HighCastle is a British online investment marketplace for private securities and other alternative investments. HighCastle enables professional investors to make investments into private companies, hedge funds, bonds, loans, property and variety of other investment opportunities. HighCastle had already been known as a successful investment firm, when most of ICO-fundraising companies was just created. Since its launch in 2016, HighCastle has started offering a wide range of investment products to professional investors globally and serve companies who are seeking equity and debt financing.