ANNEXON INC

Ticker: ANNX CUSIP: 03589W102 Class: COM

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

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

Q4 2025

Shares 583,913 Value ($000) $2,931 Avg Close $3.82 Range $2.54 - $5.48

Q3 2025

Shares 583,913 Value ($000) $1,781 Avg Close $2.48 Range $1.85 - $3.42

Q2 2025

Shares 583,913 Value ($000) $1,401 Avg Close $2.00 Range $1.28 - $2.82

Q1 2025

Shares 583,913 Value ($000) $1,127 Avg Close $3.33 Range $1.93 - $5.66

Q4 2024

Shares 583,913 Value ($000) $2,995 Avg Close $6.15 Range $4.40 - $7.85

Q3 2024

Shares 583,913 Value ($000) $3,457 Avg Close $5.93 Range $4.45 - $7.31

Q2 2024

Shares 583,913 Value ($000) $2,861 Avg Close $5.17 Range $4.20 - $7.44

Q1 2024

Shares 583,913 Value ($000) $4,187 Avg Close $5.19 Range $3.86 - $8.40

Q4 2023

Shares 583,913 Value ($000) $2,651 Avg Close $2.47 Range $1.57 - $5.15

Q3 2023

Shares 583,913 Value ($000) $1,378 Avg Close $3.02 Range $2.11 - $3.98

Q2 2023

Shares 583,913 Value ($000) $2,055 Avg Close $4.37 Range $2.07 - $6.67

Q1 2023

Shares 583,913 Value ($000) $2,248 Avg Close $5.50 Range $3.64 - $7.65

Q4 2022

Shares 583,913 Value ($000) $3,019 Avg Close $5.49 Range $4.42 - $6.74

Q3 2022

Shares 583,913 Value ($000) $3,609 Avg Close $5.41 Range $3.68 - $6.90

Q2 2022

Shares 583,913 Value ($000) $2,201 Avg Close $3.06 Range $2.06 - $4.15

Q1 2022

Shares 583,913 Value ($000) $1,594 Avg Close $6.15 Range $2.68 - $11.95

Q4 2021

Shares 583,913 Value ($000) $6,709 Avg Close $16.16 Range $11.34 - $22.34

Q3 2021

Shares 583,913 Value ($000) $10,867 Avg Close $20.29 Range $15.52 - $23.84

Q2 2021

Shares 583,913 Value ($000) $13,144 Avg Close $22.16 Range $17.27 - $28.31

Q1 2021

Shares 583,913 Value ($000) $16,256 Avg Close $27.50 Range $21.55 - $38.01

Q4 2020

Shares 1,167,826 Value ($000) $29,231 Avg Close $25.74 Range $20.57 - $31.94

Q3 2020

Shares 1,617,826 Value ($000) $48,907 Avg Close $23.46 Range $15.33 - $30.69

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	583,913	$2,931	$3.82	$2.54 - $5.48
Q3 2025	583,913	$1,781	$2.48	$1.85 - $3.42
Q2 2025	583,913	$1,401	$2.00	$1.28 - $2.82
Q1 2025	583,913	$1,127	$3.33	$1.93 - $5.66
Q4 2024	583,913	$2,995	$6.15	$4.40 - $7.85
Q3 2024	583,913	$3,457	$5.93	$4.45 - $7.31
Q2 2024	583,913	$2,861	$5.17	$4.20 - $7.44
Q1 2024	583,913	$4,187	$5.19	$3.86 - $8.40
Q4 2023	583,913	$2,651	$2.47	$1.57 - $5.15
Q3 2023	583,913	$1,378	$3.02	$2.11 - $3.98
Q2 2023	583,913	$2,055	$4.37	$2.07 - $6.67
Q1 2023	583,913	$2,248	$5.50	$3.64 - $7.65
Q4 2022	583,913	$3,019	$5.49	$4.42 - $6.74
Q3 2022	583,913	$3,609	$5.41	$3.68 - $6.90
Q2 2022	583,913	$2,201	$3.06	$2.06 - $4.15
Q1 2022	583,913	$1,594	$6.15	$2.68 - $11.95
Q4 2021	583,913	$6,709	$16.16	$11.34 - $22.34
Q3 2021	583,913	$10,867	$20.29	$15.52 - $23.84
Q2 2021	583,913	$13,144	$22.16	$17.27 - $28.31
Q1 2021	583,913	$16,256	$27.50	$21.55 - $38.01
Q4 2020	1,167,826	$29,231	$25.74	$20.57 - $31.94
Q3 2020	1,617,826	$48,907	$23.46	$15.33 - $30.69