Tether has secured an 8.2 percent stake in bitcoin (BTC) mining finance platform Antalpha, becoming a major shareholder.

Cointelegraph, a blockchain media outlet, reported on April 20 local time that the stake purchase made Tether one of Antalpha's largest shareholder groups since its initial public offering in May 2025.

According to a Schedule 13D filing submitted to the U.S. Securities and Exchange Commission, Tether holds 1.95 million Antalpha shares through affiliated entities. Tether chairman Giancarlo Devasini (잔카를로 데바시니) was shown to share voting and disposal authority over the stake. The filing also said Tether may increase or decrease its holdings depending on market conditions and other factors.

Antalpha provides bitcoin-backed loans and financing for mining equipment. Its loan portfolio was about $1.6 billion as of end-2024. It is also characterised by close ties to the Bitmain ecosystem, a major mining hardware supplier.

Its performance also showed growth. Antalpha's 2025 revenue rose 68 percent from a year earlier to $79.7 million. Net profit grew to $18.5 million, more than tripling from the previous year. In early trading on April 20, its shares were up about 7.2 percent at around $9.97.

The investment aligns with a recent trend in which Tether is using profits to expand its investments in digital asset infrastructure and financial services. Tether is broadening its investment targets to include mining, artificial intelligence (AI), financial services and tokenised assets. On the same day, Abu Dhabi-based tokenisation company Kaio said Tether took part in an $8 million investment round.

In its investment announcement, Kaio said Tether's participation reflected a "direct strategic alignment". It added that USDT had "become the dominant settlement layer for cross-border capital flows" and said Kaio was the next layer that provides USDT holders with structured and compliant access to institutional-grade yield opportunities.

Tether's investment push has accelerated this year. In March, it led a $50 million investment round in sleep-related products company Eight Sleep, valuing the company at $1.5 billion. In February, it invested $150 million, equivalent to about a 12 percent stake, in Gold.com as part of a strategy to expand access to tokenised gold through XAUt. That month it also made a $100 million equity investment in Anchorage Digital, a federally chartered U.S. digital asset bank.

Tether Chief Executive Paolo Ardoino (파올로 아르도이노) said in July last year that Tether had invested in more than 120 companies through its venture arm. He said the investments were made from company profits, not stablecoin reserves. Tether was also reported earlier this month to be seeking new fundraising based on a $500 billion valuation, and it has also said it could delay fundraising if investor demand falls short of expectations.

As a result, the Antalpha stake purchase is seen as a move to increase Tether's exposure to mining infrastructure and digital asset financial services, rather than remaining a simple financial investment. With the filing leaving open the possibility of additional purchases, whether Tether will further increase its Antalpha stake is expected to be a point to watch.