---
title: Add Companies To List
description: 
url: https://theirstack.com/en/docs/api-reference/company-lists/post_company_lists_add_companies_v0
---

## POST /v0/company\_lists/{list\_id}/add\_companies — Add Companies To List

### Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `list_id` | path | integer | Yes |  |

### Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `company_ids` | array<string> | No | Company IDs (encrypted slugs) to add to the list |
| `company_names` | array<string> | No | Company names to add to the list. Please don't use this filter anymore, use the \`company\_ids\` filter instead. |

### Responses

#### 200 — Successful Response

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `companies_count` | integer | No | Number of companies in the list Default: 0 |
| `created_at` | string | Yes |  |
| `deletable` | boolean | No | Whether the list can be deleted |
| `id` | integer | Yes |  |
| `name` | string | Yes | Name of the company list |
| `type` | enum(REVEALED\_COMPANIES, WEBHOOK\_TRIGGERED, MANUAL\_CREATION, EXPORT\_SNAPSHOT) | No | Type of the list: MANUAL\_CREATION, WEBHOOK\_TRIGGERED, REVEALED\_COMPANIES |
| `user_id` | integer | No | User ID of the list owner |
| `webhook_id` | integer | No | Webhook ID of the list |

#### 400 — Bad Request

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | Error | Yes |  |
| `request_id` | integer | No | The request id. This is useful to contact us to help you debug the issue. The request\_id won't be present in all errors. |

##### `error`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `code` | string | No | The error code. Eg: \`E-001\`, \`E-002\`, \`E-003\`, \`E-004\`, \`E-005\`, \`E-006\`, \`E-007\`, \`E-008\`, \`E-009\`, \`E-010\`, \`E-011\`, \`E-012\`, \`E-013\`, \`E-014\`, \`E-015\`, \`E-016\` |
| `description` | string | No | The error description |
| `title` | string | Yes | The error title. |

#### 402 — Payment Required

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | Error | Yes |  |
| `request_id` | integer | No | The request id. This is useful to contact us to help you debug the issue. The request\_id won't be present in all errors. |

##### `error`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `code` | string | No | The error code. Eg: \`E-001\`, \`E-002\`, \`E-003\`, \`E-004\`, \`E-005\`, \`E-006\`, \`E-007\`, \`E-008\`, \`E-009\`, \`E-010\`, \`E-011\`, \`E-012\`, \`E-013\`, \`E-014\`, \`E-015\`, \`E-016\` |
| `description` | string | No | The error description |
| `title` | string | Yes | The error title. |

#### 422 — Unprocessable Entity

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | Error | Yes |  |
| `request_id` | integer | No | The request id. This is useful to contact us to help you debug the issue. The request\_id won't be present in all errors. |

##### `error`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `code` | string | No | The error code. Eg: \`E-001\`, \`E-002\`, \`E-003\`, \`E-004\`, \`E-005\`, \`E-006\`, \`E-007\`, \`E-008\`, \`E-009\`, \`E-010\`, \`E-011\`, \`E-012\`, \`E-013\`, \`E-014\`, \`E-015\`, \`E-016\` |
| `description` | string | No | The error description |
| `title` | string | Yes | The error title. |

#### 500 — Internal Server Error

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | Error | Yes |  |
| `request_id` | integer | No | The request id. This is useful to contact us to help you debug the issue. The request\_id won't be present in all errors. |

##### `error`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `code` | string | No | The error code. Eg: \`E-001\`, \`E-002\`, \`E-003\`, \`E-004\`, \`E-005\`, \`E-006\`, \`E-007\`, \`E-008\`, \`E-009\`, \`E-010\`, \`E-011\`, \`E-012\`, \`E-013\`, \`E-014\`, \`E-015\`, \`E-016\` |
| `description` | string | No | The error description |
| `title` | string | Yes | The error title. |