MEMX sets 2026 market-wide circuit breaker and SIP failover test schedule

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01.07.2026

MEMX sets 2026 market-wide circuit breaker and SIP failover test schedule — 2026 Circuit Breaker Tests Set

U.S. equity market participants are preparing for a new round of industrywide resilience testing in 2026, with MEMX outlining member participation requirements for market-wide circuit breaker exercises. The exchange says certain designated members must take part in at least one industrywide MWCB test during the testing year, while all members are encouraged to join.

Highlights

MEMX and other market participants will conduct SIP data center failover and MWCB level 1 and 2 testing on July 25, 2026.
The 2026 SIP schedule includes a full circuit breaker test (levels 1, 2, and 3) on September 12, 2026, plus combined SIP failover and MWCB testing on December 12, 2026.
Certain MEMX members must participate in at least one industrywide MWCB test annually, with December 12, 2026 now the revised session date.

July and later 2026 test schedule

As reported by MEMX Alerts & Notices, the Securities Information Processors, or SIPs, will conduct data center failover testing together with Market-Wide Circuit Breaker, MWCB, level 1 and level 2 testing on Saturday, July 25, 2026, and MEMX will participate in coordination with other market participants under its published test script.

MEMX says the current SIP schedule for the 2026 testing year also includes an MWCB level 1, level 2 and level 3 test on Saturday, September 12, 2026, followed by another SIP failover and MWCB level 1 and level 2 test on Saturday, December 12, 2026.

Member obligations and market impact

Certain members designated by MEMX are required to participate in at least one industrywide MWCB test each testing year and to verify that participation. The exchange also notes that December 12, 2026, is a revised date, replacing the previously scheduled December 5, 2026 session.

The testing program is part of broader market infrastructure readiness efforts designed to check how exchanges and participants respond to system failovers and circuit breaker scenarios. MEMX directs firms with questions about mandatory participant designation to contact its compliance team, while operational questions should be raised with Market Operations.

The FCC’s planned Upper C-Band spectrum auction is a key step in expanding U.S. 5G capacity, with regulators setting out a timeline and rules for clearing and reallocating mid-band airwaves. Our earlier coverage highlighted that the proposal also includes measures to address incumbent uses of the band, including aviation altimeter upgrades and compensation for satellite operators during the transition.

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