As per your experience in mutual funds investing, it's good to know that your mid-cap MF investment is performing well, and you are planning to invest more in the mid-cap MF. But before taking any decision, you must do proper research. You should know that large-cap MFs provide stability to investors. As the companies are well-established, their share price doesn't show a sharp increase or decrease. These MFs also provide a long history of the balance sheet, which can show the profits when the company made the market.