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 2016?

133 institutional investors reported IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value for Q1 2016. Use the holders table for investor-level position and value details.

CUSIP: 46333X108

Q1 2016 13F Holders as of 31 Mar 2016

Type / Class: Equity / Class A Common Stock, $0.001 par value
Shares outstanding: 162,843,862
Total 13F shares: 141,086,992
Share change: +1,079,716
Total reported value: $1,542,611,000
Put/Call ratio: 67%
Price per share: $10.94
Number of holders: 133
Value change: +$6,575,341
Number of buys: 68
Number of sells: 59

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 2016
Previous quarter: Q4 2015

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
FMR LLC	13F	Company	12%	19,372,317	$224,525,000	—	31 Dec 2015	13F
WELLINGTON MANAGEMENT GROUP LLP	13F	Company	11%	17,778,210	$206,050,000	—	31 Dec 2015	13F
JANUS HENDERSON INVESTORS US LLC	13F	Company	9.7%	15,761,668	$182,672,000	—	31 Dec 2015	13F
ORBIMED ADVISORS LLC	13F	Company	6.9%	11,226,400	$130,114,000	—	31 Dec 2015	13F
VANGUARD GROUP INC	13F	Company	5.4%	8,810,823	$102,117,000	—	31 Dec 2015	13F
Rubric Capital Management, LLC	13F	Company	3.9%	6,422,200	$74,433,000	—	31 Dec 2015	13F
BlackRock Fund Advisors	13F	Company	3.4%	5,575,596	$64,621,000	—	31 Dec 2015	13F
PRICE T ROWE ASSOCIATES INC /MD/	13F	Company	3.1%	5,118,010	$59,318,000	—	31 Dec 2015	13F
BRIDGER MANAGEMENT, LLC	13F	Company	3%	4,944,594	$57,308,000	—	31 Dec 2015	13F
Redmile Group, LLC	13F	Company	2.3%	3,671,344	$42,551,000	—	31 Dec 2015	13F
STATE STREET CORP	13F	Company	2.1%	3,392,238	$39,316,000	—	31 Dec 2015	13F
BlackRock Institutional Trust Company, N.A.	13F	Company	2%	3,219,962	$37,319,000	—	31 Dec 2015	13F
STATE OF WISCONSIN INVESTMENT BOARD	13F	Company	1.9%	3,041,686	$35,253,000	—	31 Dec 2015	13F
BVF INC/IL	13F	Company	1.8%	2,935,975	$34,028,000	—	31 Dec 2015	13F
EverPoint Asset Management, LLC	13F	Company	1.4%	2,350,000	$27,237,000	—	31 Dec 2015	13F
Gamma As Sector	13F	Individual	1.2%	1,974,421	$22,884,000	—	31 Dec 2015	13F
NORTHERN TRUST CORP	13F	Company	1%	1,709,052	$19,808,000	—	31 Dec 2015	13F
DEUTSCHE BANK AG\	13F	Company	1%	1,668,824	$19,340,000	—	31 Dec 2015	13F
Point72 Asset Management, L.P.	13F	Company	0.94%	1,537,900	$17,824,000	—	31 Dec 2015	13F
LOOMIS SAYLES & CO L P	13F	Company	0.93%	1,519,512	$17,611,000	—	31 Dec 2015	13F
CREDIT SUISSE AG/	13F	Company	0.9%	1,461,380	$16,937,000	—	31 Dec 2015	13F
MORGAN STANLEY	13F	Company	0.59%	963,822	$11,170,000	—	31 Dec 2015	13F
NORGES BANK	13F	Company	0.54%	885,738	$10,266,000	—	31 Dec 2015	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.54%	874,584	$10,136,000	—	31 Dec 2015	13F
Asset Management One Co., Ltd.	13F	Company	0.51%	825,823	$9,959,000	—	31 Dec 2015	13F
EcoR1 Capital, LLC	13F	Company	0.5%	821,531	$9,522,000	—	31 Dec 2015	13F
JPMORGAN CHASE & CO	13F	Company	0.46%	754,529	$8,745,000	—	31 Dec 2015	13F
Lombard Odier Asset Management (USA) Corp	13F	Company	0.37%	602,271	$6,980,000	—	31 Dec 2015	13F
Bank of New York Mellon Corp	13F	Company	0.37%	597,171	$6,921,000	—	31 Dec 2015	13F
AXA S.A.	13F	Company	0.26%	431,420	$5,000,000	—	31 Dec 2015	13F
BlackRock Investment Management, LLC	13F	Company	0.26%	422,802	$4,900,000	—	31 Dec 2015	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.25%	409,780	$4,750,000	—	31 Dec 2015	13F
TIAA CREF INVESTMENT MANAGEMENT LLC	13F	Company	0.25%	407,149	$4,719,000	—	31 Dec 2015	13F
THRIVENT FINANCIAL FOR LUTHERANS	13F	Company	0.25%	401,986	$4,659,000	—	31 Dec 2015	13F
GUGGENHEIM CAPITAL LLC	13F	Company	0.23%	369,971	$4,288,000	—	31 Dec 2015	13F
OXFORD ASSET MANAGEMENT LLP	13F	Company	0.22%	357,495	$4,235,000	—	31 Dec 2015	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	0.18%	292,512	$3,390,000	—	31 Dec 2015	13F
D. E. Shaw & Co., Inc.	13F	Company	0.18%	290,331	$3,365,000	—	31 Dec 2015	13F
CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM	13F	Company	0.16%	263,300	$3,052,000	—	31 Dec 2015	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	0.15%	242,553	$2,811,000	—	31 Dec 2015	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.15%	236,926	$2,746,000	—	31 Dec 2015	13F
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	13F	Company	0.14%	233,338	$2,704,000	—	31 Dec 2015	13F
Artal Group S.A.	13F	Company	0.13%	216,879	$2,514,000	—	31 Dec 2015	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	0.13%	208,160	$2,413,000	—	31 Dec 2015	13F
TEACHERS ADVISORS, LLC	13F	Company	0.12%	197,975	$2,295,000	—	31 Dec 2015	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.12%	191,461	$2,219,000	—	31 Dec 2015	13F
PICTET ASSET MANAGEMENT LTD	13F	Company	0.11%	184,200	$2,135,000	—	31 Dec 2015	13F
TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY	13F	Company	0.11%	183,578	$2,127,000	—	31 Dec 2015	13F
BAKER BROS. ADVISORS LP	13F	Company	0.1%	169,163	$1,961,000	—	31 Dec 2015	13F
ALPS ADVISORS INC	13F	Company	0.1%	167,286	$1,939,000	—	31 Dec 2015	13F

Institutional Holders of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) as of Q1 2016

As of 31 Mar 2016, IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) was held by 133 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 141,086,992 shares. The largest 10 holders included FMR LLC, WELLINGTON MANAGEMENT GROUP LLP, JANUS CAPITAL MANAGEMENT LLC, ORBIMED ADVISORS LLC, VANGUARD GROUP INC, PRICE T ROWE ASSOCIATES INC /MD/, BlackRock Fund Advisors, BRIDGER MANAGEMENT, LLC, Consonance Capital Management LP, and Redmile Group, LLC. This page lists 133 institutional shareholders reporting positions in this security for the Q1 2016 filing period.

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

Compare Q1 2016 vs Q4 2015 Across Filers

Q4 2015 holders

133

Q1 2016 holders

133

Holder diff

Investor	Q4 2015 Shares	Q1 2016 Shares	Share Diff	Share Chg %	Q4 2015 Value $	Q1 2016 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.