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ATO · Atmos Energy Corp · Holdings

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Market Cap
$27.73B
Shares
168.99M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,044
Total Value: $28,048,155,043
Total Shares: 162,814,375
Showing 1–100 of 1,052 holdings by value · page 1 of 11

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,044 13F filers · Δ vs Mar 31, 2026
Top Holder
9.4%
Sep 2023 → Jun 2026 · range 9.4% – 14.2%
−1.5 pts
Top 5
34.4%
Sep 2023 → Jun 2026 · range 34.4% – 49.0%
−2.1 pts
Top 10
48.1%
Sep 2023 → Jun 2026 · range 48.1% – 59.4%
−3.9 pts
HHI
319
Sep 2023 → Jun 2026 · range 319 – 579
Broadly held−46

Quarterly Activity

vs Mar 31, 2026
New
133
Increased
415
Decreased
345
Sold Out
110
Unchanged
151
Holder count: +23
Institutional value: -5.2%
Shares held: +1.7%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,052
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 731802 CUSIP 049560105 13F (30d) 299 filings 297 filers Visit website Investor relations