Introduction
A zero plus tick (also called a zero uptick) occurs when a trade executes at the same price as the immediately preceding trade, but that price is higher than the most recent trade that occurred at a different price. It’s a microstructure signal used by traders, market regulators, and surveillance systems to infer short-term price momentum and to enforce short-sale restrictions.
Simple definition and example
– Definition: A zero plus tick = current print price = previous print price, and that price > the last trade at a different price.
– Example: Trades print at $10.00, $10.01, $10.01. The second $10.01 print is a zero plus tick because it matched the previous print ($10.01) while that price is higher than the prior different price ($10.00).
Opposite: zero minus tick (zero downtick)
– Definition: Current print equals prior print, but that price is lower than the last trade at a different price. Example: $15.00, $14.95, $14.95 — the second $14.95 is a zero downtick.
Why ticks (including zero upticks) matter
– Short-term momentum: Zero upticks indicate the price held at a higher level after moving up, suggesting resumed or sustained buying interest.
– Liquidity signal: Frequent zero upticks are often associated with active, liquid trading (many trades at the same price), producing tighter spreads and smoother price movement.
– Regulatory and execution implications: Historically, “uptick”/“zero uptick” rules affected when short sales could be executed. Modern regulations (see Rule 201 below) use related concepts to limit how short sales can be executed during sharp price declines.
Regulatory context: uptick rule history and the modern alternative
– Historic uptick rule (Rule 10a-1): From 1938 until 2007 the SEC required short sales to be executed on an uptick or zero uptick to limit short sellers from adding downward momentum to a falling stock.
– Repeal and new rule: The original rule was repealed in 2007. In 2010 the SEC adopted an “alternative uptick rule” (Rule 201) — the Short Sale Price Test Restriction — that activates when a security falls 10% or more from the previous day’s close. While not identical to the old uptick rule, Rule 201 restricts short sales to prices above the national best bid, preventing short sellers from “hitting the bid” (i.e., removing liquidity at or below the bid) while the restriction is in force.
– Practical effect: Under Rule 201, when triggered, short sales must be entered at a price above the best bid (essentially requiring the short to add liquidity rather than remove it). See SEC Rule 201 (final rule adopted 2010) for details.
How traders see ticks in practice
– Time & Sales (prints): Ticks are seen in the exchange “prints.” A print repeating the same price as the previous print but higher than an earlier different price is a zero uptick.
– Level 1 / Level 2 / depth data: Shows current bid/ask and recent trades; helps you judge where prints are relative to the national best bid and offer.
– Market data feeds: Professional feeds and trading platforms can tag upticks/downticks, show tickers and coloring for up/down prints, and allow conditional orders tied to ticks.
Practical steps — how to use zero upticks in trading and compliance
1. Know the distinction and why it matters
• Learn the definitions: uptick, zero uptick, downtick, zero downtick.
• Understand regulatory rules that affect short-sale execution (Rule 201) and whether a stock is in a short-sale restriction period.
2. Monitor real-time prints (time & sales)
• Watch the time & sales feed to see whether a trade is an uptick, downtick, zero uptick, or zero downtick.
• Use this information to confirm short-term momentum before placing an aggressive order.
3. Set order types appropriately
• To avoid crossing the market and removing liquidity (especially under Rule 201), use limit orders placed above the national best bid (for short sales) rather than market orders that hit the bid.
• Use passive order types (post-only, maker-taker-aware limit orders) if your strategy requires adding liquidity or if short-sale restrictions may be triggered.
4. Use conditional triggers for short entries
• If your platform supports conditional execution, place a short order that only sends to market when the last print was an uptick (or when price is above the national best bid), simulating the old uptick behavior and complying with short-sale-price-test rules.
5. Account for liquidity and spread
• Frequent zero upticks are a liquidity signal — you may get fills near the quoted price with smaller slippage.
• Thinly traded stocks with few zero upticks can have wide spreads and higher slippage; adjust sizing and risk accordingly.
6. Understand the regulatory environment before shorting
• Check whether Rule 201’s 10% circuit is in effect for the symbol you trade. Broker and exchange feeds often flag stocks under short-sale restrictions.
• Even when Rule 201 is not active, some exchange-specific rules or broker-dealer compliance systems may limit shorting behavior.
7. Use zero upticks as confirmation, not the sole signal
• Combine tick information with broader technical and fundamental analysis. Zero upticks are a microstructure indicator and can be noisy in isolation.
• Consider volume, trend, support/resistance, and order-book depth along with ticks.
8. Protect positions and manage risk
• Always place stop-loss or predefined exit rules. Microstructure signals can reverse quickly.
• For smaller-cap or volatile names, reduce size or widen risk parameters to account for sharp moves.
Practical examples (illustrative)
– Example 1 — Identifying a zero uptick:
Trades print: $45.00 → $45.10 → $45.10. The second $45.10 is a zero plus tick (zero uptick).
– Example 2 — Rule 201 scenario:
Stock XYZ has dropped 10% from the prior close and the short-sale price test is active. The national best bid is $20.00, ask $20.01. To short, you must place your order at a price above $20.00 (e.g., $20.02 limit) — you cannot short by aggressively hitting the $20.00 bid.
How zero upticks fit into technical analysis and short-selling
– Technical traders: May use uptick patterns (and repeat prints) to identify short-term support, momentum continuation, or to time entries/exits when combined with candlesticks, moving averages, or order-flow analysis.
– Short sellers: Historically restricted by uptick rule; today they must respect Rule 201 during circuit-triggered restrictions and follow firm/broker compliance. Zero upticks can influence whether an order is fillable immediately and whether it would remove liquidity.
Limitations and caveats
– Micro-noise: Single prints or a few zero upticks can be noise; they don’t guarantee trend continuation.
– Market structure changes: Decimalization, electronic trading, and high-frequency trading changed how prints behave; interpret ticks in the context of the current market microstructure.
– Data latency: Retail-level data can have delays; for precise timing and tick classification, use reliable, low-latency feeds and exchange-reported prints.
Bottom line
A zero plus tick (zero uptick) is a simple but informative microstructure signal indicating the price has held at a higher level after moving up. For most traders it’s one of many tools for judging short-term momentum and liquidity. Its practical importance is greatest when short-sale rules or price-test restrictions are relevant: during those times, how a trade ticks (uptick, zero uptick, or downtick) affects whether and how a short sale can be executed. Combine tick information with broader analysis, use appropriate order types, and follow regulatory and broker guidance when shorting.
References
– Investopedia: “Zero Plus Tick” — Laura Porter.
– U.S. Securities and Exchange Commission: Final rule — Short Sale Price Test Restriction (Rule 201), 2010.
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.