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 | |
|---|---|---|---|---|---|---|
5176
Sun Communities
SUI
$15.3B
| $268K | ﹤0.01% |
1,565
+1,237
| +377% | +$205K |
|
5177
InterDigital
IDCC
$7.84B
| $267K | ﹤0.01% |
+3,667
| New | +$271K |
|
|
BRFS
5178
DELISTED
BRF SA
BRFS
| $266K | ﹤0.01% |
48,643
+4,886
| +11% | +$23.3K |
|
5179
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$800M
| $266K | ﹤0.01% |
9,787
+190
| +2% | +$4.95K |
|
|
EBIX
5180
DELISTED
Ebix Inc
EBIX
| $266K | ﹤0.01% |
7,875
-1,955
| -20% | -$60.5K |
|
|
ORBC
5181
CALL
DELISTED
ORBCOMM, Inc.
ORBC
| $266K | ﹤0.01% |
23,700
+23,328
| +6,271% | +$259K |
|
5182
CALL
Bally's
BALY
$700M
| $265K | ﹤0.01% |
4,900
+4,745
| +3,061% | +$267K |
|
5183
Brookfield Renewable
BEPC
$6.04B
| $265K | ﹤0.01% |
6,340
-17,228
| -73% | -$733K |
|
5184
CALL
Seer Inc
SEER
$113M
| $265K | ﹤0.01% |
8,100
+8,098
| +404,900% | +$319K |
|
5185
CALL
Tactile Systems Technology
TCMD
$636M
| $265K | ﹤0.01% |
5,100
+5,049
| +9,900% | +$273K |
|
|
AGCB
5186
CALL
DELISTED
Altimeter Growth Corp 2
AGCB
| $265K | ﹤0.01% |
25,900
+25,798
| +25,292% | +$271K |
|
5187
Arlo Technologies
ARLO
$1.57B
| $264K | ﹤0.01% |
39,131
+14,012
| +56% | +$91.3K |
|
|
DCH
5188
PUT
Dauch Corp
DCH
$1.39B
| $264K | ﹤0.01% |
25,600
+24,871
| +3,412% | +$261K |
|
5189
CALL
Fox Factory Holding Corp
FOXF
$747M
| $264K | ﹤0.01% |
+1,700
| New | +$253K |
|
|
GAN
5190
CALL
DELISTED
GAN Ltd
GAN
| $264K | ﹤0.01% |
16,100
+15,817
| +5,589% | +$279K |
|
5191
Pegasystems
PEGA
$4.94B
| $264K | ﹤0.01% |
3,804
-3,150
| -45% | -$199K |
|
5192
CALL
System1
SST
$14.5M
| $264K | ﹤0.01% |
+2,670
| New | +$265K |
|
5193
Vanguard Morningstar Small-Cap ETF
VB
$79.6B
| $264K | ﹤0.01% |
+1,175
| New | +$260K |
|
5194
PUT
Verra Mobility
VRRM
$781M
| $264K | ﹤0.01% |
17,200
+17,012
| +9,049% | +$247K |
|
|
CIM
5195
CALL
Chimera Investment
CIM
$1.06B
| $263K | ﹤0.01% |
5,833
+5,690
| +3,979% | +$237K |
|
5196
Primoris Services
PRIM
$4.65B
| $263K | ﹤0.01% |
8,951
+6,580
| +278% | +$212K |
|
|
SNBR
5197
PUT
DELISTED
Sleep Number
SNBR
| $263K | ﹤0.01% |
+2,400
| New | +$273K |
|
|
MTBL
5198
PUT
DELISTED
Moatable, Inc. American Depositary Share (each representing forty-five (45) Class A Ordinary Shares)
MTBL
| $263K | ﹤0.01% |
220,000
+217,980
| +10,791% | +$224K |
|
5199
CALL
Advantage Solutions
ADV
$540M
| $262K | ﹤0.01% |
972
+956
| +5,975% | +$295K |
|
5200
Direxion Daily MSCI Brazil Bull 2X ETF
BRZU
$104M
| $262K | ﹤0.01% |
1,951
-1,548
| -44% | -$180K |
|
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.