Security Token Offering (STO)

A Security Token Offering raises capital by selling security tokens that carry legal rights such as equity, profit share, or a debt claim, rather than just future access to a product or network. Because these tokens meet the legal definition of a security, often measured against the Howey Test in the United States, issuers must register the offering or rely on a recognized exemption before selling to investors.

In the US, most STOs proceed under Regulation D (private placements to accredited investors, sometimes with a one-year resale lockup), Regulation S (offshore sales to non-US persons), or Regulation A+ (which allows raises of up to $75 million from both retail and accredited investors, backed by SEC-qualified disclosures). In the EU and other jurisdictions, ordinary securities law typically applies to these tokens rather than the lighter rules built for crypto-assets, since a regulated security token generally falls outside frameworks designed for utility tokens.

Real-world STOs illustrate the model: tZERO, a subsidiary of Overstock.com, raised roughly $134 million in 2018; INX Limited completed an SEC-registered offering raising about $85 million in 2021, with token holders entitled to a share of company revenue; and Blockchain Capital's 2017 BCAP token gave investors indirect exposure to a venture fund. Unlike an Initial Coin Offering, which historically sold tokens with little legal vetting, an STO builds compliance, investor accreditation checks, and often trading restrictions into the process from the outset.

The tradeoff is cost and speed: legal, audit, and KYC/AML obligations make STOs slower and pricier to launch than ICOs, but they give investors clearer legal recourse and reduce the issuer's regulatory risk.