Cboe EDGA: Equities Exchange That Flipped

Key Takeaways

• Cboe EDGA is a U.S. equities exchange that converted from inverted to maker-taker on November 1, 2024.
• An inverted venue charges makers and pays takers; maker-taker reverses that.
• After the switch, EDGA's displayed size and presence at the best quote grew sharply.
• The change shows how fee models directly shape where resting liquidity gathers.

What It Is

Cboe EDGA is a registered national securities exchange for U.S. stocks. Like its sister EDGX, it comes from the Direct Edge lineage, converting from an electronic communication network into a national securities exchange in 2010. Direct Edge merged with BATS, and the combined firm joined Cboe in 2017.

For years EDGA ran an inverted fee model, charging traders who added liquidity and paying those who removed it. On November 1, 2024, it switched to a standard maker-taker model, paying a rebate for adding liquidity and charging a fee for removing it.

The Intuition

Fee models are not cosmetic. They decide where resting orders gather and how aggressively takers fill. An inverted venue rewards fast, aggressive orders by paying the taker. A maker-taker venue rewards patient, resting orders by paying the maker.

EDGA's conversion is a clear case study. By flipping from paying takers to paying makers, EDGA changed the kind of order flow it attracts. The goal was to draw more resting liquidity and improve its standing at the national best bid and offer. Watching what happened after the switch shows the incentive working in practice.

How Cboe EDGA Works

Before the conversion, EDGA used inverted pricing: the maker paid a fee and the taker earned a rebate. After November 1, 2024, the cash flows reversed.

Before (inverted):    add = fee,    remove = rebate
After (maker-taker):  add = rebate, remove = fee

Under the new model a trader who posts a resting limit order earns the add rebate when it fills, and a trader who sends a marketable order pays the take fee. EDGA still matches on price-time priority and honors the national best bid and offer, so the change affected economics and routing behavior rather than the prices traders see.

Cboe reported that after the switch EDGA's displayed liquidity and quote presence rose. Its weighted average size at the best quote grew, its presence at the national best bid and offer increased, and midpoint executions climbed, all consistent with the maker rebate pulling in more resting orders.

Worked Example

Imagine a trader posting 1,000 shares as a resting buy order on EDGA.

Under the old inverted model, that resting buy order was a maker order and cost a fee when it filled. The trader paid to provide liquidity, which discouraged posting and kept displayed size thin.

After the November 2024 conversion, the same resting buy order earns a rebate when it fills. The trader is now paid to post. With posting rewarded rather than penalized, more participants display orders on EDGA, the book deepens, and the venue spends more time at the best quote. That is exactly the shift Cboe described after the conversion.

Common Mistakes

1. Assuming EDGA is still inverted. Older references describe EDGA as an inverted venue, but it moved to maker-taker on November 1, 2024. Check the date on any source.

2. Confusing EDGA with EDGX. Both come from Direct Edge, but they are separate exchanges with different pricing. EDGA is the one that recently converted to maker-taker.

3. Thinking a fee flip changes the quote you pay. The conversion changed rebates and fees, not the national best bid and offer. Your execution price still respects the protected quote.

4. Underrating the routing impact. A fee model flip changes where smart-order routers send passive and aggressive orders. The venue's market share and quote presence can move noticeably as a result.

5. Treating market share as fixed. EDGA is one of many competing U.S. venues, and its share shifted after the conversion. No single exchange holds an outsized portion of total volume.

Frequently Asked Questions

What is Cboe EDGA in simple terms? Cboe EDGA is a U.S. stock exchange that switched from an inverted fee model to a maker-taker model in November 2024. It now pays a rebate to traders who post resting orders and charges a fee to those who remove them.

How does Cboe EDGA affect investment decisions? For most individuals it is invisible because a broker routes the order, but the new maker rebate draws resting liquidity, which can improve passive fill odds. The conversion also shifted where routers send orders.

What is a real-world example of Cboe EDGA in action? After the November 2024 switch, Cboe reported that EDGA's displayed size and time at the best quote rose, showing how rewarding makers instead of takers pulls in more resting orders.

How can investors use Cboe EDGA effectively? If your broker exposes routing, posting a liquidity-adding limit order now earns a rebate on EDGA rather than the fee it once charged, which can lower the cost of patient orders.

How is Cboe EDGA different from Cboe BYX? EDGA is now maker-taker, paying makers and charging takers. BYX remains an inverted venue, charging makers and paying takers, so they sit on opposite sides of the fee model after EDGA's conversion.

Sources

1. Cboe. "EDGA Equities Moves to Maker/Taker Fee Model (Release Notes)." https://cdn.cboe.com/resources/release_notes/2024/Cboe-EDGA-Equities-Moves-to-Maker-Taker-Fee-Model.pdf
2. Cboe Insights. "Flipped & Flowing: Liquidity Growth on EDGA's Maker-Taker Conversion." https://www.cboe.com/insights/posts/flipped-flowing-liquidity-growth-on-edg-as-maker-taker-conversion/
3. Cboe. "U.S. Equities Exchanges Overview." https://www.cboe.com/us/equities/
4. Cboe Insights. "The Value of Inverted Exchanges." https://www.cboe.com/insights/posts/the-value-of-inverted-exchanges/

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.