California SB 37 Attorney Advertising Law: Private Suits With $5,000 to $100,000 Per Violation

California SB 37 attorney advertising rules let any person sue attorneys, law firms, cappers and uncertified referral operations over unlawful solicitation, with statutory damages of $5,000 to $100,000 per violation or three times actual damages, whichever is larger, and they have been in force since January 1, 2026. Reporting published on September 25, 2026 says the law is now expected to generate private litigation against plaintiffs' firms and to give defense counsel a new line of attack on the adequacy of class counsel, which makes SB 37 a litigation-risk statute rather than just a marketing-compliance rule.

The bill, authored by Senator Tom Umberg (D-Santa Ana) and backed by the Consumer Attorneys of California, was approved by Governor Gavin Newsom and filed with the Secretary of State on October 11, 2025. It amends Sections 6153, 6155, 6157, 6157.2, 6158.4, 6158.5 and 6158.7 of the Business and Professions Code and adds a new Section 6156.5. Most of the commentary so far has come from legal marketing agencies and has treated the statute as a checklist for ad copy. The more consequential question for the personal injury bar is who will actually sue under it, through which door, and what a plaintiffs' firm's intake and advertising history now means in a courtroom.

What is the California SB 37 attorney advertising law?

SB 37 is a 2025 California statute that rewrites the state's rules on attorney advertising and client solicitation and, for the first time, hands enforcement to private plaintiffs with a statutory damages remedy. It does three things.

First, it tightens what a legal advertisement may say and must disclose. Second, it reinforces the long-standing ban on runners and cappers (people paid to steer injured people to a particular lawyer) and on referral businesses that are not certified by the State Bar of California. Third, it creates private enforcement: a direct civil action for unlawful referral operations under new Section 6156.5, and a State Bar-gated civil action for advertising-content violations under Section 6158.4.

The Senate Judiciary Committee's analysis framed the bill as empowering "harmed consumers" by "authorizing citizen enforcement against unlawful attorney advertising, capping, and illegal referral services." The bill cleared the Senate without opposition.

The table below maps the California SB 37 attorney advertising changes, showing each amended or added section to its practical effect.

Business and Professions Code section	Subject	What SB 37 does	Who is exposed
6153	Runners and cappers	Carries forward the criminal prohibition on acting as a runner or capper, including solicitation at jails, prisons, hospitals and in public places	Cappers, investigators, marketers, and the attorneys who use them
6155	Lawyer referral services	Bars any nongovernmental entity from operating to refer potential clients to attorneys unless certified by the State Bar and run to State Bar minimum standards approved by the California Supreme Court	Lead generators, aggregators, "free case review" sites without a named lawyer
6156.5 (new)	Private right of action	Any person may sue for a violation of Section 6155; statutory damages of $5,000 to $100,000 per violation or three times actual damages, whichever is larger	Uncertified referral operators and those who participate with them
6157	Definitions	Broadens what counts as an "advertisement" to reach digital channels, including websites, landing pages, social media and email	All advertisers
6157.2	Prohibited content	Bars guarantees of outcome, claims of "immediate cash or quick settlements," undisclosed dramatizations and impersonations, and misleading claims about skills, experience or record	Attorneys, firms, joint advertisers
6158.4	Complaint procedure	State Bar has 21 days to determine whether substantial evidence of a violation exists; if the advertiser does not withdraw within 72 hours or rebroadcasts, a civil suit may follow	Advertisers that ignore a State Bar finding
6158.5, 6158.7	Related advertising-enforcement provisions	Amended alongside Section 6158.4 as part of the same enforcement package	All advertisers

When did SB 37 take effect?

SB 37 took effect on January 1, 2026. The governor signed it on October 11, 2025, and, as a non-urgency statute, it became operative at the start of the following year under California's default rule. At least one agency blog has described the law as effective on the signing date; that reading is inconsistent with the chaptered bill's status and with the majority of practitioner commentary, and firms should treat January 1, 2026 as the operative date for conduct.

