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 | |
|---|---|---|---|---|---|---|
|
26
PUT
Alibaba
BABA
$283B
| $645M | 0.6% |
2,905,500
+30,800
| +1% | +$5.6M |
|
27
CALL
Alphabet (Google) Class A
GOOGL
$4.24T
| $611M | 0.57% |
4,910,000
+278,000
| +6% | +$37.8M |
|
28
CALL
Microsoft
MSFT
$2.95T
| $571M | 0.53% |
2,102,600
-2,700
| -0.1% | -$786K |
|
29
PUT
Netflix
NFLX
$286B
| $510M | 0.48% |
9,553,000
+45,000
| +0.5% | +$2.48M |
|
|
30
CALL
Netflix
NFLX
$286B
| $449M | 0.42% |
8,417,000
+19,000
| +0.2% | +$1.05M |
|
|
31
PUT
Advanced Micro Devices
AMD
$888B
| $420M | 0.39% |
4,505,500
+418,500
| +10% | +$42.8M |
|
32
CALL
Boeing
BA
$161B
| $415M | 0.39% |
1,729,800
-24,300
| -1% | -$5.42M |
|
|
33
CALL
Advanced Micro Devices
AMD
$888B
| $388M | 0.36% |
4,330,900
-137,200
| -3% | -$14M |
|
34
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $329M | 0.31% |
948,700
+27,700
| +3% | +$9.68M |
|
35
CALL
Salesforce
CRM
$139B
| $324M | 0.3% |
1,321,800
-8,000
| -0.6% | -$2.03M |
|
36
CALL
iShares Silver Trust
SLV
$28.4B
| $317M | 0.3% |
13,145,700
+25,800
| +0.2% | +$580K |
|
|
37
PUT
Salesforce
CRM
$139B
| $314M | 0.29% |
1,281,600
+170,900
| +15% | +$43.4M |
|
|
XYZ
38
PUT
Block Inc
XYZ
$47.8B
| $305M | 0.28% |
1,259,200
+10,400
| +0.8% | +$2.67M |
|
|
39
PUT
Boeing
BA
$161B
| $304M | 0.28% |
1,269,000
+65,400
| +5% | +$14.6M |
|
40
CALL
Baidu
BIDU
$36.8B
| $265M | 0.25% |
1,317,500
+47,400
| +4% | +$7.79M |
|
41
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $263M | 0.25% |
5,014,600
+200,400
| +4% | +$6.53M |
|
|
42
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $262M | 0.24% |
755,000
+23,600
| +3% | +$8.24M |
|
|
43
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $259M | 0.24% |
3,800,500
+42,400
| +1% | +$1.38M |
|
44
PUT
Walt Disney
DIS
$167B
| $259M | 0.24% |
1,458,800
+21,000
| +1% | +$3.74M |
|
45
CALL
AMC Entertainment Holdings
AMC
$1.96B
| $249M | 0.23% |
459,990
+19,560
| +4% | +$7.89M |
|
|
46
CALL
Micron Technology
MU
$1.1T
| $249M | 0.23% |
3,102,000
+277,400
| +10% | +$20.8M |
|
47
PUT
NIO
NIO
$12B
| $245M | 0.23% |
4,814,800
+261,800
| +6% | +$10.8M |
|
|
48
PUT
Baidu
BIDU
$36.8B
| $244M | 0.23% |
1,209,400
+14,900
| +1% | +$2.45M |
|
|
XYZ
49
CALL
Block Inc
XYZ
$47.8B
| $242M | 0.23% |
1,002,200
+22,400
| +2% | +$5.75M |
|
|
50
CALL
Walt Disney
DIS
$167B
| $239M | 0.22% |
1,348,400
-1,700
| -0.1% | -$303K |
|
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.