We are live on !
Find out more
SL
Siren LLC Portfolio holdings
AUM
$4.94B
Turnover
27.78%
1-Year Est. Return
244.43%
This Fund
S&P 500
This Quarter Est. Return
+34.74%
1 Year Est. Return
+244.43%
3 Year Est. Return
–
5 Year Est. Return
–
10 Year Est. Return
–
AUM
$4.94B
AUM Growth
+$1.33B
(+37%)
Cap. Flow
+$314M
Cap. Flow % of AUM
Cap. Flow %
6.35%
Top 10 Holdings %
Top 10 Hldgs %
44.63%
Holding
126
New
26
Increased
32
Reduced
21
Closed
9
Avg Time Held
Equity + Options
0.9
years
Top 10 Avg Time Held
Equity + Options
0.9
years
Top 20 Avg Time Held
Equity + Options
0.7
years
Avg Time Held Equity only
0.9
years
Top 10 Avg Time Held Equity only
0.9
years
Top 20 Avg Time Held Equity only
0.7
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
PBLS
Parabilis Medicines Inc
PBLS
|
+$82.7M |
| 2 |
Abivax
ABVX
|
+$65.2M |
| 3 |
Hemab Therapeutics
COAG
|
+$57.6M |
| 4 |
Relay Therapeutics
RLAY
|
+$53M |
| 5 |
Kailera Therapeutics
KLRA
|
+$48.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Scholar Rock
SRRK
|
+$60.4M |
| 2 |
Edgewise Therapeutics
EWTX
|
+$42.9M |
| 3 |
CNTA
Centessa Pharmaceuticals
CNTA
|
+$41.8M |
| 4 |
Revolution Medicines
RVMD
|
+$30.8M |
| 5 |
Kymera Therapeutics
KYMR
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 92.94% |
| 2 | Technology | 3.57% |
| 3 | Communication Services | 1.85% |
| 4 | Financials | 0.87% |
| 5 | Consumer Discretionary | 0.43% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
126
Forgent Power Solutions
FPS
$5.35B
| – | – |
-100,000
| Closed | -$2.93M | – |
|
Similar funds
Siren LLC's Q2 2026 Portfolio in Review
As of Q2 2026, Siren LLC held 126 positions worth $4.94B, up 37% from $3.61B the previous quarter. Its ten largest holdings account for 45% of the portfolio.
Siren LLC deployed $314M of net new capital in Q2 2026, opening 26 new positions and adding to 32 existing holdings. Its largest new stake was Parabilis Medicines Inc: 2,992,259 shares worth $81.9M.
By sector, the portfolio is most concentrated in Healthcare at 93% of assets, down from 94% a quarter earlier, followed by Technology and Communication Services.
On the sell side, the largest reduction was Scholar Rock, an estimated $60.4M trimmed.
- Siren LLC's largest Q2 2026 buy was Parabilis Medicines Inc: 2,992,259 shares worth $81.9M.
- Siren LLC added most to Enliven Therapeutics in Q2 2026, an estimated $43.7M increase.
- Siren LLC's biggest Q2 2026 reduction was Scholar Rock, cutting an estimated $60.4M.
- Siren LLC fully exited Centessa Pharmaceuticals in Q2 2026, selling an estimated $41.8M.
- Siren LLC's ten largest holdings make up 45% of its $4.94B portfolio in Q2 2026.
- Siren LLC opened 26 new positions and closed 9 in Q2 2026.
- Siren LLC's portfolio value rose 37% quarter-over-quarter to $4.94B.
Based on Siren LLC's 13F filing for Q2 2026, filed 13 Aug 2026.