Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6926
PUT
Wave Life Sciences
WVE
$1.13B
| $17K | ﹤0.01% |
2,700
-38,800
| -93% | -$256K |
|
6927
Ziff Davis
ZD
$1.95B
| $17K | ﹤0.01% |
590
+381
| +182% | +$12.2K |
|
6928
PUT
Zymeworks
ZYME
$1.66B
| $17K | ﹤0.01% |
1,400
+300
| +27% | +$3.57K |
|
|
TECX
6929
PUT
Tectonic Therapeutic
TECX
$562M
| $17K | ﹤0.01% |
+900
| New | +$18.2K |
|
|
ASMG
6930
Leverage Shares 2X Long ASML Daily ETF
ASMG
$33.7M
| $17K | ﹤0.01% |
+1,114
| New | +$14.6K |
|
|
SNOU
6931
T-REX 2X Long SNOW Daily Target ETF
SNOU
$27M
| $17K | ﹤0.01% |
+324
| New | +$13.7K |
|
|
VFLQ
6932
CALL
DELISTED
Vanguard U.S. Liquidity Factor ETF
VFLQ
| $17K | ﹤0.01% |
100
-300
| -75% | -$51K |
|
|
AGEN
6933
PUT
Agenus
AGEN
$275M
| $16K | ﹤0.01% |
3,600
+600
| +20% | +$2.08K |
|
|
AHRT
6934
CALL
AH Realty Trust
AHRT
$540M
| $16K | ﹤0.01% |
2,400
-7,100
| -75% | -$49.3K |
|
6935
Annexon
ANNX
$814M
| $16K | ﹤0.01% |
+6,673
| New | +$13.4K |
|
|
ANSS
6936
CALL
DELISTED
Ansys
ANSS
| $16K | ﹤0.01% |
2,400
+200
| +9% | +$65.5K |
|
6937
Aware
AWRE
$24.2M
| $16K | ﹤0.01% |
8,747
+5,686
| +186% | +$9.41K |
|
|
BDN
6938
CALL
Brandywine Realty Trust
BDN
$521M
| $16K | ﹤0.01% |
3,800
-18,400
| -83% | -$76.4K |
|
|
BGFV
6939
CALL
DELISTED
Big 5 Sporting Goods
BGFV
| $16K | ﹤0.01% |
11,600
-102,100
| -90% | -$109K |
|
6940
BlueLinx
BXC
$465M
| $16K | ﹤0.01% |
+218
| New | +$15.2K |
|
6941
PUT
Ceco Environmental
CECO
$3.94B
| $16K | ﹤0.01% |
600
+500
| +500% | +$12.5K |
|
6942
Carlyle Secured Lending
CGBD
$719M
| $16K | ﹤0.01% |
1,199
+778
| +185% | +$11.1K |
|
|
CHMI
6943
CALL
Cherry Hill Mortgage Investment Corp
CHMI
$81.9M
| $16K | ﹤0.01% |
+6,100
| New | +$17.8K |
|
6944
Direxion Auspice Broad Commodity Strategy ETF
COM
$205M
| $16K | ﹤0.01% |
+586
| New | +$16.6K |
|
6945
CALL
Cricut
CRCT
$987M
| $16K | ﹤0.01% |
2,500
+1,100
| +79% | +$6.28K |
|
6946
PUT
Corsair Gaming
CRSR
$1.15B
| $16K | ﹤0.01% |
1,700
-7,600
| -82% | -$61.3K |
|
6947
Data I/O
DAIO
$31.5M
| $16K | ﹤0.01% |
5,181
+2,987
| +136% | +$7.53K |
|
6948
Daktronics
DAKT
$953M
| $16K | ﹤0.01% |
1,113
-200
| -15% | -$2.75K |
|
6949
ProShares UltraShort Euro
EUO
$35.5M
| $16K | ﹤0.01% |
618
-2,622
| -81% | -$77.4K |
|
6950
CALL
FTI Consulting
FCN
$5.04B
| $16K | ﹤0.01% |
100
-600
| -86% | -$98K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.