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 | Miscellaneous | 56% |
| 2 | Consumer Discretionary | 7.95% |
| 3 | Communication Services | 7.36% |
| 4 | Technology | 6.39% |
| 5 | Financials | 5.53% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
901
Nasdaq
NDAQ
$54.2B
| $348K | 0.02% |
+12,123
| New | +$327K |
|
902
CALL
Verizon
VZ
$208B
| $348K | 0.02% |
3,512
-266
| -7% | -$13.4K |
|
|
ECHO
903
DELISTED
Echo Global Logistics, Inc.
ECHO
| $348K | 0.02% |
+12,639
| New | +$355K |
|
|
QIWI
904
DELISTED
QIWI PLC
QIWI
| $348K | 0.02% |
18,228
+7,904
| +77% | +$135K |
|
905
State Street SPDR S&P Bank ETF
KBE
$1.62B
| $347K | 0.02% |
+7,254
| New | +$361K |
|
906
CALL
ProShares UltraShort Health Care
RXD
$3.06M
| $347K | 0.02% |
711
-504
| -41% | -$56.7K |
|
907
PUT
Newell Brands
NWL
$2.6B
| $346K | 0.02% |
1,498
-1,180
| -44% | -$33.4K |
|
|
LJPC
908
DELISTED
La Jolla Pharmaceutical Company
LJPC
| $346K | 0.02% |
11,638
-5,783
| -33% | -$186K |
|
909
CALL
Insulet
PODD
$10.2B
| $345K | 0.02% |
3,933
+3,703
| +1,610% | +$288K |
|
910
CALL
ServiceNow
NOW
$146B
| $342K | 0.02% |
2,895
+1,660
| +134% | +$51.2K |
|
911
Global X Silver Miners ETF NEW
SIL
$5.31B
| $342K | 0.02% |
11,150
-966
| -8% | -$30.2K |
|
912
CALL
Akamai
AKAM
$15.1B
| $341K | 0.02% |
357
-113
| -24% | -$7.69K |
|
913
PUT
Bristol-Myers Squibb
BMY
$136B
| $341K | 0.02% |
3,254
+130
| +4% | +$8.36K |
|
914
CALL
GE Aerospace
GE
$350B
| $341K | 0.02% |
1,813
+833
| +85% | +$61.7K |
|
915
Alaunos Therapeutics
TCRT
$4.14M
| $341K | 0.02% |
582
+421
| +261% | +$262K |
|
916
PUT
New Oriental
EDU
$9.47B
| $340K | 0.01% |
462
+100
| +28% | +$9.31K |
|
917
La-Z-Boy
LZB
$1.31B
| $340K | 0.01% |
11,364
+7,468
| +192% | +$229K |
|
918
CALL
Westlake Corp
WLK
$9.56B
| $340K | 0.01% |
3,071
+3,064
| +43,771% | +$341K |
|
|
ATHN
919
DELISTED
Athenahealth, Inc.
ATHN
| $340K | 0.01% |
+2,383
| New | +$326K |
|
920
PUT
Arista Networks
ANET
$244B
| $339K | 0.01% |
5,264
+1,680
| +47% | +$28.3K |
|
921
PUT
APA Corp
APA
$15B
| $339K | 0.01% |
687
-61
| -8% | -$2.45K |
|
922
Jones Lang LaSalle
JLL
$16.7B
| $339K | 0.01% |
1,943
-223
| -10% | -$35.8K |
|
|
MOMO
923
PUT
Hello Group
MOMO
$710M
| $339K | 0.01% |
1,212
-1,032
| -46% | -$32.8K |
|
924
Box
BOX
$4.83B
| $338K | 0.01% |
16,457
+15,677
| +2,010% | +$337K |
|
925
PUT
Goodyear
GT
$1.8B
| $338K | 0.01% |
876
-57
| -6% | -$1.76K |
|
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 $319M 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 Miscellaneous at 56% of assets, up from 44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
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.