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 | |
|---|---|---|---|---|---|---|
1401
CALL
FuelCell Energy
FCEL
$1.7B
| $4M | ﹤0.01% |
15,527
-160
| -1% | -$31.8K |
|
|
ALTU
1402
CALL
DELISTED
Altitude Acquisition Corp
ALTU
| $4M | ﹤0.01% |
408,900
| – | – |
|
1403
CALL
Arrowhead Research
ARWR
$12.1B
| $4M | ﹤0.01% |
47,100
| – | – |
|
1404
CALL
Factset
FDS
$9.05B
| $4M | ﹤0.01% |
11,900
| – | – |
|
1405
PUT
Host Hotels & Resorts
HST
$16.8B
| $4M | ﹤0.01% |
230,700
+1,900
| +0.8% | +$30.8K |
|
1406
CALL
Invesco Aerospace & Defense ETF
PPA
$8.27B
| $3.99M | ﹤0.01% |
40,400
-100
| -0.2% | -$7.35K |
|
1407
CALL
Louisiana-Pacific
LPX
$5.2B
| $3.99M | ﹤0.01% |
66,000
-100
| -0.2% | -$5.89K |
|
1408
PUT
Transocean
RIG
$5.92B
| $3.99M | ﹤0.01% |
806,700
+125,000
| +18% | +$455K |
|
1409
CALL
Polaris
PII
$4.15B
| $3.99M | ﹤0.01% |
29,700
+100
| +0.3% | +$12.7K |
|
1410
PUT
Coupang
CPNG
$27.8B
| $3.98M | ﹤0.01% |
95,900
+100
| +0.1% | +$3.46K |
|
1411
CALL
EPAM Systems
EPAM
$4.69B
| $3.98M | ﹤0.01% |
7,800
| – | – |
|
1412
CALL
Winnebago Industries
WGO
$870M
| $3.98M | ﹤0.01% |
56,500
-100
| -0.2% | -$6.99K |
|
1413
PUT
Cheniere Energy
LNG
$56.5B
| $3.98M | ﹤0.01% |
45,700
+100
| +0.2% | +$8.75K |
|
1414
State Street Energy Select Sector SPDR ETF
XLE
$39.5B
| $3.97M | ﹤0.01% |
144,910
+127,760
| +745% | +$3.17M |
|
1415
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $3.96M | ﹤0.01% |
25,900
| – | – |
|
1416
CALL
Ericsson
ERIC
$30.7B
| $3.94M | ﹤0.01% |
309,000
+5,100
| +2% | +$60.3K |
|
|
SAGE
1417
PUT
DELISTED
Sage Therapeutics
SAGE
| $3.94M | ﹤0.01% |
68,600
-1,500
| -2% | -$68.8K |
|
1418
PUT
Elastic
ESTC
$6.1B
| $3.93M | ﹤0.01% |
26,900
-200
| -0.7% | -$30.8K |
|
|
1419
PUT
EPAM Systems
EPAM
$4.69B
| $3.93M | ﹤0.01% |
7,700
+400
| +5% | +$235K |
|
1420
PUT
Vroom Inc
VRM
$36.9M
| $3.92M | ﹤0.01% |
1,154
| – | – |
|
1421
CALL
Booz Allen Hamilton
BAH
$8.7B
| $3.92M | ﹤0.01% |
45,500
+200
| +0.4% | +$16.7K |
|
1422
CALL
CarMax
KMX
$8.27B
| $3.92M | ﹤0.01% |
30,000
+7,200
| +32% | +$958K |
|
1423
CALL
Payoneer
PAYO
$2.41B
| $3.91M | ﹤0.01% |
389,300
+74,900
| +24% | +$728K |
|
1424
CALL
Scotiabank
BNS
$106B
| $3.9M | ﹤0.01% |
59,500
-22,500
| -27% | -$1.41M |
|
1425
CALL
Unilever
UL
$131B
| $3.9M | ﹤0.01% |
59,022
-89
| -0.2% | -$5.67K |
|
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.