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 | |
|---|---|---|---|---|---|---|
|
EXAS
551
DELISTED
Exact Sciences
EXAS
| $694K | 0.03% |
17,227
+8,503
| +97% | +$415K |
|
552
Children's Place
PLCE
$58.7M
| $694K | 0.03% |
5,135
+2,793
| +119% | +$406K |
|
|
FINL
553
CALL
DELISTED
Finish Line
FINL
| $690K | 0.03% |
4,627
+3,470
| +300% | +$40K |
|
554
PENN Entertainment
PENN
$2.71B
| $689K | 0.03% |
26,268
+19,185
| +271% | +$554K |
|
|
ZGNX
555
DELISTED
Zogenix, Inc.
ZGNX
| $688K | 0.03% |
+17,181
| New | +$681K |
|
556
Delek US
DK
$3.97B
| $684K | 0.03% |
+16,819
| New | +$605K |
|
557
State Street Industrial Select Sector SPDR ETF
XLI
$33.7B
| $682K | 0.03% |
+9,187
| New | +$708K |
|
|
JOBS
558
DELISTED
51job Inc
JOBS
| $681K | 0.03% |
7,917
-3,417
| -30% | -$247K |
|
|
XEC
559
DELISTED
CIMAREX ENERGY CO
XEC
| $677K | 0.03% |
7,247
+1,071
| +17% | +$114K |
|
560
Covenant Logistics
CVLG
$1.21B
| $673K | 0.03% |
45,160
+34,792
| +336% | +$488K |
|
|
KW
561
DELISTED
Kennedy-Wilson Holdings
KW
| $673K | 0.03% |
38,713
+487
| +1% | +$8.35K |
|
562
CALL
RTX Corp
RTX
$282B
| $672K | 0.03% |
3,437
+1,503
| +78% | +$124K |
|
|
ITCI
563
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $670K | 0.03% |
31,842
-525
| -2% | -$10.2K |
|
|
SNP
564
DELISTED
CHINA PETROLEUM & CHEMICAL CORPORATION ADS (REP 100 ORDINARY H SHARES)
SNP
| $670K | 0.03% |
+7,577
| New | +$625K |
|
565
CALL
AbbVie
ABBV
$454B
| $668K | 0.03% |
4,835
+2,247
| +87% | +$247K |
|
|
JOYY
566
PUT
JOYY Inc
JOYY
$3.66B
| $668K | 0.03% |
430
+18
| +4% | +$2.27K |
|
|
CERN
567
DELISTED
Cerner Corp
CERN
| $668K | 0.03% |
+11,524
| New | +$749K |
|
568
Corpay
CPAY
$23.8B
| $667K | 0.03% |
3,298
+1,727
| +110% | +$350K |
|
569
PUT
Lowe's Companies
LOW
$113B
| $664K | 0.03% |
2,881
+805
| +39% | +$76.2K |
|
570
AptarGroup
ATR
$8.23B
| $662K | 0.03% |
+7,378
| New | +$651K |
|
571
WPP
WPP
$3.91B
| $661K | 0.03% |
+8,317
| New | +$739K |
|
572
PUT
Ulta Beauty
ULTA
$20.5B
| $660K | 0.03% |
858
-106
| -11% | -$22.9K |
|
|
573
CALL
Lowe's Companies
LOW
$113B
| $659K | 0.03% |
2,337
+338
| +17% | +$32K |
|
|
GBT
574
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $658K | 0.03% |
+13,635
| New | +$761K |
|
575
Copa Holdings
CPA
$5.54B
| $656K | 0.03% |
5,101
+380
| +8% | +$51K |
|
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.