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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1051
CALL
Motorola Solutions
MSI
$69.4B
| $3.74M | 0.01% |
199
+132
| +197% | +$23.6K |
|
1052
PUT
Williams Companies
WMB
$90.5B
| $3.73M | 0.01% |
1,577
+27
| +2% | +$613 |
|
|
GTM
1053
PUT
ZoomInfo Technologies
GTM
$861M
| $3.72M | 0.01% |
761
+413
| +119% | +$20.7K |
|
1054
PUT
Magnite
MGNI
$2.65B
| $3.71M | 0.01% |
893
+113
| +14% | +$4.89K |
|
1055
CALL
Ralph Lauren
RL
$22.2B
| $3.71M | 0.01% |
301
+120
| +66% | +$13.7K |
|
|
SAFM
1056
PUT
DELISTED
Sanderson Farms Inc
SAFM
| $3.71M | 0.01% |
238
+235
| +7,833% | +$34.8K |
|
1057
PUT
Campbell Soup
CPB
$6.51B
| $3.7M | 0.01% |
737
+314
| +74% | +$15K |
|
|
PDAC
1058
CALL
DELISTED
Peridot Acquisition Corp.
PDAC
| $3.7M | 0.01% |
+3,477
| New | +$40.9K |
|
1059
PUT
GSK
GSK
$103B
| $3.7M | 0.01% |
830
-415
| -33% | -$18.8K |
|
1060
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$247M
| $3.7M | 0.01% |
210,004
+38,832
| +23% | +$620K |
|
|
BFX
1061
CALL
DELISTED
BowFlex Inc.
BFX
| $3.7M | 0.01% |
2,365
+1,071
| +83% | +$23K |
|
|
FIRY
1062
CALL
Firy Inc
FIRY
$127M
| $3.7M | 0.01% |
97
-18
| -16% | -$10.3K |
|
1063
Under Armour Class C
UA
$2.92B
| $3.7M | 0.01% |
200,281
+199,012
| +15,683% | +$3.5M |
|
1064
CALL
Boston Properties
BXP
$11B
| $3.69M | 0.01% |
365
+75
| +26% | +$7.32K |
|
1065
Dollar Tree
DLTR
$23.1B
| $3.69M | 0.01% |
+32,290
| New | +$3.47M |
|
1066
CALL
Lamb Weston
LW
$6.85B
| $3.69M | 0.01% |
477
+172
| +56% | +$13.6K |
|
1067
PUT
EPAM Systems
EPAM
$4.69B
| $3.69M | 0.01% |
93
-13
| -12% | -$4.76K |
|
1068
PUT
Appian
APPN
$1.74B
| $3.68M | 0.01% |
+277
| New | +$49K |
|
|
MRTX
1069
CALL
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $3.68M | 0.01% |
215
-103
| -32% | -$20.4K |
|
1070
CALL
J.M. Smucker
SJM
$12.6B
| $3.67M | 0.01% |
290
+214
| +282% | +$25.3K |
|
1071
PUT
Nano X Imaging
NNOX
$62.4M
| $3.67M | 0.01% |
885
+212
| +32% | +$11.4K |
|
1072
PUT
Lincoln National
LNC
$7.91B
| $3.67M | 0.01% |
589
-205
| -26% | -$11.3K |
|
1073
CALL
Edgewell Personal Care
EPC
$1.27B
| $3.67M | 0.01% |
926
+908
| +5,044% | +$31.4K |
|
1074
CALL
Floor & Decor
FND
$5.81B
| $3.67M | 0.01% |
384
+241
| +169% | +$23.5K |
|
|
ORGN
1075
PUT
DELISTED
Origin Materials
ORGN
| $3.67M | 0.01% |
+121
| New | +$39.8K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.