Starting a business in St Louis? The entity choice you make now shapes your tax, liability, and exit options for years.
Missouri business formation runs through the Missouri Secretary of State's Corporations Division in Jefferson City. Most St Louis founders choose an LLC under Missouri Revised Statutes Chapter 347; the alternative paths are S-corp and C-corp under Chapter 351. The 10 firms below handle Missouri entity formation, multi-state qualification, operating agreements, and post-formation governance.
Missouri LLC formation is administratively simple - the state filing fee is $50 online ($105 by mail), and the Missouri Secretary of State turns most filings around in one business day. The harder questions are entity choice (LLC vs. S-corp vs. C-corp), tax election (default vs. S-corp tax), operating agreement structure (member-managed vs. manager-managed, distribution waterfalls, vesting), and multi-state qualification if you do business outside Missouri. Pick a firm that can answer these questions, not just file the paperwork.
These 10 firms are filtered against Chambers USA, Best Lawyers Best Law Firms 2026, Super Lawyers Missouri, and local recognition. The list spans BigLaw practices for high-growth startups raising institutional capital down to boutique flat-fee formation shops for solo founders.
How we picked these 10: We reviewed peer rankings (Chambers USA, Best Lawyers, Super Lawyers, Avvo, Martindale-Hubbell, Justia), bar association recognition, and published case results. Firms that appeared consistently across at least two independent sources made the list. We do not accept payment for placement, and we do not write sponsored reviews. More on our methodology →
Practice focus: Entity formation, venture-backed startups, LLC operating agreements, multi-state qualification, M&A-ready structuring
St Louis-HQ global firm. Strong fit for founders raising institutional capital or planning multi-state operations from day one. Chambers USA Missouri Corporate/M&A recognition.
Practice focus: Entity formation, LLC and corporation structuring, healthcare and financial services entities, multi-state expansion
St Louis-HQ regional powerhouse. Strong sector verticals in healthcare, financial services, and food/agribusiness with associated formation work. Chambers USA Missouri Corporate/M&A.
Practice focus: Entity selection, formation, operating agreements, shareholder agreements, founders' equity
St Louis-HQ firm. Deep middle-market corporate practice. Frequently retained for entity formation and ongoing corporate governance for closely held businesses. Chambers USA Missouri Corporate.
Practice focus: LLC formation, corporate structuring, joint ventures, founders' agreements, Series LLC structures
St Louis-HQ firm with renowned corporate and IP practices. Chambers USA Missouri Corporate/M&A recognition. 16 lawyers and 7 practice areas recognized in Chambers USA 2025.
Practice focus: Closely held business formation, LLC and S-corp structuring, family business governance, partnership agreements
St Louis-HQ firm. Strong middle-market and closely held business practice. Frequently retained for LLC formation, family business succession, and founder equity arrangements. Chambers USA Missouri.
Practice focus: Healthcare entity formation, life sciences startups, joint ventures, corporate structuring
Midwest-anchored AmLaw 100 firm. Strong healthcare and life sciences corporate practice. Useful when entity formation crosses into regulatory licensing (healthcare, life sciences, financial services).
Practice focus: Entity formation, corporate structuring, joint ventures, tax-advantaged structures
Mid-American firm. St Louis office handles entity formation and ongoing corporate governance for middle-market clients. 172 attorneys recognized in Best Lawyers in America 2026.
Practice focus: Closely held business formation, LLC structuring, partnership agreements, succession planning
St Louis legacy firm (Greensfelder Hemker & Gale, founded 1895) merged with Ulmer & Berne in 2024. Strong closely held business bench in St Louis. Chambers USA Missouri Corporate.
Practice focus: Entity selection, LLC and corporate formation, operating agreements, ongoing corporate counsel
St Louis boutique business firm. Founder-friendly fee scale. Assists entrepreneurs and startups through formation, draft necessary documents, and position for future financing. Useful for solo or small founder teams.
Practice focus: Business formation, entity selection, LLC and corporation drafting, organizational documents, corporate formalities
20+ years serving St Louis-area businesses. Attorney Marc Jacob helps founders decide on entity structure, draft formation documents, and set up corporate formalities. Useful for first-time founders at a boutique fee scale.
