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 | |
|---|---|---|---|---|---|---|
2226
PUT
Main Street Capital
MAIN
$4.97B
| $1.16M | ﹤0.01% |
297
+83
| +39% | +$2.91K |
|
2227
PUT
Owens Corning
OC
$11.5B
| $1.16M | ﹤0.01% |
126
+27
| +27% | +$2.26K |
|
2228
PUT
Globus Medical
GMED
$10.4B
| $1.16M | ﹤0.01% |
188
+170
| +944% | +$10.8K |
|
2229
Ameresco
AMRC
$1.15B
| $1.16M | ﹤0.01% |
23,800
-3,246
| -12% | -$179K |
|
2230
PUT
PetMed Express
PETS
$42.5M
| $1.16M | ﹤0.01% |
329
+72
| +28% | +$2.5K |
|
2231
CALL
United Microelectronic
UMC
$48.9B
| $1.16M | ﹤0.01% |
1,271
+25
| +2% | +$231 |
|
2232
PUT
Axos Financial
AX
$5.45B
| $1.16M | ﹤0.01% |
246
+180
| +273% | +$8.11K |
|
2233
PUT
Alto Ingredients
ALTO
$360M
| $1.15M | ﹤0.01% |
2,123
-202
| -9% | -$1.34K |
|
2234
PUT
Madison Square Garden
MSGS
$9.54B
| $1.15M | ﹤0.01% |
+64
| New | +$11.8K |
|
2235
CALL
Arthur J. Gallagher & Co
AJG
$63.7B
| $1.15M | ﹤0.01% |
92
+1
| +1% | +$121 |
|
2236
PUT
Woodward
WWD
$25B
| $1.15M | ﹤0.01% |
+95
| New | +$11.3K |
|
2237
PUT
Energy Fuels
UUUU
$2.82B
| $1.14M | ﹤0.01% |
2,015
-124
| -6% | -$634 |
|
|
STOR
2238
PUT
DELISTED
STORE Capital Corporation
STOR
| $1.14M | ﹤0.01% |
341
-313
| -48% | -$10.2K |
|
|
CRON
2239
Cronos Group
CRON
$1.05B
| $1.14M | ﹤0.01% |
+120,666
| New | +$1.28M |
|
2240
CALL
Equinox Gold
EQX
$7.32B
| $1.14M | ﹤0.01% |
1,428
+491
| +52% | +$4.54K |
|
|
FLIR
2241
DELISTED
FLIR Systems, Inc. (DE) Common Stock
FLIR
| $1.14M | ﹤0.01% |
20,189
-12,558
| -38% | -$682K |
|
2242
CALL
CBRE Group
CBRE
$40.8B
| $1.14M | ﹤0.01% |
144
-590
| -80% | -$41.7K |
|
2243
CALL
EverQuote
EVER
$886M
| $1.14M | ﹤0.01% |
314
+233
| +288% | +$9.92K |
|
2244
CALL
Celanese
CE
$5.09B
| $1.14M | ﹤0.01% |
76
-194
| -72% | -$26.6K |
|
|
BPY
2245
PUT
DELISTED
Brookfield Property Partners L.P. Limited Partnership Units
BPY
| $1.14M | ﹤0.01% |
640
-852
| -57% | -$14.9K |
|
|
MPT
2246
CALL
Medical Properties Trust
MPT
$2.89B
| $1.14M | ﹤0.01% |
534
-170
| -24% | -$3.66K |
|
2247
CALL
Kartoon Studios
TOON
$34.3M
| $1.14M | ﹤0.01% |
586
+182
| +45% | +$3.46K |
|
2248
Vroom Inc
VRM
$36.9M
| $1.13M | ﹤0.01% |
363
-298
| -45% | -$965K |
|
2249
PUT
Hormel Foods
HRL
$13.9B
| $1.13M | ﹤0.01% |
237
-106
| -31% | -$5.01K |
|
|
SI
2250
DELISTED
Silvergate Capital Corporation
SI
| $1.13M | ﹤0.01% |
+7,953
| New | +$943K |
|
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.