California Anti-SLAPP Motions — When the Defense Actually Works (CCP §425.16)

A California defendant served with a complaint has 30 days to file a response. A defendant with a viable anti-SLAPP defense has 60 days to file the special motion to strike under California Code of Civil Procedure §425.16(f) — and that motion, if granted, ends the case before discovery, with mandatory attorney fees to the defendant.

It is the most consequential procedural tool in California civil practice and the one most often deployed incorrectly. The 60-day window encourages defendants to file aggressively; the “arising from” gateway in §425.16(b)(1) ensures that many of those filings fail at step one. The result is a procedural device whose surface mechanics (file the motion, recover fees) obscure the doctrinal complexity (the motion has to actually fit the case).

This is the practitioner-level framework for telling whether an anti-SLAPP motion is the right move — and what happens if it is.

What anti-SLAPP is for

The acronym is a 1992 invention: SLAPP stands for Strategic Lawsuit Against Public Participation. The California legislature enacted §425.16 to address a specific concern — that well-resourced plaintiffs were using meritless lawsuits to retaliate against, and silence, citizens who exercised their First Amendment rights of speech and petition. The statutory findings in §425.16(a) state the policy:

“[T]here has been a disturbing increase in lawsuits brought primarily to chill the valid exercise of the constitutional rights of freedom of speech and petition for the redress of grievances.”

The cure was a special motion to strike, available at the outset of the case, that requires the plaintiff to show the lawsuit has merit before being permitted to proceed. The procedural inversion is unusual — at no other stage of California civil practice does a plaintiff bear the burden of demonstrating likely success before discovery. Anti-SLAPP creates exactly that burden when the lawsuit arises from protected activity.

Practitioners use anti-SLAPP today in a much broader range of cases than the legislature originally contemplated. Defamation suits, intentional-interference suits, breach-of-contract suits where the alleged breach is communication, malicious prosecution suits, and a wide range of complaints arising from litigation conduct, regulatory filings, and public statements all routinely face anti-SLAPP motions. The doctrine has expanded outward; the procedural mechanics have remained stable.

The two-step framework

Every anti-SLAPP analysis is structured around two sequential burdens. The defendant has the first burden; the plaintiff has the second. If the defendant fails step one, the motion is denied and the case proceeds. If the defendant carries step one, the burden shifts and the plaintiff must satisfy step two — and failing step two ends the case.

Step 1: Did the cause of action arise from protected activity?

The defendant must show that the challenged cause of action “arises from” an act in furtherance of the defendant's right of petition or free speech under §425.16(b)(1). The four categories of protected activity are enumerated in §425.16(e):

• §425.16(e)(1): any written or oral statement or writing made before a legislative, executive, or judicial proceeding, or any other official proceeding authorized by law.
• §425.16(e)(2): any written or oral statement or writing made in connection with an issue under consideration or review by a legislative, executive, or judicial body, or any other official proceeding authorized by law.
• §425.16(e)(3): any written or oral statement or writing made in a place open to the public or a public forum in connection with an issue of public interest.
• §425.16(e)(4): any other conduct in furtherance of the exercise of the constitutional right of petition or the constitutional right of free speech in connection with a public issue or an issue of public interest.

The first two categories are broad and easily met. Filings in court, statements in administrative proceedings, communications with regulators — all routinely qualify. The third and fourth categories are where most anti-SLAPP fights happen, because “public interest” and “public forum” are fact-intensive concepts that the appellate courts have refined over decades.

The hardest step-one question is rarely whether the underlying conduct was protected. It is whether the cause of action arises from that protected conduct. The California Supreme Court's decision in Park v. Board of Trustees (2017) 2 Cal. 5th 1057 clarified the standard: the cause of action must be based on protected activity itself, not merely related to it or triggered by it. A breach-of-contract claim that incidentally involves protected speech does not arise from protected activity if the breach can be proven without reference to the speech.

This is where most anti-SLAPP motions fail. Defendants identify protected conduct in the factual background of the case and reflexively file the motion. The court reads the complaint, sees that the elements of the cause of action do not require proof of protected activity, and denies the motion. The defendant has accelerated their own discovery exposure by 60 days and triggered a fee shift to the plaintiff under §425.16(c)(1) if the motion is found frivolous.

Step 2: Does the plaintiff demonstrate a probability of prevailing?

Once the defendant carries the step-one burden, the plaintiff must establish a probability of prevailing on the cause of action. This is not a likelihood-of-success-on-the-merits inquiry; it is closer to a summary-judgment-light standard. The plaintiff must produce admissible evidence (declarations, documents, deposition testimony) showing the cause of action has “minimal merit.”

The court does not weigh credibility at this stage. It accepts the plaintiff's competent evidence as true and assesses whether, taken together, that evidence states a legally sufficient claim that could prevail at trial. If the plaintiff produces evidence supporting each element of the cause of action and the defendant's evidence does not, as a matter of law, defeat the claim — the motion is denied.

