<!-- Part of the official Carta AI Agent Plugin -->

409A Valuation History

Fetch 409A fair market value (FMV) history for a company.

When to Use

• "What's the current 409A valuation?"
• "Show me the FMV history"
• "When does the 409A expire?"
• "What's the exercise price for common stock?"
• "Has the FMV changed recently?"
• "Is the 409A valuation still valid?"

Prerequisites

You need the corporation_id. Get it from list_accounts if you don't have it.

Data Retrieval

call_tool({"name": "cap_table__get__409a_valuations", "arguments": {"corporation_id": corporation_id}})

Optional params:

• share_class_id: filter to a specific share class
• report_id: filter to a specific valuation report

Response Format

JSON array of FMV records:

[
  {
    "id": 484,
    "effective_date": "04/25/2024",
    "expiration_date": "04/24/2025",
    "stale_date": null,
    "price": "12.610000000000",
    "report_id": 472,
    "share_class_id": 9,
    "name": "Common",
    "common": true,
    "corporation_id": 7
  }
]

Key Fields

• effective_date: date the 409A valuation became effective
• expiration_date: date the valuation expires (typically 1 year after effective)
• stale_date: date after which the valuation is considered stale (if applicable)
• price: FMV per share as a string (e.g. "12.610000000000")
• name: share class name (e.g. "Common")
• common: true if this is the common stock FMV
• report_id: ID of the 409A report
• share_class_id: ID of the share class

Workflow

Step 1 — Fetch Valuations

call_tool({"name": "cap_table__get__409a_valuations", "arguments": {"corporation_id": corporation_id}})

Step 2 — Identify Current Valuation

Sort by effective_date descending. The most recent entry is the current 409A — highlight it.

Step 3 — Check Expiration

• If expiration_date is within 90 days of today — flag as a time-sensitive action item, not just a data point: bold it, call out the exact days remaining, and recommend initiating renewal immediately (especially if a financing round is in progress, as closing will likely push past the expiry date).
• If expiration_date is in the past — flag as "expired".

Step 4 — Present Results

Show the history table and trend summary (see Presentation section).

Gates

Required inputs: corporation_id. If missing, call AskUserQuestion before proceeding (see carta-interaction-reference §4.1).

AI computation: No — this skill presents Carta data directly.

Presentation

Format: Table + trend summary

BLUF lead: Lead with the current FMV per share and its effective/expiration dates before showing the history table.

Sort order: By effective_date descending (most recent first).

Date format: MMM d, yyyy (e.g. "Jan 15, 2026").

Format price as currency (e.g. "$12.61/share"), trimming trailing zeros.

Effective	Expires	FMV/Share	Share Class	Status
Apr 25, 2024	Apr 24, 2025	$12.61	Common	Current
Mar 31, 2023	Apr 24, 2024	$10.33	Common	Expired

Do not render a bar chart for FMV history — values in mature companies cluster near the maximum, making bars uninformative (all bars look the same width). The table is sufficient. Instead, after the table, add a one-line trend summary:

FMV has grown Nx since YYYY, with [acceleration/steady growth] since [year].

If multiple share classes exist, group by share class name in the table.

Caveats

• The price field is a string with many trailing zeros — always parse and format as currency before displaying.
• A valuation with a past expiration_date should never be used for new grant pricing. Flag it prominently.
• The stale_date field may be null; when present, it indicates the valuation is considered stale before its formal expiration.
• 409A valuations are point-in-time snapshots — a material event (e.g., new financing round) can invalidate the current valuation even before its expiration date.