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 | |
|---|---|---|---|---|---|---|
626
Roblox
RBLX
$34B
| $12.3M | 0.01% |
136,642
+108,105
| +379% | +$8.68M |
|
627
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$245M
| $12.3M | 0.01% |
278,000
+274,214
| +7,243% | +$12.9M |
|
628
CALL
T-Mobile US
TMUS
$193B
| $12.3M | 0.01% |
+84,800
| New | +$11.7M |
|
|
DISCK
629
PUT
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $12.2M | 0.01% |
400,200
+395,291
| +8,052% | +$12.3M |
|
|
DFS
630
PUT
DELISTED
Discover Financial Services
DFS
| $12.2M | 0.01% |
103,200
+101,400
| +5,633% | +$11.5M |
|
631
CALL
Marathon Petroleum
MPC
$91.8B
| $12.2M | 0.01% |
201,800
+197,091
| +4,185% | +$11.6M |
|
632
CALL
Eaton
ETN
$161B
| $12.2M | 0.01% |
+82,100
| New | +$11.8M |
|
633
PUT
Humana
HUM
$47.1B
| $12.1M | 0.01% |
27,300
+27,083
| +12,481% | +$11.8M |
|
634
CALL
Bank of Montreal
BMO
$123B
| $12.1M | 0.01% |
117,800
+116,902
| +13,018% | +$11.5M |
|
|
COUP
635
PUT
DELISTED
Coupa Software Incorporated
COUP
| $12.1M | 0.01% |
46,000
+45,425
| +7,900% | +$11.3M |
|
636
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.5M
| $12M | 0.01% |
329,700
+325,372
| +7,518% | +$15.3M |
|
|
FTCH
637
PUT
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $12M | 0.01% |
238,200
+234,570
| +6,462% | +$11.1M |
|
638
CALL
Northrop Grumman
NOC
$75.5B
| $12M | 0.01% |
33,000
+32,588
| +7,910% | +$11.7M |
|
639
Applied Materials
AMAT
$450B
| $12M | 0.01% |
84,182
+8,048
| +11% | +$1.08M |
|
640
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$256M
| $12M | 0.01% |
1,239,600
+1,222,568
| +7,178% | +$24.4M |
|
641
PUT
Veeva Systems
VEEV
$29.4B
| $11.9M | 0.01% |
38,200
+37,794
| +9,309% | +$10.5M |
|
642
CALL
DexCom
DXCM
$27.2B
| $11.9M | 0.01% |
111,200
+109,704
| +7,333% | +$10.5M |
|
643
Intuit
INTU
$76.8B
| $11.9M | 0.01% |
24,197
+17,575
| +265% | +$7.62M |
|
644
PUT
CRISPR Therapeutics
CRSP
$4.68B
| $11.8M | 0.01% |
73,200
+72,905
| +24,714% | +$8.87M |
|
645
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.5M
| $11.8M | 0.01% |
489,000
+485,040
| +12,248% | +$48M |
|
646
PUT
Digital Turbine
APPS
$989M
| $11.8M | 0.01% |
+155,000
| New | +$11.1M |
|
647
CALL
Valero Energy
VLO
$91.9B
| $11.8M | 0.01% |
150,700
+148,348
| +6,307% | +$11.5M |
|
648
PUT
CarMax
KMX
$8.19B
| $11.8M | 0.01% |
+91,100
| New | +$11.3M |
|
649
CALL
SAP
SAP
$171B
| $11.8M | 0.01% |
83,700
+82,554
| +7,204% | +$11.5M |
|
650
CALL
Dow Inc
DOW
$22.3B
| $11.8M | 0.01% |
185,700
+183,789
| +9,617% | +$12.1M |
|
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.