National indices fell an average of 1.5 percent March 31 while tri-county stocks managed to stay predominantly in the green. Simi Valley-based tape drive manufacturer Qualstar soared 13.5 percent, closing at $2.61. Goleta-based digital filter maker Resonant had an 8.8 percent gain to end at $1.48 after major losses on March 30. Westlake Village-based PennyMac…
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