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 | |
|---|---|---|---|---|---|---|
1951
ARK Autonomous Technology & Robotics ETF
ARKQ
$1.88B
| $1.49M | ﹤0.01% |
17,723
-9,255
| -34% | -$813K |
|
1952
CALL
Steris
STE
$20.9B
| $1.49M | ﹤0.01% |
78
-11
| -12% | -$2.04K |
|
1953
PUT
Toyota
TM
$210B
| $1.48M | ﹤0.01% |
95
-94
| -50% | -$14.2K |
|
|
SGI
1954
Somnigroup International
SGI
$15.1B
| $1.47M | ﹤0.01% |
40,284
+11,393
| +39% | +$369K |
|
1955
Tower Semiconductor
TSEM
$26.4B
| $1.47M | ﹤0.01% |
52,469
+42,846
| +445% | +$1.26M |
|
1956
CALL
U-Haul Holding Co
UHAL
$14B
| $1.47M | ﹤0.01% |
240
+200
| +500% | +$10.6K |
|
1957
Comcast
CMCSA
$79.1B
| $1.47M | ﹤0.01% |
27,165
-29,082
| -52% | -$1.54M |
|
1958
CALL
Urban Outfitters
URBN
$5.99B
| $1.47M | ﹤0.01% |
+395
| New | +$12.8K |
|
1959
PUT
W.R. Berkley
WRB
$28B
| $1.47M | ﹤0.01% |
439
+333
| +314% | +$10.3K |
|
1960
PUT
Neurocrine Biosciences
NBIX
$17.7B
| $1.47M | ﹤0.01% |
151
+22
| +17% | +$2.31K |
|
1961
CALL
Idexx Laboratories
IDXX
$42.9B
| $1.47M | ﹤0.01% |
30
+9
| +43% | +$4.51K |
|
1962
CALL
Packaging Corp of America
PKG
$22.7B
| $1.47M | ﹤0.01% |
109
+102
| +1,457% | +$13.9K |
|
1963
United Rentals
URI
$71.1B
| $1.46M | ﹤0.01% |
4,444
-1,438
| -24% | -$407K |
|
|
NEWR
1964
DELISTED
New Relic, Inc.
NEWR
| $1.46M | ﹤0.01% |
23,793
+5,315
| +29% | +$353K |
|
|
ONC
1965
PUT
BeOne Medicines Ltd
ONC
$33.8B
| $1.46M | ﹤0.01% |
42
+13
| +45% | +$4.3K |
|
|
BERY
1966
PUT
DELISTED
Berry Global Group, Inc.
BERY
| $1.46M | ﹤0.01% |
259
+242
| +1,424% | +$12.6K |
|
|
JO
1967
DELISTED
iPath Series B Bloomberg Coffee Subindex Total ReturnSM ETN
JO
| $1.46M | ﹤0.01% |
40,781
+7,447
| +22% | +$276K |
|
|
WBT
1968
CALL
DELISTED
Welbilt, Inc.
WBT
| $1.46M | ﹤0.01% |
898
+131
| +17% | +$1.97K |
|
1969
CALL
Acadia Healthcare
ACHC
$3.17B
| $1.46M | ﹤0.01% |
255
+229
| +881% | +$12.4K |
|
1970
CALL
Eldorado Gold
EGO
$8.31B
| $1.46M | ﹤0.01% |
1,351
-284
| -17% | -$3.36K |
|
1971
CALL
ING
ING
$93.8B
| $1.46M | ﹤0.01% |
1,192
-409
| -26% | -$4.34K |
|
1972
PUT
The GEO Group
GEO
$4.13B
| $1.46M | ﹤0.01% |
1,877
+1,045
| +126% | +$8.59K |
|
1973
PUT
Lamb Weston
LW
$6.82B
| $1.46M | ﹤0.01% |
188
-276
| -59% | -$21.8K |
|
1974
PUT
Trex
TREX
$4.51B
| $1.46M | ﹤0.01% |
159
-136
| -46% | -$12.8K |
|
1975
CALL
Cheniere Energy
LNG
$56.5B
| $1.45M | ﹤0.01% |
202
-37
| -15% | -$2.53K |
|
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.