Execute a share repurchase

Last updated Jun 14, 2026

Query Parameters

dry_runbooleanOptional

If true, simulate the mutation and return the would-be resource, any cascaded resources, and a fee estimate — without side effects. Available on every mutation.

Default false

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

grant_idstringRequired

shares_to_repurchaseintegerRequired

Number of shares to cancel and repurchase. Must not exceed the grant's still-unrepurchased balance.

repurchase_price_per_share_centsintegerRequired

Per-share consideration in cents. Typically par value (often 1 for $0.0001 par stock paid at issuance) for pre_cliff_unvested_cancellation; latest 409A FMV for post_cliff_at_fmv; whatever the authorising resolution names for board_authorized_other.

repurchase_kindstringRequired

Categorises the repurchase for downstream tax and audit treatment. pre_cliff_unvested_cancellation cancels at par back to the unissued pool. post_cliff_at_fmv repurchases vested or unvested shares at FMV from the latest Valuation. board_authorized_other covers any other repurchase the board specifically authorises (e.g. ROFR exercise on departing cofounder vested shares).

One of"pre_cliff_unvested_cancellation""post_cliff_at_fmv""board_authorized_other"

authorizing_resolution_idstringRequired

Required. The passed Resolution that authorises the repurchase and names the price.

effective_datestring<date>Optional

Effective date of the repurchase. Defaults to today.

Format date

metadataobjectOptional

Flat string-to-string map. Up to 50 keys. Keys: max 40 chars, charset [A-Za-z0-9_\\-.]. Values: max 500 chars. Keys prefixed matter_ are reserved for platform use. Metadata is retrievable but not filterable via query params.

Response Body

`application/json`

`application/problem+json`

Request

curl -X POST "https://api.mattermode.com/v1/entities/{id}/share_repurchase" \  -H "Content-Type: application/json" \  -d '{    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"  }'

const body = JSON.stringify({  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"})fetch("https://api.mattermode.com/v1/entities/{id}/share_repurchase", {  method: "POST",  headers: {    "Content-Type": "application/json"  },  body})

package mainimport (  "fmt"  "net/http"  "io/ioutil"  "strings")func main() {  url := "https://api.mattermode.com/v1/entities/{id}/share_repurchase"  body := strings.NewReader(`{    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"  }`)  req, _ := http.NewRequest("POST", url, body)  req.Header.Add("Content-Type", "application/json")  res, _ := http.DefaultClient.Do(req)  defer res.Body.Close()  body, _ := ioutil.ReadAll(res.Body)  fmt.Println(res)  fmt.Println(string(body))}

import requestsheaders = {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",}payload = {    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"}resp = requests.post(    "https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/share_repurchase",    headers=headers,    json=payload,)resp.raise_for_status()print(resp.json())

import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.net.http.HttpResponse.BodyHandlers;import java.time.Duration;import java.net.http.HttpRequest.BodyPublishers;var body = BodyPublishers.ofString("""{  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"}""");HttpClient client = HttpClient.newBuilder()  .connectTimeout(Duration.ofSeconds(10))  .build();HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()  .uri(URI.create("https://api.mattermode.com/v1/entities/{id}/share_repurchase"))  .header("Content-Type", "application/json")  .POST(body)  .build();try {  HttpResponse<String> response = client.send(requestBuilder.build(), BodyHandlers.ofString());  System.out.println("Status code: " + response.statusCode());  System.out.println("Response body: " + response.body());} catch (Exception e) {  e.printStackTrace();}

using System;using System.Net.Http;using System.Text;var body = new StringContent("""{  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"}""", Encoding.UTF8, "application/json");var client = new HttpClient();var response = await client.PostAsync("https://api.mattermode.com/v1/entities/{id}/share_repurchase", body);var responseBody = await response.Content.ReadAsStringAsync();

curl --request POST 'https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/share_repurchase' \  --header 'Authorization: Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc' \  --header 'Matter-Version: 2026-06-10' \  --header 'Idempotency-Key: ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b' \  --header 'Content-Type: application/json' \  --data '{  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"}'

const response = await fetch("https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/share_repurchase", {  method: "POST",  headers: {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",    "Content-Type": "application/json",  },  body: JSON.stringify({    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"  }),});if (!response.ok) {  throw new Error(`Matter API ${response.status}: ${await response.text()}`);}const data = await response.json();console.log(data);

Response

application/json

{
  "object": "share_repurchase_dispatch",
  "id": "sre_8mY3pQrL",
  "status": "executed",
  "grant_id": "grt_C0F0und3rB",
  "shares_repurchased": 3000000,
  "cancelled_share_ledger_entry_id": "led_Cancel001",
  "repurchase_payment_ledger_entry_id": "led_Pay001",
  "cap_table_amendment_id": "cta_NewRoster",
  "authorizing_resolution_id": "res_LqGcSdRb",
  "effective_date": "2026-04-15",
  "events_emitted": [
    "evt_repurchase_executed",
    "evt_cap_table_amended"
  ]
}

