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 | |
|---|---|---|---|---|---|---|
|
TEF
4251
DELISTED
Telefonica
TEF
| $275K | ﹤0.01% |
68,444
+27,675
| +68% | +$113K |
|
4252
Western Midstream Partners
WES
$19.4B
| $275K | ﹤0.01% |
+14,800
| New | +$252K |
|
4253
PUT
WisdomTree
WT
$2.79B
| $275K | ﹤0.01% |
440
+315
| +252% | +$1.8K |
|
|
ECOM
4254
CALL
DELISTED
CHANNELADVISOR CORPORATION
ECOM
| $275K | ﹤0.01% |
117
-144
| -55% | -$3.18K |
|
|
DMC
4255
PUT
Del Monte Corp
DMC
$1.42B
| $274K | ﹤0.01% |
96
-47
| -33% | -$1.25K |
|
4256
PUT
Future FinTech Group
FTFT
$1.74M
| $274K | ﹤0.01% |
+1
| New | +$4.72K |
|
4257
CALL
Pluri
PLUR
$17M
| $274K | ﹤0.01% |
72
-264
| -79% | -$13.8K |
|
|
4258
PUT
Pluri
PLUR
$17M
| $274K | ﹤0.01% |
72
+64
| +800% | +$3.36K |
|
4259
PUT
Star Bulk Carriers
SBLK
$3.05B
| $274K | ﹤0.01% |
187
+41
| +28% | +$529 |
|
4260
CALL
SandRidge Energy
SD
$503M
| $274K | ﹤0.01% |
702
+550
| +362% | +$2.5K |
|
4261
PUT
Wave Life Sciences
WVE
$1.12B
| $274K | ﹤0.01% |
490
+68
| +16% | +$653 |
|
|
ACGN
4262
DELISTED
Aceragen Inc
ACGN
| $274K | ﹤0.01% |
12,433
+12,264
| +7,257% | +$919K |
|
4263
Booz Allen Hamilton
BAH
$8.44B
| $273K | ﹤0.01% |
+3,401
| New | +$285K |
|
|
HEES
4264
CALL
DELISTED
H&E Equipment Services
HEES
| $273K | ﹤0.01% |
72
-19
| -21% | -$608 |
|
4265
Herc Holdings
HRI
$4.78B
| $273K | ﹤0.01% |
2,704
+1,812
| +203% | +$147K |
|
4266
PUT
Howmet Aerospace
HWM
$109B
| $273K | ﹤0.01% |
87
-168
| -66% | -$4.84K |
|
4267
CALL
Progress Software
PRGS
$1.75B
| $273K | ﹤0.01% |
62
+42
| +210% | +$1.84K |
|
4268
CenterPoint Energy
CNP
$28.3B
| $272K | ﹤0.01% |
12,021
-21,778
| -64% | -$464K |
|
|
MTTR
4269
PUT
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $272K | ﹤0.01% |
+199
| New | +$3.17K |
|
|
ORBC
4270
DELISTED
ORBCOMM, Inc.
ORBC
| $272K | ﹤0.01% |
35,672
+13,373
| +60% | +$105K |
|
4271
CALL
Flowserve
FLS
$8.94B
| $271K | ﹤0.01% |
70
+22
| +46% | +$845 |
|
4272
CALL
MarineMax
HZO
$748M
| $271K | ﹤0.01% |
55
-96
| -64% | -$4.53K |
|
|
CBD
4273
CALL
DELISTED
Companhia Brasileira de Distribuicao
CBD
| $271K | ﹤0.01% |
466
+444
| +2,018% | +$5.38K |
|
4274
Nu Skin
NUS
$257M
| $270K | ﹤0.01% |
5,106
-2,325
| -31% | -$127K |
|
4275
CALL
Sunoco
SUN
$14.4B
| $270K | ﹤0.01% |
85
-1,219
| -93% | -$38.1K |
|
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.