I used to own many mutual funds in my account at TD Canada Trust. A glance at an old statement shows that at one time, I owned the following funds in the Canadian portion of my portfolio:
What is wrong with being invested in so many funds at once? The problem is that with 4 funds, primarily large-cap funds, I was over-diversifying and basically forming an index for myself. I was owning the entire market, which is what indexes do anyways, and diluting the active management within each of the funds. But I was not paying what I should have been paying for an index (MER <= 0.25%). These funds have MERs of at least 2%, except for the index fund. So basically I was buying the equivalent of an index, but paying through the nose for it. The effect of a high MER eating into your returns every year can be huge. Don't make the same mistake I made. Get an index for the large-caps, and no more than one other large cap fund. Perhaps owning an actively-managed small-cap fund as well. If I had to do it again at TD, I would have bought TD Canadian Index Fund and TD Canadian Small Cap Equity. The other large-cap funds (TD Canadian Equity, TD Canadian Dividend, and TD Blue Chip Equity) are not significantly better than the indexes themselves, so I would rather take the low-cost index fund. The small-cap fund gives me some exposure to smaller companies which are not owned by the index.