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 | |
|---|---|---|---|---|---|---|
1976
CALL
Live Oak Bancshares
LOB
$1.95B
| $2.32M | ﹤0.01% |
39,300
+39,224
| +51,611% | +$2.46M |
|
1977
Public Storage
PSA
$60.2B
| $2.32M | ﹤0.01% |
7,707
+808
| +12% | +$227K |
|
|
TIGR
1978
CALL
UP Fintech Holding
TIGR
$845M
| $2.31M | ﹤0.01% |
79,800
+79,206
| +13,334% | +$1.69M |
|
1979
Arrowhead Research
ARWR
$12.1B
| $2.31M | ﹤0.01% |
27,896
-2,954
| -10% | -$220K |
|
1980
Direxion Daily Gold Miners Index Bull 2X ETF
NUGT
$863M
| $2.31M | ﹤0.01% |
39,717
+7,913
| +25% | +$539K |
|
1981
Pool Corp
POOL
$6.7B
| $2.31M | ﹤0.01% |
+5,028
| New | +$2.12M |
|
1982
PUT
Boston Properties
BXP
$11B
| $2.3M | ﹤0.01% |
20,100
+19,117
| +1,945% | +$2.15M |
|
1983
PUT
Danaos Corp
DAC
$2.55B
| $2.3M | ﹤0.01% |
30,000
+29,698
| +9,834% | +$1.84M |
|
1984
Uber
UBER
$134B
| $2.3M | ﹤0.01% |
+45,951
| New | +$2.4M |
|
1985
JetBlue
JBLU
$1.96B
| $2.3M | ﹤0.01% |
137,229
+28,084
| +26% | +$544K |
|
|
GRA
1986
PUT
DELISTED
W.R. Grace & Co.
GRA
| $2.3M | ﹤0.01% |
33,300
+33,287
| +256,054% | +$2.24M |
|
|
BNY
1987
PUT
Bank of New York Mellon
BNY
$108B
| $2.3M | ﹤0.01% |
+44,900
| New | +$2.25M |
|
1988
PUT
BioCryst Pharmaceuticals
BCRX
$2.37B
| $2.3M | ﹤0.01% |
+145,400
| New | +$1.98M |
|
|
SGI
1989
PUT
Somnigroup International
SGI
$15.1B
| $2.3M | ﹤0.01% |
58,600
+58,399
| +29,054% | +$2.24M |
|
|
MRO
1990
DELISTED
Marathon Oil Corporation
MRO
| $2.3M | ﹤0.01% |
168,616
-115,225
| -41% | -$1.39M |
|
1991
PUT
NCR Voyix
VYX
$1.06B
| $2.29M | ﹤0.01% |
81,989
+79,779
| +3,610% | +$2.21M |
|
1992
CALL
Charles River Laboratories
CRL
$10.9B
| $2.29M | ﹤0.01% |
6,200
+6,146
| +11,381% | +$2.05M |
|
|
FRMM
1993
CALL
Forum Markets
FRMM
$75.7M
| $2.29M | ﹤0.01% |
+60
| New | +$2.11M |
|
1994
PUT
Playtika
PLTK
$1.4B
| $2.29M | ﹤0.01% |
96,000
+95,292
| +13,459% | +$2.49M |
|
1995
PUT
MillerKnoll
MLKN
$1.5B
| $2.29M | ﹤0.01% |
48,500
+48,296
| +23,675% | +$2.19M |
|
1996
PUT
Welltower
WELL
$178B
| $2.29M | ﹤0.01% |
27,500
+27,264
| +11,553% | +$2.09M |
|
1997
PUT
Tower Semiconductor
TSEM
$26.4B
| $2.28M | ﹤0.01% |
77,500
+76,826
| +11,399% | +$2.16M |
|
|
PR
1998
PUT
Permian Resources
PR
$17.9B
| $2.28M | ﹤0.01% |
335,800
+333,774
| +16,475% | +$1.72M |
|
|
CS
1999
CALL
DELISTED
Credit Suisse Group
CS
| $2.27M | ﹤0.01% |
+216,500
| New | +$2.3M |
|
|
SGI
2000
CALL
Somnigroup International
SGI
$15.1B
| $2.27M | ﹤0.01% |
57,900
+57,352
| +10,466% | +$2.2M |
|
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.