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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1726
3M
MMM
$89B
| $98K | ﹤0.01% |
+560
| New | +$97K |
|
|
VNET
1727
VNET Group
VNET
$2.05B
| $98K | ﹤0.01% |
17,304
+9,052
| +110% | +$45K |
|
|
SPLK
1728
PUT
DELISTED
Splunk Inc
SPLK
| $98K | ﹤0.01% |
448
+360
| +409% | +$22.5K |
|
|
LCI
1729
DELISTED
Lannett Company, Inc.
LCI
| $98K | ﹤0.01% |
1,340
+271
| +25% | +$19.9K |
|
|
AKAO
1730
PUT
DELISTED
Achaogen Inc
AKAO
| $98K | ﹤0.01% |
703
+457
| +186% | +$8.7K |
|
1731
CALL
Aptiv
APTV
$12B
| $97K | ﹤0.01% |
378
+41
| +12% | +$3.87K |
|
|
CIM
1732
Chimera Investment
CIM
$1.05B
| $97K | ﹤0.01% |
+1,724
| New | +$97.8K |
|
1733
CALL
Dover
DOV
$27.2B
| $97K | ﹤0.01% |
249
+50
| +25% | +$3.47K |
|
1734
CALL
MannKind Corp
MNKD
$1.28B
| $97K | ﹤0.01% |
1,498
-490
| -25% | -$769 |
|
1735
MGIC Investment
MTG
$6.27B
| $97K | ﹤0.01% |
7,764
+6,695
| +626% | +$77.8K |
|
|
NSA
1736
DELISTED
National Storage Affiliates Trust
NSA
| $97K | ﹤0.01% |
4,026
-4,102
| -50% | -$93.2K |
|
1737
CALL
Red Robin
RRGB
$134M
| $97K | ﹤0.01% |
87
+30
| +53% | +$1.82K |
|
1738
Sun Life Financial
SLF
$45.6B
| $97K | ﹤0.01% |
2,438
-6,885
| -74% | -$263K |
|
1739
PUT
Ubiquiti
UI
$31.8B
| $97K | ﹤0.01% |
1,250
+1,134
| +978% | +$65.3K |
|
|
TIF
1740
PUT
DELISTED
Tiffany & Co.
TIF
| $97K | ﹤0.01% |
852
-65
| -7% | -$5.95K |
|
|
EPE
1741
PUT
DELISTED
EP Energy Corporation
EPE
| $97K | ﹤0.01% |
271
-5
| -2% | -$16 |
|
|
ICON
1742
PUT
DELISTED
Iconix Brand Group, Inc.
ICON
| $97K | ﹤0.01% |
27
-4
| -13% | -$238 |
|
1743
CALL
Trex
TREX
$4.51B
| $96K | ﹤0.01% |
424
-28
| -6% | -$534 |
|
|
LOXO
1744
DELISTED
Loxo Oncology, Inc
LOXO
| $96K | ﹤0.01% |
+1,043
| New | +$81K |
|
|
AMRN
1745
Amarin Corp
AMRN
$284M
| $95K | ﹤0.01% |
1,369
-4,289
| -76% | -$304K |
|
1746
Camtek
CAMT
$6.9B
| $95K | ﹤0.01% |
18,647
+1,634
| +10% | +$8.05K |
|
1747
CALL
Cemex
CX
$17.4B
| $95K | ﹤0.01% |
1,833
+810
| +79% | +$7.68K |
|
1748
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$105M
| $95K | ﹤0.01% |
2,089
-136
| -6% | -$3.12K |
|
1749
VEON
VEON
$3.53B
| $95K | ﹤0.01% |
915
+857
| +1,478% | +$87.6K |
|
1750
PUT
YPF
YPF
$20.2B
| $95K | ﹤0.01% |
3,685
-146
| -4% | -$3.01K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.