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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2051
CALL
Playboy Inc
PLBY
$141M
| $2.18M | ﹤0.01% |
56,000
+55,846
| +36,264% | +$2.35M |
|
2052
CALL
Gevo
GEVO
$397M
| $2.17M | ﹤0.01% |
+299,100
| New | +$2.19M |
|
|
EXPR
2053
CALL
DELISTED
Express, Inc.
EXPR
| $2.17M | ﹤0.01% |
+16,750
| New | +$1.41M |
|
2054
Church & Dwight Co
CHD
$23.1B
| $2.17M | ﹤0.01% |
25,487
+24,845
| +3,870% | +$2.15M |
|
2055
CALL
Vodafone
VOD
$34.9B
| $2.17M | ﹤0.01% |
126,700
+123,062
| +3,383% | +$2.3M |
|
2056
CALL
Cheesecake Factory
CAKE
$4.21B
| $2.17M | ﹤0.01% |
40,000
+39,440
| +7,043% | +$2.28M |
|
2057
PUT
Darling Ingredients
DAR
$9.93B
| $2.17M | ﹤0.01% |
32,100
+32,089
| +291,718% | +$2.26M |
|
2058
Tower Semiconductor
TSEM
$26.4B
| $2.16M | ﹤0.01% |
73,549
+21,080
| +40% | +$592K |
|
2059
Canadian Solar
CSIQ
$906M
| $2.16M | ﹤0.01% |
48,247
+20,154
| +72% | +$825K |
|
|
STMP
2060
PUT
DELISTED
Stamps.com, Inc.
STMP
| $2.16M | ﹤0.01% |
10,800
+10,680
| +8,900% | +$2.09M |
|
2061
UiPath
PATH
$5.62B
| $2.16M | ﹤0.01% |
+31,821
| New | +$2.33M |
|
|
NTR
2062
PUT
DELISTED
NEW YORK MORTGAGE TRUST INC
NTR
| $2.16M | ﹤0.01% |
483,100
+473,674
| +5,025% | +$2.12M |
|
2063
CALL
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $2.16M | ﹤0.01% |
25,400
+25,050
| +7,157% | +$1.51M |
|
2064
PUT
Protolabs
PRLB
$1.86B
| $2.16M | ﹤0.01% |
23,500
+23,322
| +13,102% | +$2.3M |
|
|
ANSS
2065
PUT
DELISTED
Ansys
ANSS
| $2.15M | ﹤0.01% |
6,200
+6,083
| +5,199% | +$2.1M |
|
2066
Pacific Biosciences
PACB
$422M
| $2.15M | ﹤0.01% |
61,415
+17,357
| +39% | +$505K |
|
2067
CALL
National Beverage
FIZZ
$2.87B
| $2.14M | ﹤0.01% |
+45,400
| New | +$2.2M |
|
2068
Oneok
OKE
$58.7B
| $2.14M | ﹤0.01% |
+38,542
| New | +$2.05M |
|
2069
Campbell Soup
CPB
$6.51B
| $2.14M | ﹤0.01% |
47,026
+28,780
| +158% | +$1.39M |
|
2070
PUT
Krystal Biotech
KRYS
$9.88B
| $2.14M | ﹤0.01% |
+31,500
| New | +$2.2M |
|
|
AL
2071
CALL
DELISTED
Air Lease Corp
AL
| $2.14M | ﹤0.01% |
51,300
+50,746
| +9,160% | +$2.36M |
|
2072
PUT
Kodiak Sciences
KOD
$2.59B
| $2.14M | ﹤0.01% |
23,000
+22,988
| +191,567% | +$2.21M |
|
2073
CALL
Spire Global
SPIR
$425M
| $2.14M | ﹤0.01% |
+26,800
| New | +$2.13M |
|
|
VLDR
2074
PUT
DELISTED
Velodyne Lidar, Inc. Common Stock
VLDR
| $2.14M | ﹤0.01% |
201,100
+199,826
| +15,685% | +$2.36M |
|
2075
CALL
Markel Group
MKL
$25B
| $2.14M | ﹤0.01% |
1,800
+1,792
| +22,400% | +$2.15M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.