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 | |
|---|---|---|---|---|---|---|
901
PUT
Regency Centers
REG
$14.9B
| $7.23M | 0.01% |
112,900
+111,897
| +11,156% | +$7.08M |
|
902
Moderna
MRNA
$22.6B
| $7.23M | 0.01% |
+30,775
| New | +$5.5M |
|
903
PUT
Ferrari
RACE
$63.2B
| $7.21M | 0.01% |
35,000
+34,622
| +9,159% | +$7.22M |
|
904
PUT
Diageo
DEO
$45.7B
| $7.21M | 0.01% |
37,600
+37,381
| +17,069% | +$6.95M |
|
|
B
905
Barrick Mining
B
$62.3B
| $7.18M | 0.01% |
347,183
-185,853
| -35% | -$4.19M |
|
906
Chewy
CHWY
$8.38B
| $7.17M | 0.01% |
90,012
+63,928
| +245% | +$4.94M |
|
907
CALL
Cedar Fair
FUN
$1.76B
| $7.17M | 0.01% |
159,900
+158,471
| +11,090% | +$7.51M |
|
908
CALL
Realty Income
O
$60.4B
| $7.17M | 0.01% |
110,837
+110,249
| +18,750% | +$7.24M |
|
909
Radware
RDWR
$1.22B
| $7.12M | 0.01% |
231,259
+181,125
| +361% | +$5.22M |
|
910
PUT
American International
AIG
$41.4B
| $7.11M | 0.01% |
+149,400
| New | +$7.39M |
|
911
CALL
Box
BOX
$3.92B
| $7.08M | 0.01% |
277,200
+273,169
| +6,777% | +$6.37M |
|
912
CALL
Novartis
NVS
$297B
| $7.08M | 0.01% |
77,600
+76,526
| +7,125% | +$6.81M |
|
913
PUT
CF Industries
CF
$19.5B
| $7.08M | 0.01% |
137,600
+136,141
| +9,331% | +$6.92M |
|
914
DraftKings
DKNG
$11.3B
| $7.08M | 0.01% |
135,676
-39,198
| -22% | -$2.07M |
|
915
CALL
CSX Corp
CSX
$98.1B
| $7.07M | 0.01% |
+220,500
| New | +$7.27M |
|
916
PUT
HSBC
HSBC
$349B
| $7.07M | 0.01% |
244,900
+243,423
| +16,481% | +$7.43M |
|
917
CALL
Affirm
AFRM
$23.8B
| $7.04M | 0.01% |
104,600
+103,147
| +7,099% | +$6.58M |
|
918
PUT
Steel Dynamics
STLD
$34.7B
| $7.03M | 0.01% |
118,000
+117,229
| +15,205% | +$6.88M |
|
919
Southwest Airlines
LUV
$21.9B
| $7.02M | 0.01% |
132,154
-5,403
| -4% | -$324K |
|
920
CALL
Dollar General
DG
$25.4B
| $7.01M | 0.01% |
32,400
+31,507
| +3,528% | +$6.62M |
|
921
PUT
Invesco Aerospace & Defense ETF
PPA
$8.22B
| $7.01M | 0.01% |
75,200
+74,324
| +8,484% | +$5.59M |
|
922
CALL
General Mills
GIS
$19B
| $6.99M | 0.01% |
114,800
+113,221
| +7,170% | +$7M |
|
923
CALL
Stanley Black & Decker
SWK
$13.6B
| $6.99M | 0.01% |
34,100
+33,717
| +8,803% | +$6.99M |
|
924
PUT
Halliburton
HAL
$27.3B
| $6.99M | 0.01% |
302,200
+299,440
| +10,849% | +$6.65M |
|
925
Workday
WDAY
$31.6B
| $6.97M | 0.01% |
+29,201
| New | +$7.02M |
|
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.