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IRWD · Ironwood Pharmaceuticals Inc

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$4.41 +0.14 (+3.28%) At close · Sep 2
Market Cap
$705.57M
Shares
165.24M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 212
Total Value: $679,179,240
Total Shares: 161,325,585
Showing 1–100 of 219 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 212 13F filers · Δ vs Mar 31, 2026
Top Holder
11.0%
Sep 2023 → Jun 2026 · range 8.7% – 15.5%
+2.4 pts
Top 5
36.2%
Sep 2023 → Jun 2026 · range 33.7% – 49.5%
+2.5 pts
Top 10
56.3%
Sep 2023 → Jun 2026 · range 54.6% – 69.3%
+1.7 pts
HHI
430
Sep 2023 → Jun 2026 · range 395 – 631
Broadly held+36

Quarterly Activity

vs Mar 31, 2026
New
24
Increased
73
Decreased
84
Sold Out
39
Unchanged
31
Holder count: -15
Institutional value: +11.6%
Shares held: -7.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 219
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1446847 CUSIP 46333X108 13F (30d) 173 filings 170 filers Visit website Investor relations