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 | Miscellaneous | 97.7% |
| 2 | Technology | 0.48% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.28% |
| 5 | Healthcare | 0.27% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
26
CALL
SPDR Gold Trust
GLD
$150B
| $616M | 0.6% |
3,720,000
+3,682,128
| +9,723% | +$626M |
|
27
CALL
Alphabet (Google) Class A
GOOGL
$4.14T
| $574M | 0.55% |
4,632,000
+4,588,640
| +10,583% | +$536M |
|
28
CALL
Microsoft
MSFT
$3.71T
| $570M | 0.55% |
2,105,300
+2,077,296
| +7,418% | +$528M |
|
29
PUT
Netflix
NFLX
$326B
| $502M | 0.49% |
9,508,000
+9,435,330
| +12,984% | +$482M |
|
|
30
CALL
Netflix
NFLX
$326B
| $444M | 0.43% |
8,398,000
+8,352,180
| +18,228% | +$427M |
|
31
CALL
Boeing
BA
$168B
| $420M | 0.41% |
1,754,100
+1,738,537
| +11,171% | +$420M |
|
32
CALL
Advanced Micro Devices
AMD
$780B
| $404M | 0.39% |
4,468,100
+4,434,773
| +13,307% | +$358M |
|
|
33
PUT
Advanced Micro Devices
AMD
$780B
| $384M | 0.37% |
4,087,000
+4,044,446
| +9,504% | +$327M |
|
34
CALL
Salesforce
CRM
$213B
| $325M | 0.31% |
1,329,800
+1,317,246
| +10,493% | +$304M |
|
35
CALL
iShares Silver Trust
SLV
$32.2B
| $318M | 0.31% |
+13,119,900
| New | +$325M |
|
|
36
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.9B
| $318M | 0.31% |
921,000
+913,115
| +11,580% | +$312M |
|
|
XYZ
37
PUT
Block Inc
XYZ
$49.7B
| $304M | 0.29% |
1,248,800
+1,238,325
| +11,822% | +$287M |
|
|
38
PUT
Boeing
BA
$168B
| $288M | 0.28% |
1,203,600
+1,192,697
| +10,939% | +$288M |
|
|
39
PUT
Salesforce
CRM
$213B
| $271M | 0.26% |
1,110,700
+1,103,553
| +15,441% | +$254M |
|
40
PUT
VanEck Gold Miners ETF
GDX
$30.2B
| $259M | 0.25% |
3,758,100
+3,728,477
| +12,586% | +$136M |
|
|
41
CALL
Baidu
BIDU
$33.7B
| $259M | 0.25% |
1,270,100
+1,258,099
| +10,483% | +$252M |
|
|
42
CALL
VanEck Gold Miners ETF
GDX
$30.2B
| $254M | 0.25% |
4,814,200
+4,780,118
| +14,025% | +$175M |
|
43
PUT
Walt Disney
DIS
$182B
| $253M | 0.24% |
+1,437,800
| New | +$259M |
|
|
44
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.9B
| $252M | 0.24% |
731,400
+721,187
| +7,061% | +$246M |
|
|
45
CALL
AMC Entertainment Holdings
AMC
$2.37B
| $250M | 0.24% |
+440,430
| New | +$117M |
|
|
46
PUT
Baidu
BIDU
$33.7B
| $244M | 0.24% |
1,194,500
+1,183,682
| +10,942% | +$237M |
|
47
PUT
NIO
NIO
$9.52B
| $242M | 0.23% |
4,553,000
+4,491,314
| +7,281% | +$180M |
|
|
48
CALL
Micron Technology
MU
$1.15T
| $240M | 0.23% |
2,824,600
+2,805,389
| +14,603% | +$237M |
|
|
XYZ
49
CALL
Block Inc
XYZ
$49.7B
| $239M | 0.23% |
979,800
+969,181
| +9,127% | +$225M |
|
|
50
CALL
Walt Disney
DIS
$182B
| $237M | 0.23% |
+1,350,100
| New | +$243M |
|
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's Q2 2021 filing shows 2,248 new, 6,668 increased, 1,000 reduced and 1,196 closed positions. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M. The largest sale was Invesco QQQ Trust, an estimated $36.1M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 97% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,248 new positions and closed 1,196 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.