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 | |
|---|---|---|---|---|---|---|
|
RDS.A
851
PUT
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $387K | 0.02% |
2,576
-173
| -6% | -$11.4K |
|
|
SIEN
852
DELISTED
Sientra, Inc.
SIEN
| $386K | 0.02% |
3,997
+3,600
| +907% | +$397K |
|
853
CALL
Oracle
ORCL
$331B
| $385K | 0.02% |
5,207
+2,893
| +125% | +$144K |
|
854
Halliburton
HAL
$27.9B
| $382K | 0.02% |
8,146
-100,364
| -92% | -$4.95M |
|
855
Yum! Brands
YUM
$41B
| $382K | 0.02% |
+4,495
| New | +$368K |
|
856
Dropbox
DBX
$6.81B
| $381K | 0.02% |
+12,208
| New | +$369K |
|
857
CALL
GSK
GSK
$103B
| $381K | 0.02% |
1,750
+1,312
| +300% | +$61.1K |
|
858
CALL
ProShares Ultra S&P500
SSO
$7.82B
| $381K | 0.02% |
4,680
-200
| -4% | -$2.84K |
|
|
PAY
859
DELISTED
Verifone Systems Inc
PAY
| $381K | 0.02% |
24,805
+9,628
| +63% | +$168K |
|
860
Insight Enterprises
NSIT
$3.55B
| $380K | 0.02% |
10,901
+10,513
| +2,710% | +$380K |
|
861
First Horizon
FHN
$12.1B
| $379K | 0.02% |
+20,171
| New | +$397K |
|
862
Coca-Cola
KO
$354B
| $379K | 0.02% |
8,732
-18,590
| -68% | -$835K |
|
|
CLR
863
CALL
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $379K | 0.02% |
354
-327
| -48% | -$17.6K |
|
864
Idexx Laboratories
IDXX
$42.9B
| $378K | 0.02% |
+1,977
| New | +$365K |
|
865
Ralph Lauren
RL
$22.2B
| $377K | 0.02% |
3,379
-9,711
| -74% | -$1.05M |
|
866
PUT
Weibo
WB
$1.9B
| $377K | 0.02% |
633
-254
| -29% | -$32.4K |
|
|
BECN
867
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $377K | 0.02% |
+7,104
| New | +$409K |
|
|
PF
868
PUT
DELISTED
Pinnacle Foods, Inc.
PF
| $376K | 0.02% |
997
+541
| +119% | +$31.2K |
|
869
Match Group
MTCH
$8.84B
| $373K | 0.02% |
8,407
-3,076
| -27% | -$119K |
|
870
CALL
United Airlines
UAL
$38.4B
| $373K | 0.02% |
2,475
+157
| +7% | +$10.8K |
|
|
VIAB
871
PUT
DELISTED
Viacom Inc. Class B
VIAB
| $370K | 0.02% |
1,103
-1,634
| -60% | -$52.8K |
|
872
Hartford Financial Services
HIG
$38.5B
| $369K | 0.02% |
7,166
-20,585
| -74% | -$1.13M |
|
|
PPLC
873
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $369K | 0.02% |
618
-227
| -27% | -$8.39K |
|
|
FITB
874
CALL
Fifth Third Bancorp
FITB
$52B
| $368K | 0.02% |
495
-542
| -52% | -$17.7K |
|
875
Wheaton Precious Metals
WPM
$50.6B
| $368K | 0.02% |
+18,113
| New | +$372K |
|
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.