Stop Conversion & Interference: California Business Torts
California law protects businesses from wrongful control of property (conversion) and disruptive meddling with contracts or customer relationships (interference). Learn what these torts cover, how to spot them, potential remedies, and practical steps to protect your company.
What Is Conversion in California?
Conversion is a civil wrong that occurs when someone intentionally exercises control over your property in a way that is inconsistent with your rights. In a business context, this often involves company funds, inventory, equipment, or negotiable instruments. To prevail, a plaintiff generally must show: (1) ownership or right to possess the property, (2) wrongful disposition or control by the defendant, and (3) resulting damages. Substantial interference with the owner’s rights, even if temporary, can qualify. When the defendant initially obtained possession lawfully, a demand for return and refusal is often required to establish conversion. See CACI No. 2100 (Conversion).
Examples of Conversion for Businesses
- An ex-employee transfers client payments into a personal account.
- A vendor withholds your specialized tooling after contract termination.
- A departing partner removes proprietary prototypes from the lab.
- A contractor refuses to return data storage devices containing customer records.
Intentional Interference with Contract
California recognizes liability when a third party knowingly and intentionally disrupts a valid, existing contract and causes harm. Core elements include: (1) a valid contract between the plaintiff and a third party, (2) the defendant’s knowledge of that contract, (3) intentional acts designed to induce a breach or disrupt performance, (4) actual breach or disruption, and (5) resulting damages. See CACI No. 2200; see also Quelimane Co. v. Stewart Title Guaranty Co., 19 Cal.4th 26 (1998). Competition does not excuse using unlawful means, and there is generally no competitor’s privilege to interfere with an existing, binding contract.
Intentional Interference with Prospective Economic Advantage
This claim protects future or expected business relationships even when no binding contract exists. A plaintiff must show: (1) an existing economic relationship with probable future economic benefit, (2) the defendant’s knowledge of that relationship, (3) intentional conduct designed to disrupt the relationship, (4) actual disruption, and (5) economic harm. In California, the defendant’s conduct must be independently wrongful—i.e., unlawful for a reason beyond the interference itself (for example, fraud or statutory violations). See CACI No. 2202; Della Penna v. Toyota Motor Sales, U.S.A., Inc., 11 Cal.4th 376 (1995); Korea Supply Co. v. Lockheed Martin Corp., 29 Cal.4th 1134 (2003).
Common Defenses
- Consent or authorization to possess or use the property (conversion).
- Good-faith claim of right or ownership (conversion), though it may not bar liability if the dominion was wrongful.
- No knowledge of the contract or relationship (interference).
- No actual breach/disruption or no damages.
- Competition/privilege: For prospective economic advantage, competition may be privileged if no independently wrongful means are used; it generally does not excuse interference with a binding contract. See Della Penna.
Remedies and Damages
Courts may award compensatory damages for the value of property converted, lost profits from disrupted contracts or relationships, and consequential losses. In appropriate cases, punitive damages may be available upon clear and convincing proof of oppression, fraud, or malice. See Cal. Civ. Code § 3294. Equitable relief—such as claim and delivery (a replevin-type remedy), constructive trusts, or injunctive orders—can help stop ongoing harm and secure the return of business assets.
Evidence That Strengthens Your Case
- Clear proof of ownership or right to possession (purchase records, IP assignments, chain of custody).
- Contract documents, amendments, and communications showing the other party’s knowledge.
- For prospective advantage claims, metrics showing the likelihood of future business (historical renewals, pipeline data, signed LOIs).
- For conversion, traceable asset identifiers (serial numbers, logs, access records) and demand/return correspondence.
- For interference, evidence of independently wrongful acts (for example, misappropriation or false statements).
Practical Steps If You Suspect Conversion or Interference
- Preserve evidence immediately: contracts, emails, messages, access logs, device inventories, and financial records.
- Send a tailored demand letter; consider a litigation hold for relevant custodians.
- Evaluate urgent relief: a temporary restraining order or preliminary injunction can prevent further harm and secure property.
- Coordinate with IT to revoke access, disable tokens, and document downloads or transfers.
- Consider parallel claims (for example, trade secret misappropriation, unfair competition) where facts support them.
Practical Tips
- Move fast on injunctive relief to preserve status quo and prevent asset dissipation.
- Centralize evidence collection with a single point of contact to avoid spoliation.
- Quantify damages early with clean accounting tie-outs and contemporaneous logs.
- For conversion, send a clear written demand with a firm deadline and delivery instructions.
Quick Checklist
- Identify the property/relationship at issue and your rights.
- Secure systems: revoke access, rotate credentials, image devices as needed.
- Collect and preserve communications and logs.
- Prepare and send a demand or cease-and-desist letter.
- Assess TRO/preliminary injunction viability.
- Document damages: invoices, P&L impact, lost deals, valuations.
- Consult counsel to align tort, contract, and statutory strategies.
Working With Counsel
An early case assessment can clarify claims, defenses, and options for immediate relief. Counsel can help evaluate the strength of conversion and interference theories, quantify damages, and pursue prompt court orders to stop ongoing misconduct. Tailored strategies often combine tort claims with contract, statutory, and IP remedies to maximize leverage and recovery.
Contact our team to discuss your situation.
FAQ
Do I need to prove intent to steal for conversion?
No. You must show intentional control over your property that is inconsistent with your rights, plus damages. A good-faith mistake usually does not excuse wrongful dominion.
Can aggressive competition defeat an interference claim?
For prospective economic advantage, lawful competition without independently wrongful acts may be privileged. It generally does not excuse interference with an existing, binding contract.
What if the defendant initially had permission to hold the property?
If possession began lawfully, a demand for return and refusal often helps establish conversion.
Are punitive damages available?
Potentially, upon clear and convincing proof of oppression, fraud, or malice under Cal. Civ. Code § 3294.
How quickly should I act?
Immediately. Preserve evidence and consider injunctive relief to prevent further harm.
Citations
- Judicial Council of California Civil Jury Instructions (CACI) 2024 Edition (see CACI Nos. 2100, 2200–2202).
- Cal. Civ. Code § 3294 (punitive damages).
- Quelimane Co. v. Stewart Title Guaranty Co., 19 Cal.4th 26 (1998).
- Korea Supply Co. v. Lockheed Martin Corp., 29 Cal.4th 1134 (2003).
- Della Penna v. Toyota Motor Sales, U.S.A., Inc., 11 Cal.4th 376 (1995).
California-specific notice: This blog is for general informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship. Laws change and outcomes depend on specific facts; consult a qualified California attorney about your situation.