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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
751
CALL
C3.ai
AI
$1.26B
| $9.54M | 0.01% |
149,600
+300
| +0.2% | +$15.3K |
|
752
PUT
Petrobras
PBR
$123B
| $9.51M | 0.01% |
806,200
-16,600
| -2% | -$177K |
|
753
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $9.48M | 0.01% |
481,400
+15,100
| +3% | +$202K |
|
754
PUT
Bausch Health
BHC
$1.67B
| $9.44M | 0.01% |
314,000
| – | – |
|
755
PUT
HCA Healthcare
HCA
$83.7B
| $9.43M | 0.01% |
44,500
| – | – |
|
|
XLNX
756
PUT
DELISTED
Xilinx Inc
XLNX
| $9.4M | 0.01% |
66,300
+100
| +0.2% | +$14.7K |
|
|
FLNA
757
CALL
Filana Therapeutics
FLNA
$45.2M
| $9.39M | 0.01% |
105,800
-3,900
| -4% | -$325K |
|
758
PUT
AutoNation
AN
$6.84B
| $9.36M | 0.01% |
95,500
| – | – |
|
759
CALL
Proshares UltraShort Technology
REW
$3.39M
| $9.36M | 0.01% |
46,650
+1,669
| +4% | +$229K |
|
|
FSR
760
CALL
DELISTED
Fisker Inc.
FSR
| $9.35M | 0.01% |
507,500
-230,700
| -31% | -$3.47M |
|
761
PUT
ArcelorMittal
MT
$49.8B
| $9.34M | 0.01% |
299,200
-1,500
| -0.5% | -$49K |
|
762
Generac Holdings
GNRC
$12.4B
| $9.33M | 0.01% |
22,571
| – | – |
|
763
CALL
BioNTech
BNTX
$23.2B
| $9.3M | 0.01% |
41,500
+2,700
| +7% | +$858K |
|
764
PUT
ProShares UltraShort Health Care
RXD
$3.29M
| $9.29M | 0.01% |
259,500
+5,750
| +2% | +$155K |
|
765
CALL
Elevance Health
ELV
$82.2B
| $9.29M | 0.01% |
24,200
+4,700
| +24% | +$1.79M |
|
766
CALL
NetEase
NTES
$76.7B
| $9.27M | 0.01% |
81,500
+12,900
| +19% | +$1.22M |
|
767
Marriott International
MAR
$95.8B
| $9.26M | 0.01% |
66,538
+2,156
| +3% | +$301K |
|
768
PUT
Phillips 66
PSX
$83.5B
| $9.23M | 0.01% |
106,000
+3,500
| +3% | +$253K |
|
769
CALL
KE Holdings
BEKE
$17.8B
| $9.22M | 0.01% |
196,400
+75,500
| +62% | +$1.84M |
|
770
CALL
Teradyne
TER
$58.1B
| $9.16M | 0.01% |
70,800
+800
| +1% | +$97.2K |
|
771
PUT
Microchip Technology
MCHP
$44.2B
| $9.14M | 0.01% |
123,800
+200
| +0.2% | +$15K |
|
772
BP
BP
$113B
| $9.07M | 0.01% |
334,813
+8,098
| +2% | +$203K |
|
773
CALL
The Mosaic Company
MOS
$7.05B
| $9.06M | 0.01% |
285,000
+34,100
| +14% | +$1.09M |
|
774
CALL
TJX Companies
TJX
$169B
| $9.05M | 0.01% |
133,400
-1,000
| -0.7% | -$69.8K |
|
|
PPLC
775
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $9.04M | 0.01% |
112,200
+2,100
| +2% | +$169K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.