Tallgrass Energy SC 13E3/A Going private transaction (amended)

Exhibit (c)44

Citigroup Global Markets Inc. | Global Energy Group November 2019 Thunder – Top Shareholders

Thunder – Top 20 Shareholders % Class A Avg. Cost Basis / Avg. Cost Basis Value @ Holder Name Position Latest Chg Filing Date Source Outstanding Share ($) ($mm) $19.50 ($mm) Invesco Ltd 22,061,600 (3,160,039) 9/30/2019 13G 12.3% $21.74 $480 $430 1 2 Tortoise Capital Advisors LLC 19,256,398 2,211,769 9/30/2019 13F 10.8 20.38 392 375 3 ALPS Advisors Inc 18,985,835 4,230,127 9/30/2019 13F 10.6 19.79 376 370 4 Energy Income Partners LLC 6,117,768 2,504,324 9/30/2019 13F 3.4 21.76 133 119 5 JPMorgan Chase & Co 5,574,127 2,567,759 9/30/2019ULT-AGG 3.1 19.06 106 109 6 ClearBridge LLC 4,863,990 (304,596) 9/30/2019ULT-AGG 2.7 21.09 103 95 7 UBS AG 3,980,607 1,572,683 9/30/2019ULT-AGG 2.2 19.71 (8) (9) (1) 8 TIG Advisors LLC 3,460,638 3,460,638 9/30/2019 13F 1.9 NA NA NA 9 Brookfield Public Securities Group 3,364,099 3,364,099 9/30/2019 13F 1.9 NA(1) NA NA 10 Alpine Associates Management Inc 3,265,900 3,265,900 9/30/2019 13F 1.8 NA(1) NA NA 11 Goldman Sachs Group Inc/The 3,062,399 1,389,840 9/30/2019ULT-AGG 1.7 21.10 65 60 12 Jennison Associates LLC 2,643,932 (553,623) 9/30/2019 13F 1.5 21.15 56 52 13 Kayne Anderson Capital Advisors LP 2,491,855 (5,115,268) 9/30/2019 13F 1.4 20.38 51 49 14 Morgan Stanley 1,671,559 194,761 9/30/2019ULT-AGG 0.9 20.18 34 33 15 Global X Management Co LLC 1,653,960 13,805 11/13/2019MF-AGG 0.9 20.68 34 32 16 Guggenheim Partners LLC 1,605,819 (19,299) 9/30/2019ULT-AGG 0.9 20.63 33 31 17 BlackRock Inc 1,569,039 33,831 9/30/2019ULT-AGG 0.9 20.26 32 31 18 Mirae Asset Global Investments Co 1,549,052 455,450 9/30/2019 13F 0.9 20.24 31 30 19 Fiduciary Asset Management FAMCO L 1,508,781 (106,400) 8/30/2019MF-AGG 0.8 20.21 30 29 20 Duff & Phelps Investment Managemen 1,296,131 (455,900) 9/30/2019 13F 0.7 20.92 27 25 (2) Top 20 Sub Total 109,983,489 61.4% $18.35 $1,974 $1,862 Other Shareholders(2) 31,364,731 17.4 17.75 516 612 Total Shareholders (2) 141,348,220 78.8 18.23 2,490 2,473 Source: Bloomberg. Company Filings. Market data as of 11/14/2019. (1) New positions do not have cost basis information available on Bloomberg. 1 (2) ExcludesNon-Institutional investors, Blackstone and TGE Management.

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