The deal gives SoftBank a stake of just under 10% in the Manchester-based company formerly known as The Hut Group, and an option to invest a further $1.6 billion into THG's technology armTHG Ingenuity.
THG owns beauty retailer Lookfantastic, makeup brand Illamasqua and beauty box service Glossybox, as well as supplements firm Myprotein. THG said it would use the money to "execute an advanced pipeline of strategic M&A".
The equity placing was priced at 596 pence per share and was oversubscribed, with THG raising a total of $320 million from other investors. THG shares were up 12.7% at 0828 GMT on Tuesday, having risen as much as 19%.
The cash injection comes less than a year after THG's London listing when it raised 1.88 billion pounds ($2.65 billion)selling shares at 500 pence each.
THG also announced it agreed to buy Bentley Laboratories LLC, a New Jersey-based prestige beauty developer and manufacturer, for $255 million. This is the latest in a number of deals THG has made since listing, including U.S. skincare brands Perricone and Dermstore.com.
THG said it plans to spin THG Ingenuity, which provides e-commerce services to other companies, into a separate company within the next 15 months. After that SoftBank would then be able to exercise its option to invest in that business.
If SoftBank exercises its option to invest $1.6 bln in that division, it would give the Japanese technology conglomerate a 19.9% interest in THG Ingenuity at a valuation of $6.3 billion.
($1 = 0.7087 pounds)
Our Standards: The Thomson Reuters Trust Principles.