SEC Form 4
The Southern Company (SO) insider trading
In the 12 months to Oct 24, 2026, 6 SO insiders reported open-market sales of $5.6M across 13 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $5.6M
- 13 filings · 6 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 11 of 13
- $4.9M of $5.6M sold (86%)
Who traded SO, and when
- Sale
- Sale, pre-arranged (10b5-1)
SO daily close from Oct 24, 2025 to Oct 23, 2026, between $82.35 and $99.11, last $92.89. 13 sale and 0 purchase filings by 6 insiders, marked at their filing dates. Greene Kimberly S, Chairman, President & CEO, GPC: sold $2.4M across 1 filing, first filed Mar 31, 2026, last Mar 31, 2026. Stan W. Connally, EVP & COO: sold $1.2M across 1 filing, first filed Mar 19, 2026, last Mar 19, 2026. Matthew M. Kim, Comptroller: sold $666.8K across 8 filings, first filed Feb 25, 2026, last Oct 1, 2026. Christopher Cummiskey, EVP: sold $643.9K across 1 filing, first filed Mar 19, 2026, last Mar 19, 2026. Peter P. Sena III, Chairman,President & CEO, SNC: sold $377.9K across 1 filing, first filed Sep 4, 2026, last Sep 4, 2026. Sterling A. Spainhour JR., EVP & CLO: sold $313.4K across 1 filing, first filed Aug 7, 2026, last Aug 7, 2026.
Largest mark · tap a row for others
Greene Kimberly S · Chairman, President & CEO, GPC
Sale $2,416,750
25,000 shares at $96.67 avg
Filed Mar 31, 2026 · traded Mar 30
Pre-arranged (10b5-1) · close on filing date $96.52
Greene Kimberly S · Chairman, President & CEO, GPC
Chairman, President & CEO, GPC
$2.4M soldStan W. Connally · EVP & COO
EVP & COO
$1.2M soldMatthew M. Kim · Comptroller
Comptroller
$666.8K soldChristopher Cummiskey · EVP
EVP
$643.9K soldPeter P. Sena III · Chairman,President & CEO, SNC
Chairman,President & CEO, SNC
$377.9K soldSterling A. Spainhour JR. · EVP & CLO
EVP & CLO
$313.4K soldHas The Southern Company's CEO sold stock?
Yes. Peter P. Sena III (CEO) sold 4,266 shares ($377.9K) in Sep 2026, all under a pre-arranged 10b5-1 plan. Greene Kimberly S (CEO) sold 25,000 shares ($2.4M) in Mar 2026, all under a pre-arranged 10b5-1 plan. Christopher C. Womack and Pedro P. Cherry and James Jeffrey Peoples and II James Y. Kerr (CEOs) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
13 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Greene Kimberly S | Chairman, President & CEO, GPC | $2.4M | — | 1 | 100% of sales | |
| Stan W. Connally | EVP & COO | $1.2M | — | 1 | 100% of sales | |
| Matthew M. Kim | Comptroller | $666.8K | — | 8 | 81% of sales | |
| Christopher Cummiskey | EVP | $643.9K | — | 1 | — | |
| Peter P. Sena III | Chairman,President & CEO, SNC | $377.9K | — | 1 | 100% of sales | |
| Sterling A. Spainhour JR. | EVP & CLO | $313.4K | — | 1 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 100 | $82.73 | $8.3K | 4,888 | |
traded | Matthew M. Kim Comptroller | Sale | 1,400 | $88.87 | $124.4K | 4,988 | |
traded | Peter P. Sena III Chairman,President & CEO, SNC | SalePre-arranged (10b5-1) | 4,266 | $88.59 | $377.9K | 26,935 | |
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 100 | $88.45 | $8.8K | 6,400 | |
traded | Sterling A. Spainhour JR. EVP & CLO | SalePre-arranged (10b5-1) | 3,333 | $94.02 | $313.4K | 35,219 | |
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 100 | $94.28 | $9.4K | 6,488 | |
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 100 | $95.77 | $9.6K | 6,588 | |
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 100 | $91.16 | $9.1K | 6,688 | |
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 100 | $96.57 | $9.7K | 6,788 | |
traded | Greene Kimberly S Chairman, President & CEO, GPC | SalePre-arranged (10b5-1) | 25,000 | $96.67 | $2.4M | 103,602 | |
traded | Stan W. Connally EVP & COO | SalePre-arranged (10b5-1) | 12,500 | $97.13 | $1.2M | 161,481 | |
traded | Christopher Cummiskey EVP | Sale | 6,669 | $96.55 | $643.9K | 30,800 | |
traded | Matthew M. Kim Comptroller | SalePre-arranged (10b5-1) | 5,123 | $95.15 | $487.5K | 6,888 |
GET /stocks/filings/vX/form-4?tickers=SO&filing_date.gte=2025-10-24&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"SO",
"SOJC",
"SOJD",
"SOJE",
"SOJF",
"SOMN"
],
"issuer_cik": "0000092122",
"owner_cik": "0002082705",
"accession_number": "0001193125-26-410627",
"form_type": "4",
"filing_date": "2026-10-01",
"period_of_report": "2026-10-01",
"issuer_name": "SOUTHERN CO",
"issuer_trading_symbol": "SO",
"owner_name": "Kim Matthew M.",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Comptroller",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Southern Company Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 100,
"transaction_price_per_share": 82.73,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 4888,
"transaction_value": 8273,
"direct_or_indirect": "D"
},
{
"tickers": [
"SO",
"SOJC",
"SOJD",
"SOJE",
"SOJF",
"SOMN"
],
"issuer_cik": "0000092122",
"owner_cik": "0002023851",
"accession_number": "0001193125-26-383301",
"form_type": "4",
"filing_date": "2026-09-04",
"period_of_report": "2026-09-03",
"issuer_name": "SOUTHERN CO",
"issuer_trading_symbol": "SO",
"owner_name": "Sena Peter P III",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chairman,President & CEO, SNC",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Southern Company Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-03",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 4266,
"transaction_price_per_share": 88.59,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 26935,
"transaction_value": 377924.94,
"direct_or_indirect": "D"
}
]
}
// 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) · 125 records
- Option exercises46 records
- Tax withholding60 records
- Grants and awards14 records
- Gifts4 records
- Other1 record
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 SO 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.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.