The Cincinnati Blueprint: How a Regional Exchange Reinvented Capital Markets

Introduction

Most people in Cincinnati walk past it every day without knowing. At 49 East Fourth Street, on the façade of the Dixie Terminal Building, a historical marker tells a story that changed the world. It reads, in part, that the Cincinnati Stock Exchange pioneered the nation's first computerized stock exchange — a system that revolutionized trading domestically and then globally.

The marker was erected in 2020 by the K.R.B. Niehoff Fund, the Cincinnati Preservation Association, and the Ohio History Connection. But the story it tells stretches back 141 years, to a group of businessmen who gathered in 1885 to build something their growing city desperately needed: organized capital markets.

What followed is one of the great untold stories of American financial innovation. A regional exchange, operating from the second floor of a streetcar terminal in downtown Cincinnati, developed the technology that would become the backbone of every major stock exchange on Earth. It did so not by incremental improvement, but by reinventing how securities were traded — replacing the trading floor itself with an electronic network that was faster, fairer, and more transparent than anything the industry had ever seen.

The New York Stock Exchange resisted the innovation for decades. London adopted it first. And when the dust settled, the principles Cincinnati pioneered — automated execution, best-price guarantees, electronic order matching — became the foundation on which trillions of dollars in daily trading volume now rests.

This is that story.

I. The Queen City and the Birth of an Exchange

To understand why Cincinnati built a stock exchange in 1885, you have to understand what Cincinnati was in 1885.

By the middle of the nineteenth century, Cincinnati had earned the title "Queen of the West." It was one of the largest cities in the United States, the nation's primary inland port, and the commercial gateway to the western frontier. Steamboats moved goods along the Ohio River. The city sat at the crossroads of Northern and Southern commerce. By 1850, Cincinnati was the principal hog market in the world — a distinction that earned it the less glamorous nickname "Porkopolis."

But Cincinnati was more than a meatpacking hub. Its industries — iron production, woodworking, cloth manufacturing, soap and candle making — generated enormous economic activity. By 1887, the city's factories produced over $200 million in goods and employed more than 103,000 people. Procter & Gamble, founded in Cincinnati in 1837, was already a national brand. The city's sixteen banks, concentrated along Third Street near the Public Landing, formed a financial corridor that predated Wall Street's dominance.

Railroad companies were expanding rapidly, connecting Cincinnati to major cities across the country. The Cincinnati Southern Railway, a publicly owned railroad built in the late 1860s and 1870s, was one of the most ambitious infrastructure projects of its era. Financial firms, insurance companies, and industrial enterprises all needed a structured mechanism for trading their securities. The informal system of private deals and personal networks could not keep pace with the region's growth.

In March of 1885, a group of prominent Cincinnati businessmen gathered to address this gap. Their solution was to establish the Cincinnati Stock Exchange — a formal marketplace where securities in the companies driving the city's growth could be traded under standardized rules, with transparent pricing and open access.

The founding principle was straightforward: capital allocation works better when it operates through transparent infrastructure rather than opaque networks. It was a principle the institution would return to, in a far more dramatic fashion, ninety years later.

II. The Dixie Terminal Years

For its first few decades, the Cincinnati Stock Exchange operated quietly and competently, serving the region's financial community. It listed local railroad companies, banks, and industrial firms. Traders worked a physical floor, handwriting tickets and executing orders manually. The exchange was functional, respected, and — by the standards of the era — entirely unremarkable.

The exchange found its permanent home when the Dixie Terminal Building opened on October 22, 1921. Designed by the Cincinnati architectural firm Garber & Woodward — the same firm that designed several buildings on the University of Cincinnati campus — the Dixie Terminal was a $3.5 million complex at the corner of Fourth and Walnut Streets. It was, at the time, the largest building in downtown Cincinnati by square footage.

The building was actually two structures. The four-story south building served as a streetcar terminal for lines arriving across the Ohio River from Northern Kentucky via the Roebling Suspension Bridge. The ten-story north building housed railroad ticket agencies, the administrative offices of the Cincinnati Street Railway Company, commercial offices, and the Cincinnati Stock Exchange. It opened with 99 tenants, including future Senator Robert A. Taft and the offices of the Cincinnati Baseball Club.

