On May 1, 1975, US stock exchanges lost the power to require fixed public brokerage commissions. The change, known on Wall Street as “May Day,” allowed brokers to compete on the price of executing customers’ trades. The Securities and Exchange Commission had adopted Rule 19b-3 on January 23, 1975; May 1 was its effective date, not the day regulators first announced the decision.
This was price deregulation, not the removal of securities regulation. Congress followed with the Securities Acts Amendments of 1975, enacted on June 4, which reinforced the commission reform while expanding market oversight. The SEC’s 1975 annual report places both changes within a broader effort to make securities markets more competitive and efficient.
For investors, the question became more direct: what service was a broker providing, and what was it worth? For brokers, an exchange rule could no longer supply the answer.
What Fixed Brokerage Commissions Meant
The old system had roots in the Buttonwood Agreement of May 17, 1792. Twenty-four brokers signed the agreement that became the foundation of the New York Stock Exchange, establishing trading arrangements and set commissions. The NYSE’s history of its founding records those origins. The later commission schedules were more elaborate, but retained the principle that exchange members should not freely undercut an agreed charge.
“Fixed” did not mean every customer paid the same dollar amount for every order. A schedule could produce different charges for different transactions. The restriction concerned price competition: a broker could not simply quote below the applicable exchange minimum to win the business.
That distinction matters. Consider two firms executing an otherwise comparable order. One customer wants advice and regular contact; another has already chosen the stock and wants execution only. Under a compulsory minimum, the second firm cannot necessarily pass its simpler service model through as a lower commission.
This is the pricing problem examined more fully in the history of fixed commissions and traditional brokerage economics. May Day changed who could decide the charge. It did not prescribe what that charge should become.
Why Pressure for Change Grew
The growth of institutional investing made the old arrangement harder to defend. Mutual funds, pension funds and insurance companies brought large pools of money to the market. Their requirements differed from those of an individual placing an occasional order, and their trading business gave them a reason to challenge expensive execution arrangements.
Institutions also pursued alternatives. Membership of regional exchanges and trading arrangements outside the conventional NYSE route offered ways around parts of the established structure. The SEC Historical Society’s account of institutional investors and the paperwork crisis documents these pressures, alongside the operational failures that damaged confidence in existing market arrangements.
The economic objection was straightforward. A larger order need not cost proportionately more to process. If transaction value rises much faster than the work required, a compulsory charge can prevent customers from negotiating a price that reflects that difference.
That does not make every large trade cheap to handle. Finding enough shares without moving the market can be difficult. But it creates a question for the buyer and seller of brokerage services: should an exchange schedule settle the price, or should the parties assess the work involved?
There was also a distinction between protecting investors and protecting brokerage revenue. A profitable broker might offer valuable service. That alone did not establish that every customer should have to pay a protected minimum.
The Road to May 1, 1975
May Day followed years of scrutiny rather than a sudden regulatory turn. Public commission-rate hearings in 1968 had questioned whether fixed charges needed to continue. The Justice Department pressed against the system, while congressional investigations examined commissions alongside failures in clearing, settlement and brokerage operations.
On September 11, 1973, the SEC announced that it expected exchanges to remove fixed commissions before May 1, 1975, and would act if they did not. Resistance remained. By January 1975, almost all exchanges had declined the SEC’s request to make the required changes voluntarily. These steps appear in Commissioner A. A. Sommer Jr.’s contemporary account of the approaching reform.
The dispute was therefore about more than choosing a different number on a rate card. It concerned whether the exchange should retain collective control over members’ customer prices.
There were reasonable questions to ask about the transition. Would aggressive discounting support a sustainable business? Would customers distinguish between inexpensive execution and more costly advice? Those questions did not require preserving fixed prices indefinitely. They did mean that removing the rule and observing the results were separate tasks.
What Rule 19b-3 Actually Changed
Rule 19b-3 prohibited national securities exchanges from requiring members to charge fixed commission rates for transactions executed on, or through, exchange facilities. The May 1, 1975 deadline covered public rates and clearance charges. Floor brokerage rates charged between members received a later deadline of May 1, 1976. These boundaries are set out in the Federal Register publication of Rule 19b-3, beginning on page 7394.
The extra year for floor brokerage is a useful correction to the shorthand that every fixed securities commission disappeared on one day. May Day was the decisive public-customer change, not a simultaneous reset of every charge between market participants.
Nor did the rule require brokers to work without commissions. A firm could still charge for execution. What disappeared was the exchange’s requirement that it charge a fixed rate.
