A practice called market timing cost mutual fund investors enough to sustain a twenty-year lawsuit, and a court has now put a number on it: more than $170 million. Market timing is when traders rapidly move money in and out of mutual fund units to exploit a lag between the fund's published price and the actual value of its underlying holdings. Long-term investors absorb the dilution quietly, usually without knowing it, which is part of why this kind of harm is hard to see until someone adds it up across thousands of accounts.
What the court ordered
On July 16, 2026, Justice Marcus Koehnen of the Ontario Superior Court of Justice ordered CI Mutual Funds Inc. and AIC Limited to pay damages and interest exceeding $170 million to Class Members. The case is called the Market Timing class action. It was commenced in 2006. That is twenty years between filing and a damages ruling, a timeline that reflects how long it takes to reconstruct trading patterns across a large investor base and build a damages model the court accepts.
How the harm works
Mutual funds are priced once per day, typically at market close. A trader who knows that a fund's afternoon price has not yet caught up to a morning move in its underlying assets can buy cheap and sell the next day at the corrected price. The profit is real. The cost dilutes the fund's per-unit value for every investor holding shares that day.
Each individual loss looks small in isolation. Across thousands of holders over an extended period, it accumulates. A class action is the legal structure that makes this kind of dispersed harm actionable. It consolidates the claims of many Class Members into a single proceeding, so plaintiffs can collectively pursue losses that no single investor could justify litigating alone.
What is confirmed and what remains open
The July 16 ruling specifies damages and interest, with the combined total exceeding $170 million. The announcement does not detail how that figure is divided between CI Mutual Funds Inc. and AIC Limited. Payment timing and any appeal were also not addressed. The case was filed in 2006. The order was issued July 16, 2026.