AMBAC FINL GROUP INC

Ticker: OSG CUSIP: 023139884 Class: Common Stock

NORTHERN TRUST CORP's Holding History (CIK: 0000073124)

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

Q4 2025

Shares 323,146 Value ($000) $2,514 Avg Close $8.55 Range $7.63 - $10.38

Q3 2025

Shares 362,021 Value ($000) $3,019 Avg Close $8.45 Range $6.86 - $10.05

Q2 2025

Shares 388,921 Value ($000) $2,761 Avg Close $7.45 Range $5.99 - $8.69

Q1 2025

Shares 461,256 Value ($000) $4,036 Avg Close $10.53 Range $7.92 - $12.84

Q4 2024

Shares 536,486 Value ($000) $6,787 Avg Close $12.05 Range $10.83 - $13.64

Q3 2024

Shares 473,056 Value ($000) $5,303 Avg Close $11.69 Range $10.12 - $13.32

Q2 2024

Shares 481,098 Value ($000) $6,168 Avg Close $15.25 Range $11.80 - $18.45

Q1 2024

Shares 495,412 Value ($000) $7,743 Avg Close $15.77 Range $14.53 - $17.80

Q4 2023

Shares 504,697 Value ($000) $8,317 Avg Close $13.90 Range $11.26 - $16.60

Q3 2023

Shares 501,729 Value ($000) $6,051 Avg Close $13.44 Range $11.99 - $14.64

Q2 2023

Shares 501,667 Value ($000) $7,144 Avg Close $14.63 Range $13.18 - $16.10

Q1 2023

Shares 493,964 Value ($000) $7,647 Avg Close $16.18 Range $14.17 - $17.75

Q4 2022

Shares 499,171 Value ($000) $8,706 Avg Close $14.86 Range $12.55 - $17.59

Q3 2022

Shares 490,282 Value ($000) $6,251 Avg Close $13.32 Range $11.15 - $15.59

Q2 2022

Shares 503,438 Value ($000) $5,714 Avg Close $9.49 Range $7.24 - $11.85

Q1 2022

Shares 515,659 Value ($000) $5,363 Avg Close $13.55 Range $8.14 - $16.64

Q4 2021

Shares 530,591 Value ($000) $8,515 Avg Close $15.71 Range $14.07 - $17.86

Q3 2021

Shares 494,648 Value ($000) $7,083 Avg Close $14.28 Range $13.09 - $15.94

Q2 2021

Shares 521,170 Value ($000) $8,162 Avg Close $16.07 Range $13.94 - $17.82

Q1 2021

Shares 535,654 Value ($000) $8,968 Avg Close $16.34 Range $14.13 - $18.63

Q4 2020

Shares 558,761 Value ($000) $8,594 Avg Close $14.74 Range $11.92 - $18.19

Q3 2020

Shares 578,508 Value ($000) $7,387 Avg Close $12.88 Range $11.14 - $14.75

Q2 2020

Shares 601,665 Value ($000) $8,615 Avg Close $14.62 Range $10.58 - $17.64

Q1 2020

Shares 607,600 Value ($000) $7,498 Avg Close $19.17 Range $8.74 - $22.90

Q4 2019

Shares 608,876 Value ($000) $13,134 Avg Close $20.51 Range $19.05 - $21.95

Q3 2019

Shares 614,952 Value ($000) $12,021 Avg Close $18.37 Range $16.69 - $20.74

Q2 2019

Shares 599,852 Value ($000) $10,107 Avg Close $17.07 Range $14.44 - $19.28

Q1 2019

Shares 591,412 Value ($000) $10,716 Avg Close $19.10 Range $17.01 - $21.01

Q4 2018

Shares 578,607 Value ($000) $9,975 Avg Close $18.36 Range $15.02 - $21.38

Q3 2018

Shares 578,479 Value ($000) $11,814 Avg Close $20.88 Range $19.30 - $23.34

Q2 2018

Shares 565,993 Value ($000) $11,235 Avg Close $18.46 Range $15.17 - $21.11

Q1 2018

Shares 545,389 Value ($000) $8,552 Avg Close $15.46 Range $13.96 - $17.09

Q4 2017

Shares 543,151 Value ($000) $8,680 Avg Close $15.38 Range $13.17 - $17.79

Q3 2017

Shares 549,809 Value ($000) $9,489 Avg Close $18.46 Range $16.75 - $22.02

Q2 2017

Shares 557,464 Value ($000) $9,671 Avg Close $17.77 Range $15.67 - $20.28

Q1 2017

Shares 547,567 Value ($000) $10,326 Avg Close $21.04 Range $17.39 - $23.55

Q4 2016

Shares 519,472 Value ($000) $11,689 Avg Close $21.85 Range $17.75 - $27.25

Q3 2016

Shares 509,622 Value ($000) $9,372 Avg Close $17.94 Range $15.42 - $19.35

Q2 2016

Shares 504,170 Value ($000) $8,298 Avg Close $16.04 Range $14.42 - $17.77

