Massachusetts Financial Services Co. said that so far this year gross sales in its bank trust channel have increased 30% from a year earlier, and a company executive said that he thinks the Boston investment management company will be able to match that performance in the channel next year even while it struggles with overall losses.

The mutual fund and separately managed account provider, which does business as MFS Investment Management and is majority owned by Toronto's Sun Life Financial Inc., said that its assets under management declined 21% from a year earlier, to $162 billion as of Sept. 30.

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