Austin-based Ambiq Micro closed up ~61% in its NYSE debut, after raising $96M in an upsized IPO, giving the maker of ultra-low power chips a $680M market value (Anthony Hughes/Bloomberg)

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Anthony Hughes / Bloomberg:Austin-based Ambiq Micro closed up ~61% in its NYSE debut, after raising $96M in an upsized IPO, giving the maker of ultra-low power chips a $680M market value  —  Ambiq Micro Inc. shares rose 61% in their first trading day, after the maker of ultra-low power semiconductors …