Private company
Who owns Blockratize, Inc. (Polymarket), Series D and E Preferred Stock
One company in the researched set discloses a stake in Blockratize, Inc. (Polymarket), Series D and E Preferred Stock, worth $2.00bn between them. Blockratize, Inc. (Polymarket), Series D and E Preferred Stock is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
Blockratize, Inc. (Polymarket), Series D and E Preferred Stock - Profile
- Type
- private company
- Based in
- United States
- Founded
- 2020
Blockratize, Inc. trades as Polymarket and runs the largest prediction market by volume, a venue where people take positions on the outcome of future events in politics, sport, economics and culture by buying shares that pay one dollar if the outcome happens and nothing if it does not, with trades matched peer to peer through smart contracts. It was founded in 2020 by Shayne Coplan and is based in New York. The Commodity Futures Trading Commission fined the company 1.4 million dollars in January 2022 for running off exchange event based binary options without the required exchange registration and ordered non compliant markets closed. Polymarket bought the CFTC licensed exchange and clearing house QCEX for 112 million dollars in July 2025 and now runs a regulated United States venue as well as its global platform, and distributes its event probability data to institutional customers through Intercontinental Exchange.
Source
Blockratize, Inc. (Polymarket), Series D and E Preferred Stock files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from ICE Announces Strategic Investment in Polymarket (Intercontinental Exchange investor relations), CFTC Orders Event-Based Binary Options Markets Operator to Pay $1.4 Million Penalty (CFTC press release 8478-22) and Polymarket Acquires CFTC-Licensed Exchange and Clearinghouse QCEX for $112 Million (PR Newswire). The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- Intercontinental Exchange, Inc., as of 30 Jun 2026. Series D and E are preferred, not common, shares, so the 'shares' field is left null per the rule that non-common-class interests get shares:null with the real quantity recorded here instead. On 7 Oct 2025 ICE agreed to purchase 9.6 million shares of Series D Preferred Stock of Blockratize, Inc. (d/b/a Polymarket) for $1.0 billion (6% non-cumulative dividend, convertible to common at ICE's option or mandatorily on a qualified IPO/direct listing, right to nominate/elect one board member). On 26 Mar 2026 ICE invested an additional $600 million for approximately 4.2 million shares of Series E Preferred Stock (substantially similar rights). Q2 2026 10-Q: 'As of June 30, 2026, the total carrying value of our Series D and E Preferred Stock investments was approximately $2.0 billion and represented approximately 22% and 14% ownership of the outstanding and fully diluted shares of Polymarket, respectively.' Series D/E do not qualify for equity method accounting (not in-substance common stock under ASC 323), so they are carried as 'equity investments without readily determinable fair values' at cost, adjusted for observable price changes. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Blockratize, Inc. (Polymarket), Series D and E Preferred Stock where a holder stated one, and are missing where no holder did.