IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD)

Q: 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, $0.001 par value used to aggregate holder disclosures.

Q: How many institutions held IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value in Q1 2021?

202 institutional investors reported IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value for Q1 2021. Use the holders table for investor-level position and value details.

CUSIP: 46333X108

Q1 2021 13F Holders as of 31 Mar 2021

Type / Class: Equity / Class A Common Stock, $0.001 par value
Shares outstanding: 162,843,862
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

Quarterly Holders Quick Answers

What is CUSIP 46333X108?
CUSIP 46333X108 identifies IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value in SEC institutional holdings data.

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Related Filing Research

Latest 13F filings for newly reported positions.
Latest Schedule 13D/13G reports for ownership changes outside 13F cadence.
Latest 10-Q/10-K reports for financial context tied to this issuer.
Recent insider transactions for executive and insider activity.
SEC investors directory and top value investors for manager drilldown.
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Explore More Reporting Periods

Jump to adjacent filing periods for faster comparison and easier crawl discovery.

Newer quarter: Q2 2021
Previous quarter: Q4 2020

Recent filing periods for CUSIP 46333X108:

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

Top shareholders of IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
WELLINGTON MANAGEMENT GROUP LLP	13F	Company	13%	21,617,713	$246,226,000	—	31 Dec 2020	13F
BROWN CAPITAL MANAGEMENT LLC	13F	Company	12%	20,150,463	$229,514,000	—	31 Dec 2020	13F
VANGUARD GROUP INC	13F	Company	9.8%	15,892,347	$181,015,000	—	31 Dec 2020	13F
Sarissa Capital Management LP	13F	Company	8.6%	14,040,000	$159,915,000	—	31 Dec 2020	13F
BlackRock Finance, Inc.	13F	Company	8%	13,044,650	$148,580,000	—	31 Dec 2020	13F
WESTFIELD CAPITAL MANAGEMENT CO LP	13F	Company	5.2%	8,488,042	$96,679,000	—	31 Dec 2020	13F
STATE STREET CORP	13F	Company	4.7%	7,584,369	$86,386,000	—	31 Dec 2020	13F
Camber Capital Management LP	13F	Company	4.6%	7,500,000	$85,425,000	—	31 Dec 2020	13F
CREDIT SUISSE AG/	13F	Company	2.4%	3,831,351	$43,639,000	—	31 Dec 2020	13F
PUTNAM INVESTMENTS LLC	13F	Company	2.1%	3,348,532	$38,140,000	—	31 Dec 2020	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	1.5%	2,474,244	$28,181,000	—	31 Dec 2020	13F
BRIDGER MANAGEMENT, LLC	13F	Company	1.5%	2,466,972	$28,099,000	—	31 Dec 2020	13F
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F	Company	1.5%	2,444,263	$27,840,156	—	31 Dec 2020	13F
NEW YORK STATE COMMON RETIREMENT FUND	13F	Company	1.5%	2,378,882	$27,095,000	—	31 Dec 2020	13F
GOLDMAN SACHS GROUP INC	13F	Company	— mixed-class rows	2,173,391 mixed-class rows	$24,683,000	—	31 Dec 2020	13F
D. E. Shaw & Co., Inc.	13F	Company	1.3%	2,139,227	$24,366,000	—	31 Dec 2020	13F
NORGES BANK	13F	Company	1.3%	2,052,390	$23,377,000	—	31 Dec 2020	13F
Capital World Investors	13F	Company	1.2%	2,030,000	$23,122,000	—	31 Dec 2020	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	1.2%	2,005,753	$22,846,000	—	31 Dec 2020	13F
NORTHERN TRUST CORP	13F	Company	1.2%	1,976,431	$22,512,000	—	31 Dec 2020	13F
