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 | |
|---|---|---|---|---|---|---|
|
AZUL
2126
CALL
DELISTED
Azul
AZUL
| $1.28M | ﹤0.01% |
+634
| New | +$13.8K |
|
2127
PUT
Playboy Inc
PLBY
$141M
| $1.28M | ﹤0.01% |
+653
| New | +$8.85K |
|
2128
CALL
Annaly Capital Management
NLY
$16.9B
| $1.28M | ﹤0.01% |
372
+238
| +178% | +$8.06K |
|
2129
CALL
Bankunited
BKU
$3.38B
| $1.27M | ﹤0.01% |
290
+263
| +974% | +$10.8K |
|
2130
PUT
Box
BOX
$4.02B
| $1.27M | ﹤0.01% |
555
+346
| +166% | +$6.74K |
|
2131
CALL
Huntsman Corp
HUN
$2.24B
| $1.27M | ﹤0.01% |
441
+164
| +59% | +$4.59K |
|
2132
Invesco WilderHill Clean Energy ETF
PBW
$390M
| $1.27M | ﹤0.01% |
12,923
-7,029
| -35% | -$803K |
|
2133
CALL
Cincinnati Financial
CINF
$28.3B
| $1.27M | ﹤0.01% |
123
+15
| +14% | +$1.44K |
|
2134
Fortive
FTV
$19B
| $1.27M | ﹤0.01% |
23,801
+5,707
| +32% | +$295K |
|
2135
PUT
Stryker
SYK
$127B
| $1.27M | ﹤0.01% |
52
-219
| -81% | -$52.5K |
|
2136
CALL
Academy Sports + Outdoors
ASO
$2.89B
| $1.26M | ﹤0.01% |
469
+28
| +6% | +$670 |
|
|
CTRA
2137
DELISTED
Coterra Energy
CTRA
| $1.26M | ﹤0.01% |
67,224
-36,363
| -35% | -$670K |
|
2138
Eagle Materials
EXP
$6.6B
| $1.26M | ﹤0.01% |
+9,394
| New | +$1.14M |
|
|
LSI
2139
DELISTED
Life Storage, Inc.
LSI
| $1.26M | ﹤0.01% |
14,661
+6,102
| +71% | +$507K |
|
|
TGI
2140
CALL
DELISTED
Triumph Group
TGI
| $1.26M | ﹤0.01% |
685
+489
| +249% | +$7.3K |
|
|
THCA
2141
DELISTED
Tuscan Holdings Corp. II Common Stock
THCA
| $1.26M | ﹤0.01% |
+124,808
| New | +$1.33M |
|
2142
CALL
Trane Technologies
TT
$106B
| $1.26M | ﹤0.01% |
76
-25
| -25% | -$3.87K |
|
|
HOLX
2143
CALL
DELISTED
Hologic
HOLX
| $1.26M | ﹤0.01% |
169
+61
| +56% | +$4.63K |
|
2144
CALL
Takeda Pharmaceutical
TAK
$55.1B
| $1.26M | ﹤0.01% |
688
+10
| +1% | +$180 |
|
2145
PUT
Bank OZK
OZK
$5.49B
| $1.25M | ﹤0.01% |
307
+18
| +6% | +$709 |
|
2146
Invesco DB Commodity Index Tracking Fund
DBC
$1.73B
| $1.25M | ﹤0.01% |
75,246
+54,738
| +267% | +$887K |
|
2147
PUT
Veru
VERU
$36.1M
| $1.25M | ﹤0.01% |
116
+23
| +25% | +$2.9K |
|
2148
PUT
PPG Industries
PPG
$25.9B
| $1.25M | ﹤0.01% |
83
-142
| -63% | -$20.3K |
|
2149
CALL
Skywest
SKYW
$4.11B
| $1.25M | ﹤0.01% |
229
+36
| +19% | +$1.77K |
|
|
TEN
2150
CALL
DELISTED
Tenneco Inc. Class A Voting Common Stock
TEN
| $1.25M | ﹤0.01% |
1,163
+548
| +89% | +$5.99K |
|
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.