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 | |
|---|---|---|---|---|---|---|
976
Walmart Inc
WMT
$863B
| $6.48M | 0.01% |
137,844
-91,152
| -40% | -$4.25M |
|
977
CALL
Keysight
KEYS
$55.6B
| $6.45M | 0.01% |
41,800
+41,416
| +10,785% | +$6.01M |
|
|
WW
978
CALL
DELISTED
WW International
WW
| $6.45M | 0.01% |
+178,600
| New | +$6.12M |
|
979
CALL
Boston Beer
SAM
$1.82B
| $6.43M | 0.01% |
6,300
+6,289
| +57,173% | +$7.06M |
|
|
HOLX
980
CALL
DELISTED
Hologic
HOLX
| $6.41M | 0.01% |
96,000
+95,831
| +56,705% | +$6.41M |
|
|
DISH
981
PUT
DELISTED
DISH Network Corp.
DISH
| $6.39M | 0.01% |
153,000
+150,293
| +5,552% | +$6.32M |
|
982
PUT
Cameco
CCJ
$38.9B
| $6.39M | 0.01% |
+333,200
| New | +$6.29M |
|
|
LSI
983
PUT
DELISTED
Life Storage, Inc.
LSI
| $6.39M | 0.01% |
59,500
+58,281
| +4,781% | +$5.73M |
|
984
United States Oil Fund
USO
$2.5B
| $6.38M | 0.01% |
127,843
-105,260
| -45% | -$4.75M |
|
985
Qualcomm
QCOM
$180B
| $6.37M | 0.01% |
44,546
-69,713
| -61% | -$9.42M |
|
986
CALL
Honda
HMC
$36.3B
| $6.37M | 0.01% |
197,800
+197,212
| +33,539% | +$6.13M |
|
987
Caesars Entertainment
CZR
$6.09B
| $6.35M | 0.01% |
61,248
+59,302
| +3,047% | +$5.98M |
|
988
PUT
Live Nation Entertainment
LYV
$41B
| $6.34M | 0.01% |
+72,400
| New | +$6.21M |
|
|
ZEN
989
PUT
DELISTED
ZENDESK INC
ZEN
| $6.34M | 0.01% |
43,900
+43,403
| +8,733% | +$6.13M |
|
|
990
PUT
Boston Beer
SAM
$1.82B
| $6.33M | 0.01% |
6,200
+6,185
| +41,233% | +$6.94M |
|
991
PUT
GFL Environmental
GFL
$14.1B
| $6.33M | 0.01% |
198,200
+197,079
| +17,581% | +$6.45M |
|
992
Newmont
NEM
$101B
| $6.31M | 0.01% |
99,630
+49,880
| +100% | +$3.34M |
|
993
CALL
Becton Dickinson
BDX
$42.1B
| $6.3M | 0.01% |
26,548
+26,253
| +8,899% | +$6.29M |
|
994
CALL
Oshkosh
OSK
$9.48B
| $6.29M | 0.01% |
50,500
+50,118
| +13,120% | +$6.34M |
|
995
CALL
ChargePoint
CHPT
$140M
| $6.29M | 0.01% |
9,055
+8,924
| +6,812% | +$4.73M |
|
|
SPR
996
CALL
DELISTED
Spirit AeroSystems
SPR
| $6.29M | 0.01% |
133,300
+132,257
| +12,680% | +$6.26M |
|
997
Blackstone
BX
$99.6B
| $6.29M | 0.01% |
+64,714
| New | +$5.75M |
|
998
PUT
DXC Technology
DXC
$1.5B
| $6.28M | 0.01% |
161,400
+159,260
| +7,442% | +$5.68M |
|
999
PUT
Automatic Data Processing
ADP
$97.1B
| $6.28M | 0.01% |
31,600
+31,352
| +12,642% | +$6.09M |
|
1000
PUT
Check Point Software Technologies
CHKP
$12.9B
| $6.27M | 0.01% |
54,000
+53,491
| +10,509% | +$6.31M |
|
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.