The Dixie Terminal was more than an office building — it was a civic crossroads. At its peak, roughly 100,000 people passed through the terminal each day. Men in the bus station at rush hour shouted bus numbers and destinations while commuters raced through the arcade to catch their rides home. A grocery store in the lower level sold produce and deli items. A newsstand offered the afternoon papers. The building's Adamesque barrel-vaulted concourse, framed by hand-glazed Rookwood tiles manufactured by the local Rookwood Pottery Company, was one of the most stunning interior spaces in the city — a polished, vibrant glimpse into the golden era of Cincinnati architecture, with a medallion-covered ceiling displaying whimsical art of children riding animals. Joseph Francis Beller is believed responsible for the original gold-leafing and cherub artwork that adorned the interior.

For more than seven decades, the CSE operated from Room 205 on the second floor of this extraordinary building. Traders knew each other by name. Everyone had a nickname. Orders were called out across the floor. The exchange tracked companies like Procter & Gamble, Delta Air Lines, and American Electric Power. It was a regional institution doing regional work — and there was nothing about it in the 1960s that would have suggested it was about to change the world.

"Hidden behind the façade of laundry detergent and bean-less chili is the untold story of a regional stock exchange that gave birth to the national stock market system that allows 25 million transactions and 5 billion corporate shares to be traded daily."

— cincinnatistockexchange.us, UC Journalism Program and Cincinnati Historical Society

III. The 1975 Amendments and a Mandate for Change

The catalyst for everything that followed was a piece of federal legislation. On June 4, 1975, President Gerald Ford signed the Securities Acts Amendments of 1975 into law. It was the most significant reform to the American securities industry since the original Securities Exchange Act of 1934.

The amendments addressed a fundamental problem. By the early 1970s, the nation's securities markets had grown enormously, but their infrastructure had not kept pace. Institutional investors — pension funds, mutual funds, insurance companies — had come to dominate trading, growing from 34 percent of the New York Stock Exchange's volume in 1961 to 70 percent by 1974. The manual systems that had served the markets for generations were straining under the weight of modern volume.

More troubling, the markets were fragmented and opaque. The same stock sometimes traded at different prices on different exchanges. Fixed commission rates, mandated by the NYSE since the Buttonwood Agreement of 1792, protected broker profits but harmed investors. The SEC had been investigating market structure since 1971, and Congress was losing patience.

The 1975 Amendments directed the SEC to establish a National Market System — a framework for linking the nation's exchanges through modern telecommunications and computerization. Fixed commission rates were abolished. Seven exchanges across the country were tasked with modernizing. The legislation envisioned, in the words of the House-Senate conferees, a national market system that would evolve through the interplay of competitive forces, as unnecessary regulatory restrictions were removed.

At the signing, President Ford emphasized the importance of electronic and communications technology as the basis for a fully integrated trading system. He expressed confidence that freely competitive pricing would produce a much healthier industry.

Most of the seven exchanges moved cautiously. The Cincinnati Stock Exchange moved first.

IV. Nick Niehoff and the Automation of an Exchange

The man who transformed the Cincinnati Stock Exchange was K. Richard B. "Nick" Niehoff. When he took the helm of the CSE in the late 1970s, he was in his late twenties — young, unconventional, and relentlessly focused on what technology could make possible. He would serve as president until 1990, and under his leadership, the exchange went from a quiet regional marketplace to the most technologically advanced securities exchange on the planet.

Niehoff's first challenge was finding a technology partner. The CSE had no internal capability to build software, operate data centers, or manage telecommunications networks. The exchange knew about regulations, rules, members, listing and delisting stocks — it could turn on the lights at the beginning of the day and turn them off at the end. But computing was foreign territory.

