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 | |
|---|---|---|---|---|---|---|
1201
PUT
Edwards Lifesciences
EW
$49.2B
| $5.05M | ﹤0.01% |
48,200
| – | – |
|
1202
Align Technology
ALGN
$12.1B
| $5.05M | ﹤0.01% |
8,159
+100
| +1% | +$67.9K |
|
|
ZNGA
1203
PUT
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
| $5.05M | ﹤0.01% |
468,900
+87,700
| +23% | +$797K |
|
|
FLNA
1204
Filana Therapeutics
FLNA
$44.1M
| $5.05M | ﹤0.01% |
56,882
+7,414
| +15% | +$619K |
|
|
NVTA
1205
PUT
DELISTED
Invitae Corporation
NVTA
| $5.04M | ﹤0.01% |
150,100
| – | – |
|
|
BBBY
1206
DELISTED
Bed Bath & Beyond Inc
BBBY
| $5.04M | ﹤0.01% |
154,438
+4,745
| +3% | +$128K |
|
1207
CALL
Universal Display
OLED
$3.71B
| $5.04M | ﹤0.01% |
23,000
+3,100
| +16% | +$642K |
|
1208
CALL
DigitalBridge
DBRG
$2.93B
| $5.01M | ﹤0.01% |
157,425
+50
| +0% | +$1.38K |
|
1209
PUT
Cardinal Health
CAH
$53.6B
| $5.01M | ﹤0.01% |
86,400
+800
| +0.9% | +$43.4K |
|
1210
CALL
Iron Mountain
IRM
$39.2B
| $5M | ﹤0.01% |
117,400
-100
| -0.1% | -$4.5K |
|
1211
CALL
Zebra Technologies
ZBRA
$12.5B
| $5M | ﹤0.01% |
9,400
-100
| -1% | -$55.7K |
|
1212
CALL
Blackstone Mortgage Trust
BXMT
$2.82B
| $4.99M | ﹤0.01% |
157,300
+400
| +0.3% | +$12.7K |
|
1213
Royal Caribbean
RCL
$79.8B
| $4.98M | ﹤0.01% |
57,959
+125
| +0.2% | +$10.1K |
|
1214
PUT
Deutsche Bank
DB
$66.7B
| $4.97M | ﹤0.01% |
378,300
+500
| +0.1% | +$6.27K |
|
1215
CALL
Deckers Outdoor
DECK
$13.1B
| $4.95M | ﹤0.01% |
76,200
+8,400
| +12% | +$576K |
|
1216
PUT
Renaissance IPO ETF
IPO
$157M
| $4.95M | ﹤0.01% |
76,000
+200
| +0.3% | +$13K |
|
1217
PUT
Pool Corp
POOL
$6.65B
| $4.94M | ﹤0.01% |
10,700
| – | – |
|
|
IAA
1218
PUT
DELISTED
IAA, Inc. Common Stock
IAA
| $4.94M | ﹤0.01% |
87,000
| – | – |
|
1219
International Paper
IP
$20.4B
| $4.93M | ﹤0.01% |
84,691
-1,418
| -2% | -$78.9K |
|
1220
ExxonMobil
XOM
$649B
| $4.93M | ﹤0.01% |
77,898
+54,412
| +232% | +$3.1M |
|
1221
PUT
BHP
BHP
$213B
| $4.92M | ﹤0.01% |
76,116
+7,062
| +10% | +$431K |
|
1222
CALL
Bumble
BMBL
$377M
| $4.91M | ﹤0.01% |
86,200
+300
| +0.3% | +$15.6K |
|
|
SIVB
1223
CALL
DELISTED
SVB Financial Group
SIVB
| $4.91M | ﹤0.01% |
8,700
| – | – |
|
|
OLO
1224
DELISTED
Olo Inc
OLO
| $4.91M | ﹤0.01% |
+143,230
| New | +$5.11M |
|
1225
CALL
W.P. Carey
WPC
$17B
| $4.91M | ﹤0.01% |
67,080
+102
| +0.2% | +$7.76K |
|
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.