{
  "type": "https://mattermode.com/docs/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "code": "invalid_request",
  "detail": "Request body could not be parsed as JSON.",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_request",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/authentication_required",
  "title": "Authentication required",
  "status": 401,
  "code": "authentication_required",
  "detail": "No bearer token was supplied. Pass `Authorization: Bearer sk_live_...` on every request.",
  "doc_url": "https://mattermode.com/docs/guides/errors#authentication_required",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/invalid_state_transition",
  "title": "Invalid state transition",
  "status": 409,
  "detail": "Entity ent_Nq3KcAbc is in state `dissolved` and cannot be dissolved again.",
  "instance": "/requests/req_Qw9xYz8A",
  "code": "invalid_state_transition",
  "param": "founders[0].equity",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30,
  "authorized_by": {
    "human_principal_id": "usr_4Kj2m8pQ",
    "agent_id": "agt_Nq3KcAbc"
  }
}

{
  "type": "https://mattermode.com/docs/errors/invalid_state_transition",
  "title": "Invalid state transition",
  "status": 409,
  "detail": "Entity ent_Nq3KcAbc is in state `dissolved` and cannot be dissolved again.",
  "instance": "/requests/req_Qw9xYz8A",
  "code": "invalid_state_transition",
  "param": "founders[0].equity",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30,
  "authorized_by": {
    "human_principal_id": "usr_4Kj2m8pQ",
    "agent_id": "agt_Nq3KcAbc"
  }
}

{
  "type": "https://mattermode.com/docs/errors/rate_limit_exceeded",
  "title": "Rate limit exceeded",
  "status": 429,
  "code": "rate_limit_exceeded",
  "detail": "Request rate exceeded for this key. Retry after `retry_after` seconds or honor the `Retry-After` header.",
  "doc_url": "https://mattermode.com/docs/guides/errors#rate_limit_exceeded",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30
}

Execute the share repurchase.

The 5th composite atomic flow, joining formation_packet, close_package, the MFN cascade, and the dissolution cascade. One call cancels the targeted shares back to the authorised-but-unissued pool, records the repurchase consideration on the share ledger, and amends the cap table — all atomically. Either all three ledger writes land (share_repurchase_cancellation, share_repurchase_payment, and the cap_table.amendment) or none does.

Used by the cofounder-departure cascade to repurchase pre-cliff unvested shares at par (pre_cliff_unvested_cancellation), post-cliff unvested shares at FMV (post_cliff_at_fmv), and any board-authorised buyback (board_authorized_other). The authorizing_resolution_id is required — it must reference a passed Resolution of kind: amend_founder_grants (or equivalent buyback authorisation) that names the per-share price.

Returns 202 Accepted. On completion, emits share_repurchase.executed, cap_table.amended, and share_ledger.entry_recorded × 2. Subscribe via `POST /v1/webhook_endpoints`. Idempotent via Idempotency-Key. See the cofounder-departure cookbook Phase 3 for the full walkthrough.

Last updated Jun 14, 2026

Query Parameters

dry_runbooleanOptional

If true, simulate the mutation and return the would-be resource, any cascaded resources, and a fee estimate — without side effects. Available on every mutation.

Default false

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

grant_idstringRequired

shares_to_repurchaseintegerRequired

Number of shares to cancel and repurchase. Must not exceed the grant's still-unrepurchased balance.

repurchase_price_per_share_centsintegerRequired

repurchase_kindstringRequired

One of"pre_cliff_unvested_cancellation""post_cliff_at_fmv""board_authorized_other"

authorizing_resolution_idstringRequired

Required. The passed Resolution that authorises the repurchase and names the price.

effective_datestring<date>Optional

Effective date of the repurchase. Defaults to today.

Format date

metadataobjectOptional

Response Body

`application/json`

`application/problem+json`

Request

curl -X POST "https://api.mattermode.com/v1/entities/{id}/share_repurchase" \  -H "Content-Type: application/json" \  -d '{    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"  }'

const body = JSON.stringify({  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"})fetch("https://api.mattermode.com/v1/entities/{id}/share_repurchase", {  method: "POST",  headers: {    "Content-Type": "application/json"  },  body})

package mainimport (  "fmt"  "net/http"  "io/ioutil"  "strings")func main() {  url := "https://api.mattermode.com/v1/entities/{id}/share_repurchase"  body := strings.NewReader(`{    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"  }`)  req, _ := http.NewRequest("POST", url, body)  req.Header.Add("Content-Type", "application/json")  res, _ := http.DefaultClient.Do(req)  defer res.Body.Close()  body, _ := ioutil.ReadAll(res.Body)  fmt.Println(res)  fmt.Println(string(body))}

import requestsheaders = {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",}payload = {    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"}resp = requests.post(    "https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/share_repurchase",    headers=headers,    json=payload,)resp.raise_for_status()print(resp.json())

import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.net.http.HttpResponse.BodyHandlers;import java.time.Duration;import java.net.http.HttpRequest.BodyPublishers;var body = BodyPublishers.ofString("""{  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"}""");HttpClient client = HttpClient.newBuilder()  .connectTimeout(Duration.ofSeconds(10))  .build();HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()  .uri(URI.create("https://api.mattermode.com/v1/entities/{id}/share_repurchase"))  .header("Content-Type", "application/json")  .POST(body)  .build();try {  HttpResponse<String> response = client.send(requestBuilder.build(), BodyHandlers.ofString());  System.out.println("Status code: " + response.statusCode());  System.out.println("Response body: " + response.body());} catch (Exception e) {  e.printStackTrace();}

