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 | |
|---|---|---|---|---|---|---|
4226
PUT
Insmed
INSM
$22.6B
| $483K | ﹤0.01% |
17,000
+16,827
| +9,727% | +$499K |
|
4227
PUT
VICI Properties
VICI
$29.8B
| $483K | ﹤0.01% |
15,600
+15,473
| +12,183% | +$480K |
|
4228
CALL
United States Copper Index Fund
CPER
$742M
| $482K | ﹤0.01% |
18,400
+18,390
| +183,900% | +$499K |
|
4229
Mohawk Industries
MHK
$7.14B
| $482K | ﹤0.01% |
2,511
+1,744
| +227% | +$355K |
|
|
UXIN
4230
Uxin Ltd
UXIN
$315M
| $482K | ﹤0.01% |
1,254
+462
| +58% | +$139K |
|
4231
uniQure
QURE
$2.52B
| $481K | ﹤0.01% |
15,618
+5,934
| +61% | +$199K |
|
|
RC
4232
PUT
Ready Capital
RC
$261M
| $481K | ﹤0.01% |
30,360
+30,095
| +11,357% | +$446K |
|
|
TBCH
4233
CALL
Turtle Beach Corp
TBCH
$258M
| $481K | ﹤0.01% |
15,100
+14,926
| +8,578% | +$452K |
|
|
LEV
4234
DELISTED
The Lion Electric Company
LEV
| $481K | ﹤0.01% |
+24,760
| New | +$464K |
|
|
CAN
4235
Canaan Creative
CAN
$178M
| $480K | ﹤0.01% |
58,942
-177,640
| -75% | -$2.02M |
|
4236
Eterna Therapeutics
ERNA
$4.21M
| $480K | ﹤0.01% |
+4
| New | +$576K |
|
|
TRVG
4237
trivago
TRVG
$387M
| $479K | ﹤0.01% |
28,972
-6,703
| -19% | -$124K |
|
4238
First Trust NASDAQ Cybersecurity ETF
CIBR
$14B
| $477K | ﹤0.01% |
10,209
+7,405
| +264% | +$329K |
|
4239
CALL
Frontline
FRO
$8.63B
| $477K | ﹤0.01% |
53,000
+52,666
| +15,768% | +$424K |
|
|
SPI
4240
CALL
DELISTED
SPI Energy Co., Ltd. Ordinary Shares
SPI
| $477K | ﹤0.01% |
71,500
+70,702
| +8,860% | +$453K |
|
4241
Banco Bradesco
BBD
$38.3B
| $476K | ﹤0.01% |
102,182
-109,875
| -52% | -$478K |
|
|
SLCA
4242
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $476K | ﹤0.01% |
41,206
+31,253
| +314% | +$362K |
|
4243
CALL
B2Gold
BTG
$5.12B
| $475K | ﹤0.01% |
112,900
+112,005
| +12,515% | +$547K |
|
|
PLYA
4244
CALL
DELISTED
Playa Hotels & Resorts
PLYA
| $475K | ﹤0.01% |
64,000
+63,711
| +22,045% | +$470K |
|
4245
Porch Group
PRCH
$1.38B
| $475K | ﹤0.01% |
24,598
+21,938
| +825% | +$362K |
|
4246
PUT
Seres Therapeutics
MCRB
$46.5M
| $474K | ﹤0.01% |
995
+993
| +49,650% | +$419K |
|
|
SOLO
4247
CALL
DELISTED
Electrameccanica Vehicles Corp. Ltd.
SOLO
| $474K | ﹤0.01% |
111,100
+110,389
| +15,526% | +$454K |
|
|
DENN
4248
CALL
DELISTED
Denny's
DENN
| $473K | ﹤0.01% |
28,700
+28,543
| +18,180% | +$499K |
|
|
API
4249
Agora
API
$333M
| $472K | ﹤0.01% |
11,260
+3,642
| +48% | +$168K |
|
|
UCTT
4250
PUT
Ultra Clean Holdings
UCTT
$3.47B
| $472K | ﹤0.01% |
+8,800
| New | +$471K |
|
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.