He evaluated several companies, including IBM, before selecting Control Data Corporation (CDC), a Minneapolis-based supercomputer firm founded in 1957 by a group of former Sperry Rand engineers led by William C. Norris. CDC was known for building some of the world's fastest computers — its CDC 6600, designed by the legendary Seymour Cray, was the first true supercomputer when delivered in 1964. More importantly for Niehoff, CDC specialized in data management and telecommunications networking through its CYBERNET services division.

Peter DuPont, who served as president of CDC's Electronic Trading Services division, became Niehoff's key partner in the automation project. DuPont later confirmed Niehoff's assessment of the challenge they faced: they knew they had formidable opponents, primarily the NYSE, who didn't recognize that they were being overtaken by technology.

Building the NSTS

With CDC as its technology partner, the CSE began building the National Securities Trading System — the NSTS. Twenty programmers were employed to write assembler code, translating machine instructions into the specific logic needed to accept, match, and execute stock orders electronically. No other exchange in the United States had ever attempted anything comparable.

The capital expense was staggering for a small regional exchange — $3 million in the first year alone, a sum that no other exchange, including the NYSE, had committed to automation at the time. Niehoff later admitted that Saturday mornings would find him at the office doing financial work with the CSE's chief financial officer, asking whether they were even making enough money to pay their bills. Then a new member firm would come on board, and the momentum would resume.

The personal cost was more than financial. Niehoff was regularly traveling from Cincinnati to New York, from meetings at the CDC data center in Jersey City to visits to member firms. He was in his late twenties and early thirties during the most demanding years of the project, and he later acknowledged that the toll went beyond money. Did he ever envision walking away? He said he wouldn't be truthful if he didn't admit that he had considered it.

An Exchange Without Walls

The NSTS launched as a pilot program approved by the SEC in 1976. The CSE's physical trading floor closed, and the exchange became entirely electronic — brokers executing customer orders directly through data terminals. The transformation was immediate. Orders that had previously required one to two minutes of manual processing were now executing in seconds.

The daily operations of the new system were unlike anything the industry had seen. Five workers alternated responsibility for turning on the markets remotely from Cincinnati each morning. They would send test messages through the system to confirm connectivity — informal check-ins to member firms across the country. Niehoff himself operated with a 40-button phone set that connected him to 40 people simultaneously, a lifeline to the network of firms, regulators, and technology partners keeping the system alive.

"We had created an exchange without walls. Like air, it was everywhere."

— Nick Niehoff, President, Cincinnati Stock Exchange

But Niehoff's vision extended far beyond Cincinnati. He proposed connecting the CSE's system to other regional exchanges — Chicago, Pacific, Philadelphia, and Boston — through a telecommunications network. If a rare order for a Boston-listed company's stock, such as Gillette, appeared at the CSE, the system could route it to the Boston Stock Exchange specialist, where a deeper market existed. Conversely, an order for Procter & Gamble arriving in Boston could be routed to Cincinnati, where the hometown stock had the most liquid market. The concept was revolutionary: interconnected, automated market infrastructure seeking the best price for every trade, regardless of geography.

CDC's programmers continued to refine the system, forming a subsidiary called Brokerage Transaction Services, Inc. (BTSI) to further streamline the trading process. The CSE integrated BTSI's processes into the NSTS, and under Niehoff's leadership the exchange was always in search of cheaper, faster, better software and cheaper, faster, better hardware. As technology evolved, the system evolved with it.

V. 1985: The World's First Fully Automated Exchange

After a decade of development, testing, and real-world use by member firms, the Securities and Exchange Commission took a historic step. In 1985, the SEC granted permanent approval to the NSTS, designating the Cincinnati Stock Exchange as the first stock exchange in the world to operate on a fully automated, screen-based trading system without a physical trading floor.

The significance of this moment is difficult to overstate. The CSE had proven that an exchange could function entirely through electronic infrastructure — no trading floor, no floor brokers, no specialist system, no handwritten tickets. Orders were accepted, matched, and executed by computers, automatically, with built-in best-execution guarantees. The system increased communications processing capability between exchanges by 25 to 35 percent and added more than 400 securities to its coverage. Between January 1982 and December 1984, the NSTS nearly doubled its number of traded stocks from 105 to 202, and share volume grew from 3.2 million to 5.4 million.