The date matters because private claims under the California SB 37 attorney advertising provisions attach to conduct. Any ad, landing page, referral arrangement or lead purchase that ran after January 1, 2026 is measured against the new text. California's general statute of limitations for statutory penalty claims and the specific limitations provisions that may apply to Section 6156.5 have not yet been tested in a published decision, so the length of the look-back window is an open question that plaintiffs and defendants will litigate.

What must a California attorney advertisement include?

Every California legal ad must name at least one responsible party and one real place. According to the chaptered text as summarized by the Senate Judiciary Committee and the Daily Journal, an advertisement must conspicuously identify:

• the name of at least one lawyer licensed to practice law in California, or the law firm, certified lawyer referral service or joint advertiser responsible for the content; and
• the city, town or county of at least one bona fide office location, or the address of record the lawyer or firm maintains with the State Bar.

The content rules in Section 6157.2 then prohibit several practices common in high-volume personal injury and mass tort advertising:

• Guarantees. No guarantee or warranty of success regarding the outcome of a legal matter.
• Fast money claims. No statement or symbol stating that the featured lawyer can generally obtain immediate cash or quick settlements.
• Dramatizations. Impersonations of clients and dramatizations of events must be disclosed as such; actors cannot be presented as real clients giving testimonials.
• Spokespeople. A spokesperson, including a celebrity, must be identified as a spokesperson.
• Record claims. No misleading, deceptive or false statements, words or phrases about a lawyer's or firm's skills, experience or record.
• Paid awards. No reference to recognition or awards from an organization unless the award is not conferred merely by virtue of membership and the organization does not charge or solicit a fee for it.

The last two items connect directly to the September 2026 reporting. Legal observers quoted by The Center Square said the law will bring "increased scrutiny" of how trial attorneys describe their past verdicts, including damages awards that were never collected. A billboard that touts a $50 million verdict later reduced on remittitur, reversed on appeal or settled for a fraction of the award is the kind of record claim a plaintiff can now test.

Can you sue a lawyer in California for a misleading ad?

Yes. Under SB 37 a consumer can sue a California lawyer or law firm over a misleading ad, but the path depends on the type of violation, and the two routes are easy to confuse.

Route one: direct civil action under Section 6156.5. For violations of Section 6155, the referral-service certification rule, the statute says any person may bring a civil action. There is no State Bar gate. The claim goes straight to superior court, with statutory damages of $5,000 to $100,000 per violation or three times actual damages, whichever is larger. The Senate Judiciary analysis describes this as a private right of action to enforce "the existing prohibition on capping." Coverage of the law in September 2026 listed attorneys, law firms, cappers and referral services among the parties who can be sued.

Route two: the State Bar gate under Section 6158.4. For violations of the advertising-content rules, a complainant files with the State Bar first. The State Bar then has 21 days to decide whether substantial evidence of a violation exists. If it finds substantial evidence and the advertiser does not withdraw the advertisement within 72 hours, or withdraws it and later rebroadcasts it, the complainant may sue for statutory damages of $5,000 to $100,000 per violation, plus attorney's fees and injunctive relief.

The practical difference is large. A firm that fixes an ad within 72 hours of a State Bar finding can close off route two for that ad. Route one has no cure period: an arrangement with an uncertified referral operation that generated signed cases is exposed on the face of the statute.

How much can you recover under SB 37?

A plaintiff can recover $5,000 to $100,000 per violation, or treble actual damages if that figure is larger, plus fees and injunctive relief on the advertising route. The per-violation structure is what drives exposure in mass tort and high-volume auto intake, where a single campaign can generate thousands of contacts.

Remedy element	Section 6156.5 (referral and capping route)	Section 6158.4 (advertising-content route)
Who may sue	Any person	A complainant after a State Bar substantial-evidence finding
Precondition	None stated	State Bar finding within 21 days; ad not withdrawn within 72 hours, or rebroadcast
Statutory damages	$5,000 minimum, $100,000 maximum per violation	$5,000 to $100,000 per violation
Alternative measure	Three times actual damages, whichever is larger	Reported as treble actual damages in the alternative
Fees and equitable relief	Per statute and general fee-shifting law	Attorney's fees and injunctive relief
Cure opportunity	None stated	Withdrawal within 72 hours

How "per violation" is counted is not settled. Henson Legal, a firm that advises lead generators, has offered a hypothetical in which a single noncompliant social media post generating 50 leads could produce up to $5 million in liability for both the affiliate and the attorney. That is a ceiling calculation, not a prediction, and no published California decision has yet addressed whether each lead, each impression, each ad or each referral is a separate violation. The answer will decide whether SB 37 claims are nuisance-value or bet-the-firm.

