NORTHERN TR CORP

Ticker: NTRS CUSIP: 665859104 Class: COM

GAMCO INVESTORS, INC. ET AL's Holding History (CIK: 0000807249)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 163,098 Value ($000) $22,278 Avg Close $130.74 Range $120.39 - $141.25

Q3 2025

Shares 168,992 Value ($000) $22,746 Avg Close $127.35 Range $117.54 - $134.67

Q2 2025

Shares 176,740 Value ($000) $22,409 Avg Close $100.50 Range $80.06 - $125.55

Q1 2025

Shares 184,846 Value ($000) $18,235 Avg Close $103.45 Range $93.23 - $111.60

Q4 2024

Shares 195,695 Value ($000) $20,059 Avg Close $99.01 Range $84.76 - $108.13

Q3 2024

Shares 205,007 Value ($000) $18,457 Avg Close $84.00 Range $77.46 - $89.72

Q2 2024

Shares 209,682 Value ($000) $17,609 Avg Close $79.92 Range $75.34 - $84.71

Q1 2024

Shares 220,042 Value ($000) $19,566 Avg Close $77.38 Range $72.15 - $84.77

Q4 2023

Shares 222,882 Value ($000) $18,807 Avg Close $69.13 Range $58.21 - $81.80

Q3 2023

Shares 230,295 Value ($000) $16,001 Avg Close $69.90 Range $63.24 - $76.10

Q2 2023

Shares 235,295 Value ($000) $17,445 Avg Close $70.33 Range $63.56 - $82.80

Q1 2023

Shares 239,950 Value ($000) $21,147 Avg Close $84.16 Range $73.69 - $90.89

Q4 2022

Shares 247,563 Value ($000) $21,907 Avg Close $78.90 Range $68.45 - $85.44

Q3 2022

Shares 254,105 Value ($000) $21,741 Avg Close $86.27 Range $75.57 - $93.27

Q2 2022

Shares 265,655 Value ($000) $25,630 Avg Close $93.79 Range $79.99 - $104.77

Q1 2022

Shares 267,805 Value ($000) $31,186 Avg Close $104.54 Range $90.15 - $118.99

Q4 2021

Shares 274,477 Value ($000) $32,830 Avg Close $105.01 Range $93.28 - $110.92

Q3 2021

Shares 280,635 Value ($000) $30,255 Avg Close $98.91 Range $91.25 - $105.90

Q2 2021

Shares 286,376 Value ($000) $33,111 Avg Close $99.29 Range $88.58 - $106.46

Q1 2021

Shares 291,226 Value ($000) $30,611 Avg Close $84.43 Range $75.75 - $93.36

Q4 2020

Shares 296,326 Value ($000) $27,600 Avg Close $75.32 Range $64.54 - $84.00

Q3 2020

Shares 310,226 Value ($000) $24,188 Avg Close $67.99 Range $61.38 - $73.22

Q2 2020

Shares 342,051 Value ($000) $27,138 Avg Close $66.60 Range $56.52 - $77.90

Q1 2020

Shares 385,351 Value ($000) $29,079 Avg Close $76.24 Range $50.86 - $91.21

Q4 2019

Shares 396,547 Value ($000) $42,129 Avg Close $84.53 Range $70.73 - $91.70

Q3 2019

Shares 430,569 Value ($000) $40,181 Avg Close $75.31 Range $68.73 - $82.36

Q2 2019

Shares 504,048 Value ($000) $45,364 Avg Close $75.01 Range $68.81 - $81.17

Q1 2019

Shares 542,598 Value ($000) $49,056 Avg Close $72.96 Range $66.04 - $78.80

Q4 2018

Shares 565,509 Value ($000) $47,271 Avg Close $75.32 Range $61.37 - $86.09

Q3 2018

Shares 579,961 Value ($000) $59,231 Avg Close $85.59 Range $81.23 - $92.33

Q2 2018

Shares 601,355 Value ($000) $61,873 Avg Close $84.33 Range $79.47 - $87.26

Q1 2018

Shares 637,668 Value ($000) $65,763 Avg Close $82.97 Range $74.79 - $88.15

Q4 2017

Shares 677,271 Value ($000) $67,653 Avg Close $75.28 Range $71.84 - $80.39

Q3 2017

Shares 816,656 Value ($000) $75,075 Avg Close $71.05 Range $67.61 - $77.97

Q2 2017

Shares 851,347 Value ($000) $82,759 Avg Close $70.42 Range $66.40 - $77.52

Q1 2017

Shares 935,227 Value ($000) $80,972 Avg Close $67.79 Range $63.77 - $70.95

Q4 2016

Shares 981,143 Value ($000) $87,371 Avg Close $61.69 Range $52.36 - $70.81

Q3 2016

Shares 1,029,729 Value ($000) $70,011 Avg Close $52.45 Range $47.67 - $55.52

Q2 2016

Shares 1,032,804 Value ($000) $68,434 Avg Close $53.49 Range $47.26 - $57.41

Q1 2016