Step-two motions are won by defendants in cases where there is a clean legal defense (statute of limitations, immunity, privilege, lack of essential element) that the plaintiff cannot overcome with evidence. They are lost by defendants in close factual cases where the plaintiff has admissible evidence of a viable claim, even if the defendant disputes it.

The procedural mechanics that make anti-SLAPP unique

Three procedural features distinguish anti-SLAPP from any other California motion practice — and shape the strategic calculus of both filing and defending.

Automatic discovery stay

Under §425.16(g), all discovery in the case is stayed when an anti-SLAPP motion is filed. The plaintiff cannot conduct depositions, propound interrogatories, or seek documents while the motion is pending. The court may, on noticed motion and for good cause, permit specified discovery relevant to the motion itself — but not general merits discovery.

The practical consequence: filing the motion freezes the case. For defendants whose strategy depends on slowing down expensive discovery, even a denied anti-SLAPP motion produces months of delay. This creates a temptation to file motions that don't have merit purely for the strategic delay. The fee-shift in §425.16(c)(1) — mandatory fees to the plaintiff if the motion is found frivolous or solely intended to cause delay — is the statutory check on that practice, though courts apply it sparingly.

Immediate appealability

An order granting or denying an anti-SLAPP motion is immediately appealable under §425.16(i) and §904.1(a)(13). This is unusual — California's general rule allows appeal only from final judgments or specified intermediate orders. Anti-SLAPP rulings have their own appeal route.

The strategic consequence cuts both ways. A defendant who loses the motion can take an immediate appeal and continue to delay the case while the appeal is pending. A plaintiff who loses the motion (i.e., the motion is granted and their claim is struck) takes the same appellate route. Either appeal typically adds 12–24 months to the case timeline.

Defense counsel should price the anti-SLAPP motion into their fee estimate with the appeal in mind. A motion that costs $20,000–$40,000 to brief at the trial-court level often costs another $30,000–$60,000 on appeal. The fee-shift recovers those costs only if the defendant ultimately prevails through the appeal — which, for close cases, is genuinely uncertain.

Mandatory attorney fees to the prevailing defendant

Under §425.16(c)(1), a prevailing defendant on an anti-SLAPP motion shall be entitled to recover their attorney fees and costs. The fee award is mandatory; the court has discretion only as to the reasonableness of the amount. For defendants in cases that genuinely fit the anti-SLAPP framework, this is the doctrine's most powerful feature — the cost of bringing the motion is recovered from the plaintiff, often producing a net financial benefit even before factoring in the case being dismissed.

The same provision creates the symmetric risk: a plaintiff can recover fees against a defendant whose anti-SLAPP motion is “frivolous or is solely intended to cause unnecessary delay.” Courts have applied this fee-shift sparingly, but appellate cases like Decker v. U.D. Registry, Inc. (2003) 105 Cal. App. 4th 1382 establish that the standard is real and enforceable. Defense counsel filing a borderline motion should consider not just the likelihood of winning but the likelihood of being found frivolous if they lose.

The 60-day window — and why it matters

An anti-SLAPP motion must be filed within 60 days of service of the complaint, or later if the court permits (§425.16(f)). The 60-day window is not the same as the 30-day window to file an answer. A defendant can file an answer first and then file the anti-SLAPP motion within the 60-day window — but a defendant who lets both deadlines slip loses the procedural advantage.

The “later if the court permits” provision is sometimes invoked, but trial courts are not generous with extensions absent strong cause. Late motions face additional scrutiny on the merits and create an inference that the motion is a delay tactic rather than a genuine attempt to dispose of the case early.

For defendants weighing whether to file an anti-SLAPP motion, the 60-day window means the decision is functionally simultaneous with the initial-response decision. Counsel cannot wait to see how the case develops; the analysis has to happen at the same time as the answer / demurrer / cross-complaint analysis. This is one reason the firm's Just Got Served playbook treats the anti-SLAPP analysis as a Phase 1 item rather than a downstream consideration.

When the anti-SLAPP defense actually fits

Cases where the anti-SLAPP motion is genuinely the right move share several characteristics:

• The cause of action directly targets protected conduct. Defamation suits where the alleged defamation is the entire claim. Intentional-interference claims based on petitioning activity. Malicious prosecution claims (which the Supreme Court treats as paradigmatic SLAPPs).
• The plaintiff cannot easily produce admissible evidence of the elements. The motion is most effective when the plaintiff's case has structural weakness — missing element, applicable privilege, statute of limitations problem — that the plaintiff cannot fix with declarations.
• The defendant has resources to absorb a long appellate fight if necessary. The motion's value compounds with appellate finality, but the appellate fight adds cost and time before the fee award materializes.
• The discovery freeze itself has strategic value. Even a denied motion produces months of delay. For defendants in cases where time favors the defense, the freeze can be worth the filing cost.

