Aldeyra Therapeutics, Inc. - Common Stock, $0.001 par value per share (ALDX)

Q: What does CUSIP 01438T106 represent in this 13F holders report?

CUSIP 01438T106 is the security identifier for ALDX - Aldeyra Therapeutics, Inc. - Common Stock, $0.001 par value per share used to aggregate holder disclosures.

Q: How many institutions held ALDX - Aldeyra Therapeutics, Inc. - Common Stock, $0.001 par value per share in Q1 2021?

107 institutional investors reported ALDX - Aldeyra Therapeutics, Inc. - Common Stock, $0.001 par value per share for Q1 2021. Use the holders table for investor-level position and value details.

CUSIP: 01438T106

Q1 2021 13F Holders as of 31 Mar 2021

Security type / class: Equity / Common Stock, $0.001 par value per share
Total 13F shares: 31,692,851
Total 13F value: $376,513,639
Share change: +9,598,032
Put/Call ratio: 126%
SEC-reported price per share: $11.88
Number of holders: 107
Value change: +$122,609,589
Number of buys: 61
Number of sells: 43
Shares outstanding: 60,314,437

Security key

01438T106

Report period

Q1 2021

Institutions

107

Top holders

ALDX full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2026 Aldeyra Therapeutics, Inc. SEC filings Aldeyra Therapeutics, Inc. company facts

Broader feeds

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

Reporting periods

Holder history for CUSIP 01438T106

Newer quarter: Q3 2026

Recent filing periods:

Q3 2026

Ownership snapshot

Top reported holders of ALDX - Aldeyra Therapeutics, Inc. - Common Stock, $0.001 par value 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

PERCEPTIVE ADVISORS LLC

Disclosed value leader

PERCEPTIVE ADVISORS LLC

Comparable rows

0/15

Latest evidence

31 Dec 2020

13F Highest disclosed value: $43,118,000 15 rows are not safely comparable across share classes. Showing 1-6 of 15 holder rows.

Quick read

PERCEPTIVE ADVISORS LLC has the largest disclosed position value at $43.12M.

0 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 PERCEPTIVE ADVISORS LLC's linked filing trail.

Disclosed position value Top 5

PERCEPTIVE ADVISORS LLC $43.12M

VANGUARD GROUP INC $11.09M

Avidity Partners Management LP $9.84M

CITADEL ADVISORS LLC $9.09M

Prosight Management, LP $6.23M

Value bars compare disclosed positions; verify each figure against the linked filing evidence.

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

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
PERCEPTIVE ADVISORS LLC	13F Company 13F	— denominator unverified	$43,118,000 6,285,458 shares	—	31 Dec 2020
VANGUARD GROUP INC	13F Company 13F	— denominator unverified	$11,086,000 1,616,005 shares	—	31 Dec 2020
Avidity Partners Management LP	13F Company 13F	— denominator unverified	$9,844,000 1,435,000 shares	—	31 Dec 2020
CITADEL ADVISORS LLC	13F Company 13F	— denominator unverified	$9,094,000 1,325,687 shares	—	31 Dec 2020
Prosight Management, LP	13F Company 13F	— denominator unverified	$6,232,000 908,488 shares	—	31 Dec 2020
Point72 Asset Management, L.P.	13F Company 13F	— denominator unverified	$5,888,000 858,270 shares	—	31 Dec 2020

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 Q1 2021

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

Institutions

107

31,692,851

Rows available

107

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 Q1 2021 vs Q1 2021 Across Filers

Q1 2021 holders

107

Q1 2021 holders

107

Holder diff

Investor	Q1 2021 Shares	Q1 2021 Shares	Share Diff	Share Chg %	Q1 2021 value	Q1 2021 value	Value change	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend