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 | |
|---|---|---|---|---|---|---|
776
PUT
Shake Shack
SHAK
$2.26B
| $8.89M | 0.01% |
83,100
+82,685
| +19,924% | +$8.34M |
|
777
American Tower
AMT
$76.7B
| $8.89M | 0.01% |
32,915
+8,136
| +33% | +$2.07M |
|
|
JWN
778
PUT
DELISTED
Nordstrom
JWN
| $8.88M | 0.01% |
242,900
+241,074
| +13,202% | +$8.8M |
|
779
PUT
KB Home
KBH
$3.41B
| $8.83M | 0.01% |
216,800
+216,325
| +45,542% | +$9.98M |
|
780
CALL
Academy Sports + Outdoors
ASO
$2.92B
| $8.8M | 0.01% |
213,400
+212,931
| +45,401% | +$7.46M |
|
781
PUT
Phillips 66
PSX
$83B
| $8.8M | 0.01% |
102,500
+101,565
| +10,863% | +$8.57M |
|
782
Marriott International
MAR
$96.1B
| $8.79M | 0.01% |
64,382
+38,784
| +152% | +$5.59M |
|
|
LAZR
783
CALL
DELISTED
Luminar Technologies
LAZR
| $8.78M | 0.01% |
26,673
+26,518
| +17,108% | +$8.75M |
|
784
State Street SPDR S&P 500 ETF Trust
SPY
$777B
| $8.76M | 0.01% |
20,467
+5,749
| +39% | +$2.4M |
|
785
CALL
Fidelity National Information Services
FIS
$20.7B
| $8.74M | 0.01% |
61,700
+60,647
| +5,759% | +$9.01M |
|
786
CALL
Magna International
MGA
$17.9B
| $8.72M | 0.01% |
94,100
+93,416
| +13,657% | +$8.9M |
|
787
Cleveland-Cliffs
CLF
$6.25B
| $8.71M | 0.01% |
+403,897
| New | +$7.96M |
|
788
CALL
Dave & Buster's
PLAY
$339M
| $8.7M | 0.01% |
214,400
+212,663
| +12,243% | +$9.21M |
|
789
CALL
BioNTech
BNTX
$23.3B
| $8.69M | 0.01% |
38,800
+38,540
| +14,823% | +$7.27M |
|
790
PUT
CSX Corp
CSX
$98.1B
| $8.67M | 0.01% |
+270,200
| New | +$8.91M |
|
791
CALL
Wendy's
WEN
$1.37B
| $8.66M | 0.01% |
369,900
+369,706
| +190,570% | +$8.49M |
|
792
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $8.65M | 0.01% |
464,900
+461,673
| +14,307% | +$9.3M |
|
793
PUT
PagSeguro Digital
PAGS
$2.64B
| $8.65M | 0.01% |
154,700
+153,644
| +14,550% | +$7.39M |
|
794
BP
BP
$113B
| $8.63M | 0.01% |
326,715
+139,420
| +74% | +$3.66M |
|
795
CALL
Tencent Music
TME
$14.3B
| $8.62M | 0.01% |
556,800
+549,313
| +7,337% | +$9.09M |
|
796
CALL
PACCAR
PCAR
$68.8B
| $8.6M | 0.01% |
144,600
+142,917
| +8,492% | +$8.76M |
|
797
PUT
Dropbox
DBX
$6.63B
| $8.58M | 0.01% |
283,200
+279,626
| +7,824% | +$7.64M |
|
798
PUT
Nokia
NOK
$54.3B
| $8.54M | 0.01% |
1,604,500
+1,587,493
| +9,334% | +$7.66M |
|
799
CALL
Microvision
MVIS
$96.4M
| $8.51M | 0.01% |
+508,200
| New | +$8.34M |
|
|
PPLC
800
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $8.46M | 0.01% |
110,100
+109,102
| +10,932% | +$8.38M |
|
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.