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Why can't you just have someone invest for you and split the profits (and losses) with him?
What you are looking for is a pretty terrible deal for you, so I'd say it doesn't exist because there isn't a market for it, or nobody has noticed there is a market for it. In principle I would happily take the deal you offer from as many people as would let me, put the money into treasury bills, and take half the profits while doing pretty much nothing.    If I had more risk tolerance I would be pretty happy to have half the value of my "fund" as zero cost investment capital for more aggressive investments.  My business would then be a lot like an insurance company without the hassle of selling insurance to get hold of float to invest.  Also, most insurance companies actually lose money on policies, but come out ahead by investing the float, so an insurance company with zero cost float is quite a good business. Another answer mentions Berkshire Hathaway.  If you read one of the famous Berkshire Hathaway annual letters to shareholders and read the section about insurance you'll see that very low cost float has a large role in that company's success. So, back to your end of the deal: if the deal is that good for me, how good is it for you?  I'd have to double market returns just for you to break even.  If you're smart enough to pick a financial adviser that can beat the market by that much, how come you aren't able to pick an investment strategy that ties the market?