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 | |
|---|---|---|---|---|---|---|
1551
CALL
Baker Hughes
BKR
$56.8B
| $1.31M | 0.01% |
396
-24
| -6% | -$815 |
|
1552
PUT
Encore Capital Group
ECPG
$1.93B
| $1.31M | 0.01% |
+357
| New | +$15K |
|
1553
Lam Research
LRCX
$382B
| $1.31M | 0.01% |
+75,560
| New | +$1.46M |
|
1554
CALL
OSI Systems
OSIS
$3.57B
| $1.31M | 0.01% |
169
-47
| -22% | -$3.28K |
|
1555
Live Nation Entertainment
LYV
$41.2B
| $1.3M | 0.01% |
26,867
+22,827
| +565% | +$977K |
|
1556
CALL
FMC
FMC
$1.42B
| $1.3M | 0.01% |
168
-353
| -68% | -$26.2K |
|
1557
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.3M | 0.01% |
26,994
-10,573
| -28% | -$555K |
|
1558
PUT
Labcorp
LH
$24.3B
| $1.29M | 0.01% |
84
+22
| +35% | +$3.32K |
|
|
SGI
1559
Somnigroup International
SGI
$15.1B
| $1.29M | 0.01% |
107,564
+57,204
| +114% | +$674K |
|
1560
Cognizant
CTSH
$21.5B
| $1.29M | 0.01% |
16,299
+2,402
| +17% | +$189K |
|
1561
CALL
Nutrien
NTR
$32.7B
| $1.29M | 0.01% |
237
-133
| -36% | -$6.6K |
|
1562
PUT
GATX Corp
GATX
$6.55B
| $1.28M | 0.01% |
+173
| New | +$12.2K |
|
|
GSKY
1563
DELISTED
GreenSky, Inc. Class A Common Stock
GSKY
| $1.28M | 0.01% |
+60,729
| New | +$1.46M |
|
1564
ProShares Ultra Bloomberg Crude Oil
UCO
$443M
| $1.28M | 0.01% |
5,972
-1,678
| -22% | -$314K |
|
1565
CALL
Aflac
AFL
$63.9B
| $1.28M | 0.01% |
298
-354
| -54% | -$15.9K |
|
1566
PUT
Universal Health Services
UHS
$9.43B
| $1.28M | 0.01% |
115
+23
| +25% | +$2.69K |
|
|
SCIU
1567
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $1.28M | 0.01% |
596
-267
| -31% | -$8.37K |
|
|
MRSH
1568
PUT
Marsh
MRSH
$86.3B
| $1.28M | 0.01% |
156
+1
| +0.6% | +$82 |
|
1569
CALL
SolarEdge
SEDG
$2.59B
| $1.28M | 0.01% |
267
+115
| +76% | +$6.37K |
|
|
DNKN
1570
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $1.28M | 0.01% |
+18,502
| New | +$1.19M |
|
1571
Okta
OKTA
$24.1B
| $1.28M | 0.01% |
25,350
+9,095
| +56% | +$433K |
|
1572
PUT
Alaska Air
ALK
$5.15B
| $1.27M | 0.01% |
211
-422
| -67% | -$26.1K |
|
1573
CALL
Trinity Industries
TRN
$2.97B
| $1.27M | 0.01% |
517
+239
| +86% | +$5.75K |
|
|
VAR
1574
DELISTED
Varian Medical Systems, Inc.
VAR
| $1.27M | 0.01% |
+11,205
| New | +$1.34M |
|
1575
McKesson
MCK
$98.5B
| $1.27M | 0.01% |
9,538
+9,438
| +9,438% | +$1.38M |
|
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.