What Was the Pacific Exchange (PCX)?

What Was the Pacific Exchange (PCX)?

6 Min.

The Pacific Exchange (PCX) was a stock exchange based in California that operated from 1882 to 2005 (2002 in physical form). The PCX became the third-largest US options market by the mid-1980s due to significant equity trading activity in Los Angeles and San Francisco. It was one of only four American exchanges that traded equity options and was also the first to create and use an electronic trading system. Nowadays, the PCX primarily exists as an electronic options trading program that operates through NYSE Arca.


In 1882, the Pacific Exchange, commonly called PCX, emerged on the Californian financial landscape. The exchange remained a pivotal player in the region's stock market until 2005, transitioning into a digital format in 2002. Today, its historical legacy endures, albeit in an entirely different form. The Pacific Exchange has evolved into a prominent electronic trading program, closely integrated with the New York Stock Exchange's Arca platform, known as NYSE Arca. This transformation reflects the ever-changing nature of the financial industry as traditional institutions adapt to the demands of the digital age.

The Evolution of PCX: From Trading Hub to Digital Transition

In its illustrious history, the Pacific Exchange, known as PCX, held a prominent position in the world of equity trading. By the mid-1980s, it had earned the distinction of being the nation's third-largest options market. PCX was among the select few US exchanges facilitating equity options trading, pioneering the development and implementation of electronic trading systems. Operating in both Los Angeles and San Francisco, it maintained two trading floors in the latter city.

Yet, in the early 2000s, a transformative moment arrived as PCX divested its stock trading operations to Archipelago Exchange (ArcaEx), a prominent electronic trading firm based in Chicago. This marked the closure of the Los Angeles and Pine Street, San Francisco trading floors. PCX shifted to digital terrain, introducing the PCX-Plus electronic options platform in 2003. This platform allowed options market-makers to conduct trades either from its floor or remotely. In 2005, PCX Holdings, its parent firm, reached an agreement to transfer this operation to Archipelago as well, effectively ending PCX's existence as a standalone entity.

Furthermore, Archipelago obtained Pacific's self-regulatory license, granting Pacific the role of a compliance overseer for ArcaEx. In 2006, Archipelago merged with the New York Stock Exchange (NYSE), leading to the NYSE Arca platform handling all PCX transactions.

Although equity trading on the Pacific Exchange is now exclusively routed through NYSE ARCA, it maintains its options business at the historic Montgomery Street headquarters in San Francisco, housed in the Mills Building. Local firms, including Casey Securities and Student Options, alongside major sell-side investors such as Goldman Sachs, continue to operate on the options floor, sustaining a dynamic legacy in the world of finance.

The Pacific Exchange: A History of Evolution

The Beginning Stages

The Pacific Exchange, or PCX, traces its roots to two financial markets born in late 19th-century California. The San Francisco Stock and Bond Exchange, founded in 1882, emerged to facilitate transactions tied to the silver riches of the Comstock Lode in Nevada. James Graham Fair, John William Mackay, William S. O'Brien, and James Claire Flood, who made huge profits from the Comstock Lode, played important roles in this transaction.

Meanwhile, to the south, the Los Angeles Oil Exchange, led by figures like Wallace Libby Hardison, one of Union Oil's founders, began operations in 1889. In 1957, these two exchanges amalgamated, forming the Pacific Stock Exchange, later shortened to the Pacific Exchange in 1997.

The PCX's Heyday

For years, the PCX was a financial cornerstone in San Francisco. It weathered significant economic events, including the California Gold Rush and the Great Depression. At its pinnacle, the Pacific Exchange managed the trading of over 2,700 stocks, bonds, and various securities on floors in San Francisco and Los Angeles. The year 1997 marked a zenith, with a staggering 3.3 billion shares exchanged. Moreover, it handled options for over 800 stocks, overseeing 46.7 million options contracts.

Transition to Technology

As the business landscape embraced computers in 1969, the PCX swiftly automated certain trading processes. Nevertheless, the open outcry system for stock trading became obsolete with the advent of electronic trading. In 1999, PCX Holdings, the exchange's proprietor, opted for demutualization, establishing PCX as the inaugural US stock exchange to do so.

Transformation and Integration

The PCX embarked on a transformative journey with the dawn of the 21st century. It divested its equity trading division to Archipelago in 2000, leading to the closure of the Los Angeles trading floor in 2001, followed by the San Francisco Pine Street floor. The former San Francisco Pacific Exchange building at 301 Pine Street became a fitness center after being sold to private developers.

In 2005, Archipelago Holdings Inc. completed its absorption of PCX, acquiring critical assets (an electronic stock options trading system and a self-regulatory license) from PCX Holdings for $50.7 million. Shareholders received 20% of the purchase price in Archipelago stock, securing a significant stake in the entity. Today, equity trading on the Pacific Exchange exclusively unfolds through the electronic communications network NYSE ARCA.

Transformation of Stock Exchanges in the Digital Age

Advancements in trading technology reshaped the destiny of multiple exchanges. In 1980, the Cincinnati Stock Exchange, established in 1885, transitioned from its traditional floor-based operations to predominantly electronic trading, subsequently rebranding as the National Stock Exchange (NSE). Similarly, the Boston Stock Exchange, founded in 1830 and now known as Nasdaq, pioneered electronic trading. As a founding member of the all-electronic Boston Options Exchange, it embraced the digital era.

The Chicago Stock Exchange (CHX), with its origins dating back to 1882, embarked on an expansion journey. Over the years, it absorbed various competitors across Cleveland, St. Louis, Minneapolis, and even New Orleans, adapting to the evolving landscape of the stock market.


The Pacific Exchange underwent a remarkable evolution from its founding in 1882 to its digital transformation in 2002. It pioneered electronic trading systems, mirroring the broader shift in stock exchanges, like the Cincinnati Stock Exchange's move to electronic trading and the Boston Stock Exchange's transformation into Nasdaq. The Chicago Stock Exchange also adapted by absorbing competitors. These exchanges' histories underscore the profound impact of technology on financial markets, reshaping the way securities are traded. Their legacies remind us of the need for continuous innovation and adaptation in the financial industry.

Pacific Exchange (PCX)
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