NiSource Inc.
US ˙ NYSE ˙ US65473P1057

SecurityNI / NiSource Inc.
InstitutionFirst Manhattan Co
Latest Disclosed Ownership132,588 shares
Latest Disclosed Value $ 6,186,556
First Manhattan Co reports 4.52% decrease in ownership of NI / NiSource Inc.

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 132,588 shares of NiSource Inc. (US:NI) valued at $6,186,556 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 138,864 shares of NiSource Inc.. This represents a change in shares of -4.52% during the quarter. The current value of the position is $6,036,732 USD.

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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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)
2026-05-15 2026-03-31 13F NISOURCE COM 65473P105 132,588 -6,276 -4.52 6,187 6.69 0.0172
2026-02-17 2025-12-31 13F NISOURCE COM 65473P105 138,864 -8,181 -5.56 5,799 -8.94 0.0152
2025-11-14 2025-09-30 13F NISOURCE COM 65473P105 147,045 -5,568 -3.65 6,367 3.43 0.0168
2025-08-14 2025-06-30 13F NISOURCE COM 65473P105 152,613 -6,722 -4.22 6,156 -3.62 0.0174
2025-05-15 2025-03-31 13F NISOURCE COM 65473P105 159,335 -8,090 -4.83 6,388 2.36 0.0186
2025-02-14 2024-12-31 13F NISOURCE COM 65473P105 167,425 -9,399 -5.32 6,241 1.86 0.0183
2024-11-14 2024-09-30 13F NISOURCE COM 65473P105 176,824 -3,150 -1.75 6,127 18.15 0.0182
2024-08-15 2024-06-30 13F/A-1 NISOURCE COM 65473P105 179,974 -5,900 -3.17 5,185 0.86 0.0166
2024-08-14 2024-06-30 13F NISOURCE COM 65473P105 179,974 -5,900 5,185 0.0166
2024-05-15 2024-03-31 13F NISOURCE COM 65473P105 185,874 -3,305 -1.75 5,141 2.37 0.0167
2024-02-13 2023-12-31 13F NISOURCE COM 65473P105 189,179 -5,700 -2.92 5,023 4.43 0.0174
2023-11-14 2023-09-30 13F NISOURCE COM 65473P105 194,879 -268 -0.14 4,810 -9.89 0.0178
2023-08-14 2023-06-30 13F NISOURCE COM 65473P105 195,147 -43,060 -18.08 5,337 -19.86 0.0196
2023-05-15 2023-03-31 13F NISOURCE COM 65473P105 238,207 -9,826 -3.96 6,660 -2.07 0.0255
2023-02-14 2022-12-31 13F NISOURCE COM 65473P105 248,033 -1,900 -0.76 6,801 8.04 0.0249
2022-11-14 2022-09-30 13F NISOURCE COM 65473P105 249,933 -9,700 -3.74 6,295 -17.78 0.0267
2022-08-15 2022-06-30 13F NISOURCE COM 65473P105 259,633 55 0.02 7,656 -7.24 0.0309
2022-05-16 2022-03-31 13F NISOURCE COM 65473P105 259,578 1,600 0.62 8,254 15.89 0.0270
2022-02-14 2021-12-31 13F NISOURCE COM 65473P105 257,978 21,255 8.98 7,122 24.18 0.0235
2021-11-15 2021-09-30 13F NISOURCE COM 65473P105 236,723 0 0.00 5,735 -1.10 0.0211
2021-08-16 2021-06-30 13F NISOURCE COM 65473P105 236,723 -6,839 -2.81 5,799 -1.24 0.0212
2021-05-14 2021-03-31 13F NISOURCE COM 65473P105 243,562 500 0.21 5,872 5.33 0.0253
2021-02-16 2020-12-31 13F NISOURCE COM 65473P105 243,062 -6,833 -2.73 5,575 1.42 0.0267
2020-11-12 2020-09-30 13F NISOURCE COMMON 65473P105 249,895 257 0.10 5,497 -3.15 0.0283
2020-08-14 2020-06-30 13F NISOURCE COMMON 65473P105 249,638 -7,541 -2.93 5,676 -11.60 0.0328
