Patent Expert Witnesses, 2025: The Year in Numbers

2025 was the second full calendar year under the amended Federal Rule of Evidence 702 and the year in which the Federal Circuit, sitting en banc for the first time on a damages expert in over a decade, addressed the methodology behind a reasonable-royalty opinion. The combination produced a tighter record than 2023 or 2024. On WitnessLens, district court Daubert orders in 2025 ran longer and engaged the Rule 702 reliability prongs more directly than in prior years. The PTAB issued more pointed credibility findings. The expert side of patent litigation has more public signal in it than it did twelve months ago, and the aggregates from 2025 are the cleanest baseline a retaining partner can work from going into 2026.

The headline numbers are below.

Daubert outcomes for patent cases

District courts ruled on patent-related Daubert motions in 2025 with an outcome split of roughly 51% denied, 35% granted in part, and 14% granted in full. The pattern continues what the amended FRE 702 set in motion. Courts are more willing than they were pre-amendment to limit expert testimony at the margins, less willing than commentators initially predicted to exclude experts wholesale.

The partial-to-full exclusion ratio sits at about 2:1. For every expert who was thrown out entirely in 2025, two were trimmed at specific opinions while remaining permitted to testify on the rest. That ratio matters for litigation budgeting. A granted-in-part order is rarely fatal to a case, but it reshapes the trial presentation and the settlement value of the underlying claim.

Damages experts drew the largest share of Daubert motions in 2025, with technical experts a distant second. The post-EcoFactor period has not reduced damages expert motion practice. It has sharpened it.

PTAB credibility, distributed

The PTAB does not write Daubert orders. It credits or discounts expert testimony in final written decisions, and the pattern aggregates cleanly across thousands of opinions. Among the roughly 70 patent experts with 10 or more PTAB evaluations through year-end 2025, the credit-rate distribution looked like this:

• About 28 experts at 80 to 100% credited.
• About 14 experts below 20%.

The median sat near 75%. The tail matters more than the median. One in five repeat experts, those with 10 or more PTAB appearances in their record, are credited less than 20% of the time. The Board has now built a long enough archive that the same experts who get discounted in one decision tend to get discounted in the next, and the cumulative effect is visible to anyone who reads decisions in sequence.

The credit rate is not the same thing as the win rate. An expert can be credited fully and still be on the losing side of a final written decision because the petitioner's prior-art combination did not reach the claim. But credit rate is the closest available proxy for whether the Board is treating the expert's analysis as analytically reliable, and it is the metric that travels into Daubert hearings on the district court side.

Hourly rates and side-mix

Rate disclosures in 2025 declarations show technical patent experts charging roughly $450 to $800 per hour for the repeat-player population, with most disclosed numbers clustering between $500 and $700. Damages experts disclosed higher rates, typically $700 to $1,100, and reputable economists pulled in still more for trial work.

Side-mix among the repeat experts skews toward petitioner-side work in IPR proceedings. Most experts with 10 or more PTAB appearances spent more than half of those appearances on petitioner declarations. The pattern reflects who is filing IPRs (operating companies and defendants) and how the expert pool sorts itself. District court patent litigation runs closer to balanced. The expert who has appeared 40 times for petitioners in IPR and 8 times for plaintiffs in district court is doing different work in each forum and disclosing different things on the record.

The Federal Circuit's role

Two 2025 decisions did most of the doctrinal work at the appellate level. EcoFactor, decided en banc, addressed the methodology required for a damages expert to opine on a reasonable royalty. The court was specific about the analytical chain the expert has to walk through and the documentation that supports each step. Rex Medical (2025) reinforced the same direction by affirming a district-court JMOL that reduced a $10 million jury verdict to $1 nominal damages after the damages expert was excluded for failing to apportion a multi-patent comparable license.

District courts cited these decisions through the back half of 2025 in patent Daubert orders. The citation pattern is itself a signal. Trial courts read EcoFactor as authorizing tighter gatekeeping on damages expert methodology, and the granted-in-part numbers reflect that read.

Practical implications

Retaining partners going into 2026 are working with more record than they had a year ago, and the record is more discriminating. A few practical points fall out of the 2025 aggregates.

First, the bottom-quartile experts on PTAB credit rate carry visible reputational cost. The Board has issued enough adverse credibility findings on the same individuals that opposing counsel can cite a string of them in deposition.

Second, the hourly-rate footprint does not predict credit rate. The expert charging $750 per hour is not measurably more credible than the expert charging $525. Rate is a partner-comfort signal and a budget input, not a quality proxy.

Third, the partial-exclusion outcome is the modal Daubert result. Pretrial strategy should be built around what a granted-in-part order would do to the trial presentation, not around the assumption that the expert is either fully in or fully out.

Fourth, side-mix matters for retention conflict and for cross-examination preparation. An expert with a 40-to-1 petitioner-side record will be cross-examined differently from one with a balanced record, and the disparity is now easy to surface from public filings.

A note on the data

The figures in this post are aggregated from PTAB final written decisions and district court Daubert orders involving patent expert witnesses on WitnessLens. The Daubert outcome split is based on patent-related motions decided on the merits in 2025. PTAB credit-rate distribution is computed across experts with 10 or more evaluations on WitnessLens through year-end 2025. Hourly rates come from declarations and deposition transcripts where the rate is disclosed on the record. Methodology details are on the methodology page.