Man Group plc	13F	Company	1.1%	1,717,971	$19,567,000	—	31 Dec 2020	13F
Atom Investors LP	13F	Company	0.8%	1,309,331	$14,913,000	—	31 Dec 2020	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	0.8%	1,307,399	$14,892,000	—	31 Dec 2020	13F
FMR LLC	13F	Company	0.8%	1,300,888	$14,817,000	—	31 Dec 2020	13F
MORGAN STANLEY	13F	Company	0.78%	1,268,521	$14,449,000	—	31 Dec 2020	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.71%	1,154,446	$13,150,000	—	31 Dec 2020	13F
PEREGRINE CAPITAL MANAGEMENT LLC	13F	Company	0.63%	1,023,882	$11,662,000	—	31 Dec 2020	13F
Park West Asset Management LLC	13F	Company	0.59%	953,191	$10,857,000	—	31 Dec 2020	13F
Nuveen Asset Management, LLC	13F	Company	0.53%	869,737	$9,906,000	—	31 Dec 2020	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	0.53%	857,035	$9,762,000	—	31 Dec 2020	13F
Atle Fund Management AB	13F	Company	0.51%	835,000	$9,511,000	—	31 Dec 2020	13F
GLENMEDE TRUST CO NA	13F	Company	0.5%	811,463	$9,241,000	—	31 Dec 2020	13F
Bank of New York Mellon Corp	13F	Company	0.5%	811,376	$9,241,000	—	31 Dec 2020	13F
PICTET ASSET MANAGEMENT LTD	13F	Company	0.49%	791,716	$9,018,000	—	31 Dec 2020	13F
Islet Management, LP	13F	Company	0.43%	700,000	$7,973,000	—	31 Dec 2020	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.43%	692,955	$7,893,000	—	31 Dec 2020	13F
ACADIAN ASSET MANAGEMENT LLC	13F	Company	0.42%	684,891	$7,800,000	—	31 Dec 2020	13F
Skandinaviska Enskilda Banken AB (publ)	13F	Company	0.42%	682,900	$7,778,000	—	31 Dec 2020	13F
TWO SIGMA ADVISERS, LP	13F	Company	0.39%	632,857	$7,208,000	—	31 Dec 2020	13F
Point72 Asset Management, L.P.	13F	Company	0.38%	620,139	$7,063,000	—	31 Dec 2020	13F
TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY	13F	Company	0.37%	597,090	$6,801,000	—	31 Dec 2020	13F
Invesco Ltd.	13F	Company	0.36%	581,959	$6,629,000	—	31 Dec 2020	13F
JPMORGAN CHASE & CO	13F	Company	0.31%	504,681	$5,749,000	—	31 Dec 2020	13F
FEDERATED HERMES, INC.	13F	Company	0.31%	502,747	$5,727,000	—	31 Dec 2020	13F
Michael F. Price	13F	Individual	0.31%	501,874	$5,716,000	—	31 Dec 2020	13F
JUPITER ASSET MANAGEMENT LTD	13F	Company	0.26%	422,348	$4,806,000	—	31 Dec 2020	13F
WELLS FARGO & COMPANY/MN	13F	Company	0.25%	405,145	$4,615,000	—	31 Dec 2020	13F
BARCLAYS PLC	13F	Company	0.23%	377,228	$4,297,000	—	31 Dec 2020	13F
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	13F	Company	0.23%	374,569	$4,266,000	—	31 Dec 2020	13F
13D Management LLC	13F	Company	0.23%	370,435	$4,220,000	—	31 Dec 2020	13F

Institutional Holders of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) as of Q1 2021

As of 31 Mar 2021, IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) was held by 202 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 171,145,457 shares. The largest 10 holders included WELLINGTON MANAGEMENT GROUP LLP, BROWN CAPITAL MANAGEMENT LLC, Sarissa Capital Management LP, VANGUARD GROUP INC, BlackRock Inc., Camber Capital Management LP, STATE STREET CORP, WESTFIELD CAPITAL MANAGEMENT CO LP, CREDIT SUISSE AG/, and PUTNAM INVESTMENTS LLC. This page lists 202 institutional shareholders reporting positions in this security for the Q1 2021 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

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 Diff $	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.