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- Nationstar Mortgage LLC
About Nationstar Mortgage LLC
Nationstar Mortgage LLC was a major American mortgage lender and servicing company best known to consumers through the Mr. Cooper brand. The company serviced residential mortgages, collected monthly payments, administered escrow accounts, processed loan modifications, handled payoff requests, provided mortgage assistance, and supported homeowners throughout the life of their loans.
Nationstar adopted the consumer-facing Mr. Cooper name in 2017, while Nationstar Mortgage LLC continued to exist as the licensed legal mortgage entity behind the brand. Its long-standing corporate operations were located at 8950 Cypress Waters Boulevard, Coppell, Texas 75019.
The company’s status changed substantially in 2025 and 2026. Rocket Companies completed its acquisition of Mr. Cooper Group on October 1, 2025. During the first quarter of 2026, Nationstar Mortgage LLC was merged into Rocket Mortgage, LLC. As a result, Nationstar Mortgage is no longer an active standalone mortgage entity in the same form described on older corporate-directory pages. Current mortgage-servicing customers should use the current Mr. Cooper/Rocket support channels rather than treating Nationstar as an independent corporate organization.
Quick Information
Corporate Phone Number
Nationstar Mortgage no longer operates as a separate active corporate entity. Current Rocket Companies corporate contact: 313-373-7990
Customer Service Number
Current Mr. Cooper mortgage complaint and servicing support: 888-806-9263
Corporate Office Address
Historical Nationstar/Mr. Cooper office: 8950 Cypress Waters Blvd., Coppell, TX 75019
Headquarters Address
Nationstar Mortgage was merged into Rocket Mortgage in Q1 2026. Current Rocket Companies headquarters: 1050 Woodward Avenue, Detroit, MI 48226-1906
Current mortgage support should be handled through Mr. Cooper/Rocket authenticated servicing channels.
Industry
Mortgage Lending and Mortgage Servicing
Founded
Nationstar traces its corporate history to the 1990s and later operated under the Mr. Cooper brand
No. of Employees
No current standalone employee count applies because Nationstar Mortgage was merged into Rocket Mortgage in 2026.
Corporate Office Hours
Current servicing-support hours vary by Mr. Cooper/Rocket channel.
Website
Customers should use current Mr. Cooper and Rocket Mortgage websites rather than legacy Nationstar sites.
Investor Relations
Handled through Rocket Companies, Inc., NYSE ticker RKT
Careers Page
Rocket Companies Careers
Nationstar Mortgage LLC Products & Services
Mortgage Servicing
Nationstar’s principal business included servicing residential mortgage loans.
Servicing activities included collecting payments, managing accounts, handling escrow, processing statements, and supporting borrowers.
Mr. Cooper Mortgage Servicing
The Mr. Cooper brand became Nationstar’s primary consumer-facing mortgage identity.
Mortgage Payments
Borrowers could make regular monthly mortgage payments through online, telephone, automatic-payment, and mail channels.
Automatic Payments
Customers could establish recurring electronic mortgage payments from eligible bank accounts.
Escrow Administration
Nationstar managed property-tax and homeowners-insurance escrow accounts for qualifying loans.
Mortgage Statements
Borrowers received regular statements showing payment amounts, principal, interest, escrow, fees, and account activity.
Payoff Requests
Customers could request mortgage payoff information when refinancing, selling a property, or paying off a loan.
Loan Assistance
Borrowers experiencing financial hardship could seek assistance and explore available loss-mitigation options.
Loan Modification
Qualifying borrowers could be reviewed for loan modifications subject to investor and program requirements.
Forbearance
Temporary payment-relief options could be available for eligible homeowners experiencing qualifying hardship.
Insurance Claims
Mortgage servicers also assist with certain property-insurance claim processes when the servicer has an interest in the property.
Property Tax Support
Servicing operations include administration of tax payments for loans with escrow accounts.
Mortgage Refinancing and Origination
Mr. Cooper also participated in mortgage origination and refinancing before becoming part of Rocket Companies.
Nationstar Mortgage LLC Corporate Phone Numbers
Corporate Phone Number
Nationstar Mortgage no longer maintains a separate current corporate switchboard after its 2026 merger into Rocket Mortgage.
Current Rocket Companies Corporate Number
313-373-7990
This is Rocket Companies’ verified current corporate contact.
Historical Nationstar / Mr. Cooper Number
888-480-2432
This number appeared in historical Nationstar and Mr. Cooper servicing documents.
It should not automatically be treated as the preferred current servicing line.
Current Mr. Cooper Customer Service and Complaint Number
888-806-9263
Mr. Cooper currently publishes this number for customers who need help with mortgage concerns or complaints.
Customer Support Number
888-806-9263
This is the more appropriate current support contact for existing Mr. Cooper mortgage-servicing complaints.
Toll-Free Number
888-806-9263
The current Mr. Cooper complaint-support number is toll-free.
