Sorrento Therapeutics, Inc. v. Anthony Mack

CourtCourt of Chancery of Delaware
DecidedJuly 31, 2025
DocketC.A. 2021-0210-PAF
StatusPublished

This text of Sorrento Therapeutics, Inc. v. Anthony Mack (Sorrento Therapeutics, Inc. v. Anthony Mack) is published on Counsel Stack Legal Research, covering Court of Chancery of Delaware primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Sorrento Therapeutics, Inc. v. Anthony Mack, (Del. Ct. App. 2025).

Opinion

IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE

SORRENTO THERAPEUTICS, INC., a ) Delaware corporation, and SCILEX ) PHARMACEUTICALS INC., a Delaware ) corporation, ) ) Plaintiffs, ) ) v. ) C.A. No. 2021-0210-PAF ) ANTHONY MACK, an individual, and ) VIRPAX PHARMACEUTICALS, INC., a ) Delaware corporation, ) ) Defendants. )

MEMORANDUM OPINION

Date Submitted: November 15, 2024 Date Decided: July 31, 2025

Kevin M. Coen, Alexandra M. Cumings, MORRIS, NICHOLS, ARSHT & TUNNELL LLP, Wilmington, Delaware; Jamie L. Wine, Steven N. Feldman, LATHAM & WATKINS LLP, New York, New York; Matthew W. Walch, Russell Mangas, LATHAM & WATKINS LLP, Chicago, Illinois; Attorneys for Plaintiffs Sorrento Therapeutics, Inc. and Scilex Pharmaceuticals Inc.

Elizabeth A. Sloan, Brittany M. Giusini, BALLARD SPAHR LLP, Wilmington, Delaware; Paul Lantieri, III, BALLARD SPAHR LLP, Philadelphia, Pennsylvania; Attorneys for Defendant Virpax Pharmaceuticals, Inc.

Stephen B. Brauerman, Justin C. Barrett, BAYARD, P.A., Wilmington, Delaware; Attorneys for Defendant Anthony Mack.

FIORAVANTI, Vice Chancellor This opinion determines the appropriate remedies resulting from a corporate

officer’s breaches of fiduciary duty, violation of a restrictive covenants agreement,

and misappropriation of trade secrets. In its post-trial opinion adjudicating liability,

the court found that the officer’s corporate co-defendant aided and abetted his

breaches of fiduciary duty, tortiously interfered with the restrictive covenants

agreement, and misappropriated the plaintiffs’ trade secrets. At the time of trial and

in post-trial briefing, the plaintiffs sought a variety of potential remedies against the

defendants, including injunctive relief, damages, the imposition of a constructive

trust, and a royalty payment based on the profits derived from the co-defendant’s

products in the event they ultimately became marketable. The court’s post-trial

opinion requested additional briefing on the appropriate remedy in light of the

specific claims for which the defendants were held liable.

In the interim, the plaintiffs reached a settlement with the officer’s corporate

co-defendant. The settlement created a host of new issues. For example, the officer

now claims a right to contribution against his co-defendant, which he neither pleaded

nor sought before the settlement. The plaintiffs, now left only with the individual

defendant, have reformulated their preferred remedies. This opinion sorts through

the morass and concludes that the appropriate remedy involves a mix of injunctive

and monetary relief against the remaining defendant. The court also concludes that

the officer’s conduct warrants partial fee-shifting in favor of the plaintiffs. I. BACKGROUND

The background of this action is described in the court’s post-trial opinion on

liability (the “Liability Opinion”).1 This opinion recites only the facts necessary to

determine the proper remedies. Unless otherwise noted, the following summary is

drawn from the undisputed facts described in the Liability Opinion, the pleadings,

and trial exhibits.2

A. Sorrento Acquires Scilex.

Defendant Anthony Mack co-founded Plaintiff Scilex Pharmaceuticals Inc.