2020-05-06 2020-03-31 13F NISOURCE COMMON 65473P105 257,179 -5,290 -2.02 6,421 -12.13 0.0416
2020-02-13 2019-12-31 13F NISOURCE COMMON 65473P105 262,469 -5,830 -2.17 7,307 -8.97 0.0367
2019-11-13 2019-09-30 13F NISOURCE COMMON 65473P105 268,299 -6,256 -2.28 8,027 1.52 0.0442
2019-08-16 2019-06-30 13F NISOURCE COMMON 65473P105 274,555 -3,550 -1.28 7,907 -0.79 0.0439
2019-04-12 2019-03-31 13F NISOURCE COMMON 65473P105 278,105 -6,025 -2.12 7,970 10.66 0.0460
2019-01-30 2018-12-31 13F NISOURCE COMMON 65473P105 284,130 -12,020 -4.06 7,202 -2.41 0.0448
2018-10-15 2018-09-30 13F NISOURCE COMMON 65473P105 296,150 -2,900 -0.97 7,380 -6.09 0.0393
2018-08-01 2018-06-30 13F NISOURCE COMMON 65473P105 299,050 -1,450 -0.48 7,859 9.40 0.0453
2018-04-20 2018-03-31 13F NISOURCE COMMON 65473P105 300,500 -19,245 -6.02 7,184 -12.46 0.0409
2018-01-22 2017-12-31 13F NISOURCE COMMON 65473P105 319,745 -3,071 -0.95 8,207 -0.64 0.0450
2017-10-25 2017-09-30 13F NISOURCE COMMON 65473P105 322,816 500 0.16 8,260 1.06 0.0473
2017-08-10 2017-06-30 13F/A-2 NISOURCE COMMON 65473P105 322,316 -4,220 -1.29 8,173 5.21 0.0477
2017-08-01 2017-06-30 13F/A-1 NISOURCE COMMON 65473P105 322,316 0 8,173 0.0477
2017-07-28 2017-06-30 13F NISOURCE COMMON 65473P105 322,316 -4,220 8,173
2017-04-25 2017-03-31 13F/A-1 NISOURCE COMMON 65473P105 326,536 -4,115 -1.24 7,768 6.12 0.0461
2017-04-24 2017-03-31 13F NISOURCE COMMON 65473P105 342,949 8,268
2017-01-25 2016-12-31 13F NISOURCE COMMON 65473P105 330,651 -12,298 -3.59 7,320 -11.47 0.0445
2016-10-20 2016-09-30 13F NISOURCE COMMON 65473P105 342,949 -5,300 -1.52 8,268 -10.47 0.0504
2016-07-14 2016-06-30 13F NISOURCE COMMON 65473P105 348,249 1,750 0.51 9,235 13.13 0.0567
2016-04-22 2016-03-31 13F NISOURCE COMMON 65473P105 346,499 530 0.15 8,163 20.95 0.0502
2016-01-20 2015-12-31 13F NISOURCE COMMON 65473P105 345,969 -12,318 -3.44 6,749 1.55 0.0414
2015-10-26 2015-09-30 13F NISOURCE COMMON 65473P105 358,287 -25,725 -6.70 6,646 -62.04 0.0427
2015-07-17 2015-06-30 13F NISOURCE COMMON 65473P105 384,012 -9,805 -2.49 17,507 0.67 0.1034
2015-04-30 2015-03-31 13F NISOURCE COMMON 65473P105 393,817 -10,175 -2.52 17,390 1.48 0.1002
2015-01-20 2014-12-31 13F NISOURCE COMMON 65473P105 403,992 -5,377 -1.31 17,137 2.16 0.0970
2014-10-23 2014-09-30 13F NISOURCE COMMON 65473P105 409,369 -3,500 -0.85 16,775 3.28 0.0976
2014-08-14 2014-06-30 13F/A-1 NISOURCE COMMON 65473P105 412,869 -3,430 -0.82 16,242 9.81 0.1029
2014-05-16 2014-03-31 13F NISOURCE COMMON 65473P105 416,299 -5,890 -1.40 14,791 6.56 0.0974
2014-02-04 2013-12-31 13F NISOURCE COMMON 65473P105 422,189 -13,790 -3.16 13,881 3.07 0.0917
2013-10-29 2013-09-30 13F NISOURCE COMMON 65473P105 435,979 -800 -0.18 13,467 0.07 0.0940
2013-08-13 2013-06-30 13F NISOURCE COMMON 65473P105 436,779 436,779 13,457 0.0926
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.