Semien et al v. PubMatic Inc.
Summary
This January 27, 2026 district-court order in Semien v. PubMatic denied defendant’s motion to dismiss most claims at the pleading stage, allowing plaintiffs' intrusion-on-seclusion, CIPA § 631, CIPA § 638.51, and ECPA § 2511 claims to proceed, while dismissing the unjust enrichment claim with leave to amend. The court also exercised limited judicial notice—denying notice of the Mindbloom privacy policy and sign-up page but granting notice of legislative materials concerning SB 690 and AB 929.
Litigation Status
Procedural Posture
Defendant PubMatic moved to dismiss plaintiffs' First Amended Complaint (filed after an initial complaint). The district court issued an order on January 27, 2026 granting in part and denying in part the motion to dismiss; plaintiffs were given leave to amend their unjust enrichment claim by February 5, 2026.
Reported Holding
The court granted in part and denied in part PubMatic’s motion to dismiss. The court denied dismissal of plaintiffs’ intrusion upon seclusion (California common law) claim, plaintiffs’ claims under California Penal Code § 631 and 18 U.S.C. § 2511 (ECPA), and plaintiffs’ claim under CIPA § 638.51, finding the complaint plausibly alleged violations at the pleading stage. The court granted dismissal of the unjust enrichment claim (Count IV) with leave to amend.
What the Court Decided
The court found plaintiffs sufficiently pleaded intrusion upon seclusion, CIPA § 631 and ECPA § 2511 claims and therefore denied PubMatic’s motion to dismiss as to those claims; it found the unjust enrichment claim deficient and granted dismissal of that claim with leave to amend. The court also granted in part and denied in part PubMatic’s request for judicial notice (denying notice as to Exhibits A and B — Mindbloom Privacy Policy and Sign-Up Page — and granting notice as to Exhibits C-F concerning legislative materials).
What the Court Did Not Decide
The court did not resolve the merits of the claims on summary judgment or at trial, did not decide whether Mindbloom obtained valid consent, and did not reach damages or class certification issues; it also did not issue a final disposition of the case.
Significance
Generally viewed as plaintiff-favorable. Characterizations of significance describe how the matter has generally been discussed in tracked public sources; individual holdings are often narrow, procedural, or fact-specific, and this page does not state or imply broader holdings than the sources support.
What This Page Does and Does Not Say
This page reports what our tracked public sources say about this matter — including, where identified, the procedural posture (for example, a ruling on a motion to dismiss is not a final merits decision). It does not report legal conclusions beyond those sources, does not predict outcomes, and does not constitute legal advice.
Technologies at Issue
- pixel tracking (PubMatic pixel)
- real-time bidding (RTB)
- identity resolution / Identity Hub
- pixel tracking
- identity hub / identity resolution
- partner pixels / third-party tracking
- web adtech pixels
Third parties named or identified in tracked sources: PubMatic Inc., Mindbloom, Peacock, Zillow, Bon Appetit, Mindbloom (referenced), Publisher clients (examples in complaint: Peacock, Zillow, Bon Appetit).
Statutes Invoked
- Cal. Penal Code §§ 631(a), 638.51(a); 18 U.S.C. § 2511
- Cal. Penal Code §§ 631(a), 638.51(a); 18 U.S.C. § 2511; Cal. Civ. Code § 1798.99.80(c)
Claims Asserted
- Intrusion upon seclusion (California common law)
- California Penal Code § 631(a) (CIPA § 631)
- California Penal Code § 638.51(a) (CIPA § 638.51)
- Electronic Communications Privacy Act (ECPA), 18 U.S.C. § 2511
- Unjust enrichment
- California Penal Code § 631(a)
- California Penal Code § 638.51(a) (pen register claim)
- Electronic Communications Privacy Act (18 U.S.C. § 2511)
What This Matter May Mean for Website Operators
For operators using similar technologies, the recurring factual questions in matters like this one are whether advertising pixels transmit page URLs or hashed form data before a consent choice. Our scanner tests these behaviors empirically.
Because this matter is pending, anything reported here is procedural — allegations and interim rulings, not final determinations.
Detection of a similar technology on a website is an informational risk indicator, not a legal conclusion, and nothing in this section is legal advice.
Related Intelligence
Sources
- Semien et al v. PubMatic Inc., No. 3:2025cv03164 - Document 47 (N.D. Cal. 2026)
- Semien et al v. PubMatic Inc., No. 3:2025cv03164 - Document 47 (N.D. Cal. 2026)
About This Page
Publisher: Inspection-Ready Institute, Inc. (DBA Crandall Consulting), an independent website compliance and risk consultancy. We are not a law firm and nothing on this page is legal advice.
How this content is produced: Facts are extracted from publicly available sources — court and government materials, recognized legal press, professional analysis, and industry reports — by our litigation intelligence engine, stored with full source provenance, and rendered from the database. Risk guidelines are computed by a deterministic formula, never by an AI model directly. See the full methodology.
Limitations: Counts labeled "Tracked" reflect matters identified in our source set and are not official court statistics. We report what courts decided and did not decide; we do not predict outcomes.
Corrections: If you believe anything on this page is inaccurate, contact us via the contact page and we will review the underlying sources promptly.
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