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 | |
|---|---|---|---|---|---|---|
2576
CALL
MarketAxess Holdings
MKTX
$4.15B
| $1.48M | ﹤0.01% |
3,200
+3,174
| +12,208% | +$1.51M |
|
2577
ExxonMobil
XOM
$651B
| $1.48M | ﹤0.01% |
23,486
-284,730
| -92% | -$17M |
|
2578
CALL
Perdoceo Education
PRDO
$1.9B
| $1.48M | ﹤0.01% |
120,700
+119,391
| +9,121% | +$1.46M |
|
2579
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $1.48M | ﹤0.01% |
13,352
-1,119
| -8% | -$126K |
|
2580
CALL
Mohawk Industries
MHK
$6.9B
| $1.48M | ﹤0.01% |
7,700
+7,668
| +23,963% | +$1.56M |
|
2581
Cigna
CI
$76.6B
| $1.48M | ﹤0.01% |
+6,232
| New | +$1.56M |
|
2582
PUT
Empire State Realty Trust
ESRT
$976M
| $1.48M | ﹤0.01% |
123,100
+122,342
| +16,140% | +$1.44M |
|
2583
Raymond James Financial
RJF
$32.5B
| $1.48M | ﹤0.01% |
+17,061
| New | +$1.49M |
|
2584
Vanguard Dividend Appreciation ETF
VIG
$111B
| $1.48M | ﹤0.01% |
+9,544
| New | +$1.46M |
|
2585
PUT
Fastenal
FAST
$54B
| $1.48M | ﹤0.01% |
56,800
+56,468
| +17,008% | +$1.47M |
|
2586
CALL
Qfin Holdings
QFIN
$1.61B
| $1.48M | ﹤0.01% |
35,300
+34,349
| +3,612% | +$1.05M |
|
2587
CALL
Energizer
ENR
$1.44B
| $1.47M | ﹤0.01% |
34,300
+34,255
| +76,122% | +$1.61M |
|
|
UXIN
2588
CALL
Uxin Ltd
UXIN
$330M
| $1.47M | ﹤0.01% |
3,831
+3,828
| +127,600% | +$1.15M |
|
2589
PUT
Plains All American Pipeline
PAA
$17.4B
| $1.47M | ﹤0.01% |
129,700
+128,129
| +8,156% | +$1.32M |
|
2590
PUT
West Pharmaceutical
WST
$23.1B
| $1.47M | ﹤0.01% |
4,100
+4,099
| +409,900% | +$1.35M |
|
|
GOCO
2591
CALL
DELISTED
GoHealth
GOCO
| $1.47M | ﹤0.01% |
8,747
+8,718
| +30,062% | +$1.53M |
|
2592
Genius Sports
GENI
$1.73B
| $1.47M | ﹤0.01% |
+78,225
| New | +$1.55M |
|
2593
PUT
NNN REIT
NNN
$9.39B
| $1.47M | ﹤0.01% |
31,300
+31,174
| +24,741% | +$1.46M |
|
2594
PUT
B&G Foods
BGS
$285M
| $1.47M | ﹤0.01% |
44,700
+44,147
| +7,983% | +$1.36M |
|
2595
CALL
Alarm.com
ALRM
$2.56B
| $1.47M | ﹤0.01% |
17,300
+17,132
| +10,198% | +$1.46M |
|
2596
PUT
Vistra
VST
$55.1B
| $1.46M | ﹤0.01% |
78,900
+78,097
| +9,726% | +$1.35M |
|
|
TWNK
2597
CALL
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $1.46M | ﹤0.01% |
90,400
+89,439
| +9,307% | +$1.39M |
|
2598
CALL
Curis
CRIS
$9.53M
| $1.46M | ﹤0.01% |
453
+449
| +11,225% | +$2.03M |
|
2599
Sarepta Therapeutics
SRPT
$1.66B
| $1.46M | ﹤0.01% |
18,801
-14,554
| -44% | -$1.1M |
|
2600
PUT
Tenet Healthcare
THC
$20.1B
| $1.46M | ﹤0.01% |
+21,800
| New | +$1.35M |
|
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.