Jane Street: who profits from deglobalization and how

Jane Street is not an anomaly of modern markets. It is the logical product of an increasingly fragmented financial world.

The 39.6 billion dollars generated in 2025 explain who the structural winners of this transformation are and why traditional banks are losing ground not due to a lack of talent, but because of how they are built.

• Price difference

Between two markets there is always a price difference.

A stock listed simultaneously in New York and London never has exactly the same price at the same moment. A bond does not have the same value in Tokyo and Frankfurt.

This difference represents the cost of crossing barriers between markets: geographic, legal, informational, or temporal.

Those who cross these barriers faster capture the difference.

This is arbitrage.

Jane Street has industrialized arbitrage.

With algorithms operating in microseconds and proprietary capital of approximately 45 billion dollars, according to Bloomberg and Financial Times, the firm buys and sells simultaneously across hundreds of markets, systematically capturing tiny price differences.

Profit comes from the speed of crossing the space between markets.

• Why 2025 was so profitable

Differences between markets increase when the world becomes more unstable: geopolitical tensions, abrupt changes in monetary policy, fragmentation of trade flows, high volatility.

In 2025, all these forces acted simultaneously.

Price differences widened.

Arbitrage opportunities increased.

Jane Street was ready to exploit them.

At the same time, traditional banks partially withdrew from the market due to capital constraints and risk rules.

Jane Street operates primarily with proprietary capital. It can remain active precisely when competitors reduce exposure.

Volatility does not reduce its profit.

It increases it.

• The paradox of success

The model, however, contains an internal contradiction.

Jane Street makes money from differences between markets. But the more efficient the firm becomes, the more these differences compress.

Success consumes its own space of reproduction.

The firm responds to this structural limit through continuous expansion into new areas where fragmentation is still high.

The expansion from London and investments in CoreWeave and Anthropic indicate the same logic applied to a new domain: artificial intelligence infrastructure and the market for computational capacity.

There, barriers are still high.

Price differences are still profitable.

• The new systemic risk

The Jane Street model redistributes global financial rent from large banks with tens of thousands of employees to compact firms with algorithms and concentrated capital.

However, this transformation also creates a new systemic risk.

If liquidity provision becomes concentrated in a few firms with similar models, there is a possibility that they react simultaneously in periods of extreme stress.

At that moment, liquidity may disappear exactly when it is most needed.

• The new frontier

Jane Street's investments in AI infrastructure indicate the emergence of a new arbitrage space: the market for computational capacity, where barriers to entry remain high and price differences are still significant.

As regulation compresses the profitability of traditional arbitrage, the competitive advantage shifts toward actors who first identify new areas of profitable fragmentation.

This is the structural logic of contemporary financial capitalism: arbitrage consumes existing differences and constantly searches for new ones.