The CEO of JP Morgan Chase, the largest bank in the U.S. financial market, Jamie Dimon, recently made an unusual move in his annual shareholder letter by directly naming a specific competitor. Amidst the extensive document, he highlighted intensifying competition and shone a spotlight on Citadel Securities. This event is interpreted as symbolic, suggesting more than mere criticism; it indicates that Citadel, which has long specialized in high-frequency trading, is now deeply penetrating the core traditional investment banking sectors of Wall Street. According to reports from major media outlets such as Bloomberg and JP Morgan, Citadel has recently begun to fully expand its business in large block stock trading targeting hedge funds, asset management firms, and pension savings accounts. This expansion represents a move into a high-difficulty area that is the exact opposite of the existing method of processing small orders with algorithms, shaking the existing financial structure itself rather than simply participating in the market.

Citadel has established itself as a giant market maker, currently processing approximately 35% of U.S. retail investors' stock trades and 24% of all orders. Based on a model driven by ultra-fast algorithms, the existing structure has built a stable revenue structure with low revenue per transaction but through massive volumes, and this overwhelming liquidity dominance has become the foundation of its competitiveness today. However, the company is not stopping there; it is moving forward further. Large orders are few in number but large in scale, and they require direct trader intervention to minimize market impact, representing a high-difficulty field. According to Bloomberg Intelligence analysis, this sector accounts for 55% of total stock broker fees and is an area where traditional banks have maintained strong dominance for a long time in terms of profitability and customer relations. Citadel's full-scale entry into this market is read as aiming directly at Wall Street's backyard.

Financial strength also supports this strategy. Citadel recorded record-breaking revenue of $12.2 billion in trading last year, an increase of about 25% compared to the previous year. Solid capital serves as a foundation for directly accepting large institutional orders and absorbing risks, which is a necessary condition for expanding large-order trading businesses. Such strategic changes are clearly evident in talent acquisition as well. Citadel is actively bringing in executives from Wall Street banks to improve organizational quality. Jim Espósito, a former Goldman Sachs executive, joined to build a customer coverage organization, and Ellen Luger, JP Morgan's former high-touch equity trading head, also moved to the company. This is clearly interpreted as an attempt to combine technology-centric organizational strengths with traditional banking-style relationship sales capabilities.

Such movements are leading to tension with existing banks. It is reported that JP Morgan no longer passes on some of its own large stock orders to Citadel, while at the same time, Citadel remains a prime brokerage client of JP Morgan. In a sense, a frenemy relationship where cooperation and competition intersect is being fully realized. Market experts cite advanced trading technology, personal investor flow data, and aggressive capital deployment capabilities as Citadel's differentiating factors. The company has introduced large-order processing technology, strengthened options trading tools, invited former central bank governors and high-level government officials to provide macroeconomic briefings, and expanded research functions. This is read as a strategy to position itself not just as a liquidity provider but as a trading solutions provider.

However, it is not easy to see the banks' fortresses crumbling easily. Banks possess structural strengths in providing comprehensive financial services such as IPO underwriting, bond issuance, and prime brokerage. Larry Tab, an analyst at Bloomberg Intelligence, analyzed that if profits are made in market making, increasing trading volume will grow the business, and expansion into the institutional investor market is a natural strategy. However, this also signifies intensifying competition over the market pie. As things stand, it is difficult to definitively say it is a winner-takes-all scenario. Even amidst geopolitical uncertainty, large bank trading desks recorded record profits in the first quarter of this year. In a phase where the market itself is expanding, the possibility of coexistence between non-bank market makers and traditional banks to a certain extent is also raised.

Nevertheless, this movement is clearly read as a signal of changes in the Wall Street power landscape. This is because a phased evolution strategy is fully underway, starting from mastering retail investor trading, expanding to institutional large orders, and further advancing to data and technology-based services. The key to the future lies in securing trust from institutional customers, managing relationships with banks, regulatory environment changes, and risk absorption capabilities in crisis situations. Whether Citadel Securities can evolve beyond a simple ultra-fast trading firm to become a core liquidity provider on Wall Street, and what defensive strategies banks such as JP Morgan will deploy, have emerged as new focal points for observing the global financial market.