The UK’s ARM Holdings will trade as ARMHY when Morgan Stanley Dean Witter unloads 5.885 million American Depository Receipts today, Tuesday, priced somewhere between $16.24 and $19.24. It’s not clear how many shares each receipt will represent but unconditional trading will reportedly not begin until Thursday 16 by which time, as usual, the ordinary investor will have missed out on what’s likely to be a steep hike in the price of the stock.