Any party to an included action that opposes coordination may serve and submit a memorandum and declarations in opposition to the petition. Any response in opposition must be served and filed at least nine court days before the date set for hearing.
Rule 3.525.Response in opposition to petition for coordination
Division 4. Parties and Actions · Chapter 7. Coordination of Complex Actions · Article 3. Petitions and Proceedings for Coordination of Complex Actions · Last amended 2007 · Last verified July 29, 2026
In one sentenceRule 3.525 lets any party to an included action file a memorandum and declarations opposing a petition for coordination, so long as the opposition is served and filed at least nine court days before the hearing.
Full Text of Rule 3.525
Plain-English Summary
Not every party wants their case folded into a coordination proceeding with other lawsuits. Rule 3.525 gives a party in that position a formal way to say so: a memorandum laying out the opposition, backed by declarations, filed with the court considering the petition.
The rule sets a firm deadline rather than a general standard. Whatever party wants to oppose coordination must serve and file its papers at least nine court days before the hearing on the petition, giving the petitioner and the coordination motion judge time to review the objection before argument begins.
Filing an opposition under this rule matters beyond making a party’s position known. Under Rule 3.527, a hearing on the petition becomes mandatory whenever any party opposes coordination, and the petition cannot be denied without one.
Frequently Asked Questions
Who can file an opposition to a petition for coordination?
Any party to an included action — one of the lawsuits the petition proposes to fold into the coordination proceeding — may serve and submit an opposition.
What is the deadline for filing an opposition?
Rule 3.525 requires the opposition to be served and filed at least nine court days before the date set for the hearing on the petition.
What does an opposition to coordination have to include?
A memorandum and declarations setting out the grounds for opposing the petition.
Does opposing coordination guarantee a hearing on the petition?
Yes. Under Rule 3.527(b), a hearing is required whenever a party opposes coordination, and the petition cannot be denied without one.
Amendment History
Rule 3.525 amended effective January 1, 2007; adopted as rule 1525 effective January 1, 1974; previously amended effective January 1, 2005; previously amended and renumbered effective January 1, 2007.
Source & verification. Rule text is reproduced verbatim from
the Judicial Council of California. Adopted by the Judicial Council of California.
Last verified July 29, 2026.
· Official source
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