The SEC's 1985 approval order was, by many accounts, one of the most consequential regulatory decisions in modern exchange history. Niehoff himself called it the most significant event in modern U.S. exchange history. The SIA Chairman, Benjamin Edwards, had recognized the potential years earlier, stating in a November 1980 speech before the Securities Industry Association that the Cincinnati Stock Exchange had an automated system which was working, that it might be a prototype of what the industry needed, and that it could be a solution for handling future trading volumes of 125 or even 150 million shares per day.

He was right — though he underestimated the scale. Today, the global securities industry routinely processes four to six billion shares per day across approximately 18 to 20 million trades daily — more than 1,000 trades per second. None of that would be possible without the electronic infrastructure that was first proven to work in Room 205 of the Dixie Terminal Building.

"As the first fully automated stock market in the world, the Cincinnati Stock Exchange made stocks and securities more accessible to the public and revolutionized the financial industry."

— Elissa Sonnenberg, MSEd, Assistant Professor, University of Cincinnati

VI. David and Goliath: The Rivalry with New York

The relationship between the Cincinnati Stock Exchange and the New York Stock Exchange was, for much of this period, adversarial. The NYSE had every reason to resist automation. Its members — the specialists and brokers who controlled the trading floor — were making enormous profits under the existing system. As Niehoff later explained, the members owned the exchange, so there was no incentive to disrupt a profitable arrangement.

The NYSE promoted what it called the "floor model" — a people-dependent system that relied heavily on specialists and brokers conducting business face to face. The exchange argued that human judgment was essential to maintaining orderly markets, particularly during periods of high volatility. Behind that argument was a simpler economic reality: the floor system enriched its participants.

The resistance went beyond rhetoric. The Martin Report, authored by former NYSE president William Chesney Martin Jr., proposed arguments for protecting fixed commission rates and granting the NYSE and AMEX exclusive rights to trade any stock deemed nationally important — along with antitrust exemptions. This was a proposal to entrench the existing power structure through legal protection, and it was especially audacious given that the SEC's own investigation had identified the need for a National Market System precisely because antitrust and monopoly regulation had proven ineffective.

The CSE's success only intensified the opposition. As the NSTS gained traction and Niehoff invited other regional exchanges to join as participants, the NYSE resisted automation efforts at every turn. Congress eventually intervened. By 1979, congressional investigators were asking why the SEC had not moved faster to enforce the national market system mandate.

One of the SEC's most compelling arguments for automation was transparency. The electronic audit trails created by systems like the NSTS made insider trading far more difficult. As Niehoff observed, the further you move from people communicating orally in a floor crowd — where clues about what may or may not be happening can pass between individuals — the more the opportunity to trade on inside information begins to disappear.

The irony of the story is that the smallest exchange in the system was the one that moved first and fastest. Cincinnati's very smallness was its advantage. Without entrenched interests to protect, without a floor full of specialists whose livelihoods depended on the manual system, the CSE could innovate from scratch rather than retrofit a legacy operation. It is a pattern that recurs throughout the history of innovation: smaller, more agile institutions moving faster than the entrenched incumbents.

VII. Global Impact: London Adopts Before New York

The Cincinnati model did not stay in Cincinnati. Its impact went global — and in a detail that captures the irony of financial innovation, London adopted the approach before New York did.

On October 27, 1986, the London Stock Exchange underwent what became known as the "Big Bang" — a sweeping deregulation enacted under Prime Minister Margaret Thatcher that eliminated fixed commissions, dissolved the distinction between stockbrokers and market makers, opened the exchange to foreign firms, and replaced floor-based trading with electronic, screen-based systems. The reforms proved successful: trading volumes surged, market capitalization increased, and London reinforced its position as one of the world's leading financial centers.

The electronic trading architecture that London adopted during the Big Bang drew on the principles the Cincinnati Stock Exchange had pioneered. Automated order matching, screen-based execution, the elimination of the physical trading floor — these concepts had been operational in Cincinnati for years before London implemented them. The NSTS framework became, in various adaptations, the blueprint for exchange modernization worldwide.

