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 | |
|---|---|---|---|---|---|---|
1251
CALL
New Oriental
EDU
$7.84B
| $4.63M | ﹤0.01% |
56,550
+56,256
| +19,135% | +$6.83M |
|
1252
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.2M
| $4.63M | ﹤0.01% |
58,500
+57,811
| +8,391% | +$4.62M |
|
|
RDFN
1253
CALL
DELISTED
Redfin
RDFN
| $4.63M | ﹤0.01% |
+73,000
| New | +$4.46M |
|
1254
PUT
SBA Communications
SBAC
$18.4B
| $4.62M | ﹤0.01% |
+14,500
| New | +$4.35M |
|
1255
CALL
Church & Dwight Co
CHD
$23.1B
| $4.62M | ﹤0.01% |
54,200
+53,723
| +11,263% | +$4.65M |
|
1256
CALL
Ternium
TX
$9.29B
| $4.61M | ﹤0.01% |
119,800
+119,702
| +122,145% | +$4.57M |
|
1257
SLB Ltd
SLB
$78.4B
| $4.61M | ﹤0.01% |
143,877
-69,708
| -33% | -$2.14M |
|
1258
CALL
Qorvo
QRVO
$7.63B
| $4.6M | ﹤0.01% |
+23,500
| New | +$4.33M |
|
1259
CALL
Synchrony
SYF
$23.7B
| $4.59M | ﹤0.01% |
94,700
+93,526
| +7,966% | +$4.26M |
|
|
NUAN
1260
PUT
DELISTED
Nuance Communications, Inc.
NUAN
| $4.59M | ﹤0.01% |
84,400
+83,083
| +6,309% | +$4.38M |
|
1261
CALL
Immunovant
IMVT
$8.09B
| $4.59M | ﹤0.01% |
434,400
+434,365
| +1,241,043% | +$6.06M |
|
1262
PUT
Proshares UltraShort Technology
REW
$3.48M
| $4.59M | ﹤0.01% |
24,669
+24,267
| +6,037% | +$4.29M |
|
1263
PUT
Natera
NTRA
$37.5B
| $4.59M | ﹤0.01% |
40,400
+40,390
| +403,900% | +$4.13M |
|
1264
CALL
L3Harris
LHX
$55.9B
| $4.58M | ﹤0.01% |
21,200
+21,074
| +16,725% | +$4.53M |
|
1265
CALL
Opendoor
OPEN
$3.69B
| $4.57M | ﹤0.01% |
394,217
+391,237
| +13,129% | +$6.72M |
|
1266
PUT
CoStar Group
CSGP
$11.3B
| $4.56M | ﹤0.01% |
+55,100
| New | +$4.76M |
|
1267
PUT
ON Semiconductor
ON
$33.8B
| $4.56M | ﹤0.01% |
+119,100
| New | +$4.68M |
|
1268
PUT
Campbell Soup
CPB
$6.51B
| $4.55M | ﹤0.01% |
99,800
+99,063
| +13,441% | +$4.77M |
|
1269
PUT
Synaptics
SYNA
$4.41B
| $4.53M | ﹤0.01% |
29,100
+29,091
| +323,233% | +$3.93M |
|
1270
Bausch Health
BHC
$1.65B
| $4.52M | ﹤0.01% |
154,250
-15,468
| -9% | -$469K |
|
|
AGC
1271
CALL
DELISTED
Altimeter Growth Corp
AGC
| $4.52M | ﹤0.01% |
386,500
+384,927
| +24,471% | +$4.71M |
|
1272
CALL
Bunge Global
BG
$23.6B
| $4.51M | ﹤0.01% |
57,700
+56,869
| +6,843% | +$4.8M |
|
|
AXON
1273
CALL
Axon Enterprise
AXON
$40.5B
| $4.51M | ﹤0.01% |
25,500
+25,302
| +12,779% | +$3.73M |
|
|
TPGY
1274
PUT
DELISTED
TPG Pace Beneficial Finance Corp.
TPGY
| $4.5M | ﹤0.01% |
349,300
+348,388
| +38,200% | +$5.05M |
|
|
AAWW
1275
PUT
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $4.5M | ﹤0.01% |
+66,000
| New | +$4.63M |
|
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.