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 Q4 2018?

141 institutional investors reported IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value for Q4 2018. Use the holders table for investor-level position and value details.

CUSIP: 46333X108

Q4 2018 13F Holders as of 31 Dec 2018

Type / Class: Equity / Class A Common Stock, $0.001 par value
Shares outstanding: 162,843,862
Total 13F shares: 149,504,826
Share change: -285,830
Total reported value: $1,548,336,251
Put/Call ratio: 49%
Price per share: $10.36
Number of holders: 141
Value change: -$71,151,637
Number of buys: 73
Number of sells: 70

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: Q1 2019
Previous quarter: Q3 2018

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	12%	19,433,137	$358,735,000	—	30 Sep 2018	13F
FMR LLC	13F	Company	10%	16,914,985	$312,251,000	—	30 Sep 2018	13F
VANGUARD GROUP INC	13F	Company	7.6%	12,324,954	$227,518,000	—	30 Sep 2018	13F
BlackRock Finance, Inc.	13F	Company	7.5%	12,198,644	$225,188,000	—	30 Sep 2018	13F
PRICE T ROWE ASSOCIATES INC /MD/	13F	Company	5.5%	8,923,985	$164,737,000	—	30 Sep 2018	13F
JANUS HENDERSON GROUP PLC	13F	Company	4.9%	7,986,775	$147,436,000	—	30 Sep 2018	13F
BROWN CAPITAL MANAGEMENT LLC	13F	Company	4%	6,449,511	$119,058,000	—	30 Sep 2018	13F
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F	Company	3.8%	6,188,599	$114,241,538	—	30 Sep 2018	13F
STATE STREET CORP	13F	Company	3.3%	5,420,669	$100,067,000	—	30 Sep 2018	13F
EcoR1 Capital, LLC	13F	Company	3.2%	5,141,624	$94,914,000	—	30 Sep 2018	13F
Sarissa Capital Management LP	13F	Company	2.1%	3,367,100	$62,156,000	—	30 Sep 2018	13F
ORBIMED ADVISORS LLC	13F	Company	1.8%	2,929,250	$54,074,000	—	30 Sep 2018	13F
OppenheimerFunds, Inc.	13F	Company	1.8%	2,871,910	$53,015,000	—	30 Sep 2018	13F
ADAGE CAPITAL PARTNERS GP, L.L.C.	13F	Company	1.5%	2,375,000	$43,843,000	—	30 Sep 2018	13F
Capital World Investors	13F	Company	1.2%	2,030,000	$37,474,000	—	30 Sep 2018	13F
WESTFIELD CAPITAL MANAGEMENT CO LP	13F	Company	1.2%	1,878,809	$34,683,000	—	30 Sep 2018	13F
NORTHERN TRUST CORP	13F	Company	1%	1,679,122	$30,997,000	—	30 Sep 2018	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.96%	1,564,301	$28,876,000	—	30 Sep 2018	13F
LOOMIS SAYLES & CO L P	13F	Company	0.94%	1,522,716	$28,110,000	—	30 Sep 2018	13F
NEW YORK STATE COMMON RETIREMENT FUND	13F	Company	0.91%	1,488,180	$27,472,000	—	30 Sep 2018	13F
NORGES BANK	13F	Company	0.89%	1,441,994	$26,620,000	—	30 Sep 2018	13F
CREDIT SUISSE AG/	13F	Company	0.85%	1,378,664	$25,450,000	—	30 Sep 2018	13F
Park West Asset Management LLC	13F	Company	0.73%	1,194,945	$22,059,000	—	30 Sep 2018	13F
BNP Paribas Asset Management Holding S.A.	13F	Company	0.73%	1,182,623	$21,831,000	—	30 Sep 2018	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.7%	1,143,581	$21,111,000	—	30 Sep 2018	13F
PICTET ASSET MANAGEMENT LTD	13F	Company	0.63%	1,031,958	$19,050,000	—	30 Sep 2018	13F
