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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
26
CALL
Goldman Sachs
GS
$320B
| $159M | 0.62% |
7,204
+2,767
| +62% | +$660K |
|
|
27
PUT
Micron Technology
MU
$1.1T
| $148M | 0.58% |
28,154
+9,744
| +53% | +$527K |
|
|
28
CALL
NVIDIA
NVDA
$5.02T
| $141M | 0.55% |
238,080
+22,800
| +11% | +$139K |
|
|
29
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $138M | 0.54% |
5,672
-317
| -5% | -$77.8K |
|
30
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $121M | 0.47% |
37,160
-6,930
| -16% | -$203K |
|
|
31
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $102M | 0.4% |
4,184
-2,311
| -36% | -$567K |
|
32
CALL
Booking.com
BKNG
$139B
| $101M | 0.4% |
12,425
-28,150
| -69% | -$2.37M |
|
33
CALL
Microsoft
MSFT
$2.95T
| $97.2M | 0.38% |
9,853
+589
| +6% | +$57.1K |
|
34
CALL
Citigroup
C
$223B
| $96.6M | 0.38% |
14,430
+3,187
| +28% | +$219K |
|
35
CALL
Baidu
BIDU
$36.8B
| $92M | 0.36% |
3,787
+1,572
| +71% | +$391K |
|
|
36
CALL
Micron Technology
MU
$1.1T
| $89.6M | 0.35% |
17,093
-3,299
| -16% | -$178K |
|
37
PUT
NXP Semiconductors
NXPI
$69B
| $85.3M | 0.33% |
7,804
+7,047
| +931% | +$777K |
|
38
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $84.3M | 0.33% |
14,369
+1,061
| +8% | +$97.8K |
|
39
PUT
Salesforce
CRM
$139B
| $76.2M | 0.3% |
5,589
-2,018
| -27% | -$257K |
|
40
PUT
Intuitive Surgical
ISRG
$124B
| $76.2M | 0.3% |
4,779
-579
| -11% | -$88.3K |
|
|
41
PUT
Baidu
BIDU
$36.8B
| $76.2M | 0.3% |
3,135
-221
| -7% | -$55K |
|
42
CALL
SPDR Gold Trust
GLD
$132B
| $76M | 0.3% |
6,407
-998
| -13% | -$124K |
|
|
43
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $75.6M | 0.3% |
4,050
+33
| +0.8% | +$6.43K |
|
44
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $75M | 0.29% |
18,259
-817
| -4% | -$18.4K |
|
45
PUT
Home Depot
HD
$331B
| $74.4M | 0.29% |
3,811
+372
| +11% | +$69.5K |
|
|
46
PUT
Citigroup
C
$223B
| $72.6M | 0.28% |
10,850
+2,793
| +35% | +$192K |
|
47
PUT
Mastercard
MA
$476B
| $71.5M | 0.28% |
3,638
+377
| +12% | +$70.9K |
|
|
48
PUT
Microsoft
MSFT
$2.95T
| $69.1M | 0.27% |
7,012
-750
| -10% | -$72.7K |
|
|
49
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $67.9M | 0.27% |
19,793
-25,263
| -56% | -$569K |
|
50
PUT
Caterpillar
CAT
$410B
| $67.1M | 0.26% |
4,946
-1,166
| -19% | -$174K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.