Qualified Written Request Support
Customers who cannot resolve an issue by chat or telephone can submit a Qualified Written Request to the published servicing correspondence address.
Investor Relations Number
Nationstar no longer maintains separate Investor Relations.
Investor matters are now handled through Rocket Companies, Inc.
Rocket Companies Investor Relations Email
Media / Press Number
Media requests relating to the current parent company should use Rocket Companies’ media-relations system.
Human Resources Number
Nationstar no longer operates a standalone public HR department.
Employment inquiries should be directed through Rocket Companies Careers.
How to Reach a Real Person at Nationstar Mortgage / Mr. Cooper
Customers with a mortgage formerly associated with Nationstar or currently serviced under the Mr. Cooper brand should use 888-806-9263 or the authenticated Mr. Cooper support system. Mr. Cooper specifically recommends starting with chat or telephone support when a borrower has a problem with the mortgage-servicing experience.
Do not rely on outdated Nationstar numbers without checking current servicing documents. Because Nationstar was merged into Rocket Mortgage during Q1 2026, the legal entity and servicing structure has changed. Your monthly statement, online account, or current mortgage correspondence should identify the correct servicer and contact information for your particular loan.
Nationstar Mortgage LLC Headquarters & Corporate Office Address
Historical Nationstar Mortgage / Mr. Cooper Corporate Office
Nationstar Mortgage LLC / Mr. Cooper
8950 Cypress Waters Blvd.
Coppell, TX 75019
This was Nationstar Mortgage’s primary corporate location before the 2026 merger.
Nationstar Mortgage Current Status
Nationstar Mortgage LLC was merged into Rocket Mortgage, LLC during the first quarter of 2026.
It should no longer be presented as an independent active company with its own current headquarters.
Current Rocket Companies Headquarters
Rocket Companies, Inc.
1050 Woodward Avenue
Detroit, MI 48226-1906
This is the current headquarters of Nationstar’s ultimate parent organization following the Mr. Cooper acquisition.
Qualified Written Request Mailing Address
Mr. Cooper
P.O. Box 619098
Dallas, TX 75261
Mr. Cooper currently publishes this address for Qualified Written Requests and certain formal servicing complaints.
Historical Customer Service Address
Mr. Cooper
Attn: Customer Service
8950 Cypress Waters Blvd.
Coppell, TX 75019
This address appears in Nationstar/Mr. Cooper servicing records but should be treated in the context of the company’s current Rocket ownership and merger status.
How to File a Complaint Against Nationstar Mortgage / Mr. Cooper
Step 1: Confirm Your Current Mortgage Servicer
Review your latest mortgage statement or online account.
Because Nationstar Mortgage was merged into Rocket Mortgage in 2026, first confirm which company currently services your loan.
Step 2: Contact Mr. Cooper Support
For a mortgage still supported through Mr. Cooper servicing channels, call:
888-806-9263
You can also use the current Mr. Cooper chat system.
Step 3: Explain the Problem Clearly
Provide your loan information, transaction dates, payment amounts, escrow details, or other relevant facts.
Avoid sending passwords or unnecessary sensitive information through unsecured channels.
Step 4: Request Escalation
If the first representative cannot resolve the issue, request escalation to a servicing supervisor or specialized department.
Step 5: Gather Supporting Documentation
Keep mortgage statements, payment confirmations, escrow records, insurance documents, tax records, correspondence, and screenshots.
Step 6: Submit a Qualified Written Request
For qualifying mortgage-servicing errors or information requests, borrowers can submit a formal Qualified Written Request.
Mail it to:
Mr. Cooper
P.O. Box 619098
Dallas, TX 75261
Step 7: Include Complete Information in the Written Request
Include enough information to identify the mortgage account, explain the error or information request, and provide supporting evidence.
Do not include unnecessary sensitive credentials.
Step 8: Keep Proof of Mailing and Copies
Retain a copy of the complaint and proof showing when it was mailed.
Mr. Cooper states that it generally acknowledges a Qualified Written Request within five business days.
Step 9: Contact Rocket Mortgage if Your Loan Has Transitioned
If your loan or servicing relationship has formally moved into Rocket Mortgage systems, follow the current Rocket Mortgage support process shown on your latest servicing correspondence.
Step 10: Contact the CFPB
Mortgage borrowers can submit unresolved servicing complaints to the Consumer Financial Protection Bureau when appropriate.
Provide copies of statements, complaint letters, and previous responses.
Step 11: Contact the Appropriate State Mortgage Regulator
State banking or mortgage regulators may also review qualifying servicing or lending complaints.
Step 12: Keep Complete Records
Maintain a full timeline of payments, telephone calls, letters, representative names, case numbers, and responses.
Step 13: Consider Additional Legal or Regulatory Options
For serious unresolved foreclosure, servicing, escrow, payment, or contractual disputes, borrowers may wish to review federal mortgage-servicing protections, state law, housing-counseling resources, or independent legal advice.
