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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
WES
776
DELISTED
Western Gas Partners Lp
WES
| $408K | 0.02% |
7,963
+3,421
| +75% | +$178K |
|
777
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $407K | 0.02% |
4,574
+1,715
| +60% | +$375K |
|
|
IPHI
778
DELISTED
INPHI CORPORATION
IPHI
| $406K | 0.02% |
+10,243
| New | +$384K |
|
|
BBBY
779
CALL
Bed Bath & Beyond
BBBY
$491M
| $405K | 0.02% |
474
+410
| +641% | +$6.19K |
|
780
CALL
PNC Financial Services
PNC
$101B
| $405K | 0.02% |
679
+82
| +14% | +$10.5K |
|
|
HNP
781
DELISTED
Huaneng Power Intl, Inc.
HNP
| $405K | 0.02% |
16,585
+5,224
| +46% | +$138K |
|
|
SPPI
782
DELISTED
Spectrum Pharmaceuticals Inc
SPPI
| $403K | 0.02% |
28,705
+27,360
| +2,034% | +$248K |
|
|
XLRN
783
DELISTED
Acceleron Pharma
XLRN
| $402K | 0.02% |
+10,787
| New | +$374K |
|
|
CUK
784
DELISTED
Carnival PLC
CUK
| $401K | 0.02% |
+6,231
| New | +$419K |
|
785
CALL
Avis
CAR
$5.81B
| $399K | 0.02% |
744
+12
| +2% | +$404 |
|
786
CALL
TJX Companies
TJX
$172B
| $399K | 0.02% |
1,532
+234
| +18% | +$8.34K |
|
|
XYZ
787
CALL
Block Inc
XYZ
$46.1B
| $399K | 0.02% |
1,368
+839
| +159% | +$22K |
|
|
KSU
788
CALL
DELISTED
Kansas City Southern
KSU
| $399K | 0.02% |
410
-35
| -8% | -$3.67K |
|
|
DCH
789
Dauch Corp
DCH
$1.35B
| $398K | 0.02% |
+22,685
| New | +$349K |
|
790
Silicon Motion
SIMO
$9.55B
| $398K | 0.02% |
8,292
+4,534
| +121% | +$201K |
|
791
CALL
Starbucks
SBUX
$119B
| $396K | 0.02% |
3,869
+1,629
| +73% | +$90.3K |
|
792
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$718M
| $396K | 0.02% |
1,579
+709
| +81% | +$24.5K |
|
793
PUT
Mattel
MAT
$4.18B
| $395K | 0.02% |
938
-177
| -16% | -$3.16K |
|
|
SYT
794
DELISTED
Syngenta Ag
SYT
| $395K | 0.02% |
+4,293
| New | +$396K |
|
|
MON
795
CALL
DELISTED
Monsanto Co
MON
| $394K | 0.02% |
1,876
+52
| +3% | +$6.12K |
|
796
PUT
Home Depot
HD
$330B
| $392K | 0.02% |
7,348
+4,716
| +179% | +$723K |
|
797
PUT
Vipshop
VIPS
$7.05B
| $392K | 0.02% |
1,890
+513
| +37% | +$5.34K |
|
|
SRCI
798
DELISTED
SRC Energy Inc
SRCI
| $392K | 0.02% |
+40,580
| New | +$320K |
|
799
CALL
McDonald's
MCD
$187B
| $389K | 0.02% |
1,387
+179
| +15% | +$28.1K |
|
800
Hilton Worldwide
HLT
$73.8B
| $388K | 0.02% |
5,588
-27,091
| -83% | -$1.73M |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.