SYNDAX PHARMACEUTICALS INC

Ticker: SNDX CUSIP: 87164F105 Class: Common Stock

FMR LLC's Holding History (CIK: 0000315066)

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

Q4 2025

Shares 140,560 Value ($000) $2,953 Avg Close $17.45 Range $12.99 - $22.73

Q3 2025

Shares 5,101 Value ($000) $78 Avg Close $13.09 Range $8.59 - $17.24

Q2 2025

Shares 160,918 Value ($000) $1,507 Avg Close $11.01 Range $8.58 - $14.24

Q1 2025

Shares 122,258 Value ($000) $1,502 Avg Close $14.10 Range $12.06 - $16.95

Q4 2024

Shares 85,201 Value ($000) $1,126 Avg Close $17.11 Range $12.40 - $22.50

Q3 2024

Shares 49,248 Value ($000) $948 Avg Close $20.66 Range $17.34 - $25.07

Q2 2024

Shares 36,871 Value ($000) $757 Avg Close $20.93 Range $18.65 - $24.38

Q1 2024

Shares 34,070 Value ($000) $811 Avg Close $22.30 Range $19.58 - $25.34

Q4 2023

Shares 40,696 Value ($000) $879 Avg Close $15.37 Range $11.21 - $21.84

Q3 2023

Shares 43,982 Value ($000) $639 Avg Close $18.92 Range $12.85 - $23.55

Q2 2023

Shares 41,745 Value ($000) $874 Avg Close $20.82 Range $19.27 - $23.14

Q1 2023

Shares 41,541 Value ($000) $877 Avg Close $24.88 Range $20.01 - $29.86

Q4 2022

Shares 41,224 Value ($000) $1,049 Avg Close $23.32 Range $20.25 - $26.51

Q3 2022

Shares 165,873 Value ($000) $3,986 Avg Close $22.44 Range $18.05 - $25.71

Q2 2022

Shares 125,656 Value ($000) $2,418 Avg Close $16.66 Range $13.27 - $19.91

Q1 2022

Shares 188,743 Value ($000) $3,280 Avg Close $16.84 Range $14.56 - $22.27

Q4 2021

Shares 187,349 Value ($000) $4,101 Avg Close $18.48 Range $14.76 - $22.71

Q3 2018

Shares 348,653 Value ($000) $2,817 Avg Close $7.13 Range $6.10 - $8.24

Q2 2018

Shares 560,202 Value ($000) $3,933 Avg Close $9.81 Range $6.61 - $15.20

Q1 2018

Shares 560,202 Value ($000) $7,972 Avg Close $10.61 Range $8.44 - $14.96

Q4 2017

Shares 702,844 Value ($000) $6,157 Avg Close $9.90 Range $7.70 - $13.48

Q3 2017

Shares 1,097,551 Value ($000) $12,841 Avg Close $12.26 Range $10.56 - $14.17

Q2 2017

Shares 1,341,644 Value ($000) $18,743 Avg Close $11.43 Range $7.41 - $15.43

Q1 2017

Shares 1,250,316 Value ($000) $17,154 Avg Close $10.38 Range $6.31 - $15.70

Q4 2016

Shares 1,480,047 Value ($000) $10,612 Avg Close $10.96 Range $6.69 - $16.40

Q3 2016

Shares 2,094,464 Value ($000) $31,752 Avg Close $13.15 Range $9.60 - $18.03

Q2 2016

Shares 2,094,464 Value ($000) $20,630 Avg Close $13.71 Range $8.97 - $17.49

Q1 2016

Shares 2,094,464 Value ($000) $27,898 Avg Close $12.54 Range $10.60 - $16.30

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	140,560	$2,953	$17.45	$12.99 - $22.73
Q3 2025	5,101	$78	$13.09	$8.59 - $17.24
Q2 2025	160,918	$1,507	$11.01	$8.58 - $14.24
Q1 2025	122,258	$1,502	$14.10	$12.06 - $16.95
Q4 2024	85,201	$1,126	$17.11	$12.40 - $22.50
Q3 2024	49,248	$948	$20.66	$17.34 - $25.07
Q2 2024	36,871	$757	$20.93	$18.65 - $24.38
Q1 2024	34,070	$811	$22.30	$19.58 - $25.34
Q4 2023	40,696	$879	$15.37	$11.21 - $21.84
Q3 2023	43,982	$639	$18.92	$12.85 - $23.55
Q2 2023	41,745	$874	$20.82	$19.27 - $23.14
Q1 2023	41,541	$877	$24.88	$20.01 - $29.86
Q4 2022	41,224	$1,049	$23.32	$20.25 - $26.51
Q3 2022	165,873	$3,986	$22.44	$18.05 - $25.71
Q2 2022	125,656	$2,418	$16.66	$13.27 - $19.91
Q1 2022	188,743	$3,280	$16.84	$14.56 - $22.27
Q4 2021	187,349	$4,101	$18.48	$14.76 - $22.71
Q3 2018	348,653	$2,817	$7.13	$6.10 - $8.24
Q2 2018	560,202	$3,933	$9.81	$6.61 - $15.20
Q1 2018	560,202	$7,972	$10.61	$8.44 - $14.96
Q4 2017	702,844	$6,157	$9.90	$7.70 - $13.48
Q3 2017	1,097,551	$12,841	$12.26	$10.56 - $14.17
Q2 2017	1,341,644	$18,743	$11.43	$7.41 - $15.43
Q1 2017	1,250,316	$17,154	$10.38	$6.31 - $15.70
Q4 2016	1,480,047	$10,612	$10.96	$6.69 - $16.40
Q3 2016	2,094,464	$31,752	$13.15	$9.60 - $18.03
Q2 2016	2,094,464	$20,630	$13.71	$8.97 - $17.49
Q1 2016	2,094,464	$27,898	$12.54	$10.60 - $16.30