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Is there such a thing as “stock insurance”?
Yes, you can insure against the fall in price of stock by purchasing a put option.  You pay for a put and if the price of the share falls below the "strike price" of the put, then you can exercise the put.  On exercise, the person who sold you the put contract agrees to buy the stock for the strike price, even though that strike price is higher than the market price.  You can adjust the level of insurance by buying put options at higher or lower prices, or buying fewer put options than shares you own (leaving some shares uninsured). Alternatively, you can minimize your risk exposure by investing in an index or other fund, which gives you partial ownership in a large number of shares.  That means on any given day, lots of shares do worse and lots of shares do better.  You can reduce the need for insurance by purchasing a lower-risk, lower-growth financial product.