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 | |
|---|---|---|---|---|---|---|
|
BIG
1176
PUT
DELISTED
Big Lots, Inc.
BIG
| $5.11M | ﹤0.01% |
77,400
+76,702
| +10,989% | +$5.11M |
|
1177
PUT
Ciena
CIEN
$54.7B
| $5.08M | ﹤0.01% |
89,400
+88,998
| +22,139% | +$4.91M |
|
1178
PUT
British American Tobacco
BTI
$132B
| $5.08M | ﹤0.01% |
129,300
+127,865
| +8,910% | +$5.01M |
|
|
MRO
1179
CALL
DELISTED
Marathon Oil Corporation
MRO
| $5.07M | ﹤0.01% |
+372,500
| New | +$4.5M |
|
1180
CALL
Global Payments
GPN
$22.1B
| $5.06M | ﹤0.01% |
27,000
+26,561
| +6,050% | +$5.34M |
|
|
NVTA
1181
PUT
DELISTED
Invitae Corporation
NVTA
| $5.06M | ﹤0.01% |
150,100
+148,272
| +8,111% | +$4.82M |
|
1182
CALL
Halliburton
HAL
$27.9B
| $5.04M | ﹤0.01% |
217,900
+214,926
| +7,227% | +$4.77M |
|
1183
CALL
Butterfly Network
BFLY
$1.73B
| $5.04M | ﹤0.01% |
347,800
+345,364
| +14,178% | +$4.66M |
|
1184
CALL
Zebra Technologies
ZBRA
$12.4B
| $5.03M | ﹤0.01% |
9,500
+9,370
| +7,208% | +$4.67M |
|
1185
PUT
iShares Convertible Bond ETF
ICVT
$7.22B
| $5.03M | ﹤0.01% |
146,600
+145,294
| +11,125% | +$14.4M |
|
1186
PUT
Advance Auto Parts
AAP
$3.34B
| $5.03M | ﹤0.01% |
+24,500
| New | +$4.81M |
|
1187
CALL
Stratasys
SSYS
$701M
| $5.02M | ﹤0.01% |
+194,100
| New | +$4.42M |
|
1188
PUT
Renaissance IPO ETF
IPO
$155M
| $5.02M | ﹤0.01% |
75,800
+75,162
| +11,781% | +$4.66M |
|
|
IPOF
1189
CALL
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $5.02M | ﹤0.01% |
491,900
+487,845
| +12,031% | +$5.03M |
|
1190
PUT
Mirion Technologies
MIR
$4.06B
| $5.01M | ﹤0.01% |
481,500
+474,376
| +6,659% | +$4.88M |
|
|
FTCH
1191
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $5M | ﹤0.01% |
99,397
-5,713
| -5% | -$271K |
|
1192
CALL
Blackstone Mortgage Trust
BXMT
$2.83B
| $5M | ﹤0.01% |
+156,900
| New | +$5.05M |
|
1193
International Paper
IP
$22.2B
| $5M | ﹤0.01% |
+86,109
| New | +$4.92M |
|
|
DENT
1194
PUT
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $5M | ﹤0.01% |
125,900
+124,897
| +12,452% | +$4.96M |
|
|
MRO
1195
PUT
DELISTED
Marathon Oil Corporation
MRO
| $4.99M | ﹤0.01% |
+366,700
| New | +$4.43M |
|
1196
PUT
Edwards Lifesciences
EW
$48.1B
| $4.99M | ﹤0.01% |
48,200
+47,910
| +16,521% | +$4.52M |
|
|
BBBY
1197
DELISTED
Bed Bath & Beyond Inc
BBBY
| $4.98M | ﹤0.01% |
+149,693
| New | +$4.16M |
|
1198
CALL
DigitalBridge
DBRG
$2.94B
| $4.97M | ﹤0.01% |
+157,375
| New | +$4.5M |
|
1199
CALL
Iron Mountain
IRM
$38.1B
| $4.97M | ﹤0.01% |
+117,500
| New | +$4.93M |
|
1200
CALL
United States Natural Gas Fund
UNG
$470M
| $4.97M | ﹤0.01% |
+94,925
| New | +$4.05M |
|
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.