Peter Moody has ended the Sydney autumn carnival on a high but admits the ongoing cobalt investigation has taken a toll on his business.

The Moody stable won the final two Group One races of the autumn at Randwick on Saturday with Pasadena Girl taking out the Champagne Stakes and Dissident the All Aged Stakes.

Moody's other runner on the day, Hi World, won the Group Three Frank Packer Plate.

The trainer is one of four in Victoria named in January as having horses with higher than allowed levels of cobalt.

In Moody's case, it relates to a swab taken from Lidari after he ran second in the Turnbull Stakes in October.

No trainer has been charged as the investigation continues.

"I haven't heard anything for a long time. I really have no understanding of the drug and can't explain it," Moody told Sky Sports Radio.

"It's very negative for business, particularly at this time of year with the yearling sales.

"I have to go out and put my own (money) on the line because I haven't got people knocking on the door wanting to invest in the stable, or not to the degree they usually are.

"I have bought my own stock. Most of that is sitting on the rack.

"Mrs S A Moody will be racing most of those."

Moody said the one good thing to come out of the cobalt saga was that Racing NSW stewards tested a stored sample from Black Caviar which was clear.

"I am grateful that Ray Murrihy did that to protect her reputation," he said.

Moody came away from the Sydney carnival with three Group One victories, the other going to Plucky Belle in the Coolmore Classic.

Dissident now heads to Newgate Farm where he will stand in the spring as a five-time Group One winner.

His four Group One wins this season have strengthened his claims as the Horse of the Year.