Atmos Energy Corporation
Atmos Energy Corporation (ATO) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ATO · as of Sep 30, 2025
Ownership Breakdown
928
Institutional Holders
▲ 43 vs Q2
$27.24B
Total Inst. Value
▲ $2.52B vs Q2
166.92M
Shares Outstanding
freeFloat 99.55%
159.57M
13F Shares Held
▼ 994,525 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ATO largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC natural gas distribution | 20.76M | 13.03% | 13.03% | $3.54T | Nov 7, 2025 | ▲ 47.1K |
BLACKROCK, INC. natural gas distribution | 14.56M | 9.14% | 9.14% | $2.49T | Nov 12, 2025 | ▲ 220.0K |
CAPITAL INTERNATIONAL INVESTORS natural gas distribution | 10.97M | 6.88% | 6.88% | $1.87T | Nov 13, 2025 | ▲ 359.8K |
STATE STREET CORP natural gas distribution | 10.63M | 6.67% | 6.67% | $1.82T | Nov 14, 2025 | ▲ 356.9K |
WELLINGTON MANAGEMENT GROUP LLP natural gas distribution | 10.47M | 6.57% | 6.57% | $1.79T | Nov 14, 2025 | ▼ 916.1K |
PRICE T ROWE ASSOCIATES INC /MD/ natural gas distribution | 7.82M | 4.91% | 4.91% | $1.33T | Nov 14, 2025 | ▲ 73.4K |
ARISTOTLE CAPITAL MANAGEMENT, LLC natural gas distribution | 7.23M | 4.54% | 4.54% | $1.24T | Nov 14, 2025 | ▼ 386.0K |
GEODE CAPITAL MANAGEMENT, LLC natural gas distribution | 4.14M | 2.60% | 2.60% | $703.44B | Nov 12, 2025 | ▲ 62.7K |
BANK OF AMERICA CORP /DE/ natural gas distribution | 3.74M | 2.35% | 2.35% | $638.10B | Feb 3, 2026 | ▲ 84.8K |
INVESCO LTD. natural gas distribution | 3.10M | 1.95% | 1.95% | $529.22B | Nov 13, 2025 | ▲ 17.0K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
30
Increased
+3.12M shares1
New Positions
first time holders19
Decreased
−2.57M shares0
Sold Out
fully exitedNet shares change (top 50)
+549.6K
+3.12M / −2.57M
Net new holders
+12
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ATO insider trading · insider activity
Source: SEC Form 4
8
Buy transactions
12
Sell transactions
0.67
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
ROBBINS J MATT SR VP, HUMAN RESOURCES | May 2, 2026 | Tax Withhold | 1,042 | $189.74 | $197.7K | 27.4K | Form 4 ↗ |
MCDILL JOHN S SR VP, UTILITY OPERATIONS | May 2, 2026 | Tax Withhold | 1,042 | $189.74 | $197.7K | 36.4K | Form 4 ↗ |
HARTSFIELD KAREN E Senior Advisor | May 2, 2026 | Tax Withhold | 1,042 | $189.74 | $197.7K | 33.0K | Form 4 ↗ |
Forsythe Christopher T SR VICE PRESIDENT & CFO | May 2, 2026 | Tax Withhold | 1,563 | $189.74 | $296.6K | 62.0K | Form 4 ↗ |
FAULK MICHELLE Vice President & Controller | May 2, 2026 | Tax Withhold | 70 | $189.74 | $13.3K | 1.2K | Form 4 ↗ |
AKERS JOHN K PRESIDENT & CEO | May 2, 2026 | Tax Withhold | 6,235 | $187.74 | $1.17M | 136.0K | Form 4 ↗ |
GARZA RAFAEL G director | Apr 1, 2026 | Award | 60 | $185.09 | $11.1K | 192 | Form 4 ↗ |
Geiser Edward director | Apr 1, 2026 | Award | 175.59 | — | — | 1.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Atmos Energy Corporation (ATO) is primarily owned by institutional investors, who hold approximately 95.6% of total shares outstanding. Company insiders own approximately 0.45%, while retail and public investors account for the remaining 3.95%.
The largest institutional shareholder of Atmos Energy Corporation is VANGUARD GROUP INC, holding approximately 20.76 million shares — equal to 13.03% of outstanding shares — as of September 30, 2025.
A total of 928 institutional investors currently hold ATO stock, with a combined institutional value of approximately $27.24 billion as of the most recent 13F filing period.
Frequently asked questions
ATO ownershipAtmos Energy Corporation (ATO) is primarily owned by institutional investors, who hold approximately 95.6% of shares. The largest shareholder is VANGUARD GROUP INC with a 13.03% stake. Company insiders hold 0.45%. Data sourced from SEC Form 13F as of September 30, 2025.