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Bats Blaming Market Rules as Calls of Overhaul Grow

Bats Global Markets Inc., the stock exchange operator that acknowledged four years of trading errors, blamed the mistakes on regulations it says are too complex.

The rule violations at Bats, which canceled its initial public offering last year after its own computer systems kept the stock from trading, threaten to further erode confidence in U.S. stock exchanges. Operators including NYSE Euronext have called for an overhaul of regulations that boosted high-speed trading and the fragmentation of equity markets to 13 stock exchanges and about 50 private broker-run dark pools from three dominant venues in the 1990s.