BUZZ-AltaGas Ltd: Stock offering priced at discount
** The midstream energy company's shares down 2.61 pct at C$51.52
** To issue 7.85 mln shares at C$51 each
** Offering is about 6.35 pct of outstanding stock and is priced at a 3.6 pct discount to stock's Tuesday close
** To use part of C$400 mln proceeds to fund a gas supply deal with Painted Pony Petroleum Ltd
** AltaGas stock closed up 1.9 pct on Tuesday after the company announced the deal with Painted Pony
** Including Tuesday's gains, the stock has closed up for six straight trading sessions
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