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 | |
|---|---|---|---|---|---|---|
|
ETFC
1751
PUT
DELISTED
E*Trade Financial Corporation
ETFC
| $108K | ﹤0.01% |
1,044
+769
| +280% | +$41K |
|
1752
PUT
Equifax
EFX
$20.3B
| $107K | ﹤0.01% |
706
-420
| -37% | -$50.4K |
|
1753
CALL
Honeywell
HON
$77.1B
| $107K | ﹤0.01% |
1,003
+101
| +11% | +$14K |
|
1754
CALL
Novartis
NVS
$295B
| $107K | ﹤0.01% |
440
+4
| +0.9% | +$305 |
|
1755
ProShares UltraPro Short Dow 30
SDOW
$171M
| $107K | ﹤0.01% |
+86
| New | +$99.9K |
|
1756
PUT
VeriSign
VRSN
$25.3B
| $107K | ﹤0.01% |
541
+97
| +22% | +$11.2K |
|
1757
PUT
Winnebago Industries
WGO
$870M
| $107K | ﹤0.01% |
172
+92
| +115% | +$4.24K |
|
|
SMC
1758
PUT
Summit Midstream
SMC
$421M
| $107K | ﹤0.01% |
9
+8
| +800% | +$2.28K |
|
|
DISCK
1759
PUT
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $107K | ﹤0.01% |
1,185
-1,050
| -47% | -$23.5K |
|
1760
CALL
Papa John's
PZZA
$999M
| $106K | ﹤0.01% |
769
+645
| +520% | +$38.6K |
|
1761
CALL
Teck Resources
TECK
$29.5B
| $106K | ﹤0.01% |
1,567
-619
| -28% | -$17.4K |
|
1762
PUT
WPP
WPP
$4.04B
| $106K | ﹤0.01% |
112
+67
| +149% | +$5.96K |
|
|
TIF
1763
PUT
DELISTED
Tiffany & Co.
TIF
| $106K | ﹤0.01% |
298
-637
| -68% | -$65.7K |
|
|
ARRY
1764
CALL
DELISTED
Array Biopharma Inc
ARRY
| $106K | ﹤0.01% |
497
-274
| -36% | -$4.39K |
|
1765
Bank OZK
OZK
$5.49B
| $105K | ﹤0.01% |
2,188
-7,892
| -78% | -$399K |
|
|
SA
1766
Seabridge Gold
SA
$2.8B
| $105K | ﹤0.01% |
9,752
+5,170
| +113% | +$57.3K |
|
1767
Banco Santander
SAN
$194B
| $105K | ﹤0.01% |
+16,847
| New | +$112K |
|
1768
Silicon Motion
SIMO
$9.19B
| $105K | ﹤0.01% |
+2,200
| New | +$106K |
|
1769
CALL
Suncor Energy
SU
$77.7B
| $105K | ﹤0.01% |
1,214
+611
| +101% | +$21.3K |
|
1770
PUT
Veracyte
VCYT
$4.52B
| $105K | ﹤0.01% |
325
-1
| -0.3% | -$6 |
|
|
AEGN
1771
DELISTED
Aegion Corp
AEGN
| $105K | ﹤0.01% |
4,616
-6,530
| -59% | -$158K |
|
1772
CALL
3D Systems Corp
DDD
$420M
| $104K | ﹤0.01% |
1,102
-282
| -20% | -$3.01K |
|
1773
PUT
Illumina
ILMN
$29.4B
| $104K | ﹤0.01% |
230
-128
| -36% | -$29.3K |
|
1774
PUT
International Paper
IP
$22.3B
| $104K | ﹤0.01% |
389
-70
| -15% | -$3.89K |
|
1775
Noodles & Co
NDLS
$90.5M
| $104K | ﹤0.01% |
1,726
+1,635
| +1,797% | +$83K |
|
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.