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 | |
|---|---|---|---|---|---|---|
926
CALL
Cedar Fair
FUN
$1.76B
| $7.22M | 0.01% |
159,400
-500
| -0.3% | -$22K |
|
927
CALL
GSK
GSK
$102B
| $7.19M | 0.01% |
143,200
+7,520
| +6% | +$378K |
|
928
PUT
Steel Dynamics
STLD
$34.7B
| $7.19M | 0.01% |
118,000
| – | – |
|
929
Radware
RDWR
$1.22B
| $7.17M | 0.01% |
231,359
+100
| +0% | +$3.31K |
|
930
PUT
United States Natural Gas Fund
UNG
$473M
| $7.17M | 0.01% |
140,225
+24,725
| +21% | +$1.49M |
|
931
PUT
American International
AIG
$41.4B
| $7.15M | 0.01% |
148,200
-1,200
| -0.8% | -$61.8K |
|
932
PUT
HSBC
HSBC
$349B
| $7.15M | 0.01% |
244,900
| – | – |
|
933
PUT
Ferrari
RACE
$63.2B
| $7.14M | 0.01% |
35,100
+100
| +0.3% | +$21.5K |
|
934
CALL
Stanley Black & Decker
SWK
$13.6B
| $7.14M | 0.01% |
34,600
+500
| +1% | +$97.5K |
|
935
CALL
Truist Financial
TFC
$62.5B
| $7.13M | 0.01% |
126,663
+1,161
| +0.9% | +$64.9K |
|
936
PUT
CF Industries
CF
$19.5B
| $7.12M | 0.01% |
135,900
-1,700
| -1% | -$81.6K |
|
|
B
937
Barrick Mining
B
$62.3B
| $7.12M | 0.01% |
345,983
-1,200
| -0.3% | -$24.1K |
|
938
CALL
Realty Income
O
$60.4B
| $7.12M | 0.01% |
109,598
-1,239
| -1% | -$83.6K |
|
939
ConocoPhillips
COP
$146B
| $7.12M | 0.01% |
113,164
-481
| -0.4% | -$27.8K |
|
940
CALL
Novartis
NVS
$297B
| $7.11M | 0.01% |
77,600
| – | – |
|
|
UCD
941
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $7.11M | 0.01% |
141,900
+2,200
| +2% | +$110K |
|
942
Blackstone
BX
$152B
| $7.1M | 0.01% |
73,127
+8,413
| +13% | +$976K |
|
|
DENT
943
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $7.04M | 0.01% |
180,100
-13,900
| -7% | -$543K |
|
944
PUT
Bunge Global
BG
$23.7B
| $7.04M | 0.01% |
88,600
+11,200
| +14% | +$865K |
|
945
CALL
NCR Voyix
VYX
$1.05B
| $7.03M | 0.01% |
247,434
+326
| +0.1% | +$8.48K |
|
946
CALL
Danaher
DHR
$135B
| $7.02M | 0.01% |
29,102
+338
| +1% | +$92K |
|
947
PUT
Invesco Aerospace & Defense ETF
PPA
$8.22B
| $7.02M | 0.01% |
75,200
| – | – |
|
|
JMIA
948
PUT
Jumia Technologies
JMIA
$734M
| $6.99M | 0.01% |
244,000
+1,900
| +0.8% | +$40.2K |
|
949
CALL
Dollar General
DG
$25.4B
| $6.97M | 0.01% |
32,000
-400
| -1% | -$90.3K |
|
950
Cisco
CSCO
$444B
| $6.92M | 0.01% |
129,467
+109,904
| +562% | +$6.17M |
|
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.