I-Mab
I-Mab (IMAB) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IMAB · as of Sep 30, 2025
Ownership Breakdown
45
Institutional Holders
▲ 12 vs Q2
$112.31M
Total Inst. Value
▲ $89.57M vs Q2
81.83M
Shares Outstanding
freeFloat 99.73%
29.69M
13F Shares Held
▲ 20.29M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IMAB largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
JANUS HENDERSON GROUP PLC pharmaceutical preparations | 7.99M | 9.78% | 9.78% | $30.29B | Nov 14, 2025 | NEW |
HHLR ADVISORS, LTD. pharmaceutical preparations | 5.98M | 7.32% | 7.32% | $22.61B | Nov 14, 2025 | — held |
ADAGE CAPITAL PARTNERS GP, L.L.C. pharmaceutical preparations | 3.34M | 4.09% | 4.09% | $12.62B | Nov 14, 2025 | NEW |
MORGAN STANLEY pharmaceutical preparations | 2.23M | 2.73% | 2.73% | $8.44B | May 27, 2026 | ▲ 2.17M |
ARIOSE CAPITAL MANAGEMENT LTD pharmaceutical preparations | 1.70M | 2.09% | 2.09% | $6.44B | Oct 21, 2025 | ▲ 1.61M |
EXOME ASSET MANAGEMENT LLC pharmaceutical preparations | 1.44M | 1.76% | 1.76% | $5.44B | Nov 14, 2025 | NEW |
SIREN, L.L.C. pharmaceutical preparations | 1.17M | 1.43% | 1.43% | $4.41B | Nov 13, 2025 | NEW |
CANDRIAM S.C.A. pharmaceutical preparations | 1.13M | 1.39% | 1.39% | $4.28B | Nov 6, 2025 | — held |
WOODLINE PARTNERS LP pharmaceutical preparations | 1.05M | 1.29% | 1.29% | $3.97B | Nov 14, 2025 | NEW |
POINT72 HONG KONG LTD pharmaceutical preparations | 561.4K | 68.71% | 68.71% | $2.12B | Nov 14, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
14
Increased
+4.90M shares20
New Positions
first time holders6
Decreased
−508.8K shares5
Sold Out
fully exitedNet shares change (top 50)
+4.39M
+4.90M / −508.8K
Net new holders
+23
20 new / 5 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IMAB insider trading · insider activity
Source: SEC Form 4
Recent Insider Transactions
Showing 10 most recent · Common Stock only
No recent insider transactions reported.
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
I-Mab (IMAB) is primarily owned by institutional investors, who hold approximately 36.3% of total shares outstanding. Company insiders own approximately 0.27%, while retail and public investors account for the remaining 63.44%.
The largest institutional shareholder of I-Mab is JANUS HENDERSON GROUP PLC, holding approximately 7.99 million shares — equal to 9.78% of outstanding shares — as of September 30, 2025.
A total of 45 institutional investors currently hold IMAB stock, with a combined institutional value of approximately $112,309,052 as of the most recent 13F filing period.
Frequently asked questions
IMAB ownershipI-Mab (IMAB) is primarily owned by institutional investors, who hold approximately 36.3% of shares. The largest shareholder is JANUS HENDERSON GROUP PLC with a 9.78% stake. Company insiders hold 0.27%. Data sourced from SEC Form 13F as of September 30, 2025.