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 | |
|---|---|---|---|---|---|---|
2726
CALL
Diamondback Energy
FANG
$53.7B
| $37K | ﹤0.01% |
262
-99
| -27% | -$12.5K |
|
2727
PUT
Huazhu Hotels Group
HTHT
$13.2B
| $37K | ﹤0.01% |
344
-32
| -9% | -$1.17K |
|
2728
PUT
Ichor Holdings
ICHR
$2.39B
| $37K | ﹤0.01% |
+123
| New | +$3.35K |
|
2729
CALL
KLA
KLAC
$250B
| $37K | ﹤0.01% |
1,000
-1,510
| -60% | -$16.8K |
|
2730
CALL
Karyopharm Therapeutics
KPTI
$158M
| $37K | ﹤0.01% |
6
+4
| +200% | +$798 |
|
2731
Eli Lilly
LLY
$1.09T
| $37K | ﹤0.01% |
485
-12,929
| -96% | -$1.04M |
|
2732
PUT
MPLX
MPLX
$59.9B
| $37K | ﹤0.01% |
105
-20
| -16% | -$717 |
|
2733
National CineMedia
NCMI
$371M
| $37K | ﹤0.01% |
+724
| New | +$47.8K |
|
2734
PUT
Nucor
NUE
$60.1B
| $37K | ﹤0.01% |
154
+32
| +26% | +$2.12K |
|
2735
Odyssey Marine Exploration
OMEX
$40.1M
| $37K | ﹤0.01% |
4,555
-11,505
| -72% | -$51.5K |
|
2736
Opko Health
OPK
$1.24B
| $37K | ﹤0.01% |
+11,928
| New | +$48K |
|
|
PDS
2737
Precision Drilling
PDS
$1.02B
| $37K | ﹤0.01% |
678
-155
| -19% | -$10.2K |
|
2738
PUT
Philips
PHG
$24.8B
| $37K | ﹤0.01% |
538
+408
| +314% | +$12.1K |
|
2739
PUT
PPG Industries
PPG
$27.2B
| $37K | ﹤0.01% |
209
+101
| +94% | +$11.7K |
|
2740
PUT
Amplify Junior Silver Miners ETF
SILJ
$3.21B
| $37K | ﹤0.01% |
490
+459
| +1,481% | +$5.09K |
|
|
NSLR
2741
PUT
Neostellar Capital Corp
NSLR
$269M
| $37K | ﹤0.01% |
187
+144
| +335% | +$912 |
|
2742
Unisys
UIS
$255M
| $37K | ﹤0.01% |
3,519
-15,744
| -82% | -$158K |
|
|
SSI
2743
DELISTED
Stage Stores Inc
SSI
| $37K | ﹤0.01% |
17,031
+7,767
| +84% | +$14.6K |
|
|
DO
2744
CALL
DELISTED
Diamond Offshore Drilling
DO
| $37K | ﹤0.01% |
549
-33
| -6% | -$545 |
|
2745
CALL
AstraZeneca
AZN
$268B
| $36K | ﹤0.01% |
109
-289
| -73% | -$20K |
|
|
CARM
2746
DELISTED
Carisma Therapeutics
CARM
| $36K | ﹤0.01% |
+1,721
| New | +$33K |
|
2747
PUT
Calumet Specialty Products
CLMT
$3.6B
| $36K | ﹤0.01% |
184
-35
| -16% | -$259 |
|
2748
CALL
Amdocs
DOX
$5.87B
| $36K | ﹤0.01% |
335
+79
| +31% | +$5.32K |
|
2749
PUT
Element Solutions
ESI
$8.79B
| $36K | ﹤0.01% |
+300
| New | +$3.2K |
|
2750
CALL
FirstEnergy
FE
$28.8B
| $36K | ﹤0.01% |
562
+356
| +173% | +$11.4K |
|
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.