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 | |
|---|---|---|---|---|---|---|
101
PUT
Beyond Meat
BYND
$314M
| $126M | 0.12% |
803,000
+796,774
| +12,798% | +$106M |
|
102
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $126M | 0.12% |
3,089,800
+3,052,433
| +8,169% | +$80.4M |
|
103
PUT
Airbnb
ABNB
$86B
| $126M | 0.12% |
822,400
+819,108
| +24,882% | +$129M |
|
|
TWTR
104
PUT
DELISTED
Twitter, Inc.
TWTR
| $125M | 0.12% |
+1,810,400
| New | +$111M |
|
105
CALL
Coinbase
COIN
$46.3B
| $125M | 0.12% |
+491,700
| New | +$128M |
|
|
106
CALL
Wells Fargo
WFC
$266B
| $123M | 0.12% |
+2,726,000
| New | +$122M |
|
107
CALL
Pfizer
PFE
$142B
| $123M | 0.12% |
3,238,200
+3,216,660
| +14,933% | +$125M |
|
108
PUT
Target
TGT
$63.4B
| $121M | 0.12% |
+502,300
| New | +$110M |
|
109
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $121M | 0.12% |
+435,300
| New | +$122M |
|
|
110
PUT
Pfizer
PFE
$142B
| $121M | 0.12% |
3,591,600
+3,559,666
| +11,147% | +$138M |
|
111
PUT
Applied Materials
AMAT
$448B
| $120M | 0.12% |
844,100
+832,957
| +7,475% | +$112M |
|
112
PUT
Starbucks
SBUX
$119B
| $120M | 0.12% |
1,071,400
+1,061,408
| +10,623% | +$120M |
|
113
PUT
General Motors
GM
$71.7B
| $119M | 0.12% |
2,013,400
+1,998,402
| +13,324% | +$117M |
|
114
CALL
Goldman Sachs
GS
$320B
| $119M | 0.12% |
313,700
+310,525
| +9,780% | +$111M |
|
115
PUT
Intuitive Surgical
ISRG
$124B
| $119M | 0.11% |
386,700
+386,193
| +76,172% | +$108M |
|
116
CALL
Bank of America
BAC
$430B
| $116M | 0.11% |
2,821,900
+2,804,025
| +15,687% | +$115M |
|
117
PUT
DraftKings
DKNG
$11.8B
| $115M | 0.11% |
2,207,900
+2,199,926
| +27,589% | +$116M |
|
118
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $113M | 0.11% |
1,166,900
+1,155,597
| +10,224% | +$35.4M |
|
119
PUT
Booking.com
BKNG
$139B
| $113M | 0.11% |
+1,295,000
| New | +$121M |
|
|
120
PUT
Wells Fargo
WFC
$266B
| $113M | 0.11% |
+2,490,700
| New | +$111M |
|
|
121
CALL
Target
TGT
$63.4B
| $113M | 0.11% |
+466,500
| New | +$102M |
|
122
CALL
ARK Space & Defense Innovation ETF
ARKX
$823M
| $111M | 0.11% |
+1,055,600
| New | +$21.7M |
|
123
PUT
IBM
IBM
$198B
| $111M | 0.11% |
+789,625
| New | +$108M |
|
124
CALL
Peloton Interactive
PTON
$2.75B
| $110M | 0.11% |
889,700
+884,625
| +17,431% | +$94.2M |
|
125
PUT
JD.com
JD
$41.1B
| $110M | 0.11% |
1,379,900
+1,367,548
| +11,071% | +$103M |
|
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.