In a class action spanning nearly 20 years, Ontario’s Superior Court of Justice has found two mutual fund managers liable for negligence related to “market timing”. Justice Koehnen held in Fisher v. IG Investment that the mutual fund managers failed to take reasonable steps to prevent frequent, short-term trading in their funds that harmed long-term investors. The mutual fund managers did not, however, breach their fiduciary duties. This decision offers important takeaways concerning class proceedings,…