Tick‑Size Pilot Midpoint: What Investors Should Do Now — Sept 2026

Who, what, when, where, why: The New York Stock Exchange and Nasdaq launched a coordinated tick‑size pilot for roughly 300 small‑cap and micro‑cap U.S. equities on June 1, 2026. The nine‑month trial tests wider minimum price increments (5¢, 10¢ and 25¢ tiers) to see whether larger ticks improve displayed liquidity and price discovery. The program’s formal mid‑point (120‑day) review falls on or around Sept. 29, 2026, and the pilot is scheduled to end Feb. 28, 2027.

Why this matters now

The trial is the highest‑profile tick‑size experiment since the SEC’s 2016 pilot and directly targets the market microstructure dynamics that matter to retail traders, active small‑cap managers and market makers. If wider ticks produce materially thicker displayed size and lower overall execution cost (effective spread), exchanges could push for broader rule changes; if not, the pilot will likely be narrowed or discontinued. The mid‑point report is the first comprehensive checkpoint where exchange‑published metrics and participant feedback will be weighed together.

What the pilot does — unchanged from launch

• Tiered tick grid: affected names trade on a 5¢, 10¢ or 25¢ minimum increment instead of the standard $0.01.
• Scope: roughly 300 securities drawn mostly from the Russell 2000 and selected micro‑caps; participation is mandatory for selected tick‑pilot securities.
• Measurement: exchanges will publish periodic statistics covering quoted spreads, displayed depth, order cancellation/message traffic and effective spreads; a 120‑day mid‑point review and a final nine‑month report conclude the experiment.

What’s been visible through early September

Because the pilot began in June, market participants have had three months of new price increments to observe. The mechanical effects are straightforward and already evident in trade decisioning:

• Quoted spreads widen by construction. A stock quoted at $3.50 bid / $3.51 ask under penny ticks cannot display a $0.01 inside when minimum increments move to $0.05 — the inside becomes, for example, $3.50 / $3.55. That increases explicit spread cost (from $0.01 to $0.05 in this example), and raises the percent cost of immediacy for low‑priced stocks.
• Displayed size at the inside has increased in many names. Market makers and liquidity providers often post larger displayed sizes when ticks are larger because price priority becomes more valuable; anecdotal reports from trading desks and dealer firms confirm thicker top‑of‑book sizes in a number of pilot names.
• Routing logic is shifting. Broker smart‑order routers and retail platforms have updated algorithms to account for the new tick grid, which has already changed venue‑level execution share for some affected names.

How investors are being affected

The tradeoffs vary by strategy.

Retail investors

Retail orders with immediate execution (market orders) will usually see higher explicit spread cost in pilot names; using limit orders becomes more valuable. For small‑dollar positions the absolute cost change may be modest, but percentage costs on low‑priced names can be meaningfully higher. Platforms that advertise “fractional” execution will still route into the stock market where the tick grid applies; fractional execution does not negate a wider tick at the venue level.

Active small‑cap funds and ETFs

Managers that trade blocks in pilot names may see higher implementation shortfall when using aggressive liquidity taking. Index providers are not changing inclusion, but ETF creation/redemption and rebalancing committees are re‑optimizing crossing and timing strategies to avoid liquidity squeeze windows around large index events.

Market makers, HFTs and dealers

Some high‑frequency strategies that previously profited from sub‑penny price improvement must adapt execution tactics; others are posting more displayed size where the economics justify it. Where tick widening compresses margin, some liquidity providers will stay on the sidelines or offer smaller sizes.

What to watch at the 120‑day review (Sept. 29, 2026)

The mid‑point report is the first time the exchanges will compile and present the pilot’s cross‑section metrics together. Key items to examine when the exchanges post their dataset and methodology:

• Effective spreads: execution price vs. mid‑quote — this captures realized execution cost, not just displayed inside spreads.
• Displayed depth at the inside and top three levels: net change in posted sizes, segregated by tick tier.
• Order cancellation and message traffic: does the pilot reduce ephemeral quoting and the message burden on matching engines?
• Retail fill rates and sizes: whether retail orders trade at the inside and the size executed at that price.

Practical checklist — what individual and DIY investors should do now

• Prefer passive limit orders for pilot names. When possible, use limit orders set to the new tick grid rather than market orders to control execution cost.
• Widen limit price grids. If you use automated limit strategies, update tick‑step parameters to avoid frequent, useless order cancellations.
• Ask your broker for execution statistics. Retail and advisory platforms will update routing logic; request expected fill rates and venue mix for pilot securities if you trade them regularly.
• Watch ETFs and rebalances. If you own small‑cap ETFs, track intraday premium/discount behavior around rebalances and creation activity; consider limit crosses for large adjustments.
• Update implementation‑shortfall models. Active managers should re‑calibrate slippage and market impact assumptions by tick tier when planning trades.

Reactions so far

At launch, NYSE and Nasdaq framed the pilot as an empirical test; by the mid‑point both exchanges will publish the metrics that will inform regulatory and industry debate. Market‑structure observers point to the SEC’s 2016 tick‑size pilot, which produced mixed results — larger ticks tended to increase displayed depth but did not uniformly lower execution costs — as the key precedent. That history has made the Sept. 29 review especially important for policymakers and firms deciding whether to adopt any permanent tick changes.

What’s next — timelines and likely scenarios

The exchanges will present the 120‑day dataset and methodology in the mid‑point package; expect commentary from sell‑side firms, ETF sponsors and industry groups in the days that follow. If effective spreads fall or remain flat while displayed depth increases meaningfully, exchanges will argue for wider ticks as a net benefit. If effective spreads rise materially without depth gains, the pilot will likely be narrowed or discontinued at the final report in February 2027.

FAQ — common questions investors are asking

When is the pilot mid‑point report released?

The 120‑day review falls on or around Sept. 29, 2026. Exchanges have committed to publish periodic pilot statistics and will post the mid‑point dataset and methodology around that date.

Will wider ticks increase my trading costs permanently?

Not necessarily. Wider quoted spreads are a mechanical result of larger ticks, but effective spreads (actual execution cost) can fall if displayed depth at the inside rises and fewer trades occur at inferior prices. Assess this on a stock‑by‑stock basis and prefer limit orders until the mid‑point data are published.

Do these rules affect options and crypto markets?

No. The pilot changes only equity minimum price increments for the selected U.S. small‑cap securities. Options and crypto markets operate under separate price increment regimes and are unaffected by this pilot.

Should I change my long‑term small‑cap strategy?

Long‑term investors may be largely unaffected by short‑term tick changes, but active traders and funds that frequently trade small‑cap names should review execution policies and re‑price liquidity assumptions through Feb. 28, 2027 — the pilot’s scheduled end date.

For stock‑market investors who trade or hold small‑cap equities, the coming weeks — and the Sept. 29 mid‑point disclosure — will provide the first systematic evidence of whether a larger tick grid meaningfully improves posted liquidity without raising net trading costs. In the short term, update order practices, check broker routing disclosures and prepare to use limit strategies on affected names.