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 | |
|---|---|---|---|---|---|---|
|
TSRO
926
DELISTED
TESARO, Inc.
TSRO
| $2.72M | 0.01% |
61,221
+58,761
| +2,389% | +$2.85M |
|
927
CALL
Realty Income
O
$60.4B
| $2.72M | 0.01% |
522
+246
| +89% | +$12.5K |
|
|
EXAS
928
CALL
DELISTED
Exact Sciences
EXAS
| $2.72M | 0.01% |
455
-86
| -16% | -$4.63K |
|
|
CSOD
929
CALL
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $2.72M | 0.01% |
573
+246
| +75% | +$11.5K |
|
930
CALL
Tandem Diabetes Care
TNDM
$1.16B
| $2.71M | 0.01% |
+1,233
| New | +$15.2K |
|
931
PUT
Dollar General
DG
$25.4B
| $2.71M | 0.01% |
275
-368
| -57% | -$35.4K |
|
932
Kraft Heinz
KHC
$30.1B
| $2.71M | 0.01% |
+43,153
| New | +$2.56M |
|
933
CALL
Kinder Morgan
KMI
$72.9B
| $2.71M | 0.01% |
1,533
+1,191
| +348% | +$19.5K |
|
934
Etsy
ETSY
$7.68B
| $2.7M | 0.01% |
64,043
+42,339
| +195% | +$1.38M |
|
|
SCG
935
PUT
DELISTED
Scana
SCG
| $2.7M | 0.01% |
700
-582
| -45% | -$21.2K |
|
936
CALL
Corning
GLW
$134B
| $2.69M | 0.01% |
979
+376
| +62% | +$10.4K |
|
|
CVRR
937
CALL
DELISTED
CVR Refining, LP
CVRR
| $2.69M | 0.01% |
+1,204
| New | +$23.7K |
|
938
CALL
Jack in the Box
JACK
$263M
| $2.69M | 0.01% |
316
+250
| +379% | +$21.6K |
|
|
KYNB
939
PUT
Kyntra Bio
KYNB
$28.6M
| $2.69M | 0.01% |
17
+1
| +6% | +$1.3K |
|
940
Radware
RDWR
$1.22B
| $2.68M | 0.01% |
106,210
+104,125
| +4,994% | +$2.42M |
|
941
CALL
iShares Silver Trust
SLV
$27.8B
| $2.68M | 0.01% |
1,772
+639
| +56% | +$9.95K |
|
942
PUT
CoStar Group
CSGP
$11.1B
| $2.68M | 0.01% |
650
-450
| -41% | -$17.3K |
|
943
CALL
Agilent Technologies
A
$39.5B
| $2.67M | 0.01% |
432
-38
| -8% | -$2.48K |
|
944
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$107M
| $2.65M | 0.01% |
999
-97
| -9% | -$2.33K |
|
945
CALL
Southern Company
SO
$109B
| $2.65M | 0.01% |
572
-16
| -3% | -$716 |
|
946
Halliburton
HAL
$27.3B
| $2.65M | 0.01% |
58,717
+50,571
| +621% | +$2.52M |
|
|
GOLD
947
CALL
DELISTED
Randgold Resources Ltd
GOLD
| $2.64M | 0.01% |
343
+299
| +680% | +$23.7K |
|
948
Martin Marietta Materials
MLM
$32.8B
| $2.64M | 0.01% |
11,835
+10,338
| +691% | +$2.21M |
|
949
CALL
CF Industries
CF
$19.5B
| $2.63M | 0.01% |
593
+144
| +32% | +$5.87K |
|
950
PUT
Paycom
PAYC
$6.47B
| $2.63M | 0.01% |
266
-99
| -27% | -$10.7K |
|
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.