What does CUSIP 46333X108 represent in this 13F holders report?

CUSIP 46333X108 is the security identifier for IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock used to aggregate holder disclosures.

How many institutions held IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock in Q1 2021?

202 institutional investors reported IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock for Q1 2021. Use the holders table for investor-level position and value details.

IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD)

CUSIP: 46333X108

Q1 2021 13F Holders as of 31 Mar 2021

Type / Class: Equity / Class A Common Stock
Shares outstanding: 163,317,295
Total 13F shares: 171,145,457
Share change: -796,590
Total reported value: $1,913,286,723
Put/Call ratio: 91%
Price per share: $11.18
Number of holders: 202
Value change: -$10,293,889
Number of buys: 107
Number of sells: 91

Security key

46333X108

Report period

Q1 2021

Institutions

202

Top holders

IRWD full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2021 Previous quarter: Q4 2020 IRONWOOD PHARMACEUTICALS INC SEC filings IRONWOOD PHARMACEUTICALS INC company facts

Broader feeds

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

Reporting periods

Holder history for CUSIP 46333X108

Newer quarter: Q2 2021 Previous quarter: Q4 2020

Recent filing periods:

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

Ownership snapshot

Top shareholders of IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (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.

Lead holder

WELLINGTON MANAGEMENT GRO...

13D/G signal

—

Evidence rows

Latest as of

31 Dec 2020

13F Lead comparable stake: 13% Showing first 8 of 50 holder rows. Open remaining rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
WELLINGTON MANAGEMENT GROUP LLP	13F Company 13F	13%	$246,226,000 21,617,713 shares	—	31 Dec 2020
BROWN CAPITAL MANAGEMENT LLC	13F Company 13F	12%	$229,514,000 20,150,463 shares	—	31 Dec 2020
VANGUARD GROUP INC	13F Company 13F	9.7%	$181,015,000 15,892,347 shares	—	31 Dec 2020
Sarissa Capital Management LP	13F Company 13F	8.6%	$159,915,000 14,040,000 shares	—	31 Dec 2020
BlackRock Finance, Inc.	13F Company 13F	8%	$148,580,000 13,044,650 shares	—	31 Dec 2020
WESTFIELD CAPITAL MANAGEMENT CO LP	13F Company 13F	5.2%	$96,679,000 8,488,042 shares	—	31 Dec 2020
STATE STREET CORP	13F Company 13F	4.6%	$86,386,000 7,584,369 shares	—	31 Dec 2020
Camber Capital Management LP	13F Company 13F	4.6%	$85,425,000 7,500,000 shares	—	31 Dec 2020

