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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
101
PUT
Uber
UBER
$146B
| $130M | 0.12% |
2,575,000
+40,700
| +2% | +$1.78M |
|
102
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $129M | 0.12% |
1,299,700
+132,800
| +11% | +$4.07M |
|
|
TWTR
103
PUT
DELISTED
Twitter, Inc.
TWTR
| $129M | 0.12% |
1,890,400
+80,000
| +4% | +$5.25M |
|
104
CALL
Coinbase
COIN
$46.3B
| $128M | 0.12% |
531,100
+39,400
| +8% | +$9.7M |
|
105
PUT
TSMC
TSM
$2.2T
| $127M | 0.12% |
1,075,000
+11,500
| +1% | +$1.35M |
|
106
CALL
Wells Fargo
WFC
$261B
| $126M | 0.12% |
2,774,300
+48,300
| +2% | +$2.24M |
|
107
CALL
Target
TGT
$63.4B
| $126M | 0.12% |
517,400
+50,900
| +11% | +$12.8M |
|
108
PUT
Booking.com
BKNG
$139B
| $124M | 0.12% |
1,407,500
+112,500
| +9% | +$10.1M |
|
109
PUT
Beyond Meat
BYND
$314M
| $124M | 0.12% |
809,800
+6,800
| +0.8% | +$832K |
|
110
CALL
Pfizer
PFE
$142B
| $123M | 0.12% |
3,224,100
-14,100
| -0.4% | -$625K |
|
|
111
PUT
Pfizer
PFE
$142B
| $123M | 0.11% |
3,624,100
+32,500
| +0.9% | +$1.44M |
|
112
PUT
DraftKings
DKNG
$11.8B
| $123M | 0.11% |
2,375,000
+167,100
| +8% | +$8.86M |
|
113
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $123M | 0.11% |
3,068,900
-20,900
| -0.7% | -$540K |
|
114
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $121M | 0.11% |
433,500
-1,800
| -0.4% | -$506K |
|
115
PUT
Starbucks
SBUX
$119B
| $121M | 0.11% |
1,066,400
-5,000
| -0.5% | -$585K |
|
116
PUT
Applied Materials
AMAT
$448B
| $120M | 0.11% |
872,800
+28,700
| +3% | +$3.9M |
|
117
PUT
Intuitive Surgical
ISRG
$124B
| $120M | 0.11% |
387,000
+300
| +0.1% | +$101K |
|
118
PUT
Pinterest
PINS
$12.8B
| $118M | 0.11% |
1,483,400
+129,600
| +10% | +$7.96M |
|
119
CALL
Goldman Sachs
GS
$320B
| $118M | 0.11% |
315,800
+2,100
| +0.7% | +$820K |
|
120
PUT
General Motors
GM
$71.7B
| $116M | 0.11% |
1,968,700
-44,700
| -2% | -$2.38M |
|
121
CALL
Bank of America
BAC
$430B
| $116M | 0.11% |
2,793,900
-28,000
| -1% | -$1.13M |
|
122
CALL
Peloton Interactive
PTON
$2.82B
| $115M | 0.11% |
944,600
+54,900
| +6% | +$6.07M |
|
123
CALL
ARK Space & Defense Innovation ETF
ARKX
$823M
| $115M | 0.11% |
1,104,000
+48,400
| +5% | +$991K |
|
|
124
PUT
Wells Fargo
WFC
$261B
| $114M | 0.11% |
2,514,700
+24,000
| +1% | +$1.11M |
|
|
125
PUT
Peloton Interactive
PTON
$2.82B
| $114M | 0.11% |
932,000
+60,400
| +7% | +$6.68M |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.