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 | |
|---|---|---|---|---|---|---|
726
CALL
iQIYI
IQ
$1.18B
| $9.94M | 0.01% |
656,800
+11,900
| +2% | +$123K |
|
727
PUT
Nutanix
NTNX
$14.3B
| $9.94M | 0.01% |
259,600
-100
| -0% | -$3.78K |
|
728
CALL
Under Armour Class C
UA
$2.78B
| $9.92M | 0.01% |
482,500
-200
| -0% | -$3.83K |
|
729
PUT
Dollar Tree
DLTR
$22.8B
| $9.92M | 0.01% |
99,300
-500
| -0.5% | -$48.1K |
|
730
PUT
Stem
STEM
$52.8M
| $9.92M | 0.01% |
13,400
+250
| +2% | +$132K |
|
731
CALL
American Tower
AMT
$77.7B
| $9.81M | 0.01% |
36,300
+600
| +2% | +$171K |
|
732
CALL
EOG Resources
EOG
$77.9B
| $9.8M | 0.01% |
114,000
+4,100
| +4% | +$299K |
|
733
CALL
Vanguard FTSE Europe ETF
VGK
$29.8B
| $9.8M | 0.01% |
165,400
| – | – |
|
734
iShares Silver Trust
SLV
$27.9B
| $9.79M | 0.01% |
406,274
-59,336
| -13% | -$1.33M |
|
735
PUT
Centene
CNC
$31.5B
| $9.77M | 0.01% |
132,700
-200
| -0.2% | -$13.4K |
|
736
CALL
Avis
CAR
$5.72B
| $9.75M | 0.01% |
119,100
-1,700
| -1% | -$150K |
|
737
CALL
MongoDB
MDB
$24.1B
| $9.73M | 0.01% |
27,200
+7,000
| +35% | +$2.82M |
|
738
CALL
ProShares Ultra S&P500
SSO
$7.82B
| $9.73M | 0.01% |
477,200
+2,800
| +0.6% | +$88.5K |
|
739
CALL
Cracker Barrel
CBRL
$1.15B
| $9.72M | 0.01% |
65,100
+900
| +1% | +$126K |
|
740
CALL
CME Group
CME
$91.3B
| $9.7M | 0.01% |
45,300
+200
| +0.4% | +$40.5K |
|
741
CALL
Labcorp
LH
$23.6B
| $9.7M | 0.01% |
40,624
| – | – |
|
|
DISCK
742
CALL
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $9.68M | 0.01% |
311,600
-19,100
| -6% | -$510K |
|
743
CALL
MetLife
MET
$59.5B
| $9.67M | 0.01% |
159,800
-2,600
| -2% | -$157K |
|
744
PUT
Polaris
PII
$4.12B
| $9.66M | 0.01% |
71,900
+1,000
| +1% | +$127K |
|
745
State Street Utilities Select Sector SPDR ETF
XLU
$23.9B
| $9.61M | 0.01% |
300,820
-12,082
| -4% | -$404K |
|
746
PUT
XPO
XPO
$25.2B
| $9.59M | 0.01% |
114,107
-69,786
| -38% | -$3.5M |
|
747
CALL
Franco-Nevada
FNV
$41.3B
| $9.56M | 0.01% |
65,800
| – | – |
|
748
CALL
Atlassian
TEAM
$20.9B
| $9.56M | 0.01% |
37,000
-300
| -0.8% | -$100K |
|
749
PUT
Vail Resorts
MTN
$5.14B
| $9.56M | 0.01% |
29,600
+6,600
| +29% | +$2.04M |
|
750
CALL
General Dynamics
GD
$103B
| $9.55M | 0.01% |
50,800
+100
| +0.2% | +$19.6K |
|
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.