Stocks showed modest improvement in the two-week period ended Nov. 25. The Dow gained 1.2 percent, but the Valley 50 couldn’t keep pace with only a 0.3 percent increase. Auto leasing software developer NetSol Technologies Inc. was once again the top gainer with an increase of 15 percent on heavier-than-average trading volume. Among the highest losses was Apollo Medical Holdings Inc. with a 24 percent decrease even after posting positive earnings and revenue for the fiscal second quarter. Joining the Valley 50 was Second Sight Medical Products Inc. which closed its first day of trading on Nov. 19 up 122 percent.