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 | |
|---|---|---|---|---|---|---|
1701
PUT
Emerson Electric
EMR
$82.9B
| $2.92M | ﹤0.01% |
30,400
+29,948
| +6,626% | +$2.82M |
|
|
NVO
1702
Novo Nordisk
NVO
$216B
| $2.92M | ﹤0.01% |
69,834
+41,690
| +148% | +$1.62M |
|
1703
CALL
BioMarin Pharmaceuticals
BMRN
$11.5B
| $2.92M | ﹤0.01% |
35,000
+34,248
| +4,554% | +$2.71M |
|
1704
CALL
Inovio Pharmaceuticals
INO
$79.8M
| $2.92M | ﹤0.01% |
+26,233
| New | +$2.52M |
|
1705
CALL
Western Union
WU
$2.57B
| $2.91M | ﹤0.01% |
126,900
+125,814
| +11,585% | +$3.13M |
|
1706
PUT
CONMED
CNMD
$1.29B
| $2.91M | ﹤0.01% |
21,200
+20,986
| +9,807% | +$2.87M |
|
|
BFX
1707
PUT
DELISTED
BowFlex Inc.
BFX
| $2.91M | ﹤0.01% |
172,600
+170,190
| +7,062% | +$2.87M |
|
1708
PUT
Green Dot
GDOT
$753M
| $2.9M | ﹤0.01% |
62,000
+61,651
| +17,665% | +$2.75M |
|
1709
CALL
Lucid Motors
LCID
$2.46B
| $2.9M | ﹤0.01% |
110,900
+109,587
| +8,346% | +$24M |
|
1710
CALL
Jefferies Financial Group
JEF
$12.9B
| $2.9M | ﹤0.01% |
88,701
+88,361
| +25,989% | +$2.7M |
|
1711
CALL
Trip.com Group
TCOM
$27.5B
| $2.9M | ﹤0.01% |
81,800
+80,303
| +5,364% | +$3.06M |
|
1712
CALL
Whirlpool
WHR
$2.42B
| $2.9M | ﹤0.01% |
13,300
+13,276
| +55,317% | +$3.09M |
|
1713
CALL
Zimmer Biomet
ZBH
$17.7B
| $2.89M | ﹤0.01% |
+18,540
| New | +$3M |
|
|
MDP
1714
PUT
DELISTED
Meredith Corporation
MDP
| $2.89M | ﹤0.01% |
+66,600
| New | +$2.36M |
|
1715
CALL
VeriSign
VRSN
$25.3B
| $2.89M | ﹤0.01% |
12,700
+12,609
| +13,856% | +$2.75M |
|
1716
CALL
PennyMac Financial
PFSI
$4.38B
| $2.89M | ﹤0.01% |
46,800
+46,358
| +10,488% | +$2.82M |
|
1717
CALL
Equity Residential
EQR
$25.4B
| $2.89M | ﹤0.01% |
37,500
+37,130
| +10,035% | +$2.81M |
|
|
SOS
1718
CALL
SOS Limited
SOS
$18.2M
| $2.89M | ﹤0.01% |
1,163
+1,148
| +7,653% | +$3.37M |
|
|
NEWR
1719
CALL
DELISTED
New Relic, Inc.
NEWR
| $2.89M | ﹤0.01% |
43,100
+43,025
| +57,367% | +$2.77M |
|
1720
PUT
Toll Brothers
TOL
$14B
| $2.88M | ﹤0.01% |
49,900
+49,492
| +12,130% | +$3.02M |
|
1721
CALL
ACI Worldwide
ACIW
$5.72B
| $2.88M | ﹤0.01% |
77,600
+76,851
| +10,260% | +$3.01M |
|
|
NNDM
1722
Nano Dimension
NNDM
$309M
| $2.88M | ﹤0.01% |
349,440
-57,672
| -14% | -$427K |
|
1723
CALL
FIGS
FIGS
$1.59B
| $2.88M | ﹤0.01% |
+57,400
| New | +$2.15M |
|
1724
CALL
Tower Semiconductor
TSEM
$26.4B
| $2.87M | ﹤0.01% |
97,600
+96,816
| +12,349% | +$2.72M |
|
|
MUDS
1725
CALL
DELISTED
Mudrick Capital Acquisition Corporation II Class A Common Stock
MUDS
| $2.87M | ﹤0.01% |
+230,200
| New | +$3M |
|
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.