Cboe EDGX: High-Rebate Equities Exchange

Key Takeaways

• Cboe EDGX is a maker-taker equities exchange that offers high rebates for adding liquidity.
• It began as a Direct Edge ECN and became a registered exchange in 2010.
• High maker rebates draw resting orders, which routers value when seeking passive fills.
• EDGX competes with sister venue EDGA, which uses a different pricing structure.

What It Is

Cboe EDGX is a registered national securities exchange for U.S. stocks. Its roots are in Direct Edge, which ran two trading platforms, EDGA and EDGX. The SEC approved both to convert from electronic communication networks into national securities exchanges, and they launched as exchanges in 2010. Direct Edge merged with BATS in 2014, and the combined company became part of Cboe in 2017.

EDGX matches orders on price-time priority and uses a maker-taker fee model. It is positioned as the high-rebate venue in the Cboe equities family.

The Intuition

In a fragmented market where no exchange shows a better price than the others, venues compete on fees and incentives. EDGX leans into the maker side. By offering some of the larger add rebates among Cboe's equities venues, it tries to attract resting orders that deepen its book.

A trader who posts liquidity is the maker and earns the rebate. A trader who removes it is the taker and pays a fee. Deep resting liquidity makes a venue more useful to everyone, because incoming orders are more likely to find a fill there. The high rebate is the lever EDGX pulls to build that depth.

How Cboe EDGX Works

When you post a limit order priced away from the market, it rests on the EDGX book. If it fills, you collect the add rebate. When you send a marketable order, it executes against the resting book, you pay the take fee, and the resting maker earns the rebate.

EDGX (maker-taker):  high add rebate, take fee
EDGA (sister venue): different structure, lower-cost profile

EDGX layers volume tiers on its base rates, so members hitting daily share thresholds can earn larger rebates. Like all U.S. exchanges, EDGX must honor the national best bid and offer, so it competes on rebate size, speed, and order-type richness rather than on quoting a better price. Smart-order routers that want to capture maker rebates often post on EDGX, while routers that want fast fills may look to inverted or lower-cost venues first.

Worked Example

Suppose a stock is quoted 30.00 bid, 30.03 offer. You post a sell limit at 30.03 for 2,000 shares, which rests on the EDGX book as a maker order.

A buyer sends a marketable order that lifts your offer. Your 2,000 shares fill at 30.03, and you earn the EDGX add rebate on the full size. Because EDGX positions itself as a high-rebate venue, that rebate is a meaningful part of why a liquidity provider chooses to post there rather than on a venue with a smaller add credit.

The buyer, as the taker, pays the EDGX take fee. Had you instead crossed the spread to sell at 30.00 immediately, you would have paid the take fee yourself rather than earning the rebate.

Common Mistakes

1. Believing EDGX shows better prices. Every U.S. exchange honors the national best bid and offer. EDGX competes on rebate size, latency, and order types, not on a superior quote.

2. Confusing EDGX with EDGA. They are sister venues from the same Direct Edge lineage but use different pricing. EDGX is the high-rebate maker-taker venue; EDGA has a lower-cost profile.

3. Chasing the rebate blindly. A high add rebate is attractive, but a resting order only earns it if it fills. Posting where you do not get filled earns nothing.

4. Overlooking volume tiers. The headline rebate is a base rate. Members who hit daily share thresholds can earn more, so two firms can see very different economics on the same venue.

5. Assuming EDGX is dominant. It is one of many competing U.S. equities venues. No single exchange holds an outsized share of total volume.

Frequently Asked Questions

What is Cboe EDGX in simple terms? Cboe EDGX is a U.S. stock exchange that uses a maker-taker fee model and is known for high rebates to traders who post resting orders. It matches orders on price-time priority.

How does Cboe EDGX affect investment decisions? For most individuals it is invisible because a broker routes the order, but the high maker rebate draws resting liquidity, which can improve the odds of a passive fill. Active traders who post liquidity may favor EDGX to capture the larger rebate.

What is a real-world example of Cboe EDGX in action? A market maker concentrates resting quotes on EDGX to earn the high add rebate. When those quotes fill, the rebate adds to the firm's edge, which is why high-rebate venues attract heavy posting.

How can investors use Cboe EDGX effectively? If your broker offers routing choices, posting a limit order that adds liquidity on a high-rebate venue like EDGX can earn a larger credit, at the cost of giving up the certainty of an immediate fill.

How is Cboe EDGX different from Cboe EDGA? EDGX is the high-rebate maker-taker venue: it pays makers well and charges takers. EDGA is its sister venue with a lower-cost structure aimed at traders who prioritize cheaper or faster execution.

Sources

1. Cboe. "U.S. Equities Exchanges Overview." https://www.cboe.com/us/equities/
2. Cboe. "Order Types and Routing." https://www.cboe.com/us/equities/trading/offerings/order_types_and_routing/
3. Cboe Insights. "The Value of Inverted Exchanges." https://www.cboe.com/insights/posts/the-value-of-inverted-exchanges/
4. Cboe. "EDGX U.S. Equities Maker Opportunity Report." https://www.cboe.com/us/equities/market_statistics/maker_report/?mkt=edgx

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.