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 | |
|---|---|---|---|---|---|---|
|
TVTY
1726
CALL
DELISTED
Tivity Health, Inc. Common Stock
TVTY
| $112K | ﹤0.01% |
198
-255
| -56% | -$9.9K |
|
1727
American Superconductor
AMSC
$1.48B
| $111K | ﹤0.01% |
19,211
-63,883
| -77% | -$328K |
|
|
ANSS
1728
DELISTED
Ansys
ANSS
| $111K | ﹤0.01% |
709
-301
| -30% | -$48.1K |
|
1729
Amplify Mobile Payments ETF
IPAY
$154M
| $111K | ﹤0.01% |
3,068
+2,542
| +483% | +$93.8K |
|
1730
M/I Homes
MHO
$3.83B
| $111K | ﹤0.01% |
+3,487
| New | +$114K |
|
1731
CALL
Red Robin
RRGB
$134M
| $111K | ﹤0.01% |
134
-95
| -41% | -$5.29K |
|
1732
CALL
Stanley Black & Decker
SWK
$14.2B
| $111K | ﹤0.01% |
129
-102
| -44% | -$16.6K |
|
1733
Xcel Energy
XEL
$51B
| $111K | ﹤0.01% |
2,459
+1,825
| +288% | +$81.3K |
|
|
ESPR
1734
PUT
DELISTED
Esperion Therapeutics
ESPR
| $110K | ﹤0.01% |
259
+216
| +502% | +$15.9K |
|
1735
InfraCap MLP ETF
AMZA
$471M
| $109K | ﹤0.01% |
1,604
-1,158
| -42% | -$93.4K |
|
1736
CALL
Bloomin' Brands
BLMN
$680M
| $109K | ﹤0.01% |
+598
| New | +$13.5K |
|
1737
CEVA Inc
CEVA
$1.01B
| $109K | ﹤0.01% |
3,018
+2,903
| +2,524% | +$118K |
|
1738
DigitalBridge
DBRG
$2.94B
| $109K | ﹤0.01% |
+4,884
| New | +$159K |
|
1739
CALL
DexCom
DXCM
$27.6B
| $109K | ﹤0.01% |
780
+264
| +51% | +$3.9K |
|
1740
PUT
National Beverage
FIZZ
$2.87B
| $109K | ﹤0.01% |
244
-318
| -57% | -$15.6K |
|
1741
Hyatt Hotels
H
$17.6B
| $109K | ﹤0.01% |
1,442
-4,687
| -76% | -$368K |
|
1742
PUT
HSBC
HSBC
$355B
| $109K | ﹤0.01% |
1,044
-580
| -36% | -$27.6K |
|
1743
PUT
Progress Software
PRGS
$1.55B
| $109K | ﹤0.01% |
+280
| New | +$12.8K |
|
1744
CALL
Royal Bank of Canada
RY
$291B
| $109K | ﹤0.01% |
504
+40
| +9% | +$3.25K |
|
1745
Trupanion
TRUP
$1.05B
| $109K | ﹤0.01% |
3,674
+565
| +18% | +$18.1K |
|
|
LCI
1746
DELISTED
Lannett Company, Inc.
LCI
| $109K | ﹤0.01% |
1,712
-3,390
| -66% | -$261K |
|
|
WPX
1747
DELISTED
WPX Energy, Inc.
WPX
| $109K | ﹤0.01% |
7,376
-2,631
| -26% | -$37.9K |
|
|
PEI
1748
DELISTED
Pennsylvania Real Estate Investment Trust
PEI
| $109K | ﹤0.01% |
757
-78
| -9% | -$12.4K |
|
1749
Bright Horizons
BFAM
$3.99B
| $108K | ﹤0.01% |
+1,089
| New | +$106K |
|
|
K
1750
PUT
DELISTED
Kellanova
K
| $108K | ﹤0.01% |
985
-156
| -14% | -$9.84K |
|
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.