Lockheed Martin Corp. LMT said late Thursday its board raised its dividend and its authority to buy back stock. The aerospace company said its fourth-quarter dividend of $2.80 a share represents a 7.6% increase and is payable Dec. 27 to shareholders as of Dec.1. The board also authorized an additional $5 billion of share buyback power, raising the company’s total authority to $6 billion. Lockheed Martin shares were up 0.5% after hours, following a 0.7% rise in the regular session to $344.20. Shares have fallen 10% over the past 12 months, compared with a 37% gain on the S&P 500 index SPX.

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