Crossword puzzle clue "stock answers"

How many letters are in the longest answers in this puzzle - or how many of these answers there are

Letter appearing only in down answers; its opposite appears only in across answers

Rumored reason for the stock market plunge of 5/6/10, whose effect is seen in this puzzle's theme answers

Stock answers?

Stock to put stock in

Battery found, in a way, in eight puzzle answers

Event where the number 12 is important, and a feature of 12 two-word answers in this puzzle

"Dog the Bounty Hunter" network, and a hint to the theme in this puzzle's four longest answers