Criminal exposure sits on top. Section 6153 continues to make acting as a runner or capper a crime: on a first conviction, up to one year in county jail, a fine of up to $15,000, or both, with longer terms of up to four years available on a second or subsequent conviction.

Does SB 37 apply to lead generators and marketing agencies?

Yes, and this is where the statute bites hardest. The expanded definition of "advertisement" reaches websites, landing pages, lead generation platforms and digital marketing content intended to encourage someone to contact a lawyer. A "free case evaluation" funnel that does not name a responsible California lawyer and a real office location is noncompliant on its face.

Henson Legal reads the statute to mean that a lead generator that wants to run legal-services advertising without naming a specific attorney or firm must become a certified lawyer referral service under Section 6155, with the State Bar's minimum standards that come with certification, including minimum panel sizes, referral record-keeping, State Bar audits and malpractice insurance for panel members. Operating as an uncertified referral business is the Section 6155 violation that route one targets.

For firms, the vendor problem is direct. Commentators across the SERP agree that attorneys can no longer distance themselves from agencies that write their ads or sell them leads. The statute makes the responsible attorney a required disclosure on the ad, which means the named attorney owns what the agency publishes. Several commentators describe the resulting exposure as effectively strict; whether courts will read a knowledge or participation element into claims against the purchasing firm has not been decided.

The line practitioners need to hold is between paying for marketing services and paying for the procurement of business. A flat fee for advertising, or a fixed cost per lead that does not vary with case outcome, is a marketing expense. A payment that rises with signed retainers, settlement value or the fee the firm earns starts to look like payment for referrals, which is the conduct Sections 6153 and 6155 prohibit.

Can SB 37 violations be used to challenge class counsel?

Possibly, and that is the newest part of the story. The September 25, 2026 reporting said the law "could allow opposing counsel to challenge trial lawyers' ethics and qualifications" in class actions based on misconduct in marketing.

The mechanism is familiar. In federal court, Rule 23(g) requires the court to appoint class counsel who will fairly and adequately represent the class, and Rule 23(a)(4) requires adequacy of representation. California's class action procedure applies similar adequacy standards. Defendants already probe proposed class counsel for conflicts, prior sanctions and solicitation irregularities. A statutory finding, State Bar substantial-evidence determination, or pending civil suit over deceptive advertising or capping gives a defendant a concrete, documented basis to argue that counsel is inadequate or that the named plaintiff was improperly solicited.

The risk extends beyond Class Action practice. In a Mass Tort or Multidistrict Litigation (MDL), leadership appointments turn on the court's confidence in counsel's judgment. Intake practices have already been a flashpoint in MDLs where defendants challenged the volume and quality of filed claims. An SB 37 finding against a firm's California advertising is the kind of record a defendant can place before an MDL transferee judge considering a leadership slate or a motion attacking claim vetting.

None of this has yet been tested. No published ruling has disqualified class counsel on the basis of an SB 37 violation, and courts have historically been reluctant to let adequacy fights turn into collateral ethics trials. The exposure is real but, for now, prospective.

Who backed SB 37, and why is it in the news now?

The Consumer Attorneys of California supported the bill, which surprised some observers because the private right of action can be aimed at plaintiffs' firms. The trial bar's stated rationale was that ethical firms are disadvantaged by out-of-state lead generators and cappers who make unrealistic promises, and that a private enforcement mechanism deters conduct the State Bar has struggled to police.

The renewed attention is a product of timing. Nine months into the statute's life, marketing-compliance vendors describe what one called a "mass exodus" of lead generation companies and affiliate networks from the California market, and the Legislature has since added two more statutes aimed at the business side of the plaintiffs' bar. The September 25 coverage shifted the conversation from ad copy to litigation exposure.

SB 37 in the 2025-2026 California package

SB 37 is one of three California laws in roughly a year that regulate how plaintiffs' firms acquire and finance cases.

