Delaware C-Corp
For startups planning venture funding, employee equity and institutional investment.
United States · Legal practice
Legal Services in the United States
Legal support for founders, investors and international businesses starting, operating and expanding in the United States.
How can we help you in the United States?
Speak with MostarUnited States legal hub
Support across the U.S. business lifecycle
Mostar supports international founders and investors with company formation, corporate maintenance, commercial legal work, immigration and cross-border coordination. This page is the central entry point to our U.S. practice.
Core U.S. legal services
The page is organized around three core service lines, with related legal support linked through dedicated pages.
- 01
Business Formation
- LLC and C-Corporation formation
- State and entity selection
- EIN and registered agent coordination
- Bylaws, operating and founder agreements
- Cap table and equity structuring
- 02
Business Maintenance
- Annual reports and franchise filings
- Corporate governance and resolutions
- Commercial contract support
- Corporate amendments and good standing
- Coordination with accountants and advisers
- 03
Business & Investor Immigration
- Visa category assessment
- E-2, EB-5, O-1 and L-1 coordination
- Petition and evidence preparation
- Business plan and investment structuring
- Coordination with U.S. immigration counsel
04 / State and entity
Choosing the right state and entity
The correct U.S. structure depends on fundraising plans, ownership, tax treatment, operating location and compliance needs.LLC
For flexible ownership and operating structures where venture capital is not the primary goal.
Wyoming LLC
Often considered for simple holding or online business structures, subject to tax and operational review.
Operating-state entity
For businesses with staff, offices, licences or substantial activity in a specific state.
03 / Sector experience
Business models we support in the United States
Different business models raise different questions around entity choice, contracts, taxes, banking, intellectual property, employment and compliance.- IT & SaaS CompaniesDelaware C-Corp or LLC structuring, founder and IP assignment documents, SaaS, licence and customer agreements, and investment and employee equity readiness.01
- Amazon & Marketplace SellersEntity and banking setup, marketplace contract and account issues, supplier, fulfilment and service agreements, and trademark and brand protection coordination.02
- Consulting BusinessesLLC or corporation setup, client and subcontractor agreements, independent contractor structure, and cross-border service arrangements.03
- E-commerce & Online BusinessEntity, payment and platform setup, terms, privacy and customer policies, vendor and fulfilment agreements, and brand and intellectual property support.04
- Agencies & Professional ServicesService agreements and scopes of work, team and contractor documentation, recurring compliance and governance, and cross-border billing coordination.05
- Investment & Holding StructuresHolding-company analysis, shareholder and investment documents, U.S. subsidiaries and acquisitions, and coordination with tax and investment advisers.06
06 / Company lifecycle
Running a U.S. company
Formation is only the first step. A U.S. company must remain in good standing and maintain clear legal and corporate records throughout its lifecycle.Form01
Choose entity and state.
Activate02
EIN, bank, governance.
Operate03
Contracts and compliance.
Grow04
Hiring, equity, investment.
Maintain05
Annual filings and records.
Change or Exit06
Amend, sell or dissolve.
Client situations
Common client situations
Clients usually come with a practical objective rather than a legal label. These are typical starting points.We want to launch a U.S. startup
We need help choosing the right entity, state and formation route.
Startup formation →We want to sell on Amazon
We need entity, banking and marketplace-ready structuring.
Amazon seller support →We already have a U.S. company
We need governance, contracts, filings or ongoing legal support.
Business maintenance →We want to relocate through a business
We need business and investor immigration support.
Business immigration →We are expanding from abroad
We need coordinated market entry and legal set-up in the U.S.
U.S. market entry →We need U.S. local counsel
We need a coordinated point of contact for U.S.-law matters.
Local counsel →The Mostar approach
Why international founders work with Mostar
One coordinated process from formation through ongoing support.One coordinated process
Formation, maintenance, immigration and cross-border work through one point of contact.
Founder-focused support
Practical legal help for startups, online businesses and international entrepreneurs.
Beyond registration
Ongoing governance, contracts and corporate support after formation.
Cross-border perspective
We coordinate the U.S. workstream with foreign structures and advisers.
Clear engagement models
Defined project scopes and ongoing support where appropriate.
Remote-first delivery
Most formation and coordination work can be handled remotely.
Guides and answers
U.S. legal guides
Practical starting points for founders and investors working with U.S. law.LLC or C-Corp for a Foreign Founder
Read guide →How to Set Up a U.S. Company for Amazon
Read guide →Business and Investor Visa Overview
Read guide →Common questions
Frequently asked questions
Common questions
Frequently asked questions
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