Los Angeles-based Spark Networks Inc. was this week’s biggest mover, gaining 25 percent to end at $1.82. West Los Angeles-based Marathon Patent Group was also among the week’s big movers. The patent asset acquisition group gained 15 percent to end at $3.10. Mailing and shipping company Stamps.com was the week’s biggest loser, dropping 13 percent to end at $74.72.

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