Crossing the threshold triggers the SEC's filing requirements, even if a company's shares don't trade publicly.

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"Crossing the threshold to active combat was an important psychological moment, " Dr Stelzenmueller said.

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"The U.S. is just crossing the threshold to commercial viability, " says Ezra Green, chief executive of Clear Skies Solar.

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The Russell Street Cinema is so magically 1980s that crossing the threshold will instantly transform your iPhone into a Sony Walkman.

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By crossing the 30% threshold Bayer was obliged to make a new offer for Schering at a market price.

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The medicare tax is 2.9% (equally split between employer and employee in the case of wages) although it goes to 3.8% after crossing a threshold.

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