Mayer Brown LLP vs. Kelley Drye & Warren vs. Duane Morris LLP
Category by category. Sources: Vault 2027, Am Law 200 FY2025, and reported Chambers records from the years shown.
- Mayer Brown LLP
Est. 1881 · Chicago
- Kelley Drye & Warren
Est. 1836
- Duane Morris LLP
Est. 1904 · Philadelphia
Est. 1881 · Chicago
Mayer Brown LLP is a 1,000-plus-attorney firm, Am Law #27, founded in Chicago, IL. Jurisdiction-specific Chambers rankings include Band 1 in Antitrust, Capital Markets: Securitization: ABS, and Capital Markets: Securitization: RMBS. Operates from 19 offices worldwide.
Est. 1836
Kelley Drye & Warren is a ~260-attorney firm. Jurisdiction-specific Chambers rankings include Band 1 in Advertising: NAD Proceedings and Communications; Band 2 in Advertising: Transactional & Regulatory.
Est. 1904 · Philadelphia
Duane Morris LLP is a mid-size firm of ~742 attorneys, founded in Philadelphia, PA. Jurisdiction-specific Chambers rankings include Band 1 in Cannabis Law and Healthcare; Band 2 in Bankruptcy/Restructuring. Operates from 31 offices worldwide.
- Mayer Brown LLP#44
- Kelley Drye & WarrenNot Reported
- Duane Morris LLP#94
- Mayer Brown LLP#27
- Kelley Drye & Warren#146
- Duane Morris LLP#84
- Mayer Brown LLP14 records
- Kelley Drye & Warren2 records
- Duane Morris LLP2 records
- #44
- #27
- 14 records
- Vault rank
- Not Reported
- Am Law rank
- #146
- Reported Chambers Band 1 records
- 2 records
- Vault rank
- #94
- Am Law rank
- #84
- Reported Chambers Band 1 records
- 2 records
- Mayer Brown LLP$225,000
- Kelley Drye & Warren$225,000
- Duane Morris LLP$220,000
- Mayer Brown LLP$3.20M
- Kelley Drye & Warren$1.81M
- Duane Morris LLP$1.68M
- Mayer Brown LLP$2.17B
- Kelley Drye & Warren$291.80M
- Duane Morris LLP$758.38M
Revenue per lawyer
- Mayer Brown LLP$1.25M
- Kelley Drye & Warren$1.12M
- Duane Morris LLP$1.02M
- $225,000
- $3.20M
- $2.17B
- Revenue per lawyer
- $1.25M
- First-Year Comp
- $225,000
- Profits Per Partner
- $1.81M
- Firm revenue
- $291.80M
- Revenue per lawyer
- $1.12M
- First-Year Comp
- $220,000
- Profits Per Partner
- $1.68M
- Firm revenue
- $758.38M
- Revenue per lawyer
- $1.02M
- Mayer Brown LLP2,000
- Kelley Drye & WarrenNot Reported
- Duane Morris LLP1,950
- Mayer Brown LLPNot Reported
- Kelley Drye & WarrenNot Reported
- Duane Morris LLPNot Reported
- Mayer Brown LLP1:1
- Kelley Drye & WarrenNot Reported
- Duane Morris LLP0.6:1
- Mayer Brown LLP~1,750
- Kelley Drye & Warren~250
- Duane Morris LLP~750
Offices
- Mayer Brown LLP19
- Kelley Drye & Warren9
- Duane Morris LLP31
- 2,000
- Not Reported
- 1:1
- ~1,750
- Offices
- 19
- Billable target
- Not Reported
- Partnership track
- Not Reported
- US associates per partner
- Not Reported
- Firm size (rounded to 50)
- ~250
- Offices
- 9
- Billable target
- 1,950
- Partnership track
- Not Reported
- US associates per partner
- 0.6:1
- Firm size (rounded to 50)
- ~750
- Offices
- 31
- Mayer Brown LLPNot Reported
- Kelley Drye & WarrenNot Reported
- Duane Morris LLP100%
Class size
- Mayer Brown LLP69 (year not confirmed)
- Kelley Drye & WarrenNot Reported
- Duane Morris LLP18 (2026)
- Mayer Brown LLPFree market
- Kelley Drye & WarrenNot Reported
- Duane Morris LLPNot Reported
- Mayer Brown LLPCase by Case
- Kelley Drye & WarrenYes
- Duane Morris LLPNo
- Not Reported
- Class size
- 69 (year not confirmed)
- Free market
- Case by Case
- Offer rate
- Not Reported
- Class size
- Not Reported
- How associates get work
- Not Reported
- Specific practice area
- Yes
- Offer rate
- 100%
- Class size
- 18 (2026)
- How associates get work
- Not Reported
- Specific practice area
- No
Green marks the stronger for the same practice, market and year. Shared results are listed once. split some top tables.
Rank differences
- Mayer Brown LLPBand 1
- Kelley Drye & WarrenBand 1
- Duane Morris LLPBand 2
Firm-only and additional rankings remain available on each firm profile so missing coverage is not mistaken for a head-to-head loss.
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Data sources: Vault 2027, Am Law 200 FY2025, and reported Chambers records from the years shown. Chambers record counts can span years and reporting coverage varies; missing years or markets are not compared. Current Chambers bands were checked against each firm’s Chambers profile on Sep 26, 2026; where Chambers splits a table, every Elite firm ranks above every Highly Regarded firm. Missing values read “Not Reported”.