Self-Regulatory Organizations; Miami International Securities Exchange, LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Exchange Rule 515A, MIAX Price Improvement Mechanism and PRIME Solicitation Mechanism
§ 01 Summary
The SEC gives notice that MIAX filed an immediately effective rule change amending Exchange Rule 515A, which governs the MIAX Price Improvement Mechanism and PRIME Solicitation Mechanism for options orders. The change affects how MIAX participants use those auction and solicitation mechanisms, rather than creating a broader SEC rule applicable across markets.
§ 02 Why this matters
Because the SRO rule change is designated immediately effective, MIAX members that submit or respond to PRIME and PRIME Solicitation orders must comply with the amended Exchange Rule 515A procedures. The obligation is narrow to MIAX options trading mechanics, so it is notable but not a major regulatory change.
§ 03 Topics
§ 04 Affected entities
- agency: SEC
- company: Miami International Securities Exchange, LLC
- industry: options-broker-dealers
- industry: securities-exchanges
- statute: Securities Exchange Act of 1934
§ 05 Matching feeds
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§ 06 Source document
Read the full Federal Register entry on federalregister.gov.
Show classifier input (what GPT-5.5 saw)
Type: Notice Agencies: Securities and Exchange Commission Citation: 91 FR 33011 Title: Self-Regulatory Organizations; Miami International Securities Exchange, LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Exchange Rule 515A, MIAX Price Improvement Mechanism and PRIME Solicitation Mechanism
Classified Jun 2, 2026 by gpt-5.5. Fetched Jun 2, 2026.
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