It has also garnered dozens of celebrity supporters, including Leonardo DiCaprio, Bo Derek, Yao Ming, Scarlett Johansson, Megan Fox, Edward Norton and Paul Rudd.

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"I think what it showed was the manual capacity isn't there anymore, " said Edward Ditmire, an analyst at Fox-Pitt Kelton.

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Madonna has cast James Fox and his son Laurence Fox in her film about Edward VIII's wife, Wallis Simpson.

BBC: Madonna casts Fox family for Wallis Simpson film

NYSE's Arca electronic trading system is known to have higher pricing than even Nasdaq, analysts said, and is seen as vulnerable to the attack from BATS. Arca charges 10 cents per 100 shares on a round trip, according to Fox-Pitt Kelton analyst Edward Ditmire.

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"On the busiest days there is a premium put on speed, " says Edward Ditmire, an analyst who covers the markets at Fox-Pitt Kelton.

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James Fox will play King George V, while Laurence Fox has been cast as his son Bertie, Edward's younger brother.

BBC: Madonna casts Fox family for Wallis Simpson film