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 | |
|---|---|---|---|---|---|---|
1151
PUT
Agilent Technologies
A
$39.5B
| $5.29M | ﹤0.01% |
35,800
| – | – |
|
1152
PUT
Novartis
NVS
$297B
| $5.29M | ﹤0.01% |
57,700
| – | – |
|
1153
PUT
Agnico Eagle Mines
AEM
$72.3B
| $5.29M | ﹤0.01% |
87,400
+200
| +0.2% | +$11.6K |
|
1154
PUT
Southern Company
SO
$109B
| $5.29M | ﹤0.01% |
86,000
+200
| +0.2% | +$12.9K |
|
1155
CALL
C.H. Robinson
CHRW
$24.2B
| $5.29M | ﹤0.01% |
56,100
+600
| +1% | +$54.3K |
|
|
IPOF
1156
CALL
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $5.28M | ﹤0.01% |
516,800
+24,900
| +5% | +$250K |
|
1157
CALL
CF Industries
CF
$19.5B
| $5.28M | ﹤0.01% |
100,700
+1,200
| +1% | +$57.6K |
|
1158
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$259M
| $5.27M | ﹤0.01% |
53,500
| – | – |
|
1159
CALL
Builders FirstSource
BLDR
$7.59B
| $5.27M | ﹤0.01% |
120,600
-2,400
| -2% | -$117K |
|
|
TBHC
1160
PUT
DELISTED
The Brand House Collective
TBHC
| $5.26M | ﹤0.01% |
224,900
| – | – |
|
|
MRO
1161
PUT
DELISTED
Marathon Oil Corporation
MRO
| $5.26M | ﹤0.01% |
371,200
+4,500
| +1% | +$54.2K |
|
1162
CALL
Intuit
INTU
$77B
| $5.25M | ﹤0.01% |
10,700
+100
| +0.9% | +$53.9K |
|
1163
Zscaler
ZS
$22.6B
| $5.25M | ﹤0.01% |
24,546
+300
| +1% | +$75.3K |
|
1164
CALL
Cerence
CRNC
$398M
| $5.24M | ﹤0.01% |
48,300
| – | – |
|
1165
SLB Ltd
SLB
$70.6B
| $5.24M | ﹤0.01% |
158,371
+14,494
| +10% | +$415K |
|
1166
CALL
Coherent
COHR
$61.3B
| $5.23M | ﹤0.01% |
72,100
-1,000
| -1% | -$65.3K |
|
1167
PUT
Colgate-Palmolive
CL
$72.1B
| $5.23M | ﹤0.01% |
64,000
+100
| +0.2% | +$7.94K |
|
1168
The Mosaic Company
MOS
$7.08B
| $5.22M | ﹤0.01% |
164,343
+51,379
| +45% | +$1.64M |
|
1169
PUT
Intercontinental Exchange
ICE
$81B
| $5.22M | ﹤0.01% |
43,900
| – | – |
|
|
LAZR
1170
PUT
DELISTED
Luminar Technologies
LAZR
| $5.22M | ﹤0.01% |
16,260
+213
| +1% | +$56.4K |
|
1171
CALL
Appian
APPN
$1.61B
| $5.21M | ﹤0.01% |
38,300
+200
| +0.5% | +$22.2K |
|
1172
PUT
ChargePoint
CHPT
$140M
| $5.21M | ﹤0.01% |
7,895
+215
| +3% | +$100K |
|
1173
PUT
Chegg
CHGG
$109M
| $5.21M | ﹤0.01% |
62,500
| – | – |
|
|
GOOS
1174
PUT
Canada Goose Holdings
GOOS
$896M
| $5.2M | ﹤0.01% |
117,600
| – | – |
|
1175
PUT
Huazhu Hotels Group
HTHT
$12.5B
| $5.2M | ﹤0.01% |
96,900
| – | – |
|
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.