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 | |
|---|---|---|---|---|---|---|
2401
PUT
HealthEquity
HQY
$8.28B
| $52K | ﹤0.01% |
104
-9
| -8% | -$487 |
|
2402
PUT
KKR & Co
KKR
$91.3B
| $52K | ﹤0.01% |
607
+279
| +85% | +$6.2K |
|
2403
PUT
Lazard
LAZ
$4.23B
| $52K | ﹤0.01% |
319
+257
| +415% | +$14.3K |
|
2404
CALL
Nexstar Media Group
NXST
$5.67B
| $52K | ﹤0.01% |
123
-658
| -84% | -$48.4K |
|
2405
CALL
Owens Corning
OC
$11.6B
| $52K | ﹤0.01% |
272
+259
| +1,992% | +$22.6K |
|
2406
PUT
LiveRamp
RAMP
$2.3B
| $52K | ﹤0.01% |
+562
| New | +$16.1K |
|
|
SAGE
2407
DELISTED
Sage Therapeutics
SAGE
| $52K | ﹤0.01% |
323
-838
| -72% | -$142K |
|
2408
Wipro
WIT
$18.9B
| $52K | ﹤0.01% |
27,291
+7,456
| +38% | +$15.3K |
|
2409
State Street SPDR S&P Semiconductor ETF
XSD
$2.75B
| $52K | ﹤0.01% |
+745
| New | +$53.8K |
|
|
ATSG
2410
PUT
DELISTED
Air Transport Services Group
ATSG
| $52K | ﹤0.01% |
479
+179
| +60% | +$4.39K |
|
|
TIF
2411
CALL
DELISTED
Tiffany & Co.
TIF
| $52K | ﹤0.01% |
335
+13
| +4% | +$1.34K |
|
|
DERM
2412
DELISTED
Dermira, Inc.
DERM
| $52K | ﹤0.01% |
6,605
-5,154
| -44% | -$112K |
|
|
SN
2413
DELISTED
Sanchez Energy Corporation
SN
| $52K | ﹤0.01% |
+16,684
| New | +$69.1K |
|
|
ECYT
2414
PUT
DELISTED
Endocyte, Inc. Common Stock
ECYT
| $52K | ﹤0.01% |
+897
| New | +$4.95K |
|
|
CO
2415
DELISTED
Global Cord Blood Corporation
CO
| $52K | ﹤0.01% |
5,143
+4,744
| +1,189% | +$48.5K |
|
2416
CALL
Cooper Companies
COO
$13.7B
| $51K | ﹤0.01% |
640
+536
| +515% | +$31.3K |
|
2417
PUT
Criteo
CRTO
$1.05B
| $51K | ﹤0.01% |
112
-49
| -30% | -$1.33K |
|
2418
Lands' End
LE
$375M
| $51K | ﹤0.01% |
2,187
-36,008
| -94% | -$665K |
|
2419
PUT
Nektar Therapeutics
NKTR
$2.41B
| $51K | ﹤0.01% |
7
-27
| -79% | -$34.8K |
|
2420
CALL
Synopsys
SNPS
$74.5B
| $51K | ﹤0.01% |
464
+2
| +0.4% | +$176 |
|
2421
CALL
LendingTree
TREE
$564M
| $51K | ﹤0.01% |
45
+8
| +22% | +$2.88K |
|
2422
PUT
Tractor Supply
TSCO
$16.7B
| $51K | ﹤0.01% |
1,915
+235
| +14% | +$3.27K |
|
2423
PUT
Vale
VALE
$62.9B
| $51K | ﹤0.01% |
+1,367
| New | +$18K |
|
2424
CALL
Energous
WATT
$78.7M
| $51K | ﹤0.01% |
1
-1
| -50% | -$11.8K |
|
|
TELL
2425
PUT
DELISTED
Tellurian Inc.
TELL
| $51K | ﹤0.01% |
+663
| New | +$6.37K |
|
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.