Share 
Bonus TL;DR
- ARK Invest has aggressively backed the U.S. prediction market sector, purchasing 126,594 private-market shares of Kalshi across three of its actively managed ETFs (ARKK, ARKW, and ARKF).
- CEO Cathie Wood publicly praised the exchange’s leadership, positioning the private-market buy as a strategic entry into an event-contract industry that Ark analysts estimate could reach a medium-term annual volume of $1 trillion to $5 trillion despite looming regulatory challenges.
ARK Invest bought 126,594 shares of prediction market platform Kalshi from private markets on Sept. 18, as CEO Cathie Wood publicly praised the company’s leadership and highlighted what Ark sees as a $1 trillion to $5 trillion medium-term market opportunity.
The purchase matters because it signals fresh institutional backing for a U.S. prediction markets operator at a time when the sector is drawing more attention from investors, competitors, and policymakers. Ark also said Kalshi is already handling more than 90% of U.S. activity, while warning that legal and competitive risks could still pressure the business.
Ark spread the Kalshi purchase across three ETFs
According to the source report, Ark bought Kalshi shares directly in private markets for three actively managed funds.
The allocations were:
- 90,024 shares for the ARK Innovation ETF
- 25,318 shares for the ARK Next Generation Internet ETF
- 11,252 shares for the ARK Fintech Innovation ETF
That brought the total to 126,594 shares.
Wood said on X that Kalshi’s management team is “phenomenal” and that the company is “skating to where the prediction markets puck will be.” In a separate Oct. 1 post cited by the report, she wrote: “We are very happy to have introduced another private company, Kalshi, to our ETF strategies. To me, Kalshi’s management team is phenomenal, as it is skating to where the prediction markets puck will be.”
The source report did not disclose the terms of the private-market purchases or provide a valuation for Kalshi tied to the transaction.
Why Ark sees a large opportunity, and what could get in the way
Ark analyst Nick Grous estimated the medium-term prediction market opportunity at $1 trillion to $5 trillion in annual notional volume.
That is the core thesis behind the investment, though the source also pointed to several risks. Those include state-level legal challenges, competition from Robinhood, and possible pressure on take rates as the market develops.
For readers tracking the funds involved, the source said the ARK Innovation ETF had $5.56 billion in assets under management as of July 31, 2026, with a 0.75% expense ratio. The ARK Next Generation Internet ETF had $1.61 billion in assets at the end of July and a 0.76% expense ratio, while the ARK Fintech Innovation ETF had $700.80 million in assets and a 0.75% expense ratio.
What comes next is less clear. The report did not say whether Ark plans additional Kalshi purchases, and it did not provide more detail on the state-level legal challenges it referenced. But the trade adds a high-profile institutional vote of confidence to a U.S. prediction markets sector that is still facing regulatory and competitive pressure as it grows.
Source: As reported by Radhika Anilkumar Nadig.
