London Stock Exchange plans to begin single-stock options trading next month. Options clearinghouse OCC plans to undo dividend-linked options trading, something that has been popular on Nasdaq’s option-trading platform. NYSE Euronext opens the door and turns on the lights at Enternext, its new small-to-medium company trading venue.

A group of investment firms sue the CBOE, alleging improper fee assessment over a multi-year period. FINRA extends a new regulatory reach to stock trading platforms catering to high-frequency traders, and takes a closer look at dark pools. After earning jeers and criticism in 2008, credit rating agencies are taking fresh damage for their mis-estimation of the US housing market.

Police in Hong Kong are taking a closer look at potential financial irregularities at the recently-shuttered Hong Kong Mercantile Exchange. The ICE-NYSE merger has formally been submitted to the EU for testing and, they hope, approval. ICE Endex and the European Energy Exchange face off over an expanding market in Turkey.

The CFTC is sifting through a mountain of email in its search for ISDAfix rate manipulation, hopefully at a rate of more than a few hundred a day. The head of Colombia’s stock exchange says the country’s financial markets are due for a spruce-up to attract foreign investment. In the wake of Bloomberg’s recent trouble with cross-department information sharing, competitors look into creating replacement financial chat systems.