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 | |
|---|---|---|---|---|---|---|
5601
PUT
ClearSign Technologies
CLIR
$24.3M
| $209K | ﹤0.01% |
4,370
+4,355
| +29,033% | +$206K |
|
|
GREK
5602
Global X MSCI Greece ETF
GREK
$300M
| $209K | ﹤0.01% |
7,535
+6,669
| +770% | +$190K |
|
5603
PUT
STAG Industrial
STAG
$7.38B
| $209K | ﹤0.01% |
5,600
+5,386
| +2,517% | +$196K |
|
5604
CALL
TechTarget
TTGT
$325M
| $209K | ﹤0.01% |
2,700
+2,687
| +20,669% | +$193K |
|
|
LTHM
5605
PUT
DELISTED
Livent Corporation
LTHM
| $209K | ﹤0.01% |
10,800
+10,656
| +7,400% | +$194K |
|
|
CSII
5606
DELISTED
Cardiovascular Systems, Inc.
CSII
| $209K | ﹤0.01% |
4,915
+4,266
| +657% | +$167K |
|
|
AUTO
5607
PUT
DELISTED
AutoWeb, Inc. Common Stock
AUTO
| $209K | ﹤0.01% |
67,000
+66,910
| +74,344% | +$185K |
|
5608
CALL
Avnet
AVT
$7.29B
| $208K | ﹤0.01% |
5,200
+4,913
| +1,712% | +$211K |
|
5609
AXIS Capital
AXS
$7.68B
| $208K | ﹤0.01% |
4,258
-5,327
| -56% | -$283K |
|
5610
PUT
CuriosityStream
CURI
$145M
| $208K | ﹤0.01% |
15,300
+14,887
| +3,605% | +$192K |
|
5611
CALL
Horizon Technology Finance
HRZN
$295M
| $208K | ﹤0.01% |
12,100
+12,096
| +302,400% | +$200K |
|
|
NOVA
5612
DELISTED
Sunnova Energy
NOVA
| $208K | ﹤0.01% |
5,528
-15,113
| -73% | -$503K |
|
5613
PUT
OceanFirst Financial
OCFC
$1.68B
| $208K | ﹤0.01% |
10,000
+9,865
| +7,307% | +$221K |
|
5614
PUT
Progress Software
PRGS
$1.66B
| $208K | ﹤0.01% |
4,500
+4,387
| +3,882% | +$199K |
|
|
SAFE
5615
Safehold
SAFE
$1.16B
| $208K | ﹤0.01% |
2,062
-2,754
| -57% | -$244K |
|
5616
Vir Biotechnology
VIR
$1.46B
| $208K | ﹤0.01% |
+4,400
| New | +$200K |
|
5617
PUT
World Acceptance Corp
WRLD
$834M
| $208K | ﹤0.01% |
1,300
+1,290
| +12,900% | +$189K |
|
|
ZEUS
5618
PUT
DELISTED
Olympic Steel
ZEUS
| $208K | ﹤0.01% |
7,100
+7,066
| +20,782% | +$223K |
|
|
PETQ
5619
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $208K | ﹤0.01% |
5,396
-10,110
| -65% | -$403K |
|
|
GRUB
5620
CALL
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $208K | ﹤0.01% |
11,400
+11,344
| +20,257% | +$1.22M |
|
5621
CALL
InfraCap MLP ETF
AMZA
$470M
| $207K | ﹤0.01% |
7,200
+7,167
| +21,718% | +$198K |
|
5622
Teucrium Corn Fund
CORN
$176M
| $207K | ﹤0.01% |
9,733
-8,339
| -46% | -$168K |
|
5623
Corbus Pharmaceuticals
CRBP
$166M
| $207K | ﹤0.01% |
3,781
+2,924
| +341% | +$162K |
|
|
IPG
5624
PUT
DELISTED
Interpublic Group of Companies
IPG
| $207K | ﹤0.01% |
6,400
+6,299
| +6,237% | +$201K |
|
5625
CALL
Dorian LPG
LPG
$2.03B
| $207K | ﹤0.01% |
14,700
+14,613
| +16,797% | +$204K |
|
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.