The New York Stock Exchange, by contrast, maintained its floor-based specialist system well into the 21st century, only gradually incorporating electronic execution. The institution that dominated American finance for two centuries was among the last to embrace the model that a small exchange in Ohio had proven workable a generation earlier.

Niehoff reflected years later that the core algorithmic principles of best execution had not changed since the NSTS was built. What changed was the technology — the original assembler code would be useless at modern volumes. But the principles that drove transactions then are the same principles that drive them now. Best execution. First-come, first-served. Transparent, automated, and fair.

VIII. The Later Years

The Cincinnati Stock Exchange itself continued to evolve after its pioneering decade. In 1986, it joined the Chicago Board Options Exchange through a membership arrangement and became the first exchange to adopt the fully automated Intermarket Trading System (ITS), linking its members to all markets. In 1995, the exchange relocated its headquarters from Cincinnati to Chicago, though it maintained operations in the Dixie Terminal until the move was complete. The physical departure from the building where it had operated for more than seven decades marked the end of an era.

In 2003, the exchange rebranded as the National Stock Exchange (NSX), moving its headquarters to Jersey City, New Jersey. The name change reflected a truth that had been apparent for decades: the system born in Cincinnati had long since outgrown its regional identity. After demutualization in 2006 — converting from a member-owned cooperative to a for-profit corporation — the NSX went through a turbulent period. CBOE Stock Exchange acquired it in 2011. Trading paused in 2014 during a reorganization. New ownership resumed operations in late 2015.

In December 2016, the New York Stock Exchange announced it would acquire the National Stock Exchange. Trading operations ceased on February 1, 2017. The SEC approved the acquisition, and the exchange relaunched on May 21, 2018 as NYSE National, operating on the NYSE Pillar trading platform. The exchange that had once challenged New York was now part of it.

IX. The Man Who Kept Building

Nick Niehoff's story did not end when he left the Cincinnati Stock Exchange in 1990. The instincts that drove him to automate a regional exchange in his twenties continued to shape his career — and the impact of Cincinnati's innovation radiated outward through his subsequent work.

Niehoff moved to NASDAQ, where he founded and led the Trading Services group. Under his direction, the group launched the OTC Bulletin Board in 1990 — a quotation system for over-the-counter securities that gave smaller companies a platform for trading when they couldn't meet the listing requirements of major exchanges. He also introduced the ACT trade reporting mechanism and FIPs, a bond trade reporting system. These were systems built on the same premise that animated the NSTS: technology could create transparent infrastructure for markets that had previously relied on phone calls and personal relationships.

After leaving NASDAQ in 1993, Niehoff took his expertise international. He oversaw the construction of Poland's electronic OTC market — bringing the principles he had developed in Cincinnati to a post-communist economy building its capital markets from scratch. He later developed SBX Nanocap, an internet-based order matching system for the trading of nano-cap stocks, companies with market capitalizations under $50 million. In 1999, he established WEBiX, an alternative trading system for OTC stocks.

Throughout this later career, Niehoff remained a vocal advocate for what he called a "Main Street Meets Technology" philosophy. His concern was always the same: when companies don't have a technology platform on which shares are quoted and last sales are visible, the investors who work in factories and offices in local towns — the people who own stock in companies they care about — are left in the dark.

It was the same instinct that had driven the CSE's automation thirty years earlier. Technology exists to make markets accessible to everyone, not just the people who already have access. That conviction — born in Room 205 of the Dixie Terminal — followed Nick Niehoff from Cincinnati to New York to Warsaw and beyond.

X. Legacy

The legacy of the Cincinnati Stock Exchange is not the institution — it is the infrastructure. The NSTS's core design principles remain embedded in every major securities exchange in the world. Automated order matching. Electronic execution. Best-price guarantees enforced by software rather than human judgment. The transparency of digital audit trails. The ability to route orders across markets instantly, seeking the best outcome for the investor regardless of which exchange holds the order.