Statute	Signed	Operative	Core rule	Private remedy
SB 37 (Umberg)	October 11, 2025	January 1, 2026	Attorney advertising content and disclosures; ban on uncertified referral services and capping	$5,000 to $100,000 per violation or treble damages
SB 623 (Uber and CAOC compromise)	June 25, 2026	Accidents on or after January 1, 2027	Limits recoverable past medical expenses in rideshare crash cases tied to lien-based treatment; bars referral compensation linked to lien-based care; prohibits sale of medical liens	Statutory prohibitions; State Bar discipline
AB 2305 (Kalra)	September 2026	Contracts on or after January 1, 2027	Corporate legal funder control over litigation decisions is the unauthorized practice of law	$10,000 per violation or treble damages

Read together, the three statutes close a loop. SB 37 governs how a case comes in the door, SB 623 governs the Medical Lien and provider-referral relationships that often travel with auto cases, and AB 2305 governs who may control the case once Third-Party Litigation Funding is in place. Each includes a private or State Bar remedy, and each shifts compliance cost onto the firms that run high-volume intake. SB 623 emerged from a negotiated settlement between Uber and the Consumer Attorneys of California that pulled competing ballot measures, including an Uber-backed proposal to cap the Contingency Fee in auto cases at 25 percent, off the November 2026 ballot.

California SB 37 attorney advertising: what it means for plaintiffs' firms and the PI bar

Personal injury firms advertising in California. Every ad, landing page and social post needs a named responsible California attorney and a real office location. Verdict and settlement claims should be accurate as to what was collected, not just what the jury awarded. Award badges from pay-to-play organizations should come down.

Mass tort intake operations. National campaigns that route California respondents through aggregators should confirm that the aggregator is either a certified lawyer referral service or runs ads that name the responsible firm. Per-signed-case pricing is the structure most likely to be characterized as payment for referrals. Firms should also expect intake records, vendor contracts and ad archives to be requested in discovery by defendants looking for adequacy and claimant solicitation arguments.

Firms seeking class counsel or MDL leadership appointments. An open SB 37 complaint or State Bar finding is now disclosable risk. Firms should know their exposure before an application is filed, not after a defendant raises it.

Defense counsel. SB 37 supplies a statutory vocabulary for challenges that previously relied on general ethics rules. Discovery into how named plaintiffs were recruited, and whether marketing crossed Section 6157.2 lines, is a legitimate adequacy inquiry, though courts will police its scope.

Lead generators and agencies. The choice is binary: certify as a lawyer referral service under State Bar standards, or run ads that name a responsible firm and accept that the firm will demand contractual compliance controls and indemnities.

Funders. Where portfolio firms depend on purchased leads, SB 37 exposure is a diligence item alongside AB 2305's control restrictions.

FAQ

What is California SB 37?

SB 37 is a California statute, signed October 11, 2025 and operative January 1, 2026, that rewrites attorney advertising and solicitation rules in the Business and Professions Code and lets private plaintiffs sue for violations, with statutory damages of $5,000 to $100,000 per violation.

Who can be sued under SB 37?

Attorneys, law firms, cappers, uncertified referral services and others who violate the solicitation and referral rules can be sued; reporting in September 2026 identified all four categories as potential defendants.

Does a consumer have to go to the State Bar first?

Only for advertising-content claims under Section 6158.4, where the State Bar has 21 days to find substantial evidence and the advertiser has 72 hours to withdraw the ad. Claims under new Section 6156.5 for uncertified referral operations go directly to court.

Can lawyers still advertise past verdicts in California?

Yes, but the ad must not be misleading about the lawyer's record, and observers expect scrutiny of verdict claims where the award was reduced, reversed or never collected.

Does SB 37 apply to out-of-state firms and lead generators?

It applies to advertising and referral activity directed at California consumers, and marketing-industry commentators report that lead generators and affiliate networks have either certified, restructured or left the California market in response.

Has any court ruled on SB 37 yet?

No published California appellate decision interpreting the private right of action in the California SB 37 attorney advertising scheme had been reported as of September 28, 2026, so the counting of violations, the limitations period and the knowledge standard for purchasing firms all remain open.