ARK Invest-backed Quantum Solutions has become the largest Ether digital asset treasury (DAT) outside the United States after purchasing $9 million worth of ETH in just one week.
Founder Francis Zhou announced the latest acquisition on Thursday, stating:
“I’m proud to share that we have accumulated 2,365 ETH in only seven days, officially making Quantum Solutions the largest ETH DAT outside the US.”
He also hinted that additional Ether purchases are on the way.
The company now ranks as Japan’s top publicly listed Ether DAT and the 11th largest globally, according to CoinGecko data.
In addition to Ether, Quantum Solutions maintains a smaller Bitcoin treasury, holding 11.6 BTC valued at $1.3 million.
Last week, Zhou revealed that the firm was buying ETH at a pace of 150 million yen ($983,000) per day, with plans to further accelerate its accumulation.
As of now, Quantum Solutions holds 3,866 ETH, worth approximately $14.8 million, according to its website.

ARK Invest Backs ETH Treasuries
Tokyo Stock Exchange-listed Quantum Solutions raised $180 million in late September to build a 100,000 ETH treasury, with backing from venture firms including ARK Invest and Susquehanna International Group (SIG).
While Japan continues to allow publicly listed digital asset treasuries (DATs), other regional exchanges—including those in Hong Kong, India, and Australia—have begun tightening regulations.
“Three months into the DAT revolution, we’re proud to support Japan’s first institutional-grade ETH DAT,” said ARK Invest founder and CEO Cathie Wood on Thursday.
ARK Invest also invested this year in BitMine, chaired by Tom Lee, which is the world’s largest Ether DAT. The firm added BitMine stock to its three innovation and fintech funds in September.
DAT Momentum Shows Signs of Cooling
The hype around digital asset treasuries appears to be slowing, with share prices of some of the world’s largest crypto holders declining in recent weeks.
Last week, Tom Lee questioned whether the DAT bubble had burst, while analysts at 10x Research stated, “The age of financial magic is ending for Bitcoin treasury companies.”
Despite this, Lee has been actively buying the dip following the recent record crypto market crash.

