Calls Days until expiration: 10
Symbol & Strike Last Chng %Chng High Low Bid Ask Volume Open Int
NAT Feb 20 2010 25.00 — — — — — 2.90 3.40 — —
NAT Feb 20 2010 26.00 2.73 -1.27 -31.75 2.73 2.73 1.95 2.35 1 12
NAT Feb 20 2010 27.00 1.35 -2.33 -63.32 1.35 1.35 1.20 1.45 8 16
NAT Feb 20 2010 28.00 0.70 0.05 7.69 0.70 0.70 0.60 0.75 5 57
NAT Feb 20 2010 29.00 0.25 — — 0.35 0.25 0.20 0.35 137 260
NAT Feb 20 2010 30.00 0.10 -0.05 -33.33 0.10 0.10 0.05 0.15 71 710
NAT Feb 20 2010 31.00 0.05 — — 0.10 0.05 0.05 0.10 13 756
NAT Feb 20 2010 32.00 0.05 — — 0.05 0.05 0.05 0.05 44 1,176
NAT Feb 20 2010 33.00 0.04 -0.01 -20.00 0.04 0.04 0.05 0.05 3 666
NAT Feb 20 2010 34.00 0.05 — — 0.05 0.05 0.05 0.05 15 602
NAT Feb 20 2010 35.00 0.05 — — 0.05 0.05 0.05 0.05 15 916
NAT Feb 20 2010 36.00 0.10 -0.05 -33.33 0.10 0.10 0.05 0.05 66 141
NAT Feb 20 2010 37.00 0.05 -0.05 -50.00 0.05 0.05 0.05 0.05 4 315
Puts Bold and highlighted options are "At the Money"
Symbol & Strike Last Chng %Chng High Low Bid Ask Volume Open Int
NAT Feb 20 2010 25.00 0.10 0.05 100.00 0.10 0.05 0.05 0.10 60 60
NAT Feb 20 2010 26.00 0.15 0.05 50.00 0.15 0.15 0.05 0.15 21 84
NAT Feb 20 2010 27.00 0.30 -0.20 -40.00 0.30 0.30 0.25 0.40 6 367
NAT Feb 20 2010 28.00 0.75 0.10 15.38 0.75 0.70 0.65 0.85 14 227
NAT Feb 20 2010 29.00 1.50 0.25 20.00 1.50 1.50 1.30 1.50 2 1,097
NAT Feb 20 2010 30.00 2.00 -0.35 -14.89 2.00 2.00 2.00 2.30 10 951
NAT Feb 20 2010 31.00 3.15 0.15 5.00 3.40 3.15 2.85 3.40 17 309
NAT Feb 20 2010 32.00 4.00 0.30 8.11 4.00 4.00 3.80 4.40 2 500
NAT Feb 20 2010 33.00 5.15 0.05 0.98 5.15 5.15 4.80 5.40 1 561
NAT Feb 20 2010 34.00 4.50 0.90 25.00 4.50 4.50 5.80 6.40 10 162
NAT Feb 20 2010 35.00 5.70 -0.50 -8.06 5.70 5.70 6.70 7.40 1 176
NAT Feb 20 2010 36.00 2.90 -0.60 -17.14 2.90 2.90 7.70 8.40 — 53
NAT Feb 20 2010 37.00 4.50 0.60 15.38 4.50 4.50 8.70 9.50 20 114
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