The Southern Company
MX ˙ BMV ˙ US8425871071
SecurityMX:SO / The Southern Company
InstitutionBlair William & Co/il
Latest Disclosed Ownership131,248 shares
Latest Disclosed Value $ 12,668,033
Blair William & Co/il ownership in SO / The Southern Company

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 131,248 shares of The Southern Company (MX:SO) valued at $12,668,033 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 128,905 shares of The Southern Company. This represents a change in shares of 1.82% during the quarter.

Blair William & Co/il has a history of taking positions in derivatives of the underlying security (SO) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:SO / The Southern Company Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-08 2026-03-31 13F SOUTHERN COM 842587107 131,248 2,343 1.82 12,668 12.70 0.0363
2026-02-17 2025-12-31 13F SOUTHERN COM 842587107 128,905 4,452 3.58 11,240 -4.70 0.0302
2025-11-12 2025-09-30 13F SOUTHERN COM 842587107 124,453 21,857 21.30 11,794 25.19 0.0314
2025-07-24 2025-06-30 13F SOUTHERN COM 842587107 102,596 795 0.78 9,421 0.65 0.0262
2025-05-09 2025-03-31 13F SOUTHERN COM 842587107 101,801 -1,426 -1.38 9,361 10.16 0.0282
2025-02-12 2024-12-31 13F SOUTHERN COM 842587107 103,227 -1,055 -1.01 8,498 -9.64 0.0247
2024-11-12 2024-09-30 13F SOUTHERN COM 842587107 104,282 3,870 3.85 9,404 20.75 0.0276
2024-08-12 2024-06-30 13F SOUTHERN COM 842587107 100,412 8,514 9.26 7,789 18.14 0.0240
2024-05-09 2024-03-31 13F SOUTHERN COM 842587107 91,898 1,415 1.56 6,593 3.91 0.0207
2024-02-12 2023-12-31 13F SOUTHERN COM 842587107 90,483 898 1.00 6,345 9.44 0.0216
2023-11-09 2023-09-30 13F SOUTHERN COM 842587107 89,585 -1,360 -1.50 5,798 -9.25 0.0222
2023-08-11 2023-06-30 13F SOUTHERN COM 842587107 90,945 758 0.84 6,389 1.80 0.0234
2023-05-12 2023-03-31 13F SOUTHERN COM 842587107 90,187 -1,798 -1.95 6,275 -4.46 0.0251
2023-02-10 2022-12-31 13F SOUTHERN COM 842587107 91,985 -3,835 -4.00 6,569 0.80 0.0286
2022-11-09 2022-09-30 13F SOUTHERN COM 842587107 95,820 19 0.02 6,516 -4.63 0.0299
2022-08-10 2022-06-30 13F SOUTHERN COM 842587107 95,801 1,219 1.29 6,832 -0.38 0.0303
2022-05-13 2022-03-31 13F SOUTHERN COM 842587107 94,582 -603 -0.63 6,858 5.06 0.0240
2022-02-14 2021-12-31 13F SOUTHERN COM 842587107 95,185 3,564 3.89 6,528 14.97 0.0205
2021-11-12 2021-09-30 13F SOUTHERN COM 842587107 91,621 1,850 2.06 5,678 4.53 0.0193
2021-08-12 2021-06-30 13F SOUTHERN COM 842587107 89,771 108 0.12 5,432 -2.53 0.0188
2021-05-13 2021-03-31 13F SOUTHERN COM 842587107 89,663 -2,489 -2.70 5,573 -1.55 0.0210
2021-02-09 2020-12-31 13F SOUTHERN COM 842587107 92,152 8,307 9.91 5,661 24.53 0.0208
2020-11-06 2020-09-30 13F SOUTHERN COM 842587107 83,845 10,771 14.74 4,546 19.98 0.0193
2020-08-12 2020-06-30 13F SOUTHERN COM 842587107 73,074 125 0.17 3,789 -4.05 0.0181
2020-05-11 2020-03-31 13F SOUTHERN COM 842587107 72,949 3,004 4.29 3,949 -11.38 0.0247
