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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1026
PUT
Clorox
CLX
$11.5B
| $6.04M | 0.01% |
33,600
+33,320
| +11,900% | +$6.08M |
|
1027
PUT
United States Natural Gas Fund
UNG
$477M
| $6.04M | 0.01% |
+115,500
| New | +$4.93M |
|
1028
PUT
Suncor Energy
SU
$78.5B
| $6.03M | 0.01% |
+251,500
| New | +$5.77M |
|
1029
PUT
Huntington Ingalls Industries
HII
$11.5B
| $6.03M | 0.01% |
28,600
+28,305
| +9,595% | +$6.03M |
|
1030
CALL
Western Alliance Bancorporation
WAL
$8.97B
| $6.03M | 0.01% |
64,900
+64,570
| +19,567% | +$6.4M |
|
1031
CALL
American International
AIG
$41.7B
| $6.02M | 0.01% |
+126,500
| New | +$6.26M |
|
|
AYX
1032
CALL
DELISTED
Alteryx Inc
AYX
| $6M | 0.01% |
69,800
+69,374
| +16,285% | +$5.68M |
|
1033
CALL
Wolfspeed
WOLF
$1.26B
| $6M | 0.01% |
61,300
+60,883
| +14,600% | +$6.14M |
|
1034
Gilead Sciences
GILD
$162B
| $6M | 0.01% |
87,148
-53,052
| -38% | -$3.54M |
|
1035
PUT
Builders FirstSource
BLDR
$7.72B
| $5.99M | 0.01% |
140,300
+140,220
| +175,275% | +$6.5M |
|
1036
PUT
GoDaddy
GDDY
$12.2B
| $5.98M | 0.01% |
68,800
+67,555
| +5,426% | +$5.64M |
|
1037
CALL
CoStar Group
CSGP
$11.2B
| $5.95M | 0.01% |
+71,900
| New | +$6.22M |
|
1038
PUT
DuPont de Nemours
DD
$18.6B
| $5.95M | 0.01% |
61,264
+59,836
| +4,190% | +$6.01M |
|
1039
CALL
O'Reilly Automotive
ORLY
$71.8B
| $5.95M | 0.01% |
157,500
+156,330
| +13,362% | +$5.61M |
|
1040
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $5.94M | 0.01% |
12,100
+11,922
| +6,698% | +$5.88M |
|
1041
iQIYI
IQ
$1.17B
| $5.94M | 0.01% |
381,006
+280,267
| +278% | +$4.17M |
|
1042
CALL
Sunrun
RUN
$2.39B
| $5.93M | 0.01% |
106,260
+104,487
| +5,893% | +$5.05M |
|
1043
PUT
Azenta
AZTA
$1.29B
| $5.93M | 0.01% |
+62,200
| New | +$6.03M |
|
1044
PUT
Ralph Lauren
RL
$22B
| $5.92M | 0.01% |
50,300
+50,042
| +19,396% | +$6.26M |
|
|
HZNP
1045
PUT
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $5.91M | 0.01% |
+63,100
| New | +$5.81M |
|
1046
PUT
PVH
PVH
$3.61B
| $5.91M | 0.01% |
+54,900
| New | +$6.03M |
|
1047
PUT
Camping World
CWH
$352M
| $5.88M | 0.01% |
143,400
+141,935
| +9,688% | +$5.87M |
|
1048
PUT
Franco-Nevada
FNV
$41.6B
| $5.86M | 0.01% |
+40,400
| New | +$5.85M |
|
1049
PUT
Equity Residential
EQR
$25.7B
| $5.86M | 0.01% |
76,100
+75,516
| +12,931% | +$5.71M |
|
1050
Okta
OKTA
$23.9B
| $5.86M | 0.01% |
23,933
+2,286
| +11% | +$552K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.