Bitcoin Trading Follows New York’s Clock After Spot ETFs

Bitcoin never closes, but its trading activity increasingly follows a familiar financial timetable. A market available around the clock is developing distinct busy periods tied to New York, including the afternoon window used to calculate valuations for major U.S. spot Bitcoin exchange-traded funds.

A new study by Peter Schmidt and Lennard Kraft, “Trading to the Fixing: Bitcoin’s Intraday Volume and the New York Benchmark Window After the Spot ETFs,” examines this shift using five-minute trading data from 2020 through June 2026.¹ Its central finding is that Bitcoin’s activity increasingly tracks the New York clock, with stronger alignment following the January 2024 launch of U.S. spot ETFs.

The implications extend beyond identifying busy hours. Financial products can change how an underlying market behaves, even when its technology remains unchanged. Bitcoin’s (BTC ) network still operates continuously, while the institutions trading it bring valuation deadlines, business hours, and reporting obligations.

Why Bitcoin ETFs Need a Daily Valuation Window

An ETF needs a consistent method for calculating the value of its holdings. For Bitcoin, that requires selecting a reference price from a market where prices change continuously across multiple exchanges.

Major U.S. spot Bitcoin funds use benchmarks calculated over the hour preceding 4 p.m. New York time. The study notes that BlackRock’s IBIT uses the CME CF Bitcoin Reference Rate – New York, while Fidelity’s U.S. FBTC uses a separate Fidelity benchmark. Different benchmark providers nevertheless share the same afternoon valuation window.

This creates a common reference point. Institutions measuring performance against a benchmark have reasons to consider when that benchmark is established. Trading, hedging, and inventory management can therefore become organized around a deadline that Bitcoin itself never required.

That distinction matters: the blockchain has no closing bell, but investment products built around it can introduce economic incentives that resemble one.

What the Bitcoin Trading Study Found

The researchers analyzed 657,216 five-minute observations from Bitstamp, covering April 1, 2020, through June 30, 2026. They divided the sample around January 11, 2024, the first trading day for U.S. spot Bitcoin ETFs, and examined how activity varied throughout the day.

Two concentrations stood out after the launch: a morning peak around 10 a.m. New York time and an afternoon peak within the 3–4 p.m. benchmark window. The researchers also replicated the afternoon clock-alignment result using Coinbase data.

The authors distinguish between greater concentration and greater overall activity. Average five-minute volume on Bitstamp fell approximately 49% between the two sample periods. Their hourly comparisons therefore examine shares of daily trading volume, rather than treating a busier relative window as evidence that total trading expanded.

This is a redistribution finding. More activity can cluster around particular hours even when the exchange’s overall volume declines.

Daylight Saving Time Reveals the New York Connection

A peak at a particular universal time does not establish why it occurs. It could reflect traders in different regions, recurring announcements, or exchange-specific routines.

The researchers used daylight saving time to distinguish competing explanations. New York shifts its clocks twice annually. A trading pattern genuinely tied to New York should therefore move by one hour when measured in Coordinated Universal Time, or UTC.

That is what the data show. The afternoon peak appears at 20:00 UTC during standard time and 19:00 UTC during daylight saving time. Both correspond to the hour beginning at 3 p.m. in New York. The morning peak moves similarly.

The measured seasonal interaction for the winter afternoon hour strengthened from approximately −0.13 before the ETF launch to −0.40 afterward. This roughly threefold change concerns the statistical measure of clock alignment. It does not mean afternoon trading volume tripled.

Tests using alternative break dates also suggest gradual strengthening, rather than an instantaneous transformation when ETFs began trading.

Institutionalization Can Change Timing Without Predicting Prices

The study identifies which clock activity follows more convincingly than it identifies the institutions responsible. ETF valuation, U.S. equity trading, macroeconomic announcements, and other institutional routines can share the same time zone.

Consequently, the findings are consistent with ETF-related institutionalization, but do not establish that ETF transactions alone caused the pattern.

They also reveal a useful distinction between market structure and investment performance. Knowing when trading concentrates does not tell an investor whether Bitcoin will rise or fall. The authors find recurring patterns in volume and volatility, while individual hourly return effects do not survive their multiple-testing correction.

That complements Securities.io’s coverage of why Bitcoin ETFs have not made BTC a safe haven. Easier institutional access, more organized trading, and defensive portfolio characteristics are separate questions. Evidence supporting one should not be stretched into proof of the others.

What Concentrated Trading Could Mean for Investors

The practical implication is to evaluate execution conditions rather than search for a daily directional signal. A busy window may offer more counterparties, but it may also attract competing orders and faster price changes.

These are possibilities to investigate, rather than transaction-cost improvements demonstrated by this paper. Volume alone does not establish order-book depth, bid-ask spreads, or the price impact of a particular trade.

• Compare spreads and available depth before placing larger orders.
• Track New York time rather than assuming a fixed UTC schedule.
• Separate predictable activity from predictions about price direction.

A further implication is benchmark crowding. If many participants measure execution against the same reference window, they may have incentives to trade near one another. That could concentrate liquidity and competition simultaneously.

Future research could test this directly using order-level data, ETF creation and redemption records, and measured execution costs. The current findings establish a useful starting point without resolving those questions.

ETF Infrastructure Keeps Evolving

The market structure observed during the study was itself changing. In July 2025, the SEC permitted in-kind creations and redemptions for crypto ETPs, allowing authorized participants to exchange underlying crypto assets for fund shares, rather than relying exclusively on cash transactions.

That flexibility matters when interpreting trading activity. A fund receiving Bitcoin through an in-kind transaction does not necessarily need to purchase the same amount on a public exchange during the valuation hour. Inventory, hedging, and sourcing decisions can distribute activity across venues and times.

Securities.io’s examination of how spot ETFs expanded access to Bitcoin short selling illustrates the broader point: ETF adoption introduces multiple strategies, including hedging and relative-value trading. Institutional participation is more complex than a stream of straightforward purchases.

BlackRock Provides Exposure to Bitcoin’s Financial Infrastructure

For investors interested in the businesses building this infrastructure, BlackRock is a relevant company to examine. Its U.S. iShares Bitcoin Trust ETF connects brokerage-based Bitcoin exposure with the New York benchmark studied by the researchers.

The company’s innovation involves packaging access, custody arrangements, and operating processes around a digitally native asset. BlackRock’s January 2026 discussion of Bitcoin exposure through ETFs explains how familiar investment vehicles can reduce operational barriers. Its April 2026 conversation on digital assets moving from access to infrastructure places that product development within a broader institutional strategy.

BlackRock (BLK ) shares provide exposure to an asset-management business, whose economics depend on managed assets, fees, expenses, and wider market conditions. They do not replicate Bitcoin ownership, and this study does not establish a valuation case for the stock.

Latest BlackRock (BLK) News and Developments

Bitcoin’s Global Market Is Acquiring Local Deadlines

The broader insight is that decentralization and institutional coordination can coexist. Bitcoin does not need a central exchange or a change to its protocol for trading activity to organize around a shared financial deadline.

As access expands through conventional investment products, understanding those deadlines becomes part of understanding the asset. The network remains continuously available, while the market increasingly reflects the schedules of the people and institutions using it.

References:

¹ Schmidt, P., & Kraft, L. (2026). Trading to the fixing: Bitcoin’s intraday volume and the New York benchmark window after the spot ETFs. Finance Research Letters. Advance online publication. https://doi.org/10.1016/j.frl.2026.110932