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 | |
|---|---|---|---|---|---|---|
2151
PUT
Macerich
MAC
$7.32B
| $2.01M | ﹤0.01% |
+110,000
| New | +$1.65M |
|
2152
CALL
PBF Energy
PBF
$7.29B
| $2.01M | ﹤0.01% |
+131,200
| New | +$2.03M |
|
2153
CALL
Sturm, Ruger & Co
RGR
$610M
| $2.01M | ﹤0.01% |
22,300
+22,088
| +10,419% | +$1.66M |
|
|
OTLY
2154
CALL
Oatly Group
OTLY
$417M
| $2M | ﹤0.01% |
+4,100
| New | +$2.04M |
|
2155
PUT
IPG Photonics
IPGP
$3.89B
| $2M | ﹤0.01% |
9,500
+9,483
| +55,782% | +$2M |
|
2156
CALL
Ovintiv
OVV
$17.5B
| $2M | ﹤0.01% |
63,580
+62,022
| +3,981% | +$1.67M |
|
2157
DXC Technology
DXC
$1.63B
| $2M | ﹤0.01% |
51,334
+40,260
| +364% | +$1.44M |
|
2158
Tenet Healthcare
THC
$20.1B
| $2M | ﹤0.01% |
+29,825
| New | +$1.85M |
|
2159
EPR Properties
EPR
$4.86B
| $2M | ﹤0.01% |
37,897
-716
| -2% | -$35.6K |
|
2160
PUT
Teradyne
TER
$54.8B
| $2M | ﹤0.01% |
14,900
+14,681
| +6,704% | +$1.88M |
|
2161
Workhorse Group
WKHS
$29.5M
| $1.99M | ﹤0.01% |
40
+39
| +3,900% | +$1.44M |
|
|
INOV
2162
DELISTED
Inovalon Holdings, Inc. Class A Common Stock
INOV
| $1.99M | ﹤0.01% |
58,481
+55,047
| +1,603% | +$1.7M |
|
2163
CALL
Arrow Electronics
ARW
$10.9B
| $1.99M | ﹤0.01% |
17,500
+17,466
| +51,371% | +$2.05M |
|
2164
PUT
BARK
BARK
$74.8M
| $1.99M | ﹤0.01% |
8,990
+8,885
| +8,462% | +$1.92M |
|
|
VRE
2165
CALL
DELISTED
Veris Residential
VRE
| $1.99M | ﹤0.01% |
116,200
+116,153
| +247,134% | +$1.95M |
|
|
HZON
2166
PUT
DELISTED
Horizon Acquisition Corporation II
HZON
| $1.99M | ﹤0.01% |
203,700
+200,276
| +5,849% | +$2M |
|
|
VSTO
2167
CALL
DELISTED
Vista Outdoor Inc.
VSTO
| $1.99M | ﹤0.01% |
+43,000
| New | +$1.63M |
|
2168
Invesco Solar ETF
TAN
$1.47B
| $1.99M | ﹤0.01% |
22,271
-5,327
| -19% | -$433K |
|
2169
Williams-Sonoma
WSM
$26.7B
| $1.99M | ﹤0.01% |
24,924
+11,196
| +82% | +$953K |
|
2170
CALL
Bloom Energy
BE
$52.6B
| $1.99M | ﹤0.01% |
74,000
+73,317
| +10,735% | +$1.78M |
|
2171
CALL
Star Bulk Carriers
SBLK
$3.14B
| $1.99M | ﹤0.01% |
86,600
+85,933
| +12,884% | +$1.7M |
|
2172
CALL
Urban Outfitters
URBN
$5.99B
| $1.99M | ﹤0.01% |
48,200
+47,805
| +12,103% | +$1.8M |
|
2173
PUT
TD Synnex
SNX
$19.4B
| $1.98M | ﹤0.01% |
16,300
+16,272
| +58,114% | +$2M |
|
2174
PUT
Vuzix
VUZI
$190M
| $1.98M | ﹤0.01% |
107,800
+106,020
| +5,956% | +$2.14M |
|
|
SLCA
2175
PUT
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $1.98M | ﹤0.01% |
171,000
+169,373
| +10,410% | +$1.96M |
|
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.