Security Token Offering (STO)

A Security Token Offering (STO) is a method of raising capital by issuing blockchain-based tokens that represent a legally recognized security, such as equity, debt, revenue rights, or a share in a real asset. Unlike an initial coin offering, an STO operates within existing securities law. The issuer registers with the relevant regulator or relies on an exemption, and the tokens are treated as regulated financial instruments from day one.

Think of an STO like a traditional stock offering, except the shares live on a blockchain instead of in a broker's clearing system.

What Makes a Token a Security

In the United States, a token qualifies as a security if it passes the Howey Test, established by the Supreme Court in 1946. Under Howey, an investment contract exists when there is an investment of money in a common enterprise with an expectation of profit derived from the efforts of others. Most tokens sold during the ICO era of 2017 to 2018 met this standard and should have been registered as securities.

STOs accept this classification from the outset. The issuer structures the token explicitly as a security and complies with the relevant registration or exemption framework before selling to investors.

Common STO Exemptions in the United States

Most STOs in the United States use SEC exemptions that permit capital raising without full registration. Each exemption has different investor eligibility rules and fundraising caps.

• Regulation D, Rule 506(c): Allows unlimited fundraising from accredited investors only. No investor limit, no SEC review required, but tokens cannot be resold freely for 12 months.
• Regulation A+: Allows fundraising of up to $75 million per year from both accredited and non-accredited investors. Requires SEC qualification and ongoing reporting.
• Regulation S: Exempts securities sold exclusively to non-U.S. investors outside the United States. Often paired with Regulation D for global offerings.
• Regulation Crowdfunding: Allows up to $5 million per year from retail investors through SEC-registered platforms.

How STOs Differ from ICOs

ICOs in 2017 and 2018 typically issued utility tokens with promises of future platform access. Most were unregistered securities sold to retail investors globally. The SEC pursued enforcement actions against dozens of ICO issuers, and many projects returned investor funds or paid civil penalties.

STOs are structured from the beginning to comply with securities law. The offering documents are reviewed by attorneys, investor eligibility is verified, and the tokens are issued on a compliant blockchain infrastructure that enforces transfer restrictions. tZERO, the SEC-registered alternative trading system, provides secondary market trading for STOs that have used its issuance platform.

Real-World Assets Tokenized Through STOs

STOs have been used to tokenize real estate, private equity stakes, debt instruments, and revenue-sharing agreements. The St. Regis Aspen Resort raised $18 million through a Regulation D STO in 2018, tokenizing a 19% ownership stake in the luxury property. That token traded on tZERO's platform, giving investors fractional real estate exposure through a regulated digital security.

Tokenized U.S. Treasury bonds have become one of the fastest-growing real-world asset categories, with total tokenized Treasury value exceeding $3 billion by early 2025, according to data from RWA.xyz.

Sources:
https://www.sec.gov/securities-topics/securities-token-offerings
https://www.sec.gov/smallbusiness/exemptofferings
https://www.tzero.com/