2020-02-13 2019-12-31 13F SOUTHERN COM 842587107 69,945 11,973 20.65 4,456 24.43 0.0229
2019-11-12 2019-09-30 13F SOUTHERN COM 842587107 57,972 -1,677 -2.81 3,581 8.61 0.0206
2019-08-13 2019-06-30 13F SOUTHERN COM 842587107 59,649 -2,135 -3.46 3,297 3.26 0.0189
2019-05-14 2019-03-31 13F SOUTHERN COM 842587107 61,784 2,076 3.48 3,193 21.78 0.0195
2019-02-14 2018-12-31 13F SOUTHERN COM 842587107 59,708 1,306 2.24 2,622 2.99 0.0191
2018-11-13 2018-09-30 13F SOUTHERN COM 842587107 58,402 -2,155 -3.56 2,546 -9.20 0.0156
2018-08-13 2018-06-30 13F SOUTHERN COM 842587107 60,557 633 1.06 2,804 4.78 0.0191
2018-05-15 2018-03-31 13F SOUTHERN COM 842587107 59,924 -12,543 -17.31 2,676 -23.21 0.0189
2018-02-14 2017-12-31 13F SOUTHERN COM 842587107 72,467 7,623 11.76 3,485 9.38 0.0237
2017-11-13 2017-09-30 13F SOUTHERN COM 842587107 64,844 1,841 2.92 3,186 5.60 0.0239
2017-08-04 2017-06-30 13F SOUTHERN COM 842587107 63,003 8,327 15.23 3,017 9.11 0.0227
2017-05-10 2017-03-31 13F SOUTHERN COM 842587107 54,676 4,899 9.84 2,765 12.90 0.0223
2017-02-14 2016-12-31 13F SOUTHERN COM 842587107 49,777 1,289 2.66 2,449 -1.53 0.0219
2016-11-14 2016-09-30 13F SOUTHERN COM 842587107 48,488 5,260 12.17 2,487 7.29 0.0220
2016-08-08 2016-06-30 13F SOUTHERN COM 842587107 43,228 2,945 7.31 2,318 11.28 0.0216
2016-05-16 2016-03-31 13F SOUTHERN COM 842587107 40,283 -3,566 -8.13 2,083 1.56 0.0196
2016-02-16 2015-12-31 13F SOUTHERN COM 842587107 43,849 -53 -0.12 2,051 4.54 0.0193
2015-11-12 2015-09-30 13F SOUTHERN COM 842587107 43,902 4,515 11.46 1,962 18.91 0.0170
2015-08-03 2015-06-30 13F SOUTHERN COM 842587107 39,387 4,286 12.21 1,650 6.25 0.0025
2015-05-11 2015-03-31 13F SOUTHERN COM 842587107 35,101 35,101 0.00 1,553 0.0024
2015-02-05 2014-12-31 13F SOUTHERN COM 842587107 0 -35,855 -100.00 0 -100.00
2014-11-04 2014-09-30 13F SOUTHERN COM 842587107 35,855 -6,490 -15.33 1,565 -18.53 0.0027
2014-08-01 2014-06-30 13F SOUTHERN COM 842587107 42,345 -4,599 -9.80 1,921 -6.88 0.0031
2014-05-06 2014-03-31 13F SOUTHERN COM 842587107 46,944 969 2.11 2,063 9.15 0.0034
2014-02-11 2013-12-31 13F SOUTHERN COM 842587107 45,975 -8,561 -15.70 1,890 -15.81 0.0031
2013-11-12 2013-09-30 13F SOUTHERN COM 842587107 54,536 -1,823 -3.23 2,245 -9.73 0.0040
2013-08-07 2013-06-30 13F SOUTHERN COM 842587107 56,359 56,359 2,487 0.0049
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2017-11-13 2017-09-30 13F SOUTHERN OPTION Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-08-04 2017-06-30 13F SOUTHERN OPTION Call 4,000 207.69 192 195.38 n/a n/a n/a
2017-05-10 2017-03-31 13F SOUTHERN OPTION Call 1,300 0.00 65 n/a n/a n/a
2017-02-14 2016-12-31 13F SOUTHERN CO CALL OPT 11 OPTION Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-11-14 2016-09-30 13F SOUTHERN CO CALL OPT 11 OPTION Call 5,500 282 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.