Q1 2016

Shares 499,721 Value ($000) $7,895 Avg Close $14.47 Range $11.92 - $17.32

Q4 2015

Shares 490,648 Value ($000) $6,914 Avg Close $15.37 Range $12.72 - $17.39

Q3 2015

Shares 473,826 Value ($000) $6,857 Avg Close $16.22 Range $14.22 - $19.17

Q2 2015

Shares 465,904 Value ($000) $7,753 Avg Close $23.61 Range $16.44 - $25.91

Q1 2015

Shares 486,979 Value ($000) $11,786 Avg Close $25.43 Range $23.99 - $27.53

Q4 2014

Shares 476,953 Value ($000) $11,686 Avg Close $23.29 Range $18.60 - $26.74

Q3 2014

Shares 497,913 Value ($000) $11,004 Avg Close $23.53 Range $21.86 - $27.54

Q2 2014

Shares 525,052 Value ($000) $14,339 Avg Close $29.00 Range $26.37 - $32.20

Q1 2014

Shares 562,971 Value ($000) $17,468 Avg Close $27.62 Range $22.00 - $35.61

Q4 2013

Shares 611,865 Value ($000) $15,027 Avg Close $20.94 Range $15.03 - $25.16

Q3 2013

Shares 594,800 Value ($000) $10,790 Avg Close $22.78 Range $17.64 - $25.70

Q2 2013

Shares 237,514 Value ($000) $5,660 Avg Close $24.24 Range $18.00 - $27.25

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	323,146	$2,514	$8.55	$7.63 - $10.38
Q3 2025	362,021	$3,019	$8.45	$6.86 - $10.05
Q2 2025	388,921	$2,761	$7.45	$5.99 - $8.69
Q1 2025	461,256	$4,036	$10.53	$7.92 - $12.84
Q4 2024	536,486	$6,787	$12.05	$10.83 - $13.64
Q3 2024	473,056	$5,303	$11.69	$10.12 - $13.32
Q2 2024	481,098	$6,168	$15.25	$11.80 - $18.45
Q1 2024	495,412	$7,743	$15.77	$14.53 - $17.80
Q4 2023	504,697	$8,317	$13.90	$11.26 - $16.60
Q3 2023	501,729	$6,051	$13.44	$11.99 - $14.64
Q2 2023	501,667	$7,144	$14.63	$13.18 - $16.10
Q1 2023	493,964	$7,647	$16.18	$14.17 - $17.75
Q4 2022	499,171	$8,706	$14.86	$12.55 - $17.59
Q3 2022	490,282	$6,251	$13.32	$11.15 - $15.59
Q2 2022	503,438	$5,714	$9.49	$7.24 - $11.85
Q1 2022	515,659	$5,363	$13.55	$8.14 - $16.64
Q4 2021	530,591	$8,515	$15.71	$14.07 - $17.86
Q3 2021	494,648	$7,083	$14.28	$13.09 - $15.94
Q2 2021	521,170	$8,162	$16.07	$13.94 - $17.82
Q1 2021	535,654	$8,968	$16.34	$14.13 - $18.63
Q4 2020	558,761	$8,594	$14.74	$11.92 - $18.19
Q3 2020	578,508	$7,387	$12.88	$11.14 - $14.75
Q2 2020	601,665	$8,615	$14.62	$10.58 - $17.64
Q1 2020	607,600	$7,498	$19.17	$8.74 - $22.90
Q4 2019	608,876	$13,134	$20.51	$19.05 - $21.95
Q3 2019	614,952	$12,021	$18.37	$16.69 - $20.74
Q2 2019	599,852	$10,107	$17.07	$14.44 - $19.28
Q1 2019	591,412	$10,716	$19.10	$17.01 - $21.01
Q4 2018	578,607	$9,975	$18.36	$15.02 - $21.38
Q3 2018	578,479	$11,814	$20.88	$19.30 - $23.34
Q2 2018	565,993	$11,235	$18.46	$15.17 - $21.11
Q1 2018	545,389	$8,552	$15.46	$13.96 - $17.09
Q4 2017	543,151	$8,680	$15.38	$13.17 - $17.79
Q3 2017	549,809	$9,489	$18.46	$16.75 - $22.02
Q2 2017	557,464	$9,671	$17.77	$15.67 - $20.28
Q1 2017	547,567	$10,326	$21.04	$17.39 - $23.55
Q4 2016	519,472	$11,689	$21.85	$17.75 - $27.25
Q3 2016	509,622	$9,372	$17.94	$15.42 - $19.35
Q2 2016	504,170	$8,298	$16.04	$14.42 - $17.77
Q1 2016	499,721	$7,895	$14.47	$11.92 - $17.32
Q4 2015	490,648	$6,914	$15.37	$12.72 - $17.39
Q3 2015	473,826	$6,857	$16.22	$14.22 - $19.17
Q2 2015	465,904	$7,753	$23.61	$16.44 - $25.91
Q1 2015	486,979	$11,786	$25.43	$23.99 - $27.53
Q4 2014	476,953	$11,686	$23.29	$18.60 - $26.74
Q3 2014	497,913	$11,004	$23.53	$21.86 - $27.54
Q2 2014	525,052	$14,339	$29.00	$26.37 - $32.20
Q1 2014	562,971	$17,468	$27.62	$22.00 - $35.61
Q4 2013	611,865	$15,027	$20.94	$15.03 - $25.16
Q3 2013	594,800	$10,790	$22.78	$17.64 - $25.70
Q2 2013	237,514	$5,660	$24.24	$18.00 - $27.25