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 | |
|---|---|---|---|---|---|---|
2051
Sunrun
RUN
$2.37B
| $1.37M | ﹤0.01% |
22,724
+17,299
| +319% | +$1.2M |
|
|
SMAR
2052
CALL
DELISTED
Smartsheet Inc.
SMAR
| $1.37M | ﹤0.01% |
215
-278
| -56% | -$19.5K |
|
2053
PUT
IQVIA
IQV
$34.7B
| $1.37M | ﹤0.01% |
+71
| New | +$13.3K |
|
2054
CALL
GDS Holdings
GDS
$6.34B
| $1.37M | ﹤0.01% |
169
-228
| -57% | -$22.7K |
|
2055
VanEck Junior Gold Miners ETF
GDXJ
$7.06B
| $1.37M | ﹤0.01% |
+30,458
| New | +$1.5M |
|
|
GES
2056
PUT
DELISTED
Guess Inc
GES
| $1.37M | ﹤0.01% |
583
-72
| -11% | -$1.77K |
|
2057
CALL
Ingersoll Rand
IR
$33B
| $1.37M | ﹤0.01% |
278
-236
| -46% | -$10.9K |
|
2058
British American Tobacco
BTI
$132B
| $1.37M | ﹤0.01% |
35,296
+7,340
| +26% | +$276K |
|
|
AVTA
2059
PUT
DELISTED
Avantax, Inc. Common Stock
AVTA
| $1.37M | ﹤0.01% |
821
+706
| +614% | +$11.8K |
|
|
PTRA
2060
CALL
DELISTED
Proterra Inc. Common Stock
PTRA
| $1.37M | ﹤0.01% |
+764
| New | +$15.8K |
|
|
CTRA
2061
PUT
DELISTED
Coterra Energy
CTRA
| $1.36M | ﹤0.01% |
+727
| New | +$13.4K |
|
2062
PUT
Mohawk Industries
MHK
$6.9B
| $1.36M | ﹤0.01% |
71
-105
| -60% | -$17.5K |
|
2063
Elastic
ESTC
$6.1B
| $1.36M | ﹤0.01% |
12,254
+11,627
| +1,854% | +$1.65M |
|
2064
SAP
SAP
$187B
| $1.36M | ﹤0.01% |
11,084
-132
| -1% | -$16.7K |
|
2065
CALL
Equinix
EQIX
$107B
| $1.36M | ﹤0.01% |
20
+4
| +25% | +$2.75K |
|
2066
CALL
Essex Property Trust
ESS
$18.9B
| $1.36M | ﹤0.01% |
50
-5
| -9% | -$1.3K |
|
|
JWN
2067
DELISTED
Nordstrom
JWN
| $1.36M | ﹤0.01% |
+35,883
| New | +$1.33M |
|
2068
CALL
Quince Therapeutics
QNCX
$17.5M
| $1.36M | ﹤0.01% |
+2
| New | +$14.4K |
|
2069
PUT
Taylor Morrison
TMHC
| $1.36M | ﹤0.01% |
+441
| New | +$12.4K |
|
2070
Helmerich & Payne
HP
$3.53B
| $1.35M | ﹤0.01% |
+50,275
| New | +$1.39M |
|
2071
PUT
Allot
ALLT
$374M
| $1.35M | ﹤0.01% |
848
+837
| +7,609% | +$12.2K |
|
2072
Curis
CRIS
$9.53M
| $1.35M | ﹤0.01% |
298
+163
| +121% | +$682K |
|
2073
PUT
Root
ROOT
$917M
| $1.35M | ﹤0.01% |
59
+12
| +26% | +$3.63K |
|
2074
PUT
LPL Financial
LPLA
$26.3B
| $1.35M | ﹤0.01% |
95
+48
| +102% | +$6.13K |
|
2075
CALL
WEC Energy
WEC
$37.7B
| $1.35M | ﹤0.01% |
144
+137
| +1,957% | +$11.9K |
|
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.