Form 144 API reference | SecFeed for developers

Endpoints

/v1/form-144

GEThttps://secfeedapi.com/v1/form-144

Proposed sales of restricted and control securities: flat fields (seller, relationship, shares, market value, broker, sale date, past 3 months of sales).

Parameter	Type	Description	Example
`cik`	integer	CIK of the filer, which on Form 144 is usually the person selling, not the issuer.	`1870974`
`startDate`	string	Earliest filing date, YYYY-MM-DD.	`2026-10-01`
`endDate`	string	Latest filing date, YYYY-MM-DD.	`2026-10-09`
`formType`	string	144 or 144/A.	`144`
`flat.<field>`	string or number	Exact match on a flat field, or flat.<field>__gte / __lte for numeric ranges.	`flat.aggregateMarketValue__gte=1000000`
`data.<path>`	string	Exact match on any value in the original XML, by dotted path.	`data.primary_doc.formData.issuerInfo.issuerCik=0001045810`
`fields`	string	Set to flat to drop the full XML and return only the flat fields.	`flat`
`from`	integer	Offset for paging. Default `0`.	`20`
`size`	integer	Filings per page, up to 100. Default `20`.	`20`

To filter by issuer, use data.primary_doc.formData.issuerInfo.issuerCik with the 10 digit zero padded CIK, or flat.issuerName with the exact name.

Request examples

Every response below is real output from the API, trimmed to the first records.

Latest notices, flat fields only

fields=flat keeps the response small; drop it to get the full filing under data.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?fields=flat&size=2"

import os, requests

r = requests.get(
    "https://secfeedapi.com/v1/form-144",
    params={'fields': 'flat', 'size': '2'},
    headers={"Authorization": f"Bearer {os.environ['SECFEED_KEY']}"},
    timeout=60,
)
r.raise_for_status()
print(r.json())

{
  "total": 2629,
  "filings": [
    {
      "accessionNo": "0001921094-26-001086",
      "formType": "144",
      "filedAt": "2026-10-13",
      "cik": 1870974,
      "companyName": "Ghamsari Nima",
      "flat": {
        "issuerCik": "1855747",
        "issuerName": "Blend Labs, Inc.",
        "seller": "Ghamsari Nima",
        "relationship": [
          "Officer",
          "Director"
        ],
        "securityClass": "Common",
        "broker": "Charles Schwab & Co., Inc.",
        "sharesToSell": 25098.0,
        "aggregateMarketValue": 24474.0,
        "sharesOutstanding": 233256934.0,
        "approxSaleDate": "10/12/2026",
        "exchange": "NYSE",
        "acquiredDate": "11/20/2025",
        "natureOfAcquisition": "Restricted Stock Lapse",
        "acquiredFrom": "BLEND LABS, INC.",
        "isGift": false,
        "salesPast3Months": [
          {
            "seller": "NIMA GHAMSARI",
            "saleDate": "09/14/2026",
            "shares": 17731.0,
            "grossProceeds": 25267.0
          },
          {
            "seller": "NIMA GHAMSARI",
            "saleDate": "09/21/2026",
            "shares": 21009.0,
            "grossProceeds": 25024.0
          }
        ],
        "planAdoptionDates": [
          "06/15/2026"
        ]
      }
    },
    {
      "accessionNo": "0001921094-26-001085",
      "formType": "144",
      "filedAt": "2026-10-13",
      "cik": 1830016,
      "companyName": "Nonko Eugene",
      "flat": {
        "issuerCik": "1818383",
        "issuerName": "MediaAlpha, Inc.",
        "seller": "Nonko Eugene",
        "relationship": [
          "Director"
        ],
  ...

