Dec 1, 2022Legal
Patexia Insight 161: Top CAFC Law Firms of 2022

In late October, we released our second annual CAFC Intelligence Report. The report provided high-level statistics and insights and evaluated the stakeholders participating in the patent-related CAFC appeals originating from the USPTO, ITC, or district courts. Gathering data from three different sources in one place was not easy, but providing a complete picture of all CAFC cases related to patents was our goal, making this report valuable. Today’s insight covers some of the best law firms participating in CAFC appeals during the period of our study.

Similar to other Patexia Intelligence reports, this report covered a five-year period from Jan., 1, 2017, through Dec., 31, 2021, using the latest case updates from Sept., 25, 2022. A total of 4,363 CAFC appeals were filed during the last five years, and from this number, 4,002 had been terminated as of Sept., 25, 2022. The latest data from this year from Patexia’s Litigation Analyzer indicates that 731 appeals were filed as of Nov., 28th, which is already ten percent more than the 665 appeals filed last year.

As seen above, the cases peaked in 2017 with 1,004 filings, then a moderate decline followed, with a sharper decline in 2021 as 194 fewer appeals were filed compared to the previous year. As revealed in Patexia 119, 60% of the appeals originate from the PTAB, mostly from the IPR proceedings. Although there should be some correlation between the IPR cases terminated and the CAFC appeals, in Patexia 154, we showed that the percentage of IPR decisions that were challenged in an appeal fluctuated from year to year.

Instead of being driven by the number of IPR cases filed and terminated, the analysis shows that the number of appeals mainly depended on the number of IPR proceedings that entered a decision, given that the denial of PTAB to initiate a proceeding is not appealable unless in rare circumstances. Patexia 158 covered, at length, the decline in appeals in 2021. However, the data from 2022 show a significant increase. If this increase continues, we may also see new lateral opportunities in this area.

Our data shows that a total of 1,124 law firms were involved in one or more of the 4,363 appeals filed from Jan., 1, 2017, through Dec., 31, 2021. Out of this number, 858 firms represented appellants, and 726 firms represented appellees, while some firms were active on both sides in different cases. On average, law firms representing appellants and/or appellees have been involved in 9.4 cases. However, our study found that a handful of firms have been extremely active, resulting in a large percentage of all cases being handled by a small number of firms.

In the following table, you will find a list of top law firms ranked because of their high activity or performance in CAFC cases. Being named on this list means that the law firm was in the top ten percent of 1,124 law firms.


Law FirmAll CasesAppellee CasesAppellant CasesRankCategory
Perkins Coie


134321Appellee Performance Rank
Sterne, Kessler, Goldstein & Fox197821164Overall Activity Rank
Kirkland & Ellis


86745Appellant Activity Rank
Quinn Emanuel Urquhart & Sullivan17199726Overall Activity Rank
Haynes and Boone, LLP


85208Appellee Activity  Rank
Mintz, Levin4827218Appellee Performance Rank
Wilson Sonsini


715710Overall Activity Rank
Kilpatrick Townsend & Stockton104485611Appellant Activity Rank
Greenberg Traurig LLP


444119Appellant Activity Rank
Fenwick62431926Appellee Activity Rank
Alston & Bird


433129Appellee Activity Rank
Morgan Lewis62293330Appellant Performance Rank
Erise IP P.A.


281745Appellee Performance Rank
Polsinelli30141646Appellee Performance Rank
Wolf, Greenfield & Sacks


211464Appellant Activity Rank
Fitch, Even, Tabin & Flannery LLP2591674Appellant Activity Rank
Haug Partners