using System;using System.Net.Http;using System.Text;var body = new StringContent("""{  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"}""", Encoding.UTF8, "application/json");var client = new HttpClient();var response = await client.PostAsync("https://api.mattermode.com/v1/entities/{id}/share_repurchase", body);var responseBody = await response.Content.ReadAsStringAsync();

curl --request POST 'https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/share_repurchase' \  --header 'Authorization: Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc' \  --header 'Matter-Version: 2026-06-10' \  --header 'Idempotency-Key: ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b' \  --header 'Content-Type: application/json' \  --data '{  "grant_id": "grt_C0F0und3rB",  "shares_to_repurchase": 3000000,  "repurchase_price_per_share_cents": 1,  "repurchase_kind": "pre_cliff_unvested_cancellation",  "authorizing_resolution_id": "res_LqGcSdRb",  "effective_date": "2026-04-15"}'

const response = await fetch("https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/share_repurchase", {  method: "POST",  headers: {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",    "Idempotency-Key": "ee7c3a9b-3f1a-4d8e-9b2a-7c5e1f0a2d4b",    "Content-Type": "application/json",  },  body: JSON.stringify({    "grant_id": "grt_C0F0und3rB",    "shares_to_repurchase": 3000000,    "repurchase_price_per_share_cents": 1,    "repurchase_kind": "pre_cliff_unvested_cancellation",    "authorizing_resolution_id": "res_LqGcSdRb",    "effective_date": "2026-04-15"  }),});if (!response.ok) {  throw new Error(`Matter API ${response.status}: ${await response.text()}`);}const data = await response.json();console.log(data);

Response

application/json

{
  "object": "share_repurchase_dispatch",
  "id": "sre_8mY3pQrL",
  "status": "executed",
  "grant_id": "grt_C0F0und3rB",
  "shares_repurchased": 3000000,
  "cancelled_share_ledger_entry_id": "led_Cancel001",
  "repurchase_payment_ledger_entry_id": "led_Pay001",
  "cap_table_amendment_id": "cta_NewRoster",
  "authorizing_resolution_id": "res_LqGcSdRb",
  "effective_date": "2026-04-15",
  "events_emitted": [
    "evt_repurchase_executed",
    "evt_cap_table_amended"
  ]
}

{
  "type": "https://mattermode.com/docs/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "code": "invalid_request",
  "detail": "Request body could not be parsed as JSON.",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_request",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/authentication_required",
  "title": "Authentication required",
  "status": 401,
  "code": "authentication_required",
  "detail": "No bearer token was supplied. Pass `Authorization: Bearer sk_live_...` on every request.",
  "doc_url": "https://mattermode.com/docs/guides/errors#authentication_required",
  "request_id": "req_Qw9xYz8A"
}

{
  "type": "https://mattermode.com/docs/errors/invalid_state_transition",
  "title": "Invalid state transition",
  "status": 409,
  "detail": "Entity ent_Nq3KcAbc is in state `dissolved` and cannot be dissolved again.",
  "instance": "/requests/req_Qw9xYz8A",
  "code": "invalid_state_transition",
  "param": "founders[0].equity",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30,
  "authorized_by": {
    "human_principal_id": "usr_4Kj2m8pQ",
    "agent_id": "agt_Nq3KcAbc"
  }
}

{
  "type": "https://mattermode.com/docs/errors/invalid_state_transition",
  "title": "Invalid state transition",
  "status": 409,
  "detail": "Entity ent_Nq3KcAbc is in state `dissolved` and cannot be dissolved again.",
  "instance": "/requests/req_Qw9xYz8A",
  "code": "invalid_state_transition",
  "param": "founders[0].equity",
  "doc_url": "https://mattermode.com/docs/guides/errors#invalid_state_transition",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30,
  "authorized_by": {
    "human_principal_id": "usr_4Kj2m8pQ",
    "agent_id": "agt_Nq3KcAbc"
  }
}

{
  "type": "https://mattermode.com/docs/errors/rate_limit_exceeded",
  "title": "Rate limit exceeded",
  "status": 429,
  "code": "rate_limit_exceeded",
  "detail": "Request rate exceeded for this key. Retry after `retry_after` seconds or honor the `Retry-After` header.",
  "doc_url": "https://mattermode.com/docs/guides/errors#rate_limit_exceeded",
  "request_id": "req_Qw9xYz8A",
  "retry_after": 30
}

Execute the share repurchase.

Query Parameters

Request Body

Response Body

202application/json

400application/problem+json

401application/problem+json

409application/problem+json

412application/problem+json

429application/problem+json

Execute the share repurchase.

Query Parameters

Request Body

Response Body

202application/json

400application/problem+json

401application/problem+json

409application/problem+json

412application/problem+json

429application/problem+json

`application/json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`

`application/problem+json`