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 | |
|---|---|---|---|---|---|---|
|
SIEN
5301
CALL
DELISTED
Sientra, Inc.
SIEN
| $251K | ﹤0.01% |
3,160
+3,136
| +13,067% | +$223K |
|
|
PVG
5302
PUT
DELISTED
PRETIUM RESOURCES INC.
PVG
| $251K | ﹤0.01% |
26,300
+25,800
| +5,160% | +$282K |
|
5303
PUT
Lloyds Banking Group
LYG
$90.7B
| $250K | ﹤0.01% |
98,300
+96,759
| +6,279% | +$248K |
|
5304
CALL
Magnachip Semiconductor
MX
$116M
| $250K | ﹤0.01% |
10,500
+10,301
| +5,176% | +$253K |
|
5305
PUT
Nkarta
NKTX
$154M
| $250K | ﹤0.01% |
7,900
+7,899
| +789,900% | +$228K |
|
5306
RadNet
RDNT
$4.93B
| $250K | ﹤0.01% |
+7,429
| New | +$196K |
|
|
PRTK
5307
PUT
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $250K | ﹤0.01% |
36,800
+36,607
| +18,967% | +$296K |
|
5308
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$89.8M
| $249K | ﹤0.01% |
+5,743
| New | +$240K |
|
5309
PUT
Cytosorbents Corp
CTSO
$22M
| $249K | ﹤0.01% |
33,100
+32,695
| +8,073% | +$275K |
|
5310
PUT
Gates Industrial Corporation Ltd.
GTES
$6.53B
| $249K | ﹤0.01% |
13,800
+13,712
| +15,582% | +$240K |
|
5311
Momentus
MNTS
$85.1M
| $249K | ﹤0.01% |
1
| – | – |
|
5312
CALL
NGL Energy Partners
NGL
$2.01B
| $249K | ﹤0.01% |
104,700
+104,464
| +44,264% | +$234K |
|
5313
PUT
Nu Skin
NUS
$254M
| $249K | ﹤0.01% |
4,400
+4,244
| +2,721% | +$242K |
|
5314
PUT
Spire Global
SPIR
$440M
| $249K | ﹤0.01% |
+3,125
| New | +$248K |
|
|
VMEO
5315
CALL
DELISTED
Vimeo
VMEO
| $249K | ﹤0.01% |
+5,100
| New | +$234K |
|
|
ATH
5316
CALL
DELISTED
Athene Holding Ltd. Class A Common Shares
ATH
| $249K | ﹤0.01% |
3,700
+3,095
| +512% | +$186K |
|
5317
PUT
AZZ Inc
AZZ
$4.36B
| $248K | ﹤0.01% |
4,800
+4,799
| +479,900% | +$252K |
|
5318
CALL
Suburban Propane Partners
SPH
$1.23B
| $248K | ﹤0.01% |
16,200
+15,977
| +7,165% | +$239K |
|
5319
Energy Fuels
UUUU
$2.93B
| $248K | ﹤0.01% |
41,099
-71,644
| -64% | -$440K |
|
|
CEQP
5320
PUT
DELISTED
Crestwood Equity Partners LP
CEQP
| $248K | ﹤0.01% |
8,300
+8,209
| +9,021% | +$244K |
|
|
DTEA
5321
PUT
DELISTED
DAVIDsTEA Inc. Common Stock
DTEA
| $248K | ﹤0.01% |
57,100
+56,767
| +17,047% | +$220K |
|
|
GBT
5322
PUT
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $248K | ﹤0.01% |
7,100
+6,675
| +1,571% | +$261K |
|
|
CVGW
5323
CALL
DELISTED
Calavo Growers
CVGW
| $247K | ﹤0.01% |
3,900
+3,891
| +43,233% | +$286K |
|
|
FPI
5324
CALL
Farmland Partners
FPI
$411M
| $247K | ﹤0.01% |
20,500
+20,396
| +19,612% | +$262K |
|
5325
PUT
Ichor Holdings
ICHR
$2.61B
| $247K | ﹤0.01% |
4,600
+4,581
| +24,111% | +$252K |
|
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.