ChatGPT Plugin

Codon Valuation

409A and EMI value estimates

Brand: Unknown

Category: Pending
Primary Subcategory: Pending

Integration details

Description

Codon Valuation estimates the value of a private company's common stock (US) or ordinary shares (UK) before a formal valuation. Give it the company's cap table and finances, such as share counts by class, the last priced round, revenue, cash and debt, and it returns an indicative low, mid and high value per share with the method and every assumption shown. The method follows what the company provides: an option pricing model calibrated to a recent priced round, a roll-forward of an older round blended with a revenue multiple, a sector revenue multiple, or an asset-based range for pre-revenue companies. Value is allocated across share classes with a Black-Scholes option pricing model, then a discount for lack of marketability is applied using the Finnerty and Chaffe models. It also explains the documents and process for a formal IRC 409A valuation or an HMRC EMI valuation. All tools are read-only. Nothing is stored, no account is needed, and the tools do not ask for names or other personal information. Results are indicative planning estimates: they are not a 409A valuation, do not provide safe harbor protection, and are not a valuation agreed with HMRC.

Integration type: Plugin
Verification status: Not applicable
Platform: ChatGPT
Category: Pending
Primary Subcategory: Pending
Secondary Subcategories: None listed
Brand: Unknown
Access: No account required
First tracked: 2026-10-21
Tool count: 3
Geography: US

Agent DiscoverabilityChatGPT Plugin Discovery Score

ChatGPT organic discovery is live

Your score is coming

ChatGPT now suggests Plugins on its own when they match a user's request.Your Plugin Discovery Score measures how often yours appears, and it will show here as soon as it’s ready.

Sign up to track your Plugin See who ChatGPT suggests

ChatGPT recommends Airtable when a user asks it to update a CRM. — ChatGPT surfaces Airtable because it matches the user's request.

Primary Subcategory

Competitive lineup

No Primary Subcategory assigned yetOnce Codon Valuation has a Primary Subcategory, the Plugins and Connectors it competes with will appear here with their scores.

Tools

3 tools agents can invoke

Gives an indicative range for the fair market value per share of a US private company's common stock, as a planning estimate before a formal 409A valuation (for example, to anticipate an option strike price). Uses an option pricing model backsolve when there is a priced round in the last 12 months; otherwise a rolled-forward round, a sector revenue multiple, or an asset-based approach, depending on the inputs. Applies Finnerty and Chaffe marketability discounts. Inputs are numbers from the cap table and financials; no company or personal names are needed. Limitations: treats all preferred as non-participating and pari passu with 1:1 conversion, and does not model SAFEs or convertible notes. The result is not a 409A valuation.
estimate_409a_value
Gives an indicative range for the market value per ordinary share of a UK private company, as a planning estimate before agreeing an EMI valuation with HMRC (for example, to anticipate an EMI option exercise price). Uses the same methods as the 409A estimate, in pounds sterling: an option pricing model backsolve for a priced round in the last 12 months, otherwise a rolled-forward round, a sector revenue multiple, or an asset-based approach. Inputs are numbers from the shareholder register and accounts; no company or personal names are needed. Limitations: treats all preference shares as non-participating and pari passu, and does not model convertible instruments. The result is not an HMRC-agreed valuation.
estimate_emi_share_value
Lists the documents and typical steps for a formal US 409A valuation or UK EMI valuation, with contact details for Codon Valuation Advisors, the firm that provides this connector. Use when the user asks what a formal valuation requires or how to obtain one.
get_formal_valuation_info

FAQs

Codon Valuation ChatGPT Plugin FAQ

How the directory, categories and Discoverability Score work.

Read the methodology

How do I improve Codon Valuation's ChatGPT Plugin discoverability?

The levers are the listing surface agents actually read: names, descriptions, keywords, tool metadata, and registry health. Which lever matters depends on where discovery breaks, which is what continuous measurement shows.

Where is this profile measured?

This profile uses the geography attached to the latest public registry snapshot: US. Locale tags are intentionally omitted.