Planned sales worth over $1 million

aggregateMarketValue is the seller's estimate at filing time.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?flat.aggregateMarketValue__gte=1000000&fields=flat&size=2"

import os, requests

r = requests.get(
    "https://secfeedapi.com/v1/form-144",
    params={'flat.aggregateMarketValue__gte': '1000000', 'fields': 'flat', 'size': '2'},
    headers={"Authorization": f"Bearer {os.environ['SECFEED_KEY']}"},
    timeout=60,
)
r.raise_for_status()
print(r.json())

{
  "total": 858,
  "filings": [
    {
      "accessionNo": "0001921094-26-001084",
      "formType": "144",
      "filedAt": "2026-10-13",
      "cik": 1564475,
      "companyName": "Olivan Javier",
      "flat": {
        "issuerCik": "1326801",
        "issuerName": "Meta Platforms, Inc.",
        "seller": "Olivan Javier",
        "relationship": [
          "Officer"
        ],
        "securityClass": "Class A Common Shares",
        "broker": "Charles Schwab & Co., Inc.",
        "sharesToSell": 1575.0,
        "aggregateMarketValue": 1146757.0,
        "sharesOutstanding": 2205128509.0,
        "approxSaleDate": "10/12/2026",
        "exchange": "NASDAQ",
        "acquiredDate": "02/15/2017",
        "natureOfAcquisition": "Restricted Stock Unit Lapse",
        "acquiredFrom": "Meta Platforms, Inc.",
        "isGift": false,
        "salesPast3Months": [
          {
            "seller": "JAVIER OLIVAN",
            "saleDate": "07/13/2026",
            "shares": 2163.0,
            "grossProceeds": 1429787.0
          },
          {
            "seller": "JAVIER OLIVAN",
            "saleDate": "07/20/2026",
            "shares": 1466.0,
            "grossProceeds": 946816.0
          }
        ],
        "planAdoptionDates": [
          "11/17/2025"
        ]
      }
    },
    {
      "accessionNo": "0001958244-26-000656",
      "formType": "144",
      "filedAt": "2026-10-13",
      "cik": 1754844,
      "companyName": "CMXI B.V.",
      "flat": {
        "issuerCik": "1707753",
        "issuerName": "Elastic N.V.",
        "seller": "CMXI B.V.",
        "relationship": [
          "Director"
        ],
        "securityClass": "Ordinary",
  ...

Notices filed in a date range

Dates filter on the filing date.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?startDate=2026-10-01&endDate=2026-10-09&fields=flat&size=1"

import os, requests

r = requests.get(
    "https://secfeedapi.com/v1/form-144",
    params={'startDate': '2026-10-01', 'endDate': '2026-10-09', 'fields': 'flat', 'size': '1'},
    headers={"Authorization": f"Bearer {os.environ['SECFEED_KEY']}"},
    timeout=60,
)
r.raise_for_status()
print(r.json())

{
  "total": 634,
  "filings": [
    {
      "accessionNo": "0001950047-26-010150",
      "formType": "144",
      "filedAt": "2026-10-09",
      "cik": 938071,
      "companyName": "DUFFIELD DAVID A",
      "flat": {
        "issuerCik": "1327811",
        "issuerName": "WORKDAY, INC.",
        "seller": "DAVID A. DUFFIELD TRUST U/T/A 7/14/88",
        "relationship": [
          "10% Stockholder"
        ],
        "securityClass": "Common",
        "broker": "Morgan Stanley Smith Barney LLC Executive Financial Services",
        "sharesToSell": 99835.0,
        "aggregateMarketValue": 18750011.35,
        "sharesOutstanding": 196000000.0,
        "approxSaleDate": "10/09/2026",
        "exchange": "NASDAQ",
        "acquiredDate": "12/27/2007",
        "natureOfAcquisition": "Private Placement",
        "acquiredFrom": "Issuer",
        "isGift": false,
        "salesPast3Months": [
          {
            "seller": "10b5-1 Sales for DAVID A DUFFIELD TRUST U/T/A 7/14/88",
            "saleDate": "10/06/2026",
            "shares": 99228.0,
            "grossProceeds": 18587111.12
          },
          {
            "seller": "10b5-1 Sales for DAVID A DUFFIELD TRUST U/T/A 7/14/88",
            "saleDate": "10/01/2026",
            "shares": 98446.0,
            "grossProceeds": 18415820.68
          }
        ],
        "planAdoptionDates": [
          "12/02/2025"
        ]
      }
    }
  ]
}