612101Appellant Activity Rank
Nelson Mullins862116Appellee Performance Rank


  • Perkins Coie ranked the best performing firm on the appellee side, representing appellees in 134 out of 166 cases. Amazon, Inc. and Intel Corporation were the top CAFC clients.
  • Sterne, Kessler was one of the most active law firms overall, with 197 appeals in total. The firm was active on both sides, representing the appellees and appellants on 82 and 116 cases, respectively. Xperi Corporation, Teva Pharmaceuticals, and Wirtgen Group were among their top CAFC clients.
  • Kirkland & Ellis, with a total of 160 cases, was active on both sides. The firm was ranked the 5th most active firm on the appellant side. Abbott Laboratories, Cisco, and Teva Pharmaceuticals were among their CAFC practice.
  • Quinn Emanuel, with 99 and 72 representations of appellees and appellants, respectively, was ranked the 6th most active firm overall. They have worked closely with Google, Universal Secure Registry LLC, and Mercedes-Benz.
  • Mintz, Levin ranked the 8th best-performing firm on the appellee side, representing appellees in 27 cases out of 48 in total. Elm 3DS Innovations, Advanced Micro Devices, Inc, and ParkerVision were their top CAFC clients.
  • Haynes and Boone, LLP represented appellees in 85 out of 105 and ranked the 8th most active law firm for representing appellees. They have represented Cisco, Apple, and Ericsson among their clients.
  • Wilson Sonsini was active on both sides of the appeals, representing appellees and appellants in 71 and 57 cases, respectively. The firm was ranked the 10th most active firm overall. Viatris Inc., Visa, and Interactive Brokers were their top CAFC clients.
  • Kilpatrick Townsend & Stockton participated in 104 appeals in total, where in 56 cases, they represented appellants. The firm was ranked the 11th most active firm on the appellant side. Their top CAFC clients were Adidas, Viatris Inc., and Gree Inc.
  • Greenberg Traurig represented the appellants in 44 out of 84 cases in total and ranked the 19th most active firm on the appellant side. They have worked closely with Satco Products, Inc., B. Braun Holding GmbH & Co. KG, and Cooler Master Technology.
  • Fenwick, with 43 cases on the appellee side out of 62 in total, ranked as the 26th most active firm for appellees. Amazon, Inc., UCB, and Supercell were among their top CAFC clients.
  • Alston & Bird was another firm active on the appellee side, ranked as the 29th most active firm, representing appellees in 43 of 74 cases in total. They have worked closely with Universal Electronics, Diebold Nixdorf Inc., and Schlumberger.
  • Morgan Lewis represented appellants in 33 out of 62 cases and ranked as the 30th best-performing firm on the appellant side. Techtronic Industries, TCL Corporation, and IP Bridge were some of their top CAFC clients.
  • Erise IP P.A. ranked as the 45th best-performing firm on the appellee side, representing appellees in 28 out of 45 cases in total. They have closely worked with Apple Inc., Spin Master, and Garmin Ltd. for CAFC appeals.
  • Polsinelli represented appellees in 14 out of 30 cases in total. The firm was ranked the 46th best performing firm on the appellee side. III Holdings 4, LLC and Anza Technology Inc. were among their top clients.
  • Wolf, Greenfield & Sacks represented the appellees in 21 cases out of 35 in total. The firm was ranked the 64th most active firm on the appellee side. University of Minnesota, RPX Corporation, and Sony Group Corporation were some of their top CAFC clients.
  • Fitch, Even, Tabin & Flannery was the 74th most active firm on the appellant side, representing appellants in 16 cases out of 25 in total. They have closely worked with Lone Star Silicon Innovations LLC, Medline Industries, and ContentGuard Inc.
  • Haug Partners represented appellants in 12 out of 18 cases and ranked as the 101st most active firm. Takeda Pharmaceutical Company Limited, Nektar Therapeutics, and Cosmo Technologies Inc. were among their CAFC top clients.
  • Nelson Mullins’ CAFC cases were mostly on the appellee side and ranked as the 116th best-performing firm on the appellee side. Green Cross, Tietex International, and Trevor Ashline were their top clients for CAFC cases.

The complete CAFC Intelligence 2022 further provides the full rankings of all entities and different statistics related to the CAFC appeals, originating courts, precedential vs. nonprecedential decisions, and ultimately outcome analysis which is the basis for our performance rankings. We have also included a list of lateral moves that have taken place since the publication of our first CAFC report in October 2021.



CAFC Intelligence 2022 was our second report covering all patent-related cases before the Court of Appeals for the Federal Circuit (CAFC). To find the best and fairest methods for evaluating the performance of companies, attorneys, law firms, and judges in CAFC cases, we used the feedback provided by the CAFC community.

The Activity Score was developed based on the number of cases in which companies and their representing attorneys/firms and judges, were involved as appellants, appellees, or both. As updates from the previous year, we included a weight system to differentiate cases from different years. However, most of the CAFC community argued that more recent activity is a better indicator that shows how active an attorney, law firm, or company is. Therefore, we reduced the weight of the older cases in the activity score, ultimately making it possible for an entity with 5 cases in 2021 to be ranked higher than an entity with the same number of cases but distributed throughout the period of our study.

For the Success Score, Appellants and Appellees were scored for various CAFC outcomes as follows:

OutcomeAppellantAppelleeAppellant. Atty/FirmAppellee Atty/FirmJudge


In-Part Outcomes (Affirmed-in-Part, Vacated-in-Part, Reversed-in-Part, etc.)
Vacated and/or Remanded Outcomes0.750.250.750.250.75


According to our case-by-case analysis of CAFC cases and discussions with CAFC attorneys, the partial decisions, e.g., “Affirmed-in-Part, Vacated-in-Part, Remanded-in-Part,” were not easy to differentiate, and when it came to which side ultimately came out better from the CAFC appeal, the outcomes were mixed. However, the rest of the categories were self-explanatory, e.g., ‘Affirmed,’ ‘Reversed,’ ‘Vacated/Remanded’’ etc., so we allocated points accordingly.

The success scores, similar to our other IP Insight reports, were used to develop the Performance Score as a weighted average of activity and success scores. This additional scoring metric helps account for what most clients look for in an attorney:extensive experience and a high success rate on those cases. High case numbers will inevitably dilute performance over time, making it less than ideal for comparing the performance scores of firms/attorneys with very different caseloads. By taking these considerations into account, this new “Performance Score” allows us to score and rank companies, attorneys, and firms for both Activity and Success combined.


Stay tuned, as in the upcoming insights, we will be covering more statistics from this report, including a list of the top CAFC attorneys from the best law firms.

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