Security key
86627T108
- Security type / class
- Equity / COM
- Total 13F shares
- 784,626
- Total 13F value
- $11,432,539
- Share change
- -142,430
- SEC-reported price per share
- $14.57
- Number of holders
- 30
- Value change
- -$2,753,790
- Number of buys
- 13
- Number of sells
- 18
Report period
Q2 2026
Institutions
30
Top holders
10
SMMT full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q1 2026
Summit Therapeutics Inc. SEC filings
Summit Therapeutics Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 86627T108
Recent filing periods:
Ownership snapshot
Top reported holders of SMMT - Summit Therapeutics Inc. - COM (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
Robert W. Duggan
Disclosed value leader
Robert W. Duggan
Comparable rows
0/15
Latest evidence
12 Jun 2026
3/4/5
13F
Highest disclosed value: $8,324,567,933
15 rows are not safely comparable across share classes.
Showing 1-6 of 15 holder rows.
Quick read
Robert W. Duggan has the largest disclosed position value at $8.32B.
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 Robert W. Duggan's linked filing trail.
Disclosed position value
Top 5
Robert W. Duggan
$8.32B
Mahkam Zanganeh
$8.21B
BAKER BROS. ADVISORS LP
$689.97M
Yu Xia
$600.8M
FMR LLC
$205.78M
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 |
|---|---|---|---|---|---|
| Robert W. Duggan |
3/4/5
Co-Chief Executive Officer, Director, 10%+ Owner
|
—
mixed-class rows
|
$8,324,567,933
622,015,239 shares
mixed-class rows
|
+$57,931,939 | 12 Jun 2026 |
| Mahkam Zanganeh |
3/4/5
Co-Chief Executive Officer, Director, 10%+ Owner
|
—
mixed-class rows
|
$8,214,516,275
619,617,599 shares
mixed-class rows
|
+$57,931,939 | 12 Jun 2026 |
| BAKER BROS. ADVISORS LP |
13F
Company
|
—
class O/S missing
|
$689,974,554
36,391,063 shares
|
— | 31 Mar 2026 |
| Yu Xia |
3/4/5
Director
|
—
mixed-class rows
|
$600,800,855
32,092,147 shares
mixed-class rows
|
+$9,999,983 | 02 Jan 2026 |
| FMR LLC |
13F
Company
|
—
class O/S missing
|
$205,776,661
10,853,199 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$183,035,250
9,653,758 shares
|
— | 31 Mar 2026 |
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 Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
30
Shares
784,626
Rows available
30
| 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 Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
221
Q2 2026 holders
30
Holder diff
-191
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend