Who Owns Polymarket? Shayne Coplan, ICE and the Cap Table in 2026

Who owns Polymarket? It's a private company owned by its founder and CEO, Shayne Coplan, together with a group of outside investors. The largest disclosed outside shareholder is Intercontinental Exchange (ICE), the company that owns the New York Stock Exchange, which reported holding about 22% of Polymarket's outstanding shares as of June 30, 2026.

No single investor is known to own a majority. Coplan's own stake has never been publicly disclosed, so anyone quoting an exact percentage for him is guessing.

The company behind the name

The legal entity is Blockratize, Inc., a Delaware company that does business as Polymarket. Coplan launched the platform in 2020 as a crypto-based prediction market, where users trade on the outcome of events such as elections, sports and economic data.

Polymarket also owns a US-regulated arm. In July 2025 it paid $112 million for QCEX, a Florida-based derivatives exchange and clearinghouse licensed by the Commodity Futures Trading Commission (CFTC).

That deal gave Polymarket a legal route back to American users, three and a half years after a 2022 CFTC settlement in which it paid a $1.4 million penalty and agreed to block US customers.

Who owns Polymarket: the known shareholders

Here's what can be said about each owner, along with how solid the information is.

Owner	What's known	How reliable
Shayne Coplan	Founder and CEO since 2020; stake undisclosed	Role confirmed; stake size unknown
Intercontinental Exchange (ICE)	About 22% of outstanding shares, 14% fully diluted (June 30, 2026)	Confirmed in ICE's SEC filings
1789 Capital	About $200 million invested earlier, leading a reported $1 billion round with about $300 million more	Confirmed by a 1789 Capital spokesperson to reporters; round status still developing
Founders Fund	Early investor, participating in the latest round per Bloomberg	Widely reported; stake undisclosed
D.E. Shaw and G Squared	Joined the April 2026 round at about a $15 billion valuation	Reported by financial media; stakes undisclosed
Other venture backers	General Catalyst, Polychain Capital, Dragonfly and others are named across funding reports	Reported; stakes undisclosed

The pattern is clear. Only one shareholder, ICE, has published hard ownership numbers, and it did so because it's a public company that has to report material investments to the SEC.

How much of Polymarket does ICE own?

You'll see ICE's stake described as $2 billion, $1.6 billion, 22%, 23% and 14%. They're mostly all correct, because they measure different things.

The cash. ICE agreed on October 7, 2025, to buy 9.6 million Series D preferred shares for $1.0 billion. On March 26, 2026, it invested another $600 million for about 4.2 million Series E preferred shares.

That's $1.6 billion of direct investment, plus a tender offer for roughly $40 million of common stock from existing holders, which brings the total close to $1.64 billion. The "up to $2 billion" figure from the original October 2025 announcement was a ceiling, not the amount actually spent.

The book value. ICE's quarterly report for the period ending June 30, 2026 puts the carrying value of its Series D and E preferred shares at about $2.0 billion. That figure is higher than the cash paid because ICE marked the earlier stake up when the later round was priced higher.

The percentages. The same filing says those preferred shares represent about 22% of Polymarket's outstanding shares and about 14% on a fully diluted basis.

The gap exists because "fully diluted" counts stock options, warrants and other securities that could become shares later. As of March 31, 2026, ICE reported 23% and 14%, so the outstanding figure has edged down slightly since.

Which number should you use? For "how much of Polymarket does ICE own," the fully diluted 14% is the more conservative answer, and 22% is the share of stock actually issued today. Both come from the same official filing.

Here's a rough calculation to put that in perspective. If ICE's 14% fully diluted stake were valued at the reported $21 billion price, it would be worth roughly $2.9 billion on paper.

That's only an illustration. The new round would dilute ICE somewhat, and preferred shares carry special rights, so a simple percentage-times-valuation figure isn't the same as what ICE could actually sell its stake for.

Does Shayne Coplan still control Polymarket?

Coplan runs the company as CEO and is widely described as a major shareholder, but the size of his stake isn't public. Owning a large stake and having full control aren't the same thing, either.

ICE's preferred shares come with voting rights equal to the common shares they convert into, and the filings describe protections such as liquidation preferences and anti-dilution terms. Large investors in private companies also often have board or approval rights, though the full terms for Polymarket haven't been published.

That investor influence has become visible. Bloomberg reported on October 20, 2026, that ICE and Founders Fund were pushing for stronger financial controls and the appointment of a chief financial officer as conditions tied to their participation in the new round. We haven't seen Polymarket respond publicly to those specific points, so treat them as reported, not confirmed.

Where Donald Trump Jr. fits in

Donald Trump Jr. is a partner at 1789 Capital, the venture firm leading Polymarket's latest round, and he also advises Polymarket. According to a 1789 Capital spokesperson quoted by CoinDesk and others, the firm is putting in about $300 million on top of roughly $200 million it had already invested.

That makes 1789 Capital a meaningful investor, but there's no public evidence that it, or Trump Jr. personally, owns a controlling stake. Even at $500 million invested, 1789's holding would be a minority position in a company valued at $21 billion, and its exact percentage depends on the prices it paid in each round, which aren't public.

How Polymarket's valuation has changed

The reported numbers show how fast the company's price has moved:

Date	Event	Reported valuation
Mid-2025	$200 million round	About $1 billion
October 2025	ICE's first investment	About $9 billion post-money
April 2026	Round including ICE, D.E. Shaw and G Squared	About $15 billion
August/September 2026	1789 Capital-led round of about $1 billion	About $21 billion (reported as still being raised in October)

Rival Kalshi has been reported at a higher valuation in its own fundraising, which is one reason these figures keep moving. For a wider view of why investors are piling into this category, see our piece on what startups can learn from prediction market apps.

Can you buy shares in Polymarket?

Not directly. Polymarket isn't listed on any stock exchange, and there's no Polymarket token that represents equity. ICE's filings note that its preferred shares would convert to common stock in a qualifying IPO or direct listing, but that's a standard term, not an announced plan.

The only public-market exposure is indirect: ICE trades on the NYSE, and Polymarket is a small part of its much larger business. Some private platforms offer pre-IPO shares to accredited investors, but those deals carry high fees, limited information and real liquidity risk.

If you're comparing Polymarket with traditional betting companies, the ownership picture is very different from a listed sportsbook like DraftKings, which we break down in who owns DraftKings.

What this means

Polymarket belongs to Shayne Coplan and a set of investors, with ICE as the largest disclosed shareholder at about 22% of outstanding shares and 14% fully diluted. Everyone else's percentage, including Coplan's, is undisclosed. If a page gives you precise figures for Coplan, Founders Fund or 1789 Capital, ask where they came from, because no filing we found supports them.