PROTHENA CORP PLC

Ticker: PRTA CUSIP: G72800108 Class: Common Stock

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

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

Q4 2025

Shares 363,241 Value ($000) $3,469 Avg Close $10.18 Range $9.07 - $11.69

Q3 2025

Shares 334,657 Value ($000) $3,266 Avg Close $7.69 Range $5.96 - $9.85

Q2 2025

Shares 334,554 Value ($000) $2,031 Avg Close $7.50 Range $4.32 - $12.45

Q1 2025

Shares 373,703 Value ($000) $4,625 Avg Close $14.14 Range $11.78 - $16.66

Q4 2024

Shares 404,496 Value ($000) $5,602 Avg Close $15.77 Range $11.70 - $18.88

Q3 2024

Shares 372,655 Value ($000) $6,235 Avg Close $21.50 Range $15.52 - $25.42

Q2 2024

Shares 364,106 Value ($000) $7,515 Avg Close $21.64 Range $18.69 - $26.36

Q1 2024

Shares 397,263 Value ($000) $9,840 Avg Close $29.75 Range $24.25 - $41.55

Q4 2023

Shares 404,110 Value ($000) $14,685 Avg Close $38.49 Range $28.51 - $55.89

Q3 2023

Shares 409,847 Value ($000) $19,775 Avg Close $59.41 Range $45.22 - $73.14

Q2 2023

Shares 411,975 Value ($000) $28,130 Avg Close $64.50 Range $47.45 - $79.65

Q1 2023

Shares 382,688 Value ($000) $18,549 Avg Close $52.83 Range $45.06 - $60.82

Q4 2022

Shares 361,585 Value ($000) $21,785 Avg Close $58.56 Range $50.89 - $66.47

Q3 2022

Shares 347,148 Value ($000) $21,048 Avg Close $31.61 Range $25.02 - $64.00

Q2 2022

Shares 352,221 Value ($000) $9,563 Avg Close $29.25 Range $21.06 - $40.31

Q1 2022

Shares 364,792 Value ($000) $13,339 Avg Close $36.05 Range $29.53 - $49.77

Q4 2021

Shares 444,819 Value ($000) $21,974 Avg Close $55.45 Range $40.50 - $74.32

Q3 2021

Shares 440,985 Value ($000) $31,411 Avg Close $62.11 Range $45.09 - $79.75

Q2 2021

Shares 441,284 Value ($000) $22,687 Avg Close $31.20 Range $21.30 - $59.74

Q1 2021

Shares 341,275 Value ($000) $8,573 Avg Close $18.81 Range $10.72 - $28.66

Q4 2020

Shares 370,160 Value ($000) $4,445 Avg Close $11.83 Range $9.86 - $14.14

Q3 2020

Shares 386,627 Value ($000) $3,863 Avg Close $12.03 Range $9.67 - $13.78

Q2 2020

Shares 431,341 Value ($000) $4,512 Avg Close $11.11 Range $9.25 - $12.98

Q1 2020

Shares 514,846 Value ($000) $5,509 Avg Close $12.11 Range $7.10 - $16.05

Q4 2019

Shares 514,866 Value ($000) $8,150 Avg Close $10.72 Range $7.40 - $17.63

Q3 2019

Shares 494,050 Value ($000) $3,873 Avg Close $8.88 Range $6.71 - $10.70

Q2 2019

Shares 520,811 Value ($000) $5,504 Avg Close $10.27 Range $8.67 - $12.54

Q1 2019

Shares 485,034 Value ($000) $5,883 Avg Close $12.49 Range $9.97 - $14.77

Q4 2018

Shares 486,124 Value ($000) $5,007 Avg Close $11.89 Range $8.63 - $13.83

Q3 2018

Shares 495,260 Value ($000) $6,478 Avg Close $14.44 Range $12.23 - $15.91

Q2 2018

Shares 459,242 Value ($000) $6,696 Avg Close $19.75 Range $10.43 - $44.75

Q1 2018

Shares 459,281 Value ($000) $16,859 Avg Close $36.37 Range $27.19 - $46.14

Q4 2017

Shares 456,298 Value ($000) $17,106 Avg Close $50.91 Range $34.85 - $64.96

Q3 2017

Shares 457,834 Value ($000) $29,653 Avg Close $61.26 Range $52.91 - $70.00

Q2 2017

Shares 402,811 Value ($000) $21,801 Avg Close $53.29 Range $48.23 - $59.10

Q1 2017

Shares 422,491 Value ($000) $23,572 Avg Close $52.54 Range $45.13 - $63.14

Q4 2016

Shares 395,428 Value ($000) $19,452 Avg Close $55.18 Range $40.58 - $68.18

Q3 2016

Shares 392,812 Value ($000) $23,557 Avg Close $53.65 Range $35.04 - $64.50

Q2 2016

Shares 394,350 Value ($000) $13,786 Avg Close $43.55 Range $33.53 - $51.45