“Negotiated commissions” also needs careful reading. Freedom to compete does not mean every customer must bargain over each order. A firm can set its own published prices and customers can accept them, reject them or take their business elsewhere. Independent pricing, rather than compulsory haggling, is the distinction.
Who Received the Early Savings?
The benefits were uneven. In March 1976, institutional commissions measured as a percentage of order value were approximately 35% below the pre-May level. The comparable decline for individual customers was about 2%. Measured per share, the reductions were approximately 30% and 6%, respectively. The SEC’s 1976 annual report on negotiated commission charges reports these different measures.
These figures should not be collapsed into a single claim that commissions “fell by 35%.” Customer type matters. So does the denominator: commission per share is not the same measure as commission relative to the value traded.
One plausible economic explanation for institutions’ stronger early position is their ability to offer repeat business and compare competing execution proposals. An individual with an established broker might place greater value on continuity, advice or convenience. That is an explanation of bargaining incentives, not a claim that every institution negotiated well or every individual paid too much.
The evidence supports a narrower but useful judgment: removing the price floor produced substantial early savings for institutional customers, while the average reduction for individuals was much smaller. Permission to compete did not deliver identical prices or identical benefits.
How Lower Commissions Changed a Trading Decision
A hypothetical example shows why the reform mattered without pretending to reproduce a historical rate card.
Suppose an investor buys $5,000 of stock, then sells it later at the same gross value. One broker charges $60 for each transaction; another charges $25. Assume identical execution prices and ignore taxes and other costs.
| Commission cost | $60 per transaction | $25 per transaction |
|---|---|---|
| Purchase | $60 | $25 |
| Sale | $60 | $25 |
| Combined commissions | $120 | $50 |
| Combined commissions relative to $5,000 | 2.4% | 1.0% |
The difference is $70. On a trade with no gross profit, both investors lose money after commissions, but one loses less. On a profitable trade, the lower charge leaves more of the gain with the investor.
This example also shows why comparing the purchase commission alone is incomplete. Entering and leaving a position can each generate a charge. A modest saving repeated across transactions can matter more than an impressive discount on a single order.
Price still needs to be compared with service. If the more expensive arrangement includes advice the investor wants, the decision is not automatically settled by the lower number. May Day made that comparison possible without an exchange minimum deciding the matter in advance.
Brokerage Became a More Explicit Choice of Service
Competitive pricing made it easier to distinguish between paying for execution and paying for a broader relationship. An investor who did their own analysis could look for a lower-cost transaction service. Someone who wanted recommendations and regular assistance could assess whether a fuller service justified its charge.
The reform also affected how firms presented themselves. Research into May Day traces changes in financial advertising as negotiated commissions altered the industry’s competitive arguments. The historical study Ending a NYSE Tradition examines that connection, including the changing position of former NYSE president Robert Haack on rate deregulation.
The business logic is clear: once price becomes a choice, a firm must explain either why it costs less or why it deserves more. A recognizable name and a familiar representative can still have value, but neither makes the price question disappear.
The longer development belongs to the history of discount stock brokers. The narrower importance of May Day was that an exchange-imposed minimum no longer blocked a broker from competing through a cheaper service offering.
The Difficult Question of Paying for Research
Research exposed a harder pricing problem. Brokerage commissions had supported services beyond executing orders. If execution prices fell sharply, firms had to consider how analysis and other work would be funded.
By May 28, 1975, SEC chairman Ray Garrett Jr. was discussing aggressive institutional price cuts, the uncertain cost of basic brokerage and the threat to research funding. His address on the initial experience of negotiated rates also cautioned that comprehensive data were not yet available. Early impressions were not a settled verdict.
There are two distinct purchases here. One is carrying out a transaction. The other is helping a customer decide which transaction, if any, to make. Their value need not move together.
Competitive execution prices therefore did not prove that research had no value. They forced a more awkward question: who wanted it enough to pay for it? Equally, a customer who did not want research had reason to question why it should be included in their execution bill.
Why May Day Remains a Brokerage Turning Point
The lasting distinction is between a price set collectively through exchange rules and a price a brokerage firm must defend to its customers. That is why May Day deserves its own place in the history of stock brokers, rather than being treated simply as an early chapter in cheaper trading.
The reform’s lesson is not that the lowest commission always identifies the best broker. It is that execution, advice, research and account service should not be treated as if every customer values them equally.
May Day changed the starting point of that discussion. Instead of asking whether a commission complied with an exchange schedule, customers could ask whether another firm offered a better price for the service they actually wanted. The broker still had a bill to present. It now had a stronger reason to justify it.