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 | |
|---|---|---|---|---|---|---|
1801
CALL
Roper Technologies
ROP
$36.3B
| $2.68M | ﹤0.01% |
5,700
+5,688
| +47,400% | +$2.51M |
|
|
CLDR
1802
CALL
DELISTED
Cloudera, Inc.
CLDR
| $2.68M | ﹤0.01% |
+168,900
| New | +$2.3M |
|
|
K
1803
CALL
DELISTED
Kellanova
K
| $2.68M | ﹤0.01% |
44,304
+43,521
| +5,558% | +$2.64M |
|
1804
PUT
Franklin Resources
BEN
$16.9B
| $2.67M | ﹤0.01% |
83,600
+82,720
| +9,400% | +$2.68M |
|
|
VIEW
1805
CALL
DELISTED
View, Inc. Class A Common Stock
VIEW
| $2.67M | ﹤0.01% |
5,238
+5,192
| +11,287% | +$2.55M |
|
|
STOR
1806
CALL
DELISTED
STORE Capital Corporation
STOR
| $2.66M | ﹤0.01% |
77,100
+76,595
| +15,167% | +$2.67M |
|
1807
Thermo Fisher Scientific
TMO
$211B
| $2.65M | ﹤0.01% |
5,259
-3,278
| -38% | -$1.55M |
|
1808
CALL
Petco
WOOF
$745M
| $2.65M | ﹤0.01% |
118,400
+117,182
| +9,621% | +$2.74M |
|
|
SWCH
1809
CALL
DELISTED
Switch, Inc. Class A Common Stock
SWCH
| $2.65M | ﹤0.01% |
125,500
+124,995
| +24,751% | +$2.4M |
|
1810
CALL
Aramark
ARMK
$15B
| $2.64M | ﹤0.01% |
98,335
+97,381
| +10,208% | +$2.67M |
|
|
RBAC
1811
CALL
DELISTED
RedBall Acquisition Corp.
RBAC
| $2.64M | ﹤0.01% |
270,700
+265,610
| +5,218% | +$2.63M |
|
1812
PUT
Shenandoah Telecom
SHEN
$632M
| $2.64M | ﹤0.01% |
54,500
+53,909
| +9,122% | +$2.67M |
|
1813
CALL
Carlyle Group
CG
$16.3B
| $2.64M | ﹤0.01% |
56,800
+56,556
| +23,179% | +$2.41M |
|
1814
PUT
Eaton
ETN
$157B
| $2.64M | ﹤0.01% |
+17,800
| New | +$2.57M |
|
|
VXRT
1815
CALL
DELISTED
Vaxart
VXRT
| $2.64M | ﹤0.01% |
352,100
+351,085
| +34,590% | +$2.45M |
|
1816
PUT
PennyMac Financial
PFSI
$4.38B
| $2.63M | ﹤0.01% |
42,700
+42,494
| +20,628% | +$2.58M |
|
1817
Merck
MRK
$324B
| $2.63M | ﹤0.01% |
+33,780
| New | +$2.51M |
|
1818
CALL
Boston Properties
BXP
$11B
| $2.62M | ﹤0.01% |
22,900
+22,535
| +6,174% | +$2.53M |
|
1819
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $2.62M | ﹤0.01% |
65,800
+64,670
| +5,723% | +$2.53M |
|
1820
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $2.62M | ﹤0.01% |
29,700
+29,390
| +9,481% | +$2.62M |
|
1821
CALL
HubSpot
HUBS
$10.5B
| $2.62M | ﹤0.01% |
+4,500
| New | +$2.35M |
|
|
KYNB
1822
CALL
Kyntra Bio
KYNB
$28.5M
| $2.62M | ﹤0.01% |
3,936
+3,930
| +65,500% | +$2.26M |
|
|
HIMX
1823
Himax Technologies
HIMX
$2.2B
| $2.62M | ﹤0.01% |
157,243
+141,625
| +907% | +$1.87M |
|
1824
CALL
Scorpio Tankers
STNG
$3.96B
| $2.62M | ﹤0.01% |
118,800
+117,434
| +8,597% | +$2.39M |
|
|
TEN
1825
CALL
DELISTED
Tenneco Inc. Class A Voting Common Stock
TEN
| $2.62M | ﹤0.01% |
135,600
+134,437
| +11,560% | +$2.01M |
|
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.