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 | |
|---|---|---|---|---|---|---|
1176
PUT
Edison International
EIX
$30.8B
| $5.2M | ﹤0.01% |
89,800
| – | – |
|
|
AXON
1177
PUT
Axon Enterprise
AXON
$39.8B
| $5.2M | ﹤0.01% |
30,000
+100
| +0.3% | +$18.2K |
|
1178
PUT
Ventas
VTR
$48.3B
| $5.19M | ﹤0.01% |
99,600
+8,800
| +10% | +$504K |
|
1179
PUT
BJs Wholesale Club
BJ
$11.8B
| $5.19M | ﹤0.01% |
110,700
+100
| +0.1% | +$5.34K |
|
|
BIG
1180
PUT
DELISTED
Big Lots, Inc.
BIG
| $5.18M | ﹤0.01% |
79,100
+1,700
| +2% | +$92.6K |
|
1181
PUT
Gaotu Techedu
GOTU
$384M
| $5.18M | ﹤0.01% |
360,600
-6,600
| -2% | -$33.3K |
|
1182
PUT
Proshares UltraShort Technology
REW
$3.41M
| $5.18M | ﹤0.01% |
28,731
+4,062
| +16% | +$558K |
|
1183
CALL
Global Payments
GPN
$21.7B
| $5.17M | ﹤0.01% |
26,900
-100
| -0.4% | -$17.4K |
|
1184
PUT
Royal Bank of Canada
RY
$291B
| $5.17M | ﹤0.01% |
50,600
| – | – |
|
1185
NRG Energy
NRG
$30.1B
| $5.16M | ﹤0.01% |
127,329
-12,272
| -9% | -$522K |
|
1186
PUT
British American Tobacco
BTI
$131B
| $5.15M | ﹤0.01% |
130,600
+1,300
| +1% | +$48.8K |
|
1187
CALL
JetBlue
JBLU
$1.89B
| $5.15M | ﹤0.01% |
300,600
-38,200
| -11% | -$586K |
|
1188
PUT
Ciena
CIEN
$55.8B
| $5.14M | ﹤0.01% |
89,000
-400
| -0.4% | -$22.2K |
|
|
NEX
1189
PUT
DELISTED
NexTier Oilfield Solutions Inc.
NEX
| $5.14M | ﹤0.01% |
1,006,200
-100
| -0% | -$402 |
|
1190
CALL
Conagra Brands
CAG
$7B
| $5.13M | ﹤0.01% |
142,600
+100
| +0.1% | +$3.38K |
|
|
DENT
1191
PUT
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $5.13M | ﹤0.01% |
126,300
+400
| +0.3% | +$16.2K |
|
1192
CALL
Editas Medicine
EDIT
$411M
| $5.12M | ﹤0.01% |
90,600
+8,400
| +10% | +$460K |
|
1193
PUT
Advance Auto Parts
AAP
$3.23B
| $5.12M | ﹤0.01% |
24,500
| – | – |
|
1194
PUT
Idexx Laboratories
IDXX
$42.5B
| $5.11M | ﹤0.01% |
8,000
+1,000
| +14% | +$672K |
|
1195
CALL
Stratasys
SSYS
$695M
| $5.11M | ﹤0.01% |
203,300
+9,200
| +5% | +$199K |
|
|
CMRC
1196
PUT
Commerce.com Inc Series 1
CMRC
$217M
| $5.11M | ﹤0.01% |
78,700
-3,400
| -4% | -$207K |
|
1197
CALL
Invesco Mortgage Capital
IVR
$788M
| $5.09M | ﹤0.01% |
131,940
-890
| -0.7% | -$28.9K |
|
1198
Global X Lithium & Battery Tech ETF
LIT
$1.5B
| $5.09M | ﹤0.01% |
70,659
-47
| -0.1% | -$3.85K |
|
1199
PUT
KE Holdings
BEKE
$16.9B
| $5.06M | ﹤0.01% |
107,700
+9,200
| +9% | +$224K |
|
1200
PUT
iShares Convertible Bond ETF
ICVT
$7.28B
| $5.05M | ﹤0.01% |
146,600
| – | – |
|
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.