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 | |
|---|---|---|---|---|---|---|
|
DQ
976
PUT
Daqo New Energy
DQ
$806M
| $6.61M | 0.01% |
100,100
+400
| +0.4% | +$23.9K |
|
977
Mercado Libre
MELI
$91.2B
| $6.61M | 0.01% |
4,278
-800
| -16% | -$1.39M |
|
978
PUT
Ball Corp
BALL
$16.6B
| $6.61M | 0.01% |
80,200
+21,900
| +38% | +$1.94M |
|
979
Coca-Cola
KO
$349B
| $6.61M | 0.01% |
122,431
-5,200
| -4% | -$290K |
|
980
CALL
Keysight
KEYS
$55.6B
| $6.6M | 0.01% |
43,000
+1,200
| +3% | +$201K |
|
|
CTXS
981
PUT
DELISTED
Citrix Systems Inc
CTXS
| $6.6M | 0.01% |
56,200
| – | – |
|
982
CALL
UWM Holdings
UWMC
$590M
| $6.58M | 0.01% |
800,500
-10,900
| -1% | -$81.2K |
|
983
PUT
Cboe Global Markets
CBOE
$29.8B
| $6.56M | 0.01% |
55,400
+600
| +1% | +$73.3K |
|
984
Alcoa
AA
$11.9B
| $6.56M | 0.01% |
177,578
+48,022
| +37% | +$2.03M |
|
|
HOLX
985
CALL
DELISTED
Hologic
HOLX
| $6.55M | 0.01% |
96,400
+400
| +0.4% | +$30K |
|
986
United States Oil Fund
USO
$2.5B
| $6.54M | 0.01% |
129,293
+1,450
| +1% | +$70.9K |
|
987
PUT
Linde
LIN
$234B
| $6.54M | 0.01% |
22,500
-200
| -0.9% | -$60.8K |
|
988
PUT
UiPath
PATH
$5.28B
| $6.54M | 0.01% |
97,100
-100
| -0.1% | -$6.05K |
|
989
PUT
Tapestry
TPR
$28.1B
| $6.53M | 0.01% |
153,700
+10,800
| +8% | +$444K |
|
990
PUT
Bloom Energy
BE
$61.8B
| $6.53M | 0.01% |
245,300
| – | – |
|
991
Bristol-Myers Squibb
BMY
$126B
| $6.53M | 0.01% |
98,097
-70
| -0.1% | -$4.61K |
|
992
PUT
DXC Technology
DXC
$1.5B
| $6.52M | 0.01% |
161,400
| – | – |
|
993
PUT
American Eagle Outfitters
AEO
$2.86B
| $6.51M | 0.01% |
173,200
+32,100
| +23% | +$1.02M |
|
994
PUT
Automatic Data Processing
ADP
$97.1B
| $6.51M | 0.01% |
32,600
+1,000
| +3% | +$206K |
|
995
Tencent Music
TME
$14.3B
| $6.5M | 0.01% |
420,355
| – | – |
|
|
DISH
996
PUT
DELISTED
DISH Network Corp.
DISH
| $6.49M | 0.01% |
152,900
-100
| -0.1% | -$4.26K |
|
997
PUT
Fair Isaac
FICO
$28B
| $6.45M | 0.01% |
12,900
| – | – |
|
998
CALL
Howard Hughes
HHH
$3.92B
| $6.45M | 0.01% |
69,444
+2,098
| +3% | +$181K |
|
999
PUT
Editas Medicine
EDIT
$419M
| $6.45M | 0.01% |
114,100
+6,600
| +6% | +$362K |
|
|
WW
1000
CALL
DELISTED
WW International
WW
| $6.44M | 0.01% |
178,800
+200
| +0.1% | +$5.23K |
|
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.