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
|
+$148M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$67.3M |
| 3 |
Meta Platforms (Facebook)
META
|
+$63.2M |
| 4 |
Goldman Sachs
GS
|
+$23.9M |
| 5 |
Citigroup
C
|
+$23.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Berkshire Hathaway Class B
BRK.B
|
+$47.5M |
| 2 |
Apple
AAPL
|
+$46M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$44.5M |
| 4 |
Micron Technology
MU
|
+$29.1M |
| 5 |
Adobe
ADBE
|
+$22.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 1.13% |
| 2 | Communication Services | 0.89% |
| 3 | Technology | 0.68% |
| 4 | Industrials | 0.51% |
| 5 | Healthcare | 0.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3626
VeriSign
VRSN
$24.8B
| $204K | ﹤0.01% |
+1,277
| New | +$196K |
|
3627
PUT
Cato Corp
CATO
$64.1M
| $203K | ﹤0.01% |
97
-17
| -15% | -$394 |
|
3628
Altria Group
MO
$122B
| $203K | ﹤0.01% |
+3,382
| New | +$201K |
|
3629
CALL
Senseonics Holdings Inc
SENS
$262M
| $203K | ﹤0.01% |
21
+6
| +40% | +$491 |
|
3630
Alaunos Therapeutics
TCRT
$4.71M
| $203K | ﹤0.01% |
425
-4
| -0.9% | -$1.72K |
|
|
JKS
3631
JinkoSolar
JKS
$799M
| $202K | ﹤0.01% |
18,790
+18,710
| +23,388% | +$248K |
|
|
LFC
3632
PUT
DELISTED
China Life Insurance Company Ltd.
LFC
| $202K | ﹤0.01% |
178
-367
| -67% | -$4.37K |
|
|
GMLP
3633
CALL
DELISTED
Golar LNG Partners LP
GMLP
| $202K | ﹤0.01% |
141
+92
| +188% | +$1.35K |
|
|
SN
3634
DELISTED
Sanchez Energy Corporation
SN
| $202K | ﹤0.01% |
87,971
+82,638
| +1,550% | +$285K |
|
3635
PUT
Aldeyra Therapeutics
ALDX
$95.3M
| $201K | ﹤0.01% |
146
+142
| +3,550% | +$1.15K |
|
3636
PUT
Brady Corp
BRC
$4.54B
| $201K | ﹤0.01% |
+46
| New | +$1.83K |
|
3637
CALL
ProPetro Holding
PUMP
$1.32B
| $201K | ﹤0.01% |
122
+59
| +94% | +$951 |
|
|
3638
PUT
ProPetro Holding
PUMP
$1.32B
| $201K | ﹤0.01% |
122
+97
| +388% | +$1.56K |
|
|
SRDX
3639
CALL
DELISTED
Surmodics
SRDX
| $201K | ﹤0.01% |
+27
| New | +$1.86K |
|
3640
CALL
China Yuchai International
CYD
$1.75B
| $200K | ﹤0.01% |
116
-112
| -49% | -$2.16K |
|
3641
CALL
InterDigital
IDCC
$6.7B
| $200K | ﹤0.01% |
25
-11
| -31% | -$902 |
|
3642
Kodak
KODK
$788M
| $200K | ﹤0.01% |
+64,553
| New | +$211K |
|
3643
PUT
SK Telecom
SKM
$13.5B
| $200K | ﹤0.01% |
44
+43
| +4,300% | +$1.79K |
|
|
GCI
3644
PUT
DELISTED
Gannett Co., Inc
GCI
| $200K | ﹤0.01% |
200
+196
| +4,900% | +$2.01K |
|
3645
PUT
Barclays
BCS
$96.3B
| $199K | ﹤0.01% |
233
-368
| -61% | -$3.42K |
|
|
KW
3646
CALL
DELISTED
Kennedy-Wilson Holdings
KW
| $199K | ﹤0.01% |
93
-97
| -51% | -$2.08K |
|
3647
CALL
MACOM Technology Solutions
MTSI
$20.1B
| $199K | ﹤0.01% |
97
+1
| +1% | +$22 |
|
3648
CALL
Future Fuel
FF
$203M
| $198K | ﹤0.01% |
107
+20
| +23% | +$296 |
|
3649
PUT
Flex
FLEX
$42.5B
| $198K | ﹤0.01% |
200
+154
| +335% | +$1.61K |
|
3650
New Mountain Finance
NMFC
$649M
| $198K | ﹤0.01% |
14,735
+11,273
| +326% | +$156K |
|
Similar funds
Simplex Trading's Q3 2018 Portfolio in Review
As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.
- Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
- Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
- Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
- Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
- Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
- Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
- Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.
Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.