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Plain CharterLLC questions, short answers.

Plain answers · Oklahoma

3 Best Foreign Registration Services in Oklahoma (2026), Plainly Answered

For foreign registration services in Oklahoma, our 2026 order is Mainstay Filing ($199), Oklahoma Registered Agent.co ($199) and OK Registered Agent.org ($199). The state's registration fee is $300 with any of them; service fees reach $397 to $497 over three years.

By the Plain Charter editorial team ·

Quick answer

Fee to register
$300
Home-state document?
Needed (60 days maximum age)
After registering
$25, annual certificate
Who to hire
Mainstay Filing, Oklahoma Registered Agent.co then OK Registered Agent.org

Oklahoma: our picks

The order follows our five criteria, led by cost and coverage.
1First choice

1. Mainstay Filing: best for LLCs adding states

First year $199, then $149 a year

Mainstay Filing leads our list: it costs $199 plus Oklahoma's fee, with a free first year of registered agent service and $149 a year after.

It costs $100 more than Oklahoma Registered Agent.co over three years; the difference buys one provider in every state.

There is no registered agent charge in year one; $149 a year follows.

The price covers

  • Registration, filed
  • Registered agent, free for year one
  • One price nationwide

Upsides

  • $199 plus Oklahoma's fee
  • Any state, one fee
  • First agent year free

What to weigh

  • Oklahoma Registered Agent.co renews the agent for $50 less
Visit Mainstay FilingPartner link. We may earn money if you buy.
2Oklahoma only

2. Oklahoma Registered Agent.co: best for one extra state

First year $199, then $99 a year

Pick number 2, Oklahoma Registered Agent.co, makes the list because three years of service fees come to $397.

The price covers

  • Your foreign filing
  • Agent service for year one

Upsides

  • Service fee $199
  • Low $99 renewal
  • Year-one agent included

What to weigh

  • Oklahoma only; the home state needs its own agent
Visit Oklahoma Registered Agent.coPartner link. We may earn money if you buy.
3Oklahoma only

3. OK Registered Agent.org: best for one extra state

First year $199, then $99 a year

Pick number 3, OK Registered Agent.org, makes the list because three years of service fees come to $397.

Oklahoma Registered Agent.co charges the same, so this one is a close second.

The price covers

  • Your foreign filing
  • Agent service for year one

Upsides

  • Low $99 renewal
  • Service fee $199
  • Year-one agent included

What to weigh

  • Oklahoma only; the home state needs its own agent
Visit OK Registered Agent.orgPartner link. We may earn money if you buy.

Compare at a glance

#ServiceYear 1RenewalOver three yearsIncludes
1Mainstay Filing$199$149/yr$497Registration, filed; registered agent, free for year one; one price nationwideVisit Mainstay FilingPartner link. We may earn money if you buy.
2Oklahoma Registered Agent.co$199$99/yr$397your foreign filing; agent service for year oneVisit Oklahoma Registered Agent.coPartner link. We may earn money if you buy.
3OK Registered Agent.org$199$99/yr$397your foreign filing; agent service for year oneVisit OK Registered Agent.orgPartner link. We may earn money if you buy.
Company prices on November 12, 2026, before state fees.

The plain answers

When does an out-of-state LLC have to register here?

If an LLC formed in another state does business in Oklahoma, it registers first.

Doing business unregistered risks the courts stay closed to its claims (18 O.S. 2048(A)).

oscn.net, confirmed October 2026

What will it cost to register?

The state charges $300; a service adds $199.

Over three years the state's fees reach $350, counting any recurring report. sos.ok.gov, confirmed October 2026

What is the application called?

What you file: the Application for Registration (Foreign Limited Liability Company) (SOS Form 0081). Where: the Oklahoma Secretary of State, Business Filing Department.

Include certificate of good standing, existence or fact dated within 60 days.

Is there a yearly filing?

$25 for the annual certificate.

When: anniversary of the registration date.

How did you rank them?

Mainstay Filing leads on what the price takes off your plate, which weighs 30% in our order.

Most of our weighting sits on three-year cost and what the price takes off your plate.

An out-of-state LLC is already in two states, and the first pick can serve both.

Read our criteria

Oklahoma requirements checklist

RuleDetailSource
Registration fee$300sos.ok.gov, confirmed October 2026
Home-state documentNeeded, 60 daysoscn.net, confirmed October 2026
Annual certificate$25oscn.net, confirmed October 2026
State total, years 1 to 3$350Total of these fees
We add the filing, two years of reports and any minimum tax for the three-year line. Publication and other variable costs are excluded.

Other quick questions

What about the home state?

The home state rules still apply there. A provider in every state, such as Mainstay Filing, can cover both.

What is the three-year cost of each?

Mainstay Filing $497, Oklahoma Registered Agent.co $397 and OK Registered Agent.org $397 (service fees only).

Are the fees official?

State fees from Oklahoma's official sources, cited next to each figure; service prices from each company's own pricing.

Do I have to use a service?

No, you can file yourself if you meet the rules on this page.

Can someone else file the registration?

Any of the picks can file it for you at the same state fee.

Who is your first choice in Oklahoma?

Mainstay Filing tops our list because you pay $199 to register and nothing for the registered agent until year two; Oklahoma Registered Agent.co and OK Registered Agent.org come next.

Sources

  1. Oklahoma Secretary of State, Business: sos.ok.gov (August 2026)
  2. Oklahoma Secretary of State, Business: sos.ok.gov (August 2026)
  3. Oklahoma report due date: law.justia.com (August 2026)
  4. 18 O.S. § 2004: sos.ok.gov (August 2026)
  5. Oklahoma formation fee: Filing fee: sos.ok.gov (October 2026)
  6. Procedures for registering a foreign: sos.ok.gov (October 2026)
  7. 18 O.S. § 2049, transacting: oscn.net (October 2026)
  8. Oklahoma Statutes Title 18, foreign: oklegislature.gov (November 2026)
  9. Prices from the Mainstay Filing Oklahoma service page on November 12, 2026
  10. Prices from the Oklahoma Registered Agent.co pricing page on November 12, 2026
  11. Prices from the OK Registered Agent.org pricing page on November 12, 2026