Penn Capital Management Company, LLC	13F	Company	0.47%	764,028	$17,466,000	—	30 Sep 2018	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.48%	782,524	$14,446,000	—	30 Sep 2018	13F
UBS Group AG	13F	Company	0.44%	720,323	$13,297,000	—	30 Sep 2018	13F
Bank of New York Mellon Corp	13F	Company	0.38%	626,367	$11,564,000	—	30 Sep 2018	13F
BRIDGER MANAGEMENT, LLC	13F	Company	0.38%	621,891	$11,480,000	—	30 Sep 2018	13F
TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY	13F	Company	0.36%	591,989	$10,928,000	—	30 Sep 2018	13F
DEUTSCHE BANK AG\	13F	Company	0.31%	503,361	$9,291,000	—	30 Sep 2018	13F
Invesco Ltd.	13F	Company	0.29%	475,914	$8,785,000	—	30 Sep 2018	13F
CITADEL ADVISORS LLC	13F	Company	0.28%	453,533	$8,373,000	—	30 Sep 2018	13F
STATE OF WISCONSIN INVESTMENT BOARD	13F	Company	0.27%	435,030	$8,031,000	—	30 Sep 2018	13F
Granahan Investment Management, LLC	13F	Company	0.25%	405,224	$7,480,000	—	30 Sep 2018	13F
Fosun International Ltd	13F	Company	0.21%	347,701	$6,363,000	—	30 Sep 2018	13F
Brian C. Broderick	13F	Individual	0.2%	329,233	$6,078,000	—	30 Sep 2018	13F
CHICAGO EQUITY PARTNERS LLC	13F	Company	0.18%	291,165	$5,375,000	—	30 Sep 2018	13F
TIAA CREF INVESTMENT MANAGEMENT LLC	13F	Company	0.17%	278,552	$5,142,000	—	30 Sep 2018	13F
CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM	13F	Company	0.16%	265,629	$4,904,000	—	30 Sep 2018	13F
Swiss National Bank	13F	Company	0.16%	264,500	$4,883,000	—	30 Sep 2018	13F
TEACHERS ADVISORS, LLC	13F	Company	0.16%	262,571	$4,847,000	—	30 Sep 2018	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	0.16%	261,266	$4,823,000	—	30 Sep 2018	13F
MORGAN STANLEY	13F	Company	0.16%	257,608	$4,755,000	—	30 Sep 2018	13F
ALPS ADVISORS INC	13F	Company	0.15%	246,297	$4,547,000	—	30 Sep 2018	13F
UNITED SERVICES AUTOMOBILE ASSOCIATION	13F	Company	0.15%	245,689	$4,535,000	—	30 Sep 2018	13F
D. E. Shaw & Co., Inc.	13F	Company	0.15%	239,980	$4,430,000	—	30 Sep 2018	13F
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	13F	Company	0.13%	211,940	$3,912,000	—	30 Sep 2018	13F

Institutional Holders of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) as of Q4 2018

As of 31 Dec 2018, IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) was held by 141 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 149,504,826 shares. The largest 10 holders included WELLINGTON MANAGEMENT GROUP LLP, FMR LLC, Vanguard Group Inc, BlackRock Inc., BROWN CAPITAL MANAGEMENT LLC, UBS ASSET MANAGEMENT AMERICAS INC, JANUS HENDERSON GROUP PLC, Sarissa Capital Management LP, EcoR1 Capital, LLC, and STATE STREET CORP. This page lists 141 institutional shareholders reporting positions in this security for the Q4 2018 filing period.

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

Compare Q4 2018 vs Q3 2018 Across Filers

Q3 2018 holders

149

Q4 2018 holders

141

Holder diff

-8

Investor	Q3 2018 Shares	Q4 2018 Shares	Share Diff	Share Chg %	Q3 2018 Value $	Q4 2018 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.