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 | |
|---|---|---|---|---|---|---|
3951
NiSource
NI
$21.9B
| $153K | ﹤0.01% |
6,178
+3,019
| +96% | +$79.9K |
|
|
UCTT
3952
PUT
Ultra Clean Holdings
UCTT
$3.47B
| $153K | ﹤0.01% |
122
-109
| -47% | -$1.58K |
|
|
STML
3953
DELISTED
Stemline Therapeutics, Inc.
STML
| $153K | ﹤0.01% |
9,270
+2,232
| +32% | +$35.8K |
|
|
ANDV
3954
CALL
DELISTED
Andeavor
ANDV
| $153K | ﹤0.01% |
71
+10
| +16% | +$1.48K |
|
3955
PUT
Inseego
INSG
$111M
| $152K | ﹤0.01% |
40
+35
| +700% | +$972 |
|
3956
CALL
Texas Roadhouse
TXRH
$13.5B
| $152K | ﹤0.01% |
22
+19
| +633% | +$1.29K |
|
|
ATSG
3957
CALL
DELISTED
Air Transport Services Group
ATSG
| $152K | ﹤0.01% |
71
+23
| +48% | +$502 |
|
|
AFI
3958
DELISTED
Armstrong Flooring, Inc.
AFI
| $152K | ﹤0.01% |
+8,431
| New | +$137K |
|
|
PGNX
3959
CALL
DELISTED
Progenics Pharmaceuticals Inc
PGNX
| $152K | ﹤0.01% |
243
-499
| -67% | -$3.83K |
|
3960
PUT
Astec Industries
ASTE
$1.26B
| $151K | ﹤0.01% |
30
+29
| +2,900% | +$1.5K |
|
3961
CALL
Kornit Digital
KRNT
$708M
| $151K | ﹤0.01% |
69
+66
| +2,200% | +$1.29K |
|
3962
MPLX
MPLX
$60.1B
| $151K | ﹤0.01% |
4,373
-17,891
| -80% | -$641K |
|
|
HTGM
3963
DELISTED
HTG Molecular Diagnostics, Inc. Common Stock
HTGM
| $151K | ﹤0.01% |
166
+165
| +16,500% | +$109K |
|
|
INXN
3964
DELISTED
Interxion Holding N.V.
INXN
| $151K | ﹤0.01% |
2,253
-1,206
| -35% | -$78.2K |
|
|
CARB
3965
DELISTED
Carbonite Inc
CARB
| $151K | ﹤0.01% |
+4,253
| New | +$164K |
|
|
TOWR
3966
CALL
DELISTED
Tower International, Inc.
TOWR
| $151K | ﹤0.01% |
50
| – | – |
|
3967
CALL
Amneal Pharmaceuticals
AMRX
$5.99B
| $150K | ﹤0.01% |
68
+52
| +325% | +$1.09K |
|
3968
A10 Networks
ATEN
$2.25B
| $150K | ﹤0.01% |
24,726
+19,385
| +363% | +$131K |
|
3969
CRH
CRH
$69.1B
| $150K | ﹤0.01% |
4,591
-5,703
| -55% | -$192K |
|
3970
CALL
Caesarstone
CSTE
$71.6M
| $150K | ﹤0.01% |
81
-184
| -69% | -$3.23K |
|
3971
Cytosorbents Corp
CTSO
$23.3M
| $150K | ﹤0.01% |
11,691
-2,194
| -16% | -$27.5K |
|
3972
PUT
Honda
HMC
$39.3B
| $150K | ﹤0.01% |
50
-1
| -2% | -$30 |
|
3973
National Fuel Gas
NFG
$7.73B
| $150K | ﹤0.01% |
2,688
+2,520
| +1,500% | +$139K |
|
3974
CALL
Novanta
NOVT
$5.04B
| $150K | ﹤0.01% |
+22
| New | +$1.54K |
|
3975
PUT
Verastem
VSTM
$547M
| $150K | ﹤0.01% |
17
-14
| -45% | -$1.39K |
|
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.