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 Q4 2023?

248 institutional investors reported IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock for Q4 2023. Use the holders table for investor-level position and value details.

IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD)

CUSIP: 46333X108

Q4 2023 13F Holders as of 31 Dec 2023

Security type / class: Equity / Class A Common Stock
Total 13F shares: 164,989,974
Total 13F value: $1,887,503,875
Share change: +1,595,575
Put/Call ratio: 56%
SEC-reported price per share: $11.44
Number of holders: 248
Value change: +$27,460,717
Number of buys: 107
Number of sells: 121
Shares outstanding: 163,103,594

Security key

46333X108

Report period

Q4 2023

Institutions

248

Top holders

IRWD full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2026 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: Q3 2026

Recent filing periods:

Q3 2026

Ownership snapshot

Top reported holders 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.

Comparable stake leader

BlackRock Finance, Inc.

Disclosed value leader

BlackRock Finance, Inc.

Comparable rows

0/15

Latest evidence

30 Sep 2023

13F Highest disclosed value: $243,006,457 15 rows are not safely comparable across share classes. Showing 1-6 of 15 holder rows.

Quick read

BlackRock Finance, Inc. has the largest disclosed position value at $243.01M.

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 BlackRock Finance, Inc.'s linked filing trail.

Disclosed position value Top 5

BlackRock Finance, Inc. $243.01M

Sarissa Capital Management LP $157.84M

VANGUARD GROUP INC $143.85M

STATE STREET CORP $115.58M

LSV ASSET MANAGEMENT $68.99M

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
BlackRock Finance, Inc.	13F Company 13F	— mixed-class rows	$243,006,457 25,234,624 shares mixed-class rows	—	30 Sep 2023
Sarissa Capital Management LP	13F Company 13F	— denominator unverified	$157,835,700 16,390,000 shares	—	30 Sep 2023
VANGUARD GROUP INC	13F Company 13F	— mixed-class rows	$143,846,069 15,177,727 shares mixed-class rows	—	30 Sep 2023
STATE STREET CORP	13F Company 13F	— mixed-class rows	$115,575,534 12,029,065 shares mixed-class rows	—	30 Sep 2023
LSV ASSET MANAGEMENT	13F Company 13F	— denominator unverified	$68,991,000 7,164,209 shares	—	30 Sep 2023
RENAISSANCE TECHNOLOGIES LLC	13F Company 13F	— denominator unverified	$55,853,000 5,799,898 shares	—	30 Sep 2023

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 Q4 2023

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

Institutions

248

164,989,974

Rows available

248

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 Q4 2023 vs Q3 2023 Across Filers

Q3 2023 holders

248

Q4 2023 holders

248

Holder diff

Investor	Q3 2023 Shares	Q4 2023 Shares	Share Diff	Share Chg %	Q3 2023 value	Q4 2023 value	Value change	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend