← Every lobbying firm
Mayer Brown LLP
A registered lobbying firm, and the clients it files for. Everything here comes from the quarterly disclosures it is required to make under the Lobbying Disclosure Act. Filed as MAYER BROWN LLP.
Clients
12
named in its filings
Filings
24
2026
Fees reported
$450K
across every filing
Who it represents
Largest first, by what the filings report being paid.
| Client | Fees |
|---|---|
| OnsemiON Semiconductor Corp | $330K |
| NovocureNovocure Ltd | $60K |
| Verizon Communications Inc And Various SubsidiariesVerizon Communications Inc | $30K |
| Arista Networks, Inc.Arista Networks Inc | $10K |
| Huntsman CorporationHuntsman Corp | $10K |
| Visa Inc.Visa Inc | $10K |
| Sonos Inc.Sonos Inc | — |
| Live Nation Entertainment, Inc.Live Nation Entertainment Inc | — |
| Abbott Laboratories | — |
| Uber Technologies, Inc.Uber Technologies Inc | — |
| Palo Alto Networks, Inc.Palo Alto Networks Inc | — |
| American ExpressAmerican Express Co | — |
Every filing
Newest first, and within a year the largest.
| Client | Fee |
|---|---|
| Onsemi | $110K |
| Onsemi | $110K |
| Onsemi | $110K |
| Novocure | $40K |
| Verizon Communications Inc And Various Subsidiaries | $30K |
| Novocure | $20K |
| Arista Networks, Inc. | $10K |
| Visa Inc. | $10K |
| Huntsman Corporation | $10K |
| Sonos Inc. | — |
| Live Nation Entertainment, Inc. | — |
| Live Nation Entertainment, Inc. | — |
| Abbott Laboratories | — |
| Uber Technologies, Inc. | — |
| Verizon Communications Inc And Various Subsidiaries | — |
| Palo Alto Networks, Inc. | — |
| American Express | — |
| Uber Technologies, Inc. | — |
| Sonos Inc. | — |
| Abbott Laboratories | — |
| Arista Networks, Inc. | — |
| Palo Alto Networks, Inc. | — |
| American Express | — |
| Huntsman Corporation | — |
Source: quarterly LD-2 disclosures filed under the Lobbying Disclosure Act. A fee covers everything the firm did for that client in the period, so it cannot be attributed to any one issue on the list. A filing that states no figure contributes nothing rather than a zero. Clients with no ticker are kept: a trade association or a foreign ministry is as much a part of what the firm does as a listed company.