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 | |
|---|---|---|---|---|---|---|
1876
iShares MSCI India ETF
INDA
$6.71B
| $91K | ﹤0.01% |
+2,687
| New | +$95.4K |
|
|
MAG
1877
DELISTED
MAG Silver
MAG
| $91K | ﹤0.01% |
9,410
-3,194
| -25% | -$34.8K |
|
1878
PUT
Madison Square Garden
MSGS
$9.54B
| $91K | ﹤0.01% |
691
+579
| +517% | +$93.7K |
|
1879
PUT
Nabors Industries
NBR
$1.23B
| $91K | ﹤0.01% |
9
-4
| -31% | -$1.46K |
|
|
ODP
1880
DELISTED
ODP
ODP
| $91K | ﹤0.01% |
4,263
+4,061
| +2,010% | +$120K |
|
1881
Ring Energy
REI
$322M
| $91K | ﹤0.01% |
6,410
+1,274
| +25% | +$18.5K |
|
1882
PUT
Safe Bulkers
SB
$781M
| $91K | ﹤0.01% |
519
+362
| +231% | +$1.28K |
|
1883
Vanguard FTSE Pacific ETF
VPL
$8.05B
| $91K | ﹤0.01% |
1,261
+1,114
| +758% | +$82.5K |
|
|
DISCK
1884
CALL
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $91K | ﹤0.01% |
642
-752
| -54% | -$16.8K |
|
|
FCE.A
1885
DELISTED
Forest City Realty Trust, Inc.
FCE.A
| $91K | ﹤0.01% |
+4,508
| New | +$100K |
|
1886
PUT
Banco Macro
BMA
$5.7B
| $90K | ﹤0.01% |
401
+57
| +17% | +$6.18K |
|
1887
Dolby
DLB
$4.72B
| $90K | ﹤0.01% |
1,425
-1,081
| -43% | -$69.5K |
|
1888
PUT
Kratos Defense & Security Solutions
KTOS
$8.88B
| $90K | ﹤0.01% |
518
+383
| +284% | +$4.27K |
|
1889
Liberty Global Class A
LBTYA
$3.31B
| $90K | ﹤0.01% |
+2,905
| New | +$100K |
|
1890
PUT
Motorola Solutions
MSI
$69.4B
| $90K | ﹤0.01% |
420
+213
| +103% | +$21.8K |
|
1891
CALL
Becton Dickinson
BDX
$43.1B
| $89K | ﹤0.01% |
125
-21
| -14% | -$4.6K |
|
1892
Central Garden & Pet Co
CENT
$2.74B
| $89K | ﹤0.01% |
+2,593
| New | +$81.9K |
|
1893
PUT
Digital Realty Trust
DLR
$73.7B
| $89K | ﹤0.01% |
323
+145
| +81% | +$15.3K |
|
1894
Korn Ferry
KFY
$3.98B
| $89K | ﹤0.01% |
+1,728
| New | +$76.9K |
|
1895
PUT
Middleby
MIDD
$6.05B
| $89K | ﹤0.01% |
237
+206
| +665% | +$27K |
|
1896
PUT
Upbound Group
UPBD
$1.19B
| $89K | ﹤0.01% |
714
-98
| -12% | -$941 |
|
1897
W.R. Berkley
WRB
$28B
| $89K | ﹤0.01% |
4,161
+1,032
| +33% | +$21.5K |
|
|
SPLK
1898
PUT
DELISTED
Splunk Inc
SPLK
| $89K | ﹤0.01% |
384
+293
| +322% | +$28K |
|
|
SWCH
1899
DELISTED
Switch, Inc. Class A Common Stock
SWCH
| $89K | ﹤0.01% |
+5,634
| New | +$89.2K |
|
1900
Ethan Allen Interiors
ETD
$581M
| $88K | ﹤0.01% |
3,851
+3,673
| +2,063% | +$92.5K |
|
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.