SEC Form 4
Centene Corporation (CNC) insider trading
In the 12 months to Oct 23, 2026, 2 CNC insiders reported open-market sales of $14.6M across 4 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $14.6M
- 4 filings · 2 insiders
- Open-market purchases
- $0
- 0 filings
Who traded CNC, and when
- Sale
CNC daily close from Oct 23, 2025 to Oct 22, 2026, between $31.80 and $71.24, last $71.24. 4 sale and 0 purchase filings by 2 insiders, marked at their filing dates. Kenneth A. Burdick, Director: sold $7.7M across 2 filings, first filed Dec 5, 2025, last Jun 11, 2026. Christopher Koster, Secretary & General Counsel: sold $6.9M across 2 filings, first filed Aug 19, 2026, last Aug 27, 2026.
Largest mark · tap a row for others
Kenneth A. Burdick · Director
Sale $5,164,000
80,000 shares at $64.55 avg
Filed Jun 11, 2026 · traded Jun 10
Close on filing date $63.54
Kenneth A. Burdick · Director
Director
$7.7M soldChristopher Koster · Secretary & General Counsel
Secretary & General Counsel
$6.9M soldHas the Centene Corporation's CEO sold stock?
No. Sarah London (CEO) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
4 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Kenneth A. Burdick | Director | $7.7M | — | 2 | — | |
| Christopher Koster | Secretary & General Counsel | $6.9M | — | 2 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Christopher Koster Secretary & General Counsel | Sale | 56,500 | $66.90 | $3.8M | 248,854 | |
traded | Christopher Koster Secretary & General Counsel | Sale | 47,603 | $65.36 | $3.1M | 305,354 | |
traded | Kenneth A. Burdick Director | Sale | 80,000 | $64.55 | $5.2M | 197,086 | |
traded | Kenneth A. Burdick Director | Sale | 66,007 | $39.02 | $2.6M | 272,365 |
GET /stocks/filings/vX/form-4?tickers=CNC&filing_date.gte=2025-10-23&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CNC",
"CNTE"
],
"issuer_cik": "0001071739",
"owner_cik": "0001802501",
"accession_number": "0001071739-26-000169",
"form_type": "4",
"filing_date": "2026-08-27",
"period_of_report": "2026-08-26",
"issuer_name": "CENTENE CORP",
"issuer_trading_symbol": "CNC",
"owner_name": "KOSTER CHRISTOPHER",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Secretary & General Counsel",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-26",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 56500,
"transaction_price_per_share": 66.9,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 248853.991,
"transaction_value": 3779850.0000000005,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The weighted average price for this transaction is reported within the form. Shares were sold at prices ranging from $66.90 to $66.91. Full information regarding the number of shares at each price is available upon request."
},
{
"id": "F2",
"description": "Ownership includes 229,874 shares of previously-granted restricted stock units and performance stock units (reported at target level performance) subject to vesting requirements."
}
]
},
{
"tickers": [
"CNC",
"CNTE"
],
"issuer_cik": "0001071739",
"owner_cik": "0001802501",
"accession_number": "0001071739-26-000167",
"form_type": "4",
"filing_date": "2026-08-19",
"period_of_report": "2026-08-18",
"issuer_name": "CENTENE CORP",
"issuer_trading_symbol": "CNC",
"owner_name": "KOSTER CHRISTOPHER",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Secretary & General Counsel",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-18",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 47603,
"transaction_price_per_share": 65.36,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 305353.991,
"transaction_value": 3111332.08,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The weighted average price for this transaction is reported within the form. Shares were sold at prices ranging from $65.28 to $65.45. Full information regarding the number of shares at each price is available upon request."
},
{
"id": "F2",
"description": "Updated ownership includes common stock acquired through the Company's Employee Stock Purchase Program."
},
{
"id": "F3",
"description": "Ownership includes 229,874 shares of previously-granted restricted stock units and performance stock units (reported at target level performance) subject to vesting requirements."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 46 records
- Tax withholding11 records
- Grants and awards35 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for CNC every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.