BlackRock IBIT week inflows rank 9th in the U.S., Bitcoin options OI tops Deribit

According to data published on X by Bloomberg ETF analyst James Seyffart, BlackRock’s IBIT spot Bitcoin ETF recorded net inflows of $994 million over the week as of April 24, ranking ninth among all U.S. ETFs by weekly net inflows. In the same period, Volmex’s tracking data shows that IBIT options open interest (OI) surpassed Deribit for the first time.

IBIT weekly inflow data and its ranking among U.S. ETFs

(Source: Bloomberg Information)

Based on statistics posted by James Seyffart on the X platform, as of the week of April 24, total inflows into ETFs across the U.S. reached $35.39 billion. In the weekly inflow rankings, Vanguard’s VOO and SPDR’s SPY still lead the pack. ARK Innovation ETF (ARKK) ranks fourth with more than $1.23 billion, the Technology Select Sector SPDR Fund (XLK) ranks fifth with $1.12 billion, and IBIT ranks ninth with $994 million.

James Seyffart described the market environment for that week as a strong “Risk-on” rebound.

On April 23, IBIT recorded net inflows of $167 million in a single day, accounting for the bulk of the $223 million in total inflows across U.S. spot Bitcoin ETFs that day.

According to James Seyffart’s data, IBIT’s key cumulative metrics are as follows (as of April 24):

Total cumulative net inflows: $65.3 billion

Cumulative inflows over the past three months: $2.43 billion

Inflow for the week as of April 24: $994 million

IBIT options OI first surpasses Deribit

According to Volmex’s tracking data, as of April 24 (Friday), IBIT’s options OI on Nasdaq reached $27.61 billion, exceeding Deribit’s $26.9 billion. This marks the first time the IBIT options market size has surpassed Deribit. Deribit has been deeply engaged in the Bitcoin options market since 2016. IBIT-related options products have been available for about two years so far.

Sidrah Fariq, Global Head of Retail Sales and Operations at Deribit, said that IBIT’s development is a positive step for the crypto derivatives ecosystem.

IBIT options market structure data

According to Volmex’s analysis data, IBIT call options open interest is mainly concentrated at a strike price of about $109,709—approximately 41% higher than the current spot Bitcoin price of about $77,400. Deribit’s corresponding open interest is mainly concentrated around $106,000.

Regarding expiration dates, Volmex’s data shows that the average expiration date for IBIT open interest is concentrated in October 2026, while Deribit is mainly dominated by contracts expiring in August 2026. Volmex’s analysis also indicates that IBIT’s implied volatility (IV) is currently higher than Deribit’s, and explains that this is related to structural factors, including that ETF holders lack direct Bitcoin short tools and therefore tend to hedge using put options.

Frequently asked questions

What is the data source for IBIT’s $994 million weekly inflow?

The data source is market statistics published on X by Bloomberg ETF analyst James Seyffart. The coverage includes the single-week data through April 24, showing that IBIT ranks ninth in weekly inflows among all U.S. ETFs.

When did IBIT options OI first surpass Deribit? What is the basis?

According to decentralized volatility agreement Volmex’s tracking data, as of April 24 (Friday), IBIT’s options OI on Nasdaq reached $27.61 billion, first surpassing Deribit’s $26.9 billion.

What differences exist in the expiration-date structure between IBIT and Deribit options?

According to Volmex data, the average expiration date for IBIT open interest is concentrated in October 2026, while Deribit is mainly dominated by contracts expiring in August 2026. There are clear differences in the two parties’ position-holding cycle structures.