BUZZ — Amaero ticks up in Nasdaq debut after $20 million US IPO
* Shares of Amaero, a US-based producer of high-value refractory and titanium alloy spherical metal powders, rise 1.7% to $4.32 in Nasdaq debut after $20 million US IPO * Stock opened at $4.10 apiece vs $4.25 IPO price, valuing the firm at $117 million * AMRO sold 4.7 million shares in the IPO, which was last month pos