Shares 1,075,304 Value ($000) $70,078 Avg Close $47.88 Range $41.46 - $54.24

Q4 2015

Shares 1,103,445 Value ($000) $79,547 Avg Close $54.64 Range $49.15 - $57.77

Q3 2015

Shares 1,155,895 Value ($000) $78,786 Avg Close $55.52 Range $49.19 - $59.82

Q2 2015

Shares 1,328,995 Value ($000) $101,615 Avg Close $56.07 Range $51.74 - $59.54

Q1 2015

Shares 1,541,195 Value ($000) $107,344 Avg Close $51.14 Range $45.68 - $54.62

Q4 2014

Shares 1,608,769 Value ($000) $108,431 Avg Close $49.58 Range $45.22 - $51.59

Q3 2014

Shares 1,646,267 Value ($000) $111,996 Avg Close $49.84 Range $46.73 - $52.70

Q2 2014

Shares 1,656,880 Value ($000) $106,388 Avg Close $45.46 Range $42.93 - $48.59

Q1 2014

Shares 1,657,395 Value ($000) $108,659 Avg Close $45.55 Range $42.73 - $49.47

Q4 2013

Shares 1,682,295 Value ($000) $104,117 Avg Close $41.82 Range $38.19 - $45.43

Q3 2013

Shares 1,702,255 Value ($000) $92,569 Avg Close $41.67 Range $39.30 - $44.95

Q2 2013

Shares 1,706,756 Value ($000) $98,821 Avg Close $40.35 Range $37.41 - $42.83

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	163,098	$22,278	$130.74	$120.39 - $141.25
Q3 2025	168,992	$22,746	$127.35	$117.54 - $134.67
Q2 2025	176,740	$22,409	$100.50	$80.06 - $125.55
Q1 2025	184,846	$18,235	$103.45	$93.23 - $111.60
Q4 2024	195,695	$20,059	$99.01	$84.76 - $108.13
Q3 2024	205,007	$18,457	$84.00	$77.46 - $89.72
Q2 2024	209,682	$17,609	$79.92	$75.34 - $84.71
Q1 2024	220,042	$19,566	$77.38	$72.15 - $84.77
Q4 2023	222,882	$18,807	$69.13	$58.21 - $81.80
Q3 2023	230,295	$16,001	$69.90	$63.24 - $76.10
Q2 2023	235,295	$17,445	$70.33	$63.56 - $82.80
Q1 2023	239,950	$21,147	$84.16	$73.69 - $90.89
Q4 2022	247,563	$21,907	$78.90	$68.45 - $85.44
Q3 2022	254,105	$21,741	$86.27	$75.57 - $93.27
Q2 2022	265,655	$25,630	$93.79	$79.99 - $104.77
Q1 2022	267,805	$31,186	$104.54	$90.15 - $118.99
Q4 2021	274,477	$32,830	$105.01	$93.28 - $110.92
Q3 2021	280,635	$30,255	$98.91	$91.25 - $105.90
Q2 2021	286,376	$33,111	$99.29	$88.58 - $106.46
Q1 2021	291,226	$30,611	$84.43	$75.75 - $93.36
Q4 2020	296,326	$27,600	$75.32	$64.54 - $84.00
Q3 2020	310,226	$24,188	$67.99	$61.38 - $73.22
Q2 2020	342,051	$27,138	$66.60	$56.52 - $77.90
Q1 2020	385,351	$29,079	$76.24	$50.86 - $91.21
Q4 2019	396,547	$42,129	$84.53	$70.73 - $91.70
Q3 2019	430,569	$40,181	$75.31	$68.73 - $82.36
Q2 2019	504,048	$45,364	$75.01	$68.81 - $81.17
Q1 2019	542,598	$49,056	$72.96	$66.04 - $78.80
Q4 2018	565,509	$47,271	$75.32	$61.37 - $86.09
Q3 2018	579,961	$59,231	$85.59	$81.23 - $92.33
Q2 2018	601,355	$61,873	$84.33	$79.47 - $87.26
Q1 2018	637,668	$65,763	$82.97	$74.79 - $88.15
Q4 2017	677,271	$67,653	$75.28	$71.84 - $80.39
Q3 2017	816,656	$75,075	$71.05	$67.61 - $77.97
Q2 2017	851,347	$82,759	$70.42	$66.40 - $77.52
Q1 2017	935,227	$80,972	$67.79	$63.77 - $70.95
Q4 2016	981,143	$87,371	$61.69	$52.36 - $70.81
Q3 2016	1,029,729	$70,011	$52.45	$47.67 - $55.52
Q2 2016	1,032,804	$68,434	$53.49	$47.26 - $57.41
Q1 2016	1,075,304	$70,078	$47.88	$41.46 - $54.24
Q4 2015	1,103,445	$79,547	$54.64	$49.15 - $57.77
Q3 2015	1,155,895	$78,786	$55.52	$49.19 - $59.82
Q2 2015	1,328,995	$101,615	$56.07	$51.74 - $59.54
Q1 2015	1,541,195	$107,344	$51.14	$45.68 - $54.62
Q4 2014	1,608,769	$108,431	$49.58	$45.22 - $51.59
Q3 2014	1,646,267	$111,996	$49.84	$46.73 - $52.70
Q2 2014	1,656,880	$106,388	$45.46	$42.93 - $48.59
Q1 2014	1,657,395	$108,659	$45.55	$42.73 - $49.47
Q4 2013	1,682,295	$104,117	$41.82	$38.19 - $45.43
Q3 2013	1,702,255	$92,569	$41.67	$39.30 - $44.95
Q2 2013	1,706,756	$98,821	$40.35	$37.41 - $42.83