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 | |
|---|---|---|---|---|---|---|
5026
CALL
Icahn Enterprises
IEP
$5.18B
| $291K | ﹤0.01% |
5,300
+5,186
| +4,549% | +$295K |
|
5027
CALL
Lindblad Expeditions
LIND
$1.95B
| $291K | ﹤0.01% |
18,200
+17,661
| +3,277% | +$299K |
|
|
MIXT
5028
CALL
DELISTED
MIX TELEMATICS LIMITED
MIXT
| $291K | ﹤0.01% |
17,600
+17,588
| +146,567% | +$248K |
|
|
SWIR
5029
DELISTED
Sierra Wireless
SWIR
| $291K | ﹤0.01% |
15,376
-31,332
| -67% | -$488K |
|
5030
Green Brick Partners
GRBK
$3.03B
| $290K | ﹤0.01% |
12,770
+15
| +0.1% | +$359 |
|
5031
CALL
Portland General Electric
POR
$5.8B
| $290K | ﹤0.01% |
6,300
+6,229
| +8,773% | +$306K |
|
5032
CALL
Rollins
ROL
$18.5B
| $290K | ﹤0.01% |
8,500
+8,402
| +8,573% | +$293K |
|
|
ATH
5033
PUT
DELISTED
Athene Holding Ltd. Class A Common Shares
ATH
| $290K | ﹤0.01% |
4,300
+4,068
| +1,753% | +$245K |
|
5034
CALL
Gibraltar Industries
ROCK
$1.27B
| $289K | ﹤0.01% |
3,800
+3,703
| +3,818% | +$306K |
|
|
AJRD
5035
CALL
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $289K | ﹤0.01% |
+6,000
| New | +$288K |
|
5036
Alta Equipment Group
ALTG
$197M
| $288K | ﹤0.01% |
21,693
-4,091
| -16% | -$55.9K |
|
5037
PUT
Carriage Services
CSV
$637M
| $288K | ﹤0.01% |
7,800
+7,774
| +29,900% | +$290K |
|
|
HYFT
5038
CALL
MindWalk Holdings
HYFT
$63.1M
| $288K | ﹤0.01% |
+47,900
| New | +$405K |
|
5039
PUT
Mitek Systems
MITK
$771M
| $288K | ﹤0.01% |
+15,000
| New | +$252K |
|
5040
Ubiquiti
UI
$32.3B
| $288K | ﹤0.01% |
923
+772
| +511% | +$226K |
|
5041
CALL
W&T Offshore
WTI
$515M
| $288K | ﹤0.01% |
+59,400
| New | +$229K |
|
|
SILV
5042
CALL
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $288K | ﹤0.01% |
33,000
+32,888
| +29,364% | +$301K |
|
|
EVA
5043
DELISTED
Enviva Inc.
EVA
| $288K | ﹤0.01% |
5,499
+1,925
| +54% | +$94.9K |
|
|
HMHC
5044
PUT
DELISTED
Houghton Mifflin Harcourt Company
HMHC
| $288K | ﹤0.01% |
+26,100
| New | +$246K |
|
|
SRAX
5045
CALL
DELISTED
SRAX, Inc. Class A Common Stock
SRAX
| $288K | ﹤0.01% |
53,100
+52,632
| +11,246% | +$253K |
|
5046
Alector
ALEC
$180M
| $287K | ﹤0.01% |
13,821
+10,197
| +281% | +$192K |
|
5047
Heritage Insurance Holdings
HRTG
$907M
| $287K | ﹤0.01% |
33,542
-39,416
| -54% | -$363K |
|
5048
PUT
Pluri
PLUR
$16.8M
| $287K | ﹤0.01% |
9,088
+9,016
| +12,522% | +$299K |
|
5049
AgEagle Aerial Systems
UAVS
$41.9M
| $287K | ﹤0.01% |
55
-13
| -19% | -$71.3K |
|
|
WPRT
5050
Westport Fuel Systems
WPRT
$32.7M
| $287K | ﹤0.01% |
5,423
+1,127
| +26% | +$68K |
|
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.