Show 42 additional holder rows in the full holder list

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
CREDIT SUISSE AG/	13F Company 13F	2.3%	$43,639,000 3,831,351 shares	—	31 Dec 2020
PUTNAM INVESTMENTS LLC	13F Company 13F	2.1%	$38,140,000 3,348,532 shares	—	31 Dec 2020
GEODE CAPITAL MANAGEMENT, LLC	13F Company 13F	1.5%	$28,181,000 2,474,244 shares	—	31 Dec 2020
BRIDGER MANAGEMENT, LLC	13F Company 13F	1.5%	$28,099,000 2,466,972 shares	—	31 Dec 2020
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F Company 13F	1.5%	$27,840,156 2,444,263 shares	—	31 Dec 2020
NEW YORK STATE COMMON RETIREMENT FUND	13F Company 13F	1.5%	$27,095,000 2,378,882 shares	—	31 Dec 2020
D. E. Shaw & Co., Inc.	13F Company 13F	1.3%	$24,366,000 2,139,227 shares	—	31 Dec 2020
NORGES BANK	13F Company 13F	1.3%	$23,377,000 2,052,390 shares	—	31 Dec 2020
Capital World Investors	13F Company 13F	1.2%	$23,122,000 2,030,000 shares	—	31 Dec 2020
RENAISSANCE TECHNOLOGIES LLC	13F Company 13F	1.2%	$22,846,000 2,005,753 shares	—	31 Dec 2020
NORTHERN TRUST CORP	13F Company 13F	1.2%	$22,512,000 1,976,431 shares	—	31 Dec 2020
Man Group plc	13F Company 13F	1.1%	$19,567,000 1,717,971 shares	—	31 Dec 2020
Atom Investors LP	13F Company 13F	0.8%	$14,913,000 1,309,331 shares	—	31 Dec 2020
DIMENSIONAL FUND ADVISORS LP	13F Company 13F	0.8%	$14,892,000 1,307,399 shares	—	31 Dec 2020
FMR LLC	13F Company 13F	0.8%	$14,817,000 1,300,888 shares	—	31 Dec 2020
MORGAN STANLEY	13F Company 13F	0.78%	$14,449,000 1,268,521 shares	—	31 Dec 2020
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F Company 13F	0.71%	$13,150,000 1,154,446 shares	—	31 Dec 2020
PEREGRINE CAPITAL MANAGEMENT LLC	13F Company 13F	0.63%	$11,662,000 1,023,882 shares	—	31 Dec 2020
Park West Asset Management LLC	13F Company 13F	0.58%	$10,857,000 953,191 shares	—	31 Dec 2020
Nuveen Asset Management, LLC	13F Company 13F	0.53%	$9,906,000 869,737 shares	—	31 Dec 2020
MILLENNIUM MANAGEMENT LLC	13F Company 13F	0.52%	$9,762,000 857,035 shares	—	31 Dec 2020
Atle Fund Management AB	13F Company 13F	0.51%	$9,511,000 835,000 shares	—	31 Dec 2020
GLENMEDE TRUST CO NA	13F Company 13F	0.5%	$9,241,000 811,463 shares	—	31 Dec 2020
Bank of New York Mellon Corp	13F Company 13F	0.5%	$9,241,000 811,376 shares	—	31 Dec 2020
PICTET ASSET MANAGEMENT LTD	13F Company 13F	0.48%	$9,018,000 791,716 shares	—	31 Dec 2020
Islet Management, LP	13F Company 13F	0.43%	$7,973,000 700,000 shares	—	31 Dec 2020
TWO SIGMA INVESTMENTS, LP	13F Company 13F	0.42%	$7,893,000 692,955 shares	—	31 Dec 2020
ACADIAN ASSET MANAGEMENT LLC	13F Company 13F	0.42%	$7,800,000 684,891 shares	—	31 Dec 2020
Skandinaviska Enskilda Banken AB (publ)	13F Company 13F	0.42%	$7,778,000 682,900 shares	—	31 Dec 2020
TWO SIGMA ADVISERS, LP	13F Company 13F	0.39%	$7,208,000 632,857 shares	—	31 Dec 2020
Point72 Asset Management, L.P.	13F Company 13F	0.38%	$7,063,000 620,139 shares	—	31 Dec 2020
TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY	13F Company 13F	0.37%	$6,801,000 597,090 shares	—	31 Dec 2020
Invesco Ltd.	13F Company 13F	0.36%	$6,629,000 581,959 shares	—	31 Dec 2020
JPMORGAN CHASE & CO	13F Company 13F	0.31%	$5,749,000 504,681 shares	—	31 Dec 2020
FEDERATED HERMES, INC.	13F Company 13F	0.31%	$5,727,000 502,747 shares	—	31 Dec 2020
Michael F. Price	13F Individual 13F	0.31%	$5,716,000 501,874 shares	—	31 Dec 2020
JUPITER ASSET MANAGEMENT LTD	13F Company 13F	0.26%	$4,806,000 422,348 shares	—	31 Dec 2020
WELLS FARGO & COMPANY/MN	13F Company 13F	0.25%	$4,615,000 405,145 shares	—	31 Dec 2020
BARCLAYS PLC	13F Company 13F	0.23%	$4,297,000 377,228 shares	—	31 Dec 2020
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	13F Company 13F	0.23%	$4,266,000 374,569 shares	—	31 Dec 2020
13D Management LLC	13F Company 13F	0.23%	$4,220,000 370,435 shares	—	31 Dec 2020
ExodusPoint Capital Management, LP	13F Company 13F	0.22%	$4,180,000 366,972 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

202

171,145,457

Rows loaded

202

Investor	Option	Weight %	Change %	Reported value	* Price	Shares	Share Change	Activity	Report Period

* 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. An asterisk next to the price means the price is likely invalid.

Compare Q1 2021 vs Q4 2020 Across Filers

Q4 2020 holders

191

Q1 2021 holders

202

Holder diff

Investor	Q4 2020 Shares	Q1 2021 Shares	Share Diff	Share Chg %	Q4 2020 value	Q1 2021 value	Value change	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend