UNG, the equity ETF symbol that is the largest holder of NG contracts by size, had its symbol halted today, while they issued new units.
The halt lasted longer then expected as the number of new units to be issues is larger then most would expect.
What is interesting is the CFTC is now reviewing USO and UNG for exceeding their limits. In the case of USO, it was over 20% of the front month of the CL market. Market rules are going to have to be adjusted, or changes in how speculation is monitored or controlled is coming.
ETFs have grown larger than expected, and now by the rules of the system, will have to be adjusted for. How that happens is not yet decided.