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 | |
|---|---|---|---|---|---|---|
|
ANSS
1576
PUT
DELISTED
Ansys
ANSS
| $1.27M | 0.01% |
73
+39
| +115% | +$6.49K |
|
1577
PUT
BGC Group
BGC
$5.58B
| $1.27M | 0.01% |
1,746
+1,107
| +173% | +$8.85K |
|
|
MRTX
1578
CALL
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.27M | 0.01% |
258
+250
| +3,125% | +$9.44K |
|
|
NEWR
1579
DELISTED
New Relic, Inc.
NEWR
| $1.27M | 0.01% |
12,622
+10,358
| +458% | +$920K |
|
|
AIMT
1580
CALL
DELISTED
Aimmune Therapeutics
AIMT
| $1.27M | 0.01% |
472
+451
| +2,148% | +$13.8K |
|
1581
Nexstar Media Group
NXST
$5.6B
| $1.27M | 0.01% |
17,275
+12,906
| +295% | +$873K |
|
1582
CALL
HubSpot
HUBS
$10.5B
| $1.27M | 0.01% |
101
-125
| -55% | -$14.8K |
|
1583
PUT
Tyler Technologies
TYL
$12.2B
| $1.26M | 0.01% |
57
-104
| -65% | -$23.4K |
|
|
GRUB
1584
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $1.26M | 0.01% |
+6,023
| New | +$1.25M |
|
|
PE
1585
PUT
DELISTED
PARSLEY ENERGY INC
PE
| $1.26M | ﹤0.01% |
415
+121
| +41% | +$3.57K |
|
1586
PUT
Avis
CAR
$5.63B
| $1.25M | ﹤0.01% |
386
+42
| +12% | +$1.83K |
|
|
CMA
1587
CALL
DELISTED
Comerica
CMA
| $1.25M | ﹤0.01% |
138
-234
| -63% | -$22.4K |
|
1588
Saia
SAIA
$11.3B
| $1.25M | ﹤0.01% |
15,497
+13,841
| +836% | +$1.07M |
|
1589
PUT
Shutterstock
SSTK
$205M
| $1.25M | ﹤0.01% |
264
+229
| +654% | +$10.9K |
|
|
MNDT
1590
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.25M | ﹤0.01% |
81,249
-11,591
| -12% | -$201K |
|
|
TSS
1591
CALL
DELISTED
Total System Services, Inc.
TSS
| $1.25M | ﹤0.01% |
148
-148
| -50% | -$12.7K |
|
|
PRSP
1592
CALL
DELISTED
Perspecta Inc. Common Stock
PRSP
| $1.25M | ﹤0.01% |
+608
| New | +$13.6K |
|
1593
CALL
Energous
WATT
$80.3M
| $1.25M | ﹤0.01% |
1
| – | – |
|
|
BBBY
1594
CALL
Bed Bath & Beyond
BBBY
$473M
| $1.25M | ﹤0.01% |
492
-831
| -63% | -$22.6K |
|
|
BERY
1595
DELISTED
Berry Global Group, Inc.
BERY
| $1.25M | ﹤0.01% |
+29,530
| New | +$1.37M |
|
1596
CALL
Protolabs
PRLB
$1.86B
| $1.24M | ﹤0.01% |
104
-8
| -7% | -$980 |
|
1597
PUT
BHP
BHP
$213B
| $1.24M | ﹤0.01% |
277
-20
| -7% | -$865 |
|
1598
CALL
Scotiabank
BNS
$106B
| $1.24M | ﹤0.01% |
216
+18
| +9% | +$1.08K |
|
1599
Upbound Group
UPBD
$1.19B
| $1.23M | ﹤0.01% |
83,873
+67,339
| +407% | +$730K |
|
|
KSU
1600
PUT
DELISTED
Kansas City Southern
KSU
| $1.23M | ﹤0.01% |
116
-21
| -15% | -$2.28K |
|
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.