Thirty years after the NSTS was approved, the industry it transformed routinely processes more than 1,000 trades per second. All of this activity could not have been handled and processed if it were not for the power of computerization and the quiet hand of the Cincinnati Stock Exchange.

In 2020, the K.R.B. Niehoff Fund — supported by Nick Niehoff's brother Buck — joined with the Cincinnati Preservation Association and the Ohio History Connection to erect a historical marker at the Dixie Terminal commemorating the CSE's contribution to global financial markets. The building itself, now owned by American Financial Group, underwent a four-month dome renovation in 2017 to restore the arcade ceiling to its original colors. The Rookwood tiles still frame the entrance. The marble still gleams. A scene in the 1988 film Rain Man was shot there.

The primary historical research on the CSE was compiled through a collaborative project between the University of Cincinnati Journalism Program and the Cincinnati Historical Society — a partnership that ensured the story would be preserved by the academic and cultural institutions of the city where it happened.

Not every city can claim a heritage like this. Most people walk past 49 East Fourth Street without a second glance. But behind the Rookwood tiles and the barrel-vaulted ceiling, in a second-floor room where traders once shouted orders and a young president with a 40-button phone connected a city to the future — something happened that changed the way the world moves capital.

Cincinnati did that. And it's a story worth knowing.

Key Milestones

1885 — Cincinnati Stock Exchange founded by a group of prominent Cincinnati businessmen.

1921 — Dixie Terminal Building opens at Fourth and Walnut Streets; CSE operates from Room 205.

1975 — Securities Acts Amendments signed by President Ford; Congress mandates a National Market System.

1976 — CSE partners with Control Data Corporation; NSTS pilot program approved by SEC; physical trading floor closes.

1980 — CSE becomes the first all-electronic stock exchange in the United States; SIA Chairman calls it a prototype for the industry.

1982–84 — NSTS doubles traded stocks (105 to 202); share volume grows from 3.2M to 5.4M.

1985 — SEC grants permanent approval to NSTS — CSE becomes the world's first fully automated exchange.

1986 — London's "Big Bang" adopts electronic trading principles pioneered by Cincinnati; CSE joins CBOE and adopts Intermarket Trading System.

1990 — Nick Niehoff departs CSE; joins NASDAQ and launches the OTC Bulletin Board.

1995 — CSE relocates headquarters to Chicago; maintains Dixie Terminal operations until complete.

2003 — CSE rebrands as the National Stock Exchange (NSX); headquarters move to Jersey City, NJ.

2006 — NSX demutualizes into a for-profit corporation.

2011 — CBOE Stock Exchange acquires NSX.

2017 — New York Stock Exchange acquires NSX; trading operations cease February 1.

2018 — Exchange relaunches as NYSE National on the Pillar trading platform.

2020 — Historical marker erected at Dixie Terminal by K.R.B. Niehoff Fund, Cincinnati Preservation Association, and Ohio History Connection.

Sources and Acknowledgments

This publication draws on historical research from the following sources:

• Cincinnati Stock Exchange Historical Marker (Ohio Historical Marker 97-31), Historical Marker Database
• "The Birth of the Modern Stock Market: Automation and Impact," cincinnatistockexchange.us, a collaborative project of the University of Cincinnati Journalism Program and the Cincinnati Historical Society
• "The Art of Automation: Nick Niehoff, Curator," cincinnatistockexchange.us
• "A Bulletin Board Tech Guru," Traders Magazine
• NYSE National, MarketsWiki
• National Stock Exchange, Wikipedia
• Dixie Terminal, Wikipedia; Great American Insurance Group; 365 Cincinnati
• Securities Acts Amendments of 1975, Congress.gov and The American Presidency Project
• Remarkable Ohio Historical Markers
• Big Bang (financial markets), Wikipedia, Goldman Sachs, and MarketsWiki
• Control Data Corporation, Computer History Museum and Minnesota Computing History

Special recognition to the K.R.B. Niehoff Fund for its commitment to preserving the legacy of the Cincinnati Stock Exchange, and to the University of Cincinnati Journalism Program and Cincinnati Historical Society for their collaborative research that forms the primary historical record of this story.