3 Best Foreign Registration Services in Missouri (2026): Who to Ask First
Wondering about foreign registration services in Missouri, for 2026 our order is Mainstay Filing ($199), MO Registered Agent.org ($199) and Missouri Registered Agent.co ($199). Registering costs $105 at Missouri for every filer, and services add $397 to $497 over three years.
Answered by the Ask About LLC editorial team ·
Four quick answers
What does the state charge to register?
$105
Home-state certificate?
Yes (60 day age limit)
Once registered
Nothing to file
Our pick
Mainstay Filing, MO Registered Agent.org then Missouri Registered Agent.co
3. Missouri Registered Agent.co: best for one more state only
Service $199 plus $105 to the state; agent renewal $99
Missouri Registered Agent.co is the third answer because registering costs $199 over the state fee, with the agent covered in year one, then $99 a year.
It charges the same as MO Registered Agent.org, which makes the order between them a close call.
What the price covers
Missouri registration filing
A year of agent service to start
Good news
Agent renews at $99 afterward
$199 plus the state fee
First-year agent service is covered
The catch
Serves Missouri alone, so the home state needs another agent
Registering costs $105 at the state, plus $199 if you hire help.
Add three years of state fees, registration included, and you get $105. sos.mo.gov, read in October 2026 for this answer
Which form do I file, and with whom?
You need one document, the Application for Registration of a Foreign Limited Liability Company (Form LLC 4), and the Missouri Secretary of State, Corporations Division is where it is sent.
Attach certificate of good standing/existence from the home state issued within the last 60 days.
Is there a filing that repeats?
Nothing has to be filed on a schedule after registering.
What put number one on top?
Mainstay Filing does best on chores the price takes care of, which carries 29% of our score.
Two questions carry most of the weight, what you pay over three years (33%) and chores the price takes care of (29%), and three smaller ones follow.
With two states in play, a provider for every state ranks above MO Registered Agent.org.
Every line above points to the state's own page. The total under them is ours, and it covers the filing, two reports and any minimum tax, nothing that varies by newspaper or county.
Still wondering?
Do I still need an agent in my home state?
Expect to name one in each state. Mainstay Filing is active in all fifty, so it can serve the pair together.
What do the picks cost over three years?
For three years you would pay $497 at Mainstay Filing, $397 at MO Registered Agent.org, $397 at Missouri Registered Agent.co, before state fees.
Where do these numbers come from?
State fees come from Missouri's official documents, and service fees come from each company's own pricing page. Both carry dates on this page.
Do I have to use a service?
Not at all. The state takes filings from owners directly. A service just saves you time, and it can double as your agent.
Will a service file the registration for me?
They do. All the picks prepare and send the registration, so the only thing that changes with your choice is the service fee.
Who should I ask first about a foreign registration service in Missouri?
Mainstay Filing comes first: registering costs $199 and the registered agent is free until year two. Next are MO Registered Agent.org and Missouri Registered Agent.co.
Sources for this answer
Ask-about note for RSMo 347.037: the state publishes it at revisor.mo.gov, confirmed August 2026, so you can look it up yourself
Ask-about note for Missouri formation fee: Filing fee: the state publishes it at sos.mo.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Missouri registered agent statute: the state publishes it at revisor.mo.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Missouri Secretary of State, Corporations: the state publishes it at sos.mo.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Form LLC 4, foreign LLC: the state publishes it at sos.mo.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for RSMo 347.153, registration of foreign: the state publishes it at revisor.mo.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for RSMo 347.163, transacting business and: the state publishes it at revisor.mo.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Missouri Department of Revenue, business: the state publishes it at dor.mo.gov, confirmed October 2026, so you can look it up yourself
Mainstay Filing Missouri service page, read November 13, 2026
MO Registered Agent.org pricing page, read November 13, 2026
Missouri Registered Agent.co pricing page, read November 13, 2026