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 | |
|---|---|---|---|---|---|---|
2451
CALL
ICICI Bank
IBN
$106B
| $1.63M | ﹤0.01% |
+95,400
| New | +$1.59M |
|
2452
PUT
Manulife Financial
MFC
$72.6B
| $1.63M | ﹤0.01% |
82,800
+80,694
| +3,832% | +$1.69M |
|
2453
CALL
Spruce Power Holding Corp
SPRU
$39.9M
| $1.63M | ﹤0.01% |
24,463
+24,344
| +20,457% | +$1.43M |
|
|
LOTZ
2454
CALL
DELISTED
CarLotz, Inc. Class A Common Stock
LOTZ
| $1.63M | ﹤0.01% |
+298,700
| New | +$1.88M |
|
2455
The Greenbrier Companies
GBX
$1.61B
| $1.63M | ﹤0.01% |
+37,396
| New | +$1.73M |
|
2456
CALL
PROG Holdings
PRG
$1.75B
| $1.63M | ﹤0.01% |
34,100
+33,882
| +15,542% | +$1.69M |
|
|
KNDI
2457
CALL
Kandi Technologies Group
KNDI
$65.3M
| $1.63M | ﹤0.01% |
+272,400
| New | +$1.56M |
|
2458
BARK
BARK
$74.8M
| $1.62M | ﹤0.01% |
7,320
+4,924
| +206% | +$1.06M |
|
|
EVRI
2459
DELISTED
Everi Holdings
EVRI
| $1.62M | ﹤0.01% |
+65,052
| New | +$1.23M |
|
2460
CALL
Murphy Oil
MUR
$5.58B
| $1.62M | ﹤0.01% |
+69,700
| New | +$1.42M |
|
|
GSKY
2461
PUT
DELISTED
GreenSky, Inc. Class A Common Stock
GSKY
| $1.62M | ﹤0.01% |
292,000
+291,576
| +68,768% | +$1.75M |
|
2462
PUT
Molina Healthcare
MOH
$10.3B
| $1.62M | ﹤0.01% |
6,400
+6,225
| +3,557% | +$1.56M |
|
2463
PUT
Boyd Gaming
BYD
$6.47B
| $1.62M | ﹤0.01% |
+26,300
| New | +$1.66M |
|
2464
CALL
Nasdaq
NDAQ
$51.5B
| $1.62M | ﹤0.01% |
+27,600
| New | +$1.52M |
|
2465
CALL
Green Dot
GDOT
$753M
| $1.62M | ﹤0.01% |
34,500
+34,454
| +74,900% | +$1.54M |
|
2466
CALL
Kulicke & Soffa
KLIC
$5.3B
| $1.61M | ﹤0.01% |
26,400
+26,201
| +13,166% | +$1.41M |
|
2467
PUT
OraSure Technologies
OSUR
$273M
| $1.61M | ﹤0.01% |
+159,200
| New | +$1.55M |
|
2468
PUT
Varonis Systems
VRNS
$5.25B
| $1.61M | ﹤0.01% |
28,000
+27,761
| +11,615% | +$1.45M |
|
|
JOYY
2469
CALL
JOYY Inc
JOYY
$3.73B
| $1.61M | ﹤0.01% |
24,400
+24,065
| +7,184% | +$2.04M |
|
2470
iRhythm Holdings
IRTC
$3.59B
| $1.61M | ﹤0.01% |
24,210
+23,808
| +5,922% | +$1.89M |
|
2471
Credit Acceptance
CACC
$6B
| $1.6M | ﹤0.01% |
3,534
-5,390
| -60% | -$2.21M |
|
2472
CALL
Danaos Corp
DAC
$2.55B
| $1.6M | ﹤0.01% |
20,900
+20,662
| +8,682% | +$1.28M |
|
2473
CALL
Hecla Mining
HL
$10.2B
| $1.6M | ﹤0.01% |
215,600
+214,542
| +20,278% | +$1.61M |
|
|
VNET
2474
CALL
VNET Group
VNET
$2.05B
| $1.6M | ﹤0.01% |
69,900
+69,176
| +9,555% | +$1.76M |
|
2475
PUT
Cracker Barrel
CBRL
$1.2B
| $1.6M | ﹤0.01% |
10,800
+10,562
| +4,438% | +$1.7M |
|
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.