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Saudi Exchange expands market order execution to five price levels

Saudi Exchange expands market order execution to five price levels

Rule Changes

Change covers the Main Market and Nomu parallel market; aimed at boosting immediate order fills

Yesterday: New market order mechanism takes effect

Overview

Updated 53 minutes ago

Until October 4, 2026, a market order on the Saudi Exchange filled only against quantity at the best available price, with the remainder converted into a limit order. As of that date, the order can execute across up to five price levels to capture a fuller fill.

The change covers the Main Market and the Nomu parallel market. The Saudi Exchange says it increases the volume of market orders executed immediately by accessing additional liquidity across broader price increments. The derivatives market is unchanged.

Why it matters

Market orders on Saudi Arabia's Main Market and Nomu now fill across five price levels, cutting partial-fill conversions for investors.

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Key Indicators

5
Maximum price levels for market order execution
Up from one level (the best available price) under the previous mechanism.
272
Companies listed across both affected markets
Total listed on the Main Market and Nomu as reported on the first trading day under the new mechanism.
2
Markets covered by the update
Main Market and Nomu parallel market; the derivatives market keeps its existing mechanism.

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People Involved

Organizations Involved

Timeline

2 events Latest: Yesterday
  1. New market order mechanism takes effect

    Latest Rule Change

    Market orders on the Main Market and Nomu begin filling across up to five price levels. Any unexecuted remainder converts to a limit order at the last execution price.

  2. Tadawul announces market order mechanism update

    Announcement

    The Saudi Exchange said market orders would begin executing across up to five price levels from October 4. The update replaces single-price execution on the Main Market and Nomu.

Scenarios

1

Tadawul reports higher market order fill rates

Likely Resolves by Apr 4, 2027

Discussed by: Tadawul executives and analysts quoted in Asharq Al-Awsat and Mubasher coverage

If the mechanism works as intended, market orders fill at higher rates because they can access liquidity up to five price levels deep. Tadawul's trading statistics would show the average executed quantity per market order rising, and its investor communications may cite improved fill rates as evidence the update met its goal.

2

Tadawul amends or suspends five-tick execution

Unlikely Resolves by Apr 4, 2027

Discussed by: Market microstructure analysts and participants quoted in regional financial media

If the wider execution range produces unintended effects - sharper price moves from a single order walking through five levels, or more orders converting to limit orders at worse prices - Tadawul could tighten the range or revert to single-price execution. The exchange has not signaled any such concern, and this scenario would require evidence of problems in trading data or participant feedback.

3

Mechanism stays in place with no measurable change

Possible Resolves by Apr 4, 2027

Discussed by: Market observers noting market orders are a small share of Saudi trading volume

Market orders may account for a modest share of Saudi equity volume, so the mechanism change could have limited visible impact on overall trading outcomes. The rule would remain in effect, but without published evidence of improved fill rates, the update becomes a technical refinement rather than a measurable shift in market behavior.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

May 2010

Flash Crash (May 2010)

On May 6, 2010, US stocks plunged roughly 1,000 points in minutes as market orders overwhelmed thin liquidity, with the Dow briefly dropping about 9% before recovering. The CFTC and SEC found that a large sell order executed too aggressively against insufficient buy-side liquidity triggered the cascade.

Then

Exchanges added staggered circuit breakers and tightened execution rules.

Now

US markets adopted limit-up/limit-down price bands that pause trading when prices move beyond set thresholds.

Why this matters now

Shows how exchanges dial order execution mechanisms to balance execution speed against price stability. Saudi Arabia's move expands the range for market orders within a capped band - the same lever US regulators turned the other direction after 2010.

2019

Saudi Arabia joins MSCI emerging markets index (2019)

Saudi Arabia's stock market joined the MSCI emerging markets index in 2019 after the exchange introduced infrastructure upgrades, including new settlement and custody arrangements, to meet international accessibility standards. Passively managed funds tracking the index then had to buy Saudi stocks.

Then

Billions of dollars in foreign inflows followed the index inclusion.

Now

Foreign ownership of Saudi-listed equities rose, and the market continued upgrading its structure to attract international investors.

Why this matters now

The order mechanism update is part of the same modernization arc - improving market infrastructure and execution quality to keep Saudi Arabia competitive for international capital.

Sources

(8)