(“Scilex”) in 2012 and served as its President.3 In 2013, Scilex licensed a preclinical

product that would later become “ZTlido.”4 ZTlido is a pain relief product that

delivers lidocaine through a transdermal patch applied to the skin.5 When ZTlido

1 Sorrento Therapeutics, Inc. v. Mack, 2023 WL 5670689 (Del. Ch. Sept. 1, 2023) (“Liability Op.”). 2 Capitalized terms used herein but not defined have the meanings set forth in the Liability Opinion. Deposition testimony is cited as “(Surname) Dep.,” with dates for individuals who have multiple depositions; trial exhibits are cited as “JX”; and references to the docket are cited as “Dkt.,” with each followed by the relevant section, page, paragraph, exhibit, or docket number. Citations to testimony presented at trial are in the form “Tr. # (X)” with “X” representing the surname of the speaker, if not clear from the text. After being identified initially, individuals are referenced herein by their surnames without regard to honorifics. No disrespect is intended. 3 Liability Op. at *1–2. 4 Id. at *2. 5 Id. at *4.

2 was eventually approved by the FDA in 2018, it was approved only to treat post-

herpetic neuralgia, commonly known as shingles pain.6

On November 8, 2016, Plaintiff Sorrento Therapeutics, Inc. (“Sorrento,” and

together with Scilex, the “Plaintiffs”) acquired a 72% stake in Scilex for

approximately $50 million.7 Mack received $12 million for his Scilex equity in the

transaction and agreed to stay on as Scilex’s President.8 As President, Mack was

charged with identifying potential products for licensing and commercialization.9 In

connection with the Scilex acquisition, Mack signed a Restrictive Covenants

Agreement (“RCA”) preventing him from having any relationship with any entity

engaging in activities “directly or indirectly competitive with” ZTlido for two

years.10 Mack resigned from Scilex effective March 16, 2018.11

B. Mack Forms Virpax and Breaches the RCA.

On November 1, 2016—one week before the Scilex acquisition closed—

Mack formed Virpax Pharmaceuticals, LLC (“Virpax LLC”).12 On May 12, 2017,

6 See id. 7 Id. at *2, *5. 8 Id. at *5. 9 Id. at *6. 10 Id. at *5 (quoting JX 185 § 2). 11 Id. at *10. 12 Id. at *6.

3 Mack formed Virpax Pharmaceuticals, Inc. (“Virpax”), the other defendant in this

case (collectively, the “Defendants”).13

Shortly after Sorrento acquired its stake in Scilex, Mack began diverting

opportunities intended for Scilex to Virpax and other entities that he owned. On

August 24, 2016, the chief operating officer of MedPharm approached Mack and

expressed interest in collaborating with Scilex on a diclofenac spray foam product.14

Mack diverted the opportunity to his affiliated entity, Troy Capital Health, which

signed a confidentiality disclosure agreement (“CDA”) with MedPharm in October

2016.15 MedPharm later signed a similar agreement with Virpax LLC.16 In June

2017, Mack created a target product profile (“TPP”) for the diclofenac spray foam

product by making alterations to a Scilex draft TPP for a proposed diclofenac

patch.17 On April 11, 2017, Virpax entered into an option agreement to receive an

exclusive worldwide license for MedPharm’s MedSpray technology, which it later

exercised to develop Epoladerm.18 As of trial, Epoladerm had not yet been approved

by the FDA.19

13 Id. 14 Id. 15 Id. at *7. 16 Id. 17 Id. 18 Id. 19 Id.

4 Another licensor, LipoCure, was introduced to Scilex in November 2015,

before the Scilex acquisition closed.20 Mack and others at Scilex pursued the

licensing of LC400, a liposomal bupivacaine formulation in a stabilizing gel for

post-operative analgesia, for Scilex between November 2015 and January 2017.21

In January 2017, Mack told the principal of LipoCure that Sorrento was not presently

willing to commit capital to the project, but Sorrento would “continue to update our

business case for LC 400 so we are in the best position to support the development

[sic] LC 400 once ZTlido is approved or we receive additional funding.”22 In March

2017, Mack diverted the LipoCure opportunity to Virpax instead.23 Shortly

thereafter, LipoCure and Virpax executed a CDA and term sheet.24 They then

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