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 | |
|---|---|---|---|---|---|---|
451
CALL
Workday
WDAY
$32.7B
| $6.92M | 0.03% |
571
+142
| +33% | +$18.2K |
|
452
PUT
Albemarle
ALB
$13.9B
| $6.89M | 0.03% |
731
-115
| -14% | -$11K |
|
453
Microsoft
MSFT
$2.9T
| $6.87M | 0.03% |
69,702
+7,519
| +12% | +$729K |
|
454
PUT
First Solar
FSLR
$22.4B
| $6.82M | 0.03% |
1,295
-201
| -13% | -$13.1K |
|
455
PUT
Dominion Energy
D
$62.5B
| $6.81M | 0.03% |
999
+909
| +1,010% | +$59.2K |
|
456
Mastercard
MA
$470B
| $6.77M | 0.03% |
34,456
-54,161
| -61% | -$10.2M |
|
|
ABMD
457
DELISTED
Abiomed Inc
ABMD
| $6.73M | 0.03% |
16,464
+16,064
| +4,016% | +$5.82M |
|
458
PUT
New Oriental
EDU
$7.75B
| $6.73M | 0.03% |
711
+249
| +54% | +$23.8K |
|
459
Marathon Petroleum
MPC
$92.2B
| $6.72M | 0.03% |
+95,738
| New | +$7.31M |
|
460
PUT
Vanguard S&P 500 ETF
VOO
$979B
| $6.67M | 0.03% |
721
-773
| -52% | -$192K |
|
461
PUT
Petrobras
PBR
$122B
| $6.65M | 0.03% |
6,635
+6,090
| +1,117% | +$78K |
|
462
PUT
Cheniere Energy
LNG
$56B
| $6.59M | 0.03% |
1,011
+612
| +153% | +$37.7K |
|
|
BLUE
463
PUT
DELISTED
bluebird bio
BLUE
| $6.56M | 0.03% |
32
+1
| +3% | +$2.28K |
|
|
WP
464
PUT
DELISTED
Worldpay, Inc.
WP
| $6.54M | 0.03% |
800
+494
| +161% | +$40.4K |
|
465
PUT
Becton Dickinson
BDX
$42.2B
| $6.54M | 0.03% |
280
-201
| -42% | -$44.7K |
|
|
CTXS
466
PUT
DELISTED
Citrix Systems Inc
CTXS
| $6.53M | 0.03% |
623
+447
| +254% | +$46K |
|
467
Lockheed Martin
LMT
$119B
| $6.53M | 0.03% |
22,104
+20,904
| +1,742% | +$6.74M |
|
468
PUT
Pfizer
PFE
$141B
| $6.52M | 0.03% |
1,895
-1,070
| -36% | -$36.6K |
|
469
Oracle
ORCL
$362B
| $6.51M | 0.03% |
147,740
+122,857
| +494% | +$5.66M |
|
470
PUT
Arista Networks
ANET
$220B
| $6.46M | 0.03% |
4,016
-1,248
| -24% | -$20.4K |
|
471
CALL
VF Corp
VFC
$6.74B
| $6.46M | 0.03% |
841
+722
| +607% | +$54.4K |
|
472
Union Pacific
UNP
$174B
| $6.45M | 0.03% |
+45,524
| New | +$6.35M |
|
473
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $6.44M | 0.03% |
1,124
+537
| +91% | +$34.1K |
|
474
3M
MMM
$89.1B
| $6.44M | 0.03% |
+39,143
| New | +$6.68M |
|
475
CALL
Nucor
NUE
$53.7B
| $6.43M | 0.03% |
1,029
+311
| +43% | +$19.9K |
|
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.