Q1 2016

Shares 386,001 Value ($000) $15,887 Avg Close $39.14 Range $28.20 - $67.32

Q4 2015

Shares 352,971 Value ($000) $24,041 Avg Close $60.32 Range $40.47 - $76.42

Q3 2015

Shares 488,340 Value ($000) $22,141 Avg Close $58.24 Range $42.20 - $70.52

Q2 2015

Shares 484,021 Value ($000) $25,493 Avg Close $39.47 Range $30.14 - $55.97

Q1 2015

Shares 424,632 Value ($000) $16,194 Avg Close $25.65 Range $18.76 - $45.00

Q4 2014

Shares 410,417 Value ($000) $8,520 Avg Close $20.87 Range $17.00 - $24.67

Q3 2014

Shares 395,801 Value ($000) $8,770 Avg Close $21.20 Range $16.71 - $24.31

Q2 2014

Shares 180,558 Value ($000) $4,071 Avg Close $25.01 Range $18.52 - $41.33

Q1 2014

Shares 191,702 Value ($000) $7,344 Avg Close $32.24 Range $24.42 - $49.24

Q4 2013

Shares 197,770 Value ($000) $5,244 Avg Close $25.08 Range $18.93 - $30.55

Q3 2013

Shares 153,705 Value ($000) $3,109 Avg Close $17.69 Range $12.14 - $22.48

Q2 2013

Shares 53,437 Value ($000) $691 Avg Close $9.30 Range $6.49 - $14.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	363,241	$3,469	$10.18	$9.07 - $11.69
Q3 2025	334,657	$3,266	$7.69	$5.96 - $9.85
Q2 2025	334,554	$2,031	$7.50	$4.32 - $12.45
Q1 2025	373,703	$4,625	$14.14	$11.78 - $16.66
Q4 2024	404,496	$5,602	$15.77	$11.70 - $18.88
Q3 2024	372,655	$6,235	$21.50	$15.52 - $25.42
Q2 2024	364,106	$7,515	$21.64	$18.69 - $26.36
Q1 2024	397,263	$9,840	$29.75	$24.25 - $41.55
Q4 2023	404,110	$14,685	$38.49	$28.51 - $55.89
Q3 2023	409,847	$19,775	$59.41	$45.22 - $73.14
Q2 2023	411,975	$28,130	$64.50	$47.45 - $79.65
Q1 2023	382,688	$18,549	$52.83	$45.06 - $60.82
Q4 2022	361,585	$21,785	$58.56	$50.89 - $66.47
Q3 2022	347,148	$21,048	$31.61	$25.02 - $64.00
Q2 2022	352,221	$9,563	$29.25	$21.06 - $40.31
Q1 2022	364,792	$13,339	$36.05	$29.53 - $49.77
Q4 2021	444,819	$21,974	$55.45	$40.50 - $74.32
Q3 2021	440,985	$31,411	$62.11	$45.09 - $79.75
Q2 2021	441,284	$22,687	$31.20	$21.30 - $59.74
Q1 2021	341,275	$8,573	$18.81	$10.72 - $28.66
Q4 2020	370,160	$4,445	$11.83	$9.86 - $14.14
Q3 2020	386,627	$3,863	$12.03	$9.67 - $13.78
Q2 2020	431,341	$4,512	$11.11	$9.25 - $12.98
Q1 2020	514,846	$5,509	$12.11	$7.10 - $16.05
Q4 2019	514,866	$8,150	$10.72	$7.40 - $17.63
Q3 2019	494,050	$3,873	$8.88	$6.71 - $10.70
Q2 2019	520,811	$5,504	$10.27	$8.67 - $12.54
Q1 2019	485,034	$5,883	$12.49	$9.97 - $14.77
Q4 2018	486,124	$5,007	$11.89	$8.63 - $13.83
Q3 2018	495,260	$6,478	$14.44	$12.23 - $15.91
Q2 2018	459,242	$6,696	$19.75	$10.43 - $44.75
Q1 2018	459,281	$16,859	$36.37	$27.19 - $46.14
Q4 2017	456,298	$17,106	$50.91	$34.85 - $64.96
Q3 2017	457,834	$29,653	$61.26	$52.91 - $70.00
Q2 2017	402,811	$21,801	$53.29	$48.23 - $59.10
Q1 2017	422,491	$23,572	$52.54	$45.13 - $63.14
Q4 2016	395,428	$19,452	$55.18	$40.58 - $68.18
Q3 2016	392,812	$23,557	$53.65	$35.04 - $64.50
Q2 2016	394,350	$13,786	$43.55	$33.53 - $51.45
Q1 2016	386,001	$15,887	$39.14	$28.20 - $67.32
Q4 2015	352,971	$24,041	$60.32	$40.47 - $76.42
Q3 2015	488,340	$22,141	$58.24	$42.20 - $70.52
Q2 2015	484,021	$25,493	$39.47	$30.14 - $55.97
Q1 2015	424,632	$16,194	$25.65	$18.76 - $45.00
Q4 2014	410,417	$8,520	$20.87	$17.00 - $24.67
Q3 2014	395,801	$8,770	$21.20	$16.71 - $24.31
Q2 2014	180,558	$4,071	$25.01	$18.52 - $41.33
Q1 2014	191,702	$7,344	$32.24	$24.42 - $49.24
Q4 2013	197,770	$5,244	$25.08	$18.93 - $30.55
Q3 2013	153,705	$3,109	$17.69	$12.14 - $22.48
Q2 2013	53,437	$691	$9.30	$6.49 - $14.00