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Filing the Articles of Organization with the Missouri Secretary of State takes one business day online. A standard single-member LLC formation engagement (entity selection, Articles, operating agreement, EIN, opening resolutions) typically closes in 1 to 3 weeks. Multi-member LLCs with vesting, distribution waterfalls, or capital call provisions take 2 to 6 weeks. Multi-state qualification (foreign registration) adds 2 to 4 weeks per state. Venture-financing-ready C-corp conversion runs 4 to 8 weeks.
St Louis flat-fee LLC formation: $750 to $1,500 boutique; $1,500 to $3,500 mid-size firm; $3,500 to $8,500 BigLaw. Multi-member LLC with custom operating agreement: $2,500 to $7,500 boutique; $5,000 to $25,000 mid/large firm. C-corp conversion for venture financing: $7,500 to $25,000. Hourly rates at large St Louis firms: $400 to $850/hr partner. Ongoing corporate counsel (annual retainer): $5,000 to $50,000/year.
Most St Louis firms doing this work are competent. A few patterns predict trouble.
Guaranteed outcomes. No ethical attorney can guarantee a result. If a firm promises a specific outcome, walk away.
The disappearing partner. You meet a senior partner at intake, then never speak to them again. The matter is handled by an unsupervised junior or paralegal. Ask in writing who will be your day-to-day attorney.
Pressure to sign immediately. Reputable firms give you the engagement letter in writing, time to read it, and the option to take it home. High-pressure intake is almost always a sign of a volume mill, not a careful practice.
No verifiable track record. The firm should be able to point to verdicts, settlements, peer rankings, or bar recognition. Specific numbers, named matters, and third-party rankings are evidence. Brochure phrasing is not.
Vague fee terms. "Do not worry about cost" is a red flag. Every legitimate St Louis firm will give you a written engagement letter with the fee structure, what is covered, what triggers extra charges, and what happens if you change counsel.
Most St Louis firms on this list offer a free or low-cost initial inquiry call. Use it. Bring a list of questions and write down the answers. Compare across at least two firms before you sign.
Default answer for most St Louis founders: LLC taxed as a partnership (or as a sole proprietorship for single-member). The S-corp election is useful when self-employment tax savings justify the additional payroll and corporate-formality costs - typically when net income clears $80,000+ for the owner.
Missouri authorizes Series LLCs (RSMo 347.186). A Series LLC allows multiple internal 'series' under a master LLC, with separate liability and bookkeeping for each. Used for real estate portfolios, multi-line businesses, and asset-segregation strategies. Not all states recognize them, so multi-state exposure is the main risk.
Yes - every Missouri LLC and corporation must maintain a registered agent with a Missouri physical address. You can serve as your own registered agent if you have a Missouri street address (not a P.O. box). Commercial registered agent services run $50 to $300/year.
Online filings through the Missouri Secretary of State are typically processed in one business day. Paper filings take 5 to 10 business days. Expedited paper filings (additional fee) take 1 to 2 business days.
Missouri does not require an operating agreement for an LLC, but the default statutory rules (RSMo 347) rarely match what founders actually want. Without one, default rules govern member voting, distributions, dissociation, and dissolution - usually badly. For any LLC with more than one member or any LLC where the owner has personal liability concerns, an operating agreement is essential.
Missouri requires an annual registration report from corporations (not LLCs) by the end of the month of incorporation. The fee is $20 to $45 depending on entity type. Missouri LLCs do not file annual reports - they only file when there are changes (officers, registered agent, address).
Yes, but if you 'transact business' in another state, you may need to register there as a foreign LLC. The 'transacting business' test varies by state; isolated transactions usually don't trigger it. Get advice before you have employees, real estate, or recurring contracts in another state.
Member-managed is the Missouri default. Useful for single-owner or co-founder LLCs where all owners run the business. Manager-managed is useful when you have passive investors who don't run day-to-day operations or when you want to designate one founder as the legal manager.
For a Missouri-based business, a Missouri LLC is almost always the right choice (no registration fees in two states, no franchise tax in Delaware). A Delaware LLC makes sense for businesses planning to raise venture capital, businesses with passive investors who insist on Delaware governance, or businesses planning to list on a public exchange.
Missouri does not have a statewide business license requirement, but St Louis City and most St Louis County municipalities have local business license requirements. Industry-specific licenses (alcohol, healthcare, financial services, real estate) are separate. Confirm requirements with your municipality and any state regulatory agency that covers your industry.
One last thing. Choosing a lawyer is personal. Read the reviews. Call two or three firms before you sign. Ask each one: How many matters like mine have you handled in the last three years? The answer tells you everything. — The LawFirmSquare team