Wall Street Regulation in 2026: From Market Structure Rules to Crypto ETFs
For most of the past decade, “market structure” has been background noise to US equity investors. In 2026, it is back in the foreground, alongside another long‑running regulatory saga: whether crypto belongs in mainstream portfolios. Together, the SEC’s moves on trading rules and crypto ETFs are reshaping how risk is expressed in US stocks.
On the equity side, the Commission has spent several years reworking the plumbing around tick sizes, access fees, and payment for order flow (PFOF). In late 2024 the SEC adopted amendments to lower the minimum pricing increment for many NMS stocks from 1 cent to 0.5 cents via changes to Rule 612 and cut the cap on access fees from $0.003 to $0.001 per share. Reform advocates such as Better Markets welcomed the move, arguing that narrower tick sizes and cheaper access to protected quotations would reduce transaction costs for investors and make it harder for venues to extract economic rents from locked‑in order flow.
At the same time, the SEC has stopped short of banning PFOF, despite pressure after the 2021 meme-stock episode. A December 2024 Bloomberg report noted that the Commission would allow PFOF arrangements to continue, favouring greater competition at the order level and enhanced transparency over an outright prohibition. A staff white paper on PFOF prepared by the SEC’s Division of Economic and Risk Analysis underscores why the topic is sensitive: it finds that routing changes can alter daily trading costs by millions of dollars and that similar dynamics in crypto markets carry systemic implications.
For listed equities, these reforms matter less for fundamentals than for micro‑level liquidity and execution quality. Narrower tick sizes and lower access fees can compress spreads and make it easier to trade mid‑caps and less liquid names without large price impact, while the continued use of PFOF means that a significant share of retail flow will still be internalised by wholesalers rather than interacting with the public quote. In practice, that keeps the US market’s fragmented structure intact but tweaks its economics at the margin in favour of end investors.
On the crypto side, the SEC has taken two landmark steps in quick succession. In January 2024 it approved 11 spot Bitcoin ETFs, allowing issuers to list physically backed Bitcoin funds on major exchanges after years of futures-only products. In May 2024 it went further, green‑lighting eight spot Ether ETFs via accelerated rule changes for listings on NYSE Arca, Nasdaq and Cboe BZX. These decisions mark a decisive shift in the regulatory stance: instead of keeping crypto at arm’s length, the SEC now supervises its integration into the ETF ecosystem.
The spillover to equities operates through two channels. First, brokerage and asset‑management stocks with strong ETF franchises have seen new fee‑income opportunities from crypto‑linked products, albeit from a small base relative to their overall business. Second, the availability of spot ETFs has changed how retail and some institutional investors express macro and inflation views, diverting a portion of flows that might previously have gone into gold miners, high‑beta tech, or small‑cap speculative names.
Put together, the SEC’s 2026 regulatory landscape is not about tearing up Wall Street’s playbook but about incremental shifts: modestly fairer and cheaper equity execution, continued tolerance for PFOF within tighter guardrails, and the formal admission of Bitcoin and Ether into the ETF mainstream. For stock investors, the key is less the headline fights and more the way these rules shape where liquidity sits, how retail flow is intermediated, and which listed firms are positioned to monetise the structural shift towards ETFs and digital assets.