Cases where the motion is the wrong move typically have the opposite features: the cause of action arises from non-speech conduct that happens to involve speech; the plaintiff has clear admissible evidence; the defendant cannot fund a multi-year appellate fight; the discovery freeze offers little strategic value.

Counter-SLAPP and the SLAPPback statute (§425.18)

California has a separate statutory provision, §425.18, that addresses what happens when an unsuccessful SLAPP plaintiff later files a malicious-prosecution suit against the original defendant. The original SLAPP defendant (now plaintiff in the malicious-prosecution case) has procedural protections under §425.18 — including limits on the original SLAPP plaintiff's ability to file their own anti-SLAPP motion against the malicious-prosecution suit.

The §425.18 framework matters in two practical contexts:

• Plaintiffs considering a malicious-prosecution suit after defeating a SLAPP need to understand that the procedural advantages favor them, not the prior SLAPP plaintiff.
• Defendants who lost an anti-SLAPP motion and faced a subsequent malicious-prosecution suit cannot rely on a second anti-SLAPP motion to dispose of the new case.

This is the doctrinal symmetry the legislature built to discourage repeated abuse of the procedural-protection system. It is invoked far less often than the underlying §425.16, but practitioners advising on SLAPP strategy should be aware of it.

Recent California Supreme Court guidance

Three recent California Supreme Court decisions have refined the §425.16 framework:

• Park v. Board of Trustees (2017) 2 Cal. 5th 1057 — clarified the “arising from” requirement; cause of action must be based on protected activity, not merely related to it.
• Wilson v. Cable News Network, Inc. (2019) 7 Cal. 5th 871 — reaffirmed Park's standard for mixed-content claims; the elements of the cause of action drive the analysis.
• Bonni v. St. Joseph Health System (2021) 11 Cal. 5th 995 — applied the analysis to medical peer review proceedings, finding that some claims arose from protected activity and others did not, requiring claim-by-claim assessment within a single complaint.

The pattern across these cases is consistent: California courts have tightened the step-one inquiry while preserving the doctrine's vitality for cases that genuinely fit. The era of broad “protected activity adjacent to the case” anti-SLAPP filings is over. Defense counsel evaluating a potential motion need to identify, with precision, which specific elements of which specific causes of action depend on which specific protected acts.

Practical filing decision framework

For a defense team in the first weeks of a new California civil case, the anti-SLAPP analysis should run on the following framework:

Day 1–7: Identify potential protected activity

Read the complaint with §425.16(e)(1)–(4) in mind. Is the alleged conduct underlying any cause of action: a court filing or judicial communication? A statement to a regulatory body? A public-forum communication on a public-interest topic? Petitioning activity? If yes, anti-SLAPP is a candidate.

Day 7–21: Run the Park analysis

For each cause of action that involves protected activity, ask: do the elements of the cause of action require proof of the protected activity itself, or could the cause of action be proven without reference to it? If the cause of action can be proven without the protected activity, anti-SLAPP fails at step one. If the cause of action depends on the protected activity for its existence, the motion is viable.

Day 21–45: Assess the step-two case

If step one is satisfied, evaluate whether the plaintiff can produce admissible evidence of each element. The motion is most effective when the plaintiff faces structural barriers — privilege, statute of limitations, lack of evidence of a required element. The motion is less effective when the plaintiff has straightforward evidence of every element and the defense rests on credibility or factual dispute.

Day 45–60: Decide and file

Three questions decide it: (1) Is the motion likely to be granted on the merits? (2) If denied, will the immediate appeal produce strategic value that justifies the cost? (3) Is the fee-shift risk acceptable given the defendant's resources and the case posture? If all three answers are favorable, file by Day 60. If any answer is unfavorable, the motion is probably not the right tool for this case.

The doctrine's enduring shape

Anti-SLAPP under §425.16 has survived three decades of legislative tinkering and appellate refinement because the underlying problem it addresses — meritless retaliation lawsuits targeting protected speech and petitioning — is real and recurring. The doctrine's mechanics are extreme by California civil-procedure standards (immediate disposition, automatic discovery freeze, immediate appeal, mandatory fee shift) because the legislature judged the underlying harm to warrant exceptional procedural protection.

The doctrine's current state is one of refined application. The era of casual anti-SLAPP filings against any case that mentions speech or petitioning is past. The era of effective anti-SLAPP filings in cases that genuinely fit the framework continues. The difference is practitioner discipline at the front end — running the Park analysis carefully, assessing the step-two case honestly, and only filing when the motion both fits the doctrine and serves the defense strategy.

For California civil defense practice, that discipline is the gap between using the doctrine as a tool and using it as a reflex. The cases where the motion fits are won at the front end. The cases where it doesn't fit are lost there too.