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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
801
CALL
TSMC
TSM
$2.15T
| $3.27M | 0.01% |
894
+572
| +178% | +$22.6K |
|
802
CALL
Madison Square Garden
MSGS
$9.53B
| $3.26M | 0.01% |
147
+60
| +69% | +$11.1K |
|
803
PUT
Radware
RDWR
$1.22B
| $3.25M | 0.01% |
+1,285
| New | +$29.9K |
|
804
CALL
BioMarin Pharmaceuticals
BMRN
$11.3B
| $3.23M | 0.01% |
343
+280
| +444% | +$24.5K |
|
|
805
PUT
Madison Square Garden
MSGS
$9.53B
| $3.23M | 0.01% |
146
-545
| -79% | -$101K |
|
806
PUT
Vanguard FTSE Europe ETF
VGK
$29.7B
| $3.23M | 0.01% |
710
+423
| +147% | +$24.9K |
|
807
CALL
Etsy
ETSY
$7.56B
| $3.22M | 0.01% |
763
+621
| +437% | +$20.2K |
|
808
PUT
Agios Pharmaceuticals
AGIO
$2.16B
| $3.22M | 0.01% |
382
+99
| +35% | +$8.63K |
|
|
USG
809
CALL
DELISTED
Usg
USG
| $3.22M | 0.01% |
746
+148
| +25% | +$6.15K |
|
|
LOGM
810
PUT
DELISTED
LogMein, Inc.
LOGM
| $3.21M | 0.01% |
311
+289
| +1,314% | +$32.3K |
|
811
PUT
PACCAR
PCAR
$69.2B
| $3.21M | 0.01% |
777
-30
| -4% | -$1.3K |
|
812
CALL
Yum! Brands
YUM
$40.4B
| $3.21M | 0.01% |
410
-156
| -28% | -$13K |
|
813
PUT
Emerson Electric
EMR
$80.7B
| $3.2M | 0.01% |
463
+437
| +1,681% | +$30.7K |
|
814
PUT
GameStop
GME
$9.6B
| $3.2M | 0.01% |
8,788
+3,760
| +75% | +$12.9K |
|
815
CALL
Labcorp
LH
$23.9B
| $3.19M | 0.01% |
207
+174
| +527% | +$26.3K |
|
|
RTN
816
DELISTED
Raytheon Company
RTN
| $3.18M | 0.01% |
16,485
-14,229
| -46% | -$2.99M |
|
817
CALL
Illinois Tool Works
ITW
$79B
| $3.17M | 0.01% |
229
-199
| -46% | -$29.5K |
|
818
CALL
Helen of Troy
HELE
$601M
| $3.17M | 0.01% |
322
+139
| +76% | +$12.7K |
|
819
CALL
Prudential Financial
PRU
$40.8B
| $3.17M | 0.01% |
339
-96
| -22% | -$9.7K |
|
|
BRSL
820
CALL
Brightstar Lottery PLC
BRSL
$1.88B
| $3.15M | 0.01% |
1,355
+980
| +261% | +$26.1K |
|
|
FOLD
821
CALL
DELISTED
Amicus Therapeutics
FOLD
| $3.15M | 0.01% |
2,016
+1,630
| +422% | +$24.6K |
|
|
JWN
822
PUT
DELISTED
Nordstrom
JWN
| $3.14M | 0.01% |
606
+81
| +15% | +$4.02K |
|
823
CALL
Cognizant
CTSH
$20.2B
| $3.11M | 0.01% |
394
-663
| -63% | -$52.1K |
|
824
PUT
National Beverage
FIZZ
$2.82B
| $3.11M | 0.01% |
582
+338
| +139% | +$15.9K |
|
825
PUT
Hain Celestial
HAIN
$49.5M
| $3.11M | 0.01% |
1,043
+537
| +106% | +$15.4K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.