Syndax Pharmaceuticals Inc - Common Stock, par value $0.0001 per share (SNDX)

Q: What does CUSIP 87164F105 represent in this 13F holders report?

CUSIP 87164F105 is the security identifier for SNDX - Syndax Pharmaceuticals Inc - Common Stock, par value $0.0001 per share used to aggregate holder disclosures.

Q: How many institutions held SNDX - Syndax Pharmaceuticals Inc - Common Stock, par value $0.0001 per share in Q4 2021?

129 institutional investors reported SNDX - Syndax Pharmaceuticals Inc - Common Stock, par value $0.0001 per share for Q4 2021. Use the holders table for investor-level position and value details.

CUSIP: 87164F105

Q4 2021 13F Holders as of 31 Dec 2021

Security type / class: Equity / Common Stock, par value $0.0001 per share
Total 13F shares: 52,428,774
Total 13F value: $1,146,955,026
Share change: +1,884,226
Put/Call ratio: 14%
SEC-reported price per share: $21.89
Number of holders: 129
Value change: +$54,297,905
Number of buys: 65
Number of sells: 52
Shares outstanding: 86,328,130

Security key

87164F105

Report period

Q4 2021

Institutions

129

Top holders

SNDX full security history Ownership snapshot Full 13F holder table Newer quarter: Q1 2022 Previous quarter: Q3 2021 Syndax Pharmaceuticals Inc SEC filings Syndax Pharmaceuticals Inc company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 87164F105

Newer quarter: Q1 2022 Previous quarter: Q3 2021

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Ownership snapshot

Top reported holders of SNDX - Syndax Pharmaceuticals Inc - Common Stock, par value $0.0001 per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Avidity Partners Manageme...

Disclosed value leader

Avidity Partners Manageme...

Comparable rows

15/15

Latest evidence

30 Sep 2021

13F Lead comparable stake: 5.6% Showing 1-6 of 15 holder rows.

Quick read

Avidity Partners Management LP leads the comparable SEC ownership view at 5.6%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Avidity Partners Management LP's linked filing trail.

Comparable ownership Top 5

Avidity Partners Management LP 5.6%

BlackRock Finance, Inc. 4.1%

ADAGE CAPITAL PARTNERS GP, L.L.C. 3.3%

Nantahala Capital Management, LLC 3.1%

BVF INC/IL 2.9%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Avidity Partners Management LP	13F Company 13F	5.6%	$92,175,000 4,823,400 shares	—	30 Sep 2021
BlackRock Finance, Inc.	13F Company 13F	4.1%	$67,389,000 3,526,298 shares	—	30 Sep 2021
ADAGE CAPITAL PARTNERS GP, L.L.C.	13F Company 13F	3.3%	$54,774,000 2,866,272 shares	—	30 Sep 2021
Nantahala Capital Management, LLC	13F Company 13F	3.1%	$50,778,000 2,657,159 shares	—	30 Sep 2021
BVF INC/IL	13F Company 13F	2.9%	$47,516,000 2,486,429 shares	—	30 Sep 2021
Boxer Capital, LLC	13F Company 13F	2.7%	$43,720,000 2,287,782 shares	—	30 Sep 2021

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2021

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

129

52,428,774

Rows available

129

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q4 2021 vs Q3 2021 Across Filers

Q3 2021 holders

121

Q4 2021 holders

129

Holder diff

Investor	Q3 2021 Shares	Q4 2021 Shares	Share Diff	Share Chg %	Q3 2021 value	Q4 2021 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend