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 | |
|---|---|---|---|---|---|---|
3701
PUT
Amphenol
APH
$176B
| $677K | ﹤0.01% |
19,800
+19,520
| +6,971% | +$659K |
|
|
CMA
3702
CALL
DELISTED
Comerica
CMA
| $677K | ﹤0.01% |
9,500
+9,358
| +6,590% | +$694K |
|
3703
CALL
Cardiff Oncology
CRDF
$62.9M
| $677K | ﹤0.01% |
101,900
+101,473
| +23,764% | +$861K |
|
3704
Ezcorp Inc
EZPW
$1.83B
| $677K | ﹤0.01% |
112,301
+101,802
| +970% | +$643K |
|
3705
CALL
Bath & Body Works
BBWI
$4.14B
| $676K | ﹤0.01% |
+83,374
| New | +$4.5M |
|
3706
PUT
National CineMedia
NCMI
$371M
| $676K | ﹤0.01% |
13,350
+13,322
| +47,579% | +$625K |
|
|
GNOG
3707
PUT
DELISTED
Golden Nugget Online Gaming, Inc. Class A Common Stock
GNOG
| $676K | ﹤0.01% |
53,000
+52,271
| +7,170% | +$709K |
|
3708
CALL
The Greenbrier Companies
GBX
$1.6B
| $675K | ﹤0.01% |
15,500
+14,459
| +1,389% | +$668K |
|
3709
CALL
Sabesp
SBS
$19.6B
| $675K | ﹤0.01% |
470,791
+465,949
| +9,623% | +$694K |
|
3710
Transmedics
TMDX
$2.6B
| $675K | ﹤0.01% |
+20,350
| New | +$564K |
|
3711
CALL
Albertsons Companies
ACI
$5.68B
| $674K | ﹤0.01% |
34,300
+33,925
| +9,047% | +$658K |
|
3712
iShares Preferred and Income Securities ETF
PFF
$13.2B
| $674K | ﹤0.01% |
+17,144
| New | +$664K |
|
|
SAFE
3713
CALL
Safehold
SAFE
$1.21B
| $673K | ﹤0.01% |
6,677
+6,608
| +9,577% | +$586K |
|
3714
CALL
J.M. Smucker
SJM
$13.3B
| $673K | ﹤0.01% |
5,200
+4,910
| +1,693% | +$652K |
|
3715
Sphere Entertainment
SPHR
$4.91B
| $673K | ﹤0.01% |
8,020
+1,929
| +32% | +$171K |
|
3716
United States Brent Oil Fund
BNO
$724M
| $672K | ﹤0.01% |
34,935
+22,700
| +186% | +$398K |
|
3717
CALL
Global X MSCI Norway ETF
NORW
$85.1M
| $672K | ﹤0.01% |
33,100
+32,757
| +9,550% | +$1M |
|
|
AXNX
3718
PUT
DELISTED
Axonics, Inc. Common Stock
AXNX
| $672K | ﹤0.01% |
10,600
+10,585
| +70,567% | +$625K |
|
|
SEM
3719
CALL
DELISTED
Select Medical
SEM
| $671K | ﹤0.01% |
29,510
+29,204
| +9,544% | +$606K |
|
|
SLCA
3720
CALL
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $671K | ﹤0.01% |
58,100
+57,668
| +13,349% | +$669K |
|
|
CIM
3721
Chimera Investment
CIM
$1.06B
| $670K | ﹤0.01% |
14,831
+12,138
| +451% | +$505K |
|
3722
CMS Energy
CMS
$23.2B
| $670K | ﹤0.01% |
11,343
+4,138
| +57% | +$257K |
|
3723
Groupon
GRPN
$1.05B
| $670K | ﹤0.01% |
+15,532
| New | +$731K |
|
3724
CALL
AMC Global Media
AMCX
$449M
| $668K | ﹤0.01% |
+10,000
| New | +$551K |
|
3725
PUT
Equity Lifestyle Properties
ELS
$12.9B
| $668K | ﹤0.01% |
9,000
+8,833
| +5,289% | +$625K |
|
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.