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Founded 2016
Headquarters New York
Key People Saum Noursalehi, CEO
Employees 100
Products security tokens

tZERO (or t0) is a distributed ledger platform for capital markets. It is a majority owned subsidiary of called Medici Ventures. The company's stated goal is to bring greater efficiency and transparency to capital markets through the integration of blockchain technology. tZERO is also the name of the company's security token launched in late January 2019.[1]


On June 5, 2015, Overstock announced it would offer the “world's first cryptosecurity,” on its new t0 platform. The name t0 comes from the Wall Street jargon for bond settlements, which typically take three days (“t + 3”) to finalize. According to company statements, bond trades on t0 settle the same day.[2]

t0 had its first day of stock trading on its shared ledger on December 16, 2016.

The previous day, Overstock announced it had raised $10.9m in an offering comprising $1.9m worth of stock traded via digital assets on the t0 platform. Fifty-five people purchased a total of 126,565 shares for $15.68. [3]

In January of 2017, t0 acquired the assets of Singapore-based Blue Ocean Financial Technology, Pte. Ltd. and formed Blue Ocean Technologies to offer a transparent, electronic marketplace for trading U.S.-listed securities during non-U.S. trading hours.[4]

In April 2018, tZERO launched the first demo videos of its trading software.[5]

In May 2018, the company announced that CEO Patrick Byrne would be stepping down as CEO to become tZERO's executive chairman, while former president Saum Noursalehi would take over as CEO, in order to "accelerate" tZERO.[6]

On May 18, 2018, tZERO and BOX Digital Markets LLC entered into a letter of intent to form an exchange to list and publicly trade security tokens for companies that issue, or convert existing stock to, security tokens. Lisa Fall, CEO of BOX Digital and president of BOX Options Exchange LLC, will be the CEO of the joint venture. The venture aims to be the first SEC-registered exchange for security tokens, tentatively set for Q3 2019, pending regulatory approval. [7][8]

In August 2018, the firm concluded its first token sale of tZERO security tokens, and the lock-up period for those ended in January 2019. That essentially opened the token trading platform for live trading.[9]

Products and Services

tZERO's ICO launched in December of 2017.[10] It currently offers security tokens to "accredited investors only."[11][12]

tZERO's most distinctive function is DLR technology (Digital Locate Receipt), which uses a proprietary blockchain to lend transparency to the practice of short selling. The aim of this technology is to curb "naked" short selling.[13][14]

Key People

  • Saum Noursalehi, CEO
  • Steve Hopkins, CRO
  • Ralph Daiuto, Jr., COO
  • Patrick Byrne, founder and chairman


  1. Distributed ledger platform for capital markets. t0.
  2. Overstock's t0: Reconciling Fiat Currency and the Bitcoin Blockchain. Nasdaq.
  3. Overstock Just Closed its First Day of Blockchain Stock Trading. t0.
  4. t0 acquires assets of Blue Ocean Financial Technology, Pte. Ltd.. Globe Newswire.
  5. tZERO Unveils Security Token Trading Software. BusinessWire.
  6. BRIEF-Overstock.Com CEO Announces Management Changes To Accelerate tZERO. Reuters.
  7. tZERO and BOX Digital Markets Announce Joint Venture to Launch Industry’s First Security Token Exchange. Press Release via Businesswire.
  8. Blockchain Beyond Crypto: A Conversation with tZERO’s CEO Saum Noursalehi. Trade Technologies: Trade Talk Blog.
  9. Overstock’s Patrick Byrne Says tZERO Will Launch Next Week. Coindesk.
  10. tZERO Announces Launch Date and Initial Terms for its Proposed Token Sale. BusinessWire.
  11. Online retailer Overstock has raised $100 million for its ICO it says will replace Wall Street. Business Insider.
  12. Distributed ledger platform for capital markets. t0.
  13. Digital Locate Receipt Technology Platform. tZERO.
  14. Overstock to Release Blockchain Product to Curb Naked Short Sales. Coindesk.