Security key
81734D104
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 86,718
- Total 13F value
- $3,393,129
- Share change
- +46,211
- SEC-reported price per share
- $39.13
- Number of holders
- 19
- Value change
- +$1,808,240
- Number of buys
- 12
- Number of sells
- 1
- Shares outstanding
- 45,097,233
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2026
Institutions
19
Top holders
10
SEPN full security history
Ownership snapshot
Full 13F holder table
Septerna, Inc. SEC filings
Septerna, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 81734D104
Recent filing periods:
Ownership snapshot
Top reported holders of SEPN - Septerna, Inc. - 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
Third Rock Ventures V, L.P.
Disclosed value leader
Third Rock Ventures VI, L.P.
Comparable rows
4/15
Latest evidence
12 Aug 2026
3/4/5
13D/G
13F
Lead comparable stake: 14%
11 rows are not safely comparable across share classes.
13D/G row: Third Rock Ventures V, L.P.
Showing 1-6 of 15 holder rows.
Quick read
Third Rock Ventures V, L.P. leads the comparable SEC ownership view at 14%.
4 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 Third Rock Ventures V, L.P.'s linked filing trail.
Comparable ownership
Top 4
Third Rock Ventures V, L.P.
14%
RA CAPITAL MANAGEMENT, L.P.
12%
DRIEHAUS CAPITAL MANAGEMENT LLC
9.8%
BIOTECHNOLOGY VALUE FUND L P
3.8%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Third Rock Ventures V, L.P. |
3/4/5
13D/G
10%+ Owner
|
14%
Reported 13D/G
· 31 Mar 2025
|
$469,463,739
13,432,506 shares
mixed-class rows
|
+$7,399,858 | 12 Aug 2026 |
| RA CAPITAL MANAGEMENT, L.P. |
13F
13D/G
3/4/5
Company · Director, 10%+ Owner
|
12%
Reported 13D/G
· 12 Aug 2026
|
$234,291,284
6,995,858 shares
|
— | 30 Jun 2026 |
| DRIEHAUS CAPITAL MANAGEMENT LLC |
13D/G
13F
Company
|
9.8%
Reported 13D/G
· 30 Jun 2026
|
$148,463,112
4,433,058 shares
|
-$7,597,307 | 30 Jun 2026 |
| BIOTECHNOLOGY VALUE FUND L P |
13D/G
BVF PARTNERS L P/IL
|
3.8%
Reported 13D/G
· 31 Dec 2025
|
$42,813,056
1,720,782 shares
|
-$66,562,509 | 31 Dec 2025 |
| Third Rock Ventures VI, L.P. |
3/4/5
10%+ Owner
|
—
mixed-class rows
|
$488,309,201
16,495,641 shares
mixed-class rows
|
+$7,399,858 | 12 Aug 2026 |
| Third Rock Ventures GP V, LP |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$451,021,871
10,280,050 shares
|
+$7,399,858 | 12 Aug 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 Q3 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
19
Shares
86,718
Rows available
19
| 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 Q3 2026 vs Q2 2026 Across Filers
Q2 2026 holders
153
Q3 2026 holders
19
Holder diff
-134
| Investor | Q2 2026 Shares | Q3 2026 Shares | Share Diff | Share Chg % | Q2 2026 value | Q3 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend