Billionaire stock trades API: track insider buys and sells

What the SEC data covers

• Form 4 trades — every buy, sale, option exercise, grant, gift and tax withholding by company officers, directors and 10% owners, filed within two business days.
• Stakes — the shares each billionaire last reported, by company and by trust or LLC, valued at the latest market close.
• Form 144 — notices of planned sales, usually filed on or before the sale day.
• Schedule 13D/13G and 13F — 5%+ stakes and quarterly fund portfolios (see the 13F portfolio guide).

Get the latest billionaire trades

cURLcurl "https://billionairetracker.us/api/v1/trades?side=sell&minValue=1000000&limit=10" \
  -H "Authorization: Bearer YOUR_PRO_KEY"

JavaScriptconst res = await fetch('https://billionairetracker.us/api/v1/trades?side=sell&limit=10', {
  headers: { Authorization: 'Bearer ' + process.env.BT_API_KEY },
});
const { data } = await res.json();
for (const t of data) {
  console.log(t.transactionDate, t.people[0].name, t.side, t.shares, t.issuer.ticker, t.valueUsd);
}

Pythonimport os, requests

r = requests.get(
    "https://billionairetracker.us/api/v1/people/jensen-huang/trades",
    params={"side": "sell", "since": "2026-01-01"},
    headers={"Authorization": f"Bearer {os.environ['BT_API_KEY']}"},
)
body = r.json()
print(body["meta"]["totals"])          # buys, sells, boughtUsd, soldUsd, netUsd
for t in body["data"][:5]:
    print(t["transactionDate"], t["shares"], t["priceUsd"], t["url"])

Filters

Build a sell alert

Poll once an hour with a filing-date cursor and keep the ids you have already seen:

JavaScriptconst seen = new Set();
async function check() {
  const since = new Date(Date.now() - 3 * 86400e3).toISOString().slice(0, 10);
  const url = 'https://billionairetracker.us/api/v1/trades?side=sell&minValue=5000000&filedSince=' + since;
  const { data } = await (await fetch(url, { headers: { Authorization: 'Bearer ' + KEY } })).json();
  for (const t of data) {
    if (seen.has(t.id)) continue;
    seen.add(t.id);
    notify(`${t.people[0].name} sold ${t.issuer.ticker} worth $${(t.valueUsd / 1e6).toFixed(1)}M`, t.url);
  }
}
setInterval(check, 60 * 60 * 1000);

Transaction codes

Every trade keeps the SEC code and a plain-English label. The ones you will see most:

• P — Open-market or private purchase
• S — Open-market or private sale
• M — Option exercise or conversion of a derivative
• F — Shares withheld to pay tax or exercise price
• A — Grant or award from the company
• G — Gift
• C — Conversion of a derivative
• J — Other acquisition or disposition (see footnotes)

Stakes, planned sales and more

cURL# Reported stakes, valued at the latest close
curl https://billionairetracker.us/api/v1/people/elon-musk/holdings -H "Authorization: Bearer KEY"

# Planned sales (Form 144)
curl "https://billionairetracker.us/api/v1/planned-sales?person=jensen-huang" -H "Authorization: Bearer KEY"

# Who sold the most in the last 90 days
curl "https://billionairetracker.us/api/v1/insider-activity?days=90&sort=sold" -H "Authorization: Bearer KEY"

# Billionaires who own or trade a stock
curl https://billionairetracker.us/api/v1/stocks/NVDA -H "Authorization: Bearer KEY"

The latest large purchase in the data: Richard Kinder bought 500,000 KMI shares for $14.99 million on 2026-11-06.

Limits of SEC data

Form 4 covers insiders of US-listed companies only. A billionaire who leaves a board or drops below 10% stops filing, so their last reported stake is marked stale after a year. Private companies, foreign listings and personal brokerage accounts are not reported. Prices on Form 4 are often weighted averages across many trades in a day; the footnotes, included with every trade, give the range.

See the live data on billionaire stock trades, or get a Pro key on the developers page ($99/month).