Response fields

Field	Type	Meaning
`total`	integer	Matching filings.
`filings[].accessionNo`	string	Accession number.
`filings[].formType`	string	144 or 144/A.
`filings[].filedAt`	string	Filing date.
`filings[].cik / companyName`	mixed	Filer CIK and name (usually the seller).
`filings[].flat.issuerCik / issuerName`	string	Company whose stock will be sold.
`filings[].flat.seller`	string	Person for whose account the shares are sold.
`filings[].flat.relationship[]`	array	Officer, Director, 10% owner and so on.
`filings[].flat.securityClass`	string	Class of security.
`filings[].flat.broker / exchange`	string	Broker handling the sale and the exchange.
`filings[].flat.sharesToSell`	number	Shares to be sold.
`filings[].flat.aggregateMarketValue`	number	Market value of those shares.
`filings[].flat.sharesOutstanding`	number	Issuer shares outstanding.
`filings[].flat.approxSaleDate`	string	Expected sale date, MM/DD/YYYY.
`filings[].flat.acquiredDate / natureOfAcquisition / acquiredFrom`	string	How and when the shares were acquired.
`filings[].flat.isGift`	boolean	The shares were received as a gift.
`filings[].flat.salesPast3Months[].seller / saleDate / shares / grossProceeds`	mixed	Sales by the same seller in the prior three months.
`filings[].flat.planAdoptionDates[]`	array	10b5-1 plan adoption dates when reported.
`filings[].data.primary_doc.headerData`	object	Submission header (filer CIK, live or test).
`filings[].data.primary_doc.formData.issuerInfo`	object	Issuer CIK, name, file number, address, phone, seller name, relationships.
`filings[].data.primary_doc.formData.securitiesInformation`	object	Class, broker with address, units to sell, market value, units outstanding, sale date, exchange.
`filings[].data.primary_doc.formData.securitiesToBeSold`	object	Acquisition date, nature, source, gift flag, amount, payment date and nature.
`filings[].data.primary_doc.formData.securitiesSoldInPast3Months[]`	array	Seller details, class, sale date, amount sold, gross proceeds.
`filings[].data.primary_doc.formData.nothingToReportFlagOnSecuritiesSoldInPast3Months`	string	Y when there were no sales in the prior three months.
`filings[].data.primary_doc.formData.remarks`	string	Free text remarks.
`filings[].data.primary_doc.formData.noticeSignature`	object	Notice date, plan adoption dates and signature.

How to

How do I see Form 144 notices for one issuer?

Filter on the issuer CIK inside the XML. It is 10 digits with leading zeros.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?data.primary_doc.formData.issuerInfo.issuerCik=0001045810&fields=flat&size=1"

How do I find Form 144 notices handled by one broker?

Match flat.broker exactly, URL encoded.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?flat.broker=Morgan%2520Stanley%2520Smith%2520Barney%2520LLC&fields=flat&size=1"

How do I see amended Form 144 notices?

Set formType=144/A.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?formType=144/A&fields=flat&size=1"

How do I filter by the filer?

cik is the filer's CIK, which for Form 144 is usually the selling person.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?cik=1870974&fields=flat&size=1"

How do I find notices where the shares were a gift?

Filter the original field isGiftTransaction=Y with a data. filter.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?data.primary_doc.formData.securitiesToBeSold.isGiftTransaction=Y&fields=flat&size=1"

How do I filter by issuer name?

Use flat.issuerName with the exact name as filed, URL encoded.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?flat.issuerName=NVIDIA%2520CORP&fields=flat&size=1"

How do I get the complete filing?

Leave out fields=flat; the full XML as JSON is under data.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?size=1"

How do I see recent sales by the same seller?

Read flat.salesPast3Months; each entry has the sale date, shares and gross proceeds.

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/form-144?fields=flat&size=2"

Errors

Form 144 flat filters on numeric looking text (issuerCik) and on true/false fields (isGift) currently match nothing; use data.<path> for those.

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