 900 Value ($000) $13 Avg Close — Range —
Q4 2009
Shares 900 Value ($000) $14 Avg Close — Range —
Q3 2009
Shares 900 Value ($000) $14 Avg Close — Range —
Q2 2009
Shares 900 Value ($000) $12 Avg Close — Range —
Q4 2008
Shares 900 Value ($000) $10 Avg Close — Range —
Q3 2008
Shares 900 Value ($000) $18 Avg Close — Range —
Q2 2008
Shares 900 Value ($000) $32 Avg Close — Range —
Q1 2008
Shares 900 Value ($000) $24 Avg Close — Range —
Q4 2007
Shares 900 Value ($000) $18 Avg Close — Range —
Q3 2007
Shares 900 Value ($000) $20 Avg Close — Range —
Q2 2007
Shares 900 Value ($000) $24 Avg Close — Range —
Q1 2007
Shares 900 Value ($000) $20 Avg Close — Range —
Q4 2006
Shares 900 Value ($000) $21 Avg Close — Range —