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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ESRX
601
PUT
DELISTED
Express Scripts Holding Company
ESRX
| $633K | 0.03% |
1,649
-143
| -8% | -$10.9K |
|
602
CALL
Casey's General Stores
CASY
$32.4B
| $631K | 0.03% |
5,510
+5,466
| +12,423% | +$633K |
|
603
PUT
SPDR Gold Trust
GLD
$130B
| $630K | 0.03% |
4,902
+1,096
| +29% | +$138K |
|
604
Honda
HMC
$36.3B
| $630K | 0.03% |
18,168
-3,830
| -17% | -$135K |
|
605
Vanguard Total Stock Market ETF
VTI
$654B
| $630K | 0.03% |
4,644
-7,444
| -62% | -$1.04M |
|
606
CALL
Starbucks
SBUX
$118B
| $625K | 0.03% |
3,299
+1,402
| +74% | +$81K |
|
607
iShare MSCI Eurozone ETF
EZU
$9.36B
| $624K | 0.03% |
14,405
+10,158
| +239% | +$452K |
|
608
Ironwood Pharmaceuticals
IRWD
$624M
| $623K | 0.03% |
48,273
+39,273
| +436% | +$489K |
|
609
Vertex Pharmaceuticals
VRTX
$120B
| $623K | 0.03% |
+3,823
| New | +$624K |
|
610
Capital One
COF
$123B
| $622K | 0.03% |
+6,497
| New | +$647K |
|
611
National Beverage
FIZZ
$2.86B
| $622K | 0.03% |
13,990
+5,142
| +58% | +$253K |
|
612
CALL
Deere & Co
DE
$165B
| $621K | 0.03% |
1,278
+613
| +92% | +$99.4K |
|
613
Direxion Daily Aerospace & Defense Bull 3X ETF
DFEN
$378M
| $616K | 0.03% |
+12,390
| New | +$631K |
|
614
CALL
KRONOS Worldwide
KRO
$764M
| $616K | 0.03% |
27,131
+27,120
| +246,545% | +$675K |
|
615
CALL
Chevron
CVX
$387B
| $615K | 0.03% |
2,710
+53
| +2% | +$6.34K |
|
616
CALL
Marriott International
MAR
$96.1B
| $614K | 0.03% |
999
-150
| -13% | -$21K |
|
617
PUT
Western Digital
WDC
$192B
| $614K | 0.03% |
3,556
-35
| -1% | -$2.36K |
|
|
RTN
618
CALL
DELISTED
Raytheon Company
RTN
| $614K | 0.03% |
660
+301
| +84% | +$62.3K |
|
619
CALL
Accenture
ACN
$84.9B
| $612K | 0.03% |
726
-572
| -44% | -$90.6K |
|
620
CALL
Biogen
BIIB
$29.6B
| $611K | 0.03% |
701
-207
| -23% | -$64.3K |
|
621
CALL
Twilio
TWLO
$28.1B
| $611K | 0.03% |
922
+380
| +70% | +$12K |
|
622
Commault Systems
CVLT
$5.85B
| $610K | 0.03% |
10,676
+10,276
| +2,569% | +$554K |
|
623
Etsy
ETSY
$7.68B
| $609K | 0.03% |
21,704
+16,602
| +325% | +$373K |
|
|
P
624
Everpure Inc
P
$25B
| $608K | 0.03% |
30,487
-22,478
| -42% | -$441K |
|
|
MBT
625
DELISTED
Mobile TeleSystems Public Joint Stock Company American Depositary Shares (Each representing 2 Shares
MBT
| $608K | 0.03% |
+53,452
| New | +$623K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.