BUZZ-PHH Corp: Adds to share buyback program
** Mortgage lending and car leasing company's shares up nearly 17.4 pct at $17.11 - its biggest intra-day gain
** Company to start share repurchases of up to $100 mln and also to extend its prior authorization for up to $250 mln
** Reports Q3 core loss per share of 61 cents, compared with a loss of $1.19 a year earlier
** More than 1.2 mln shares traded, nearly twice their 25-day moving avg
** Up to Thursday's close, stock had fallen 39 pct this year
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