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 | |
|---|---|---|---|---|---|---|
2951
GDS Holdings
GDS
$6.34B
| $363K | ﹤0.01% |
10,349
-877
| -8% | -$31.5K |
|
2952
Onto Innovation
ONTO
$13.6B
| $363K | ﹤0.01% |
+9,676
| New | +$381K |
|
|
USG
2953
PUT
DELISTED
Usg
USG
| $363K | ﹤0.01% |
84
-196
| -70% | -$8.46K |
|
|
DCH
2954
PUT
Dauch Corp
DCH
$1.3B
| $362K | ﹤0.01% |
208
-52
| -20% | -$894 |
|
|
CVGW
2955
DELISTED
Calavo Growers
CVGW
| $362K | ﹤0.01% |
+3,754
| New | +$371K |
|
2956
PUT
NIO
NIO
$11.3B
| $362K | ﹤0.01% |
+520
| New | +$4.28K |
|
|
GLOG
2957
PUT
DELISTED
GASLOG LTD
GLOG
| $361K | ﹤0.01% |
183
+65
| +55% | +$1.15K |
|
2958
Vishay Intertechnology
VSH
$5.86B
| $360K | ﹤0.01% |
17,733
+6,462
| +57% | +$152K |
|
|
DLPH
2959
PUT
DELISTED
Delphi Technologies PLC Ordinary Shares
DLPH
| $360K | ﹤0.01% |
115
+38
| +49% | +$1.5K |
|
2960
Fomento Económico Mexicano
FMX
$43.3B
| $359K | ﹤0.01% |
3,636
-16,584
| -82% | -$1.6M |
|
2961
Trinity Industries
TRN
$2.97B
| $359K | ﹤0.01% |
13,619
-12,191
| -47% | -$320K |
|
|
KEM
2962
DELISTED
KEMET Corporation
KEM
| $359K | ﹤0.01% |
19,362
+3,952
| +26% | +$97.3K |
|
2963
PUT
Geron
GERN
$911M
| $358K | ﹤0.01% |
2,036
+1,783
| +705% | +$7.77K |
|
|
PS
2964
PUT
DELISTED
Pluralsight, Inc. Class A Common Stock
PS
| $358K | ﹤0.01% |
+112
| New | +$3.29K |
|
|
XOXO
2965
PUT
DELISTED
Xo Group Inc
XOXO
| $358K | ﹤0.01% |
+104
| New | +$3.22K |
|
2966
PUT
Cognex
CGNX
$10.3B
| $357K | ﹤0.01% |
64
-14
| -18% | -$718 |
|
2967
CALL
Impinj
PI
$3.89B
| $357K | ﹤0.01% |
144
-366
| -72% | -$8.08K |
|
2968
CALL
ResMed
RMD
$28.3B
| $357K | ﹤0.01% |
31
+19
| +158% | +$2.08K |
|
|
USCR
2969
CALL
DELISTED
U S Concrete, Inc.
USCR
| $357K | ﹤0.01% |
78
-45
| -37% | -$2.26K |
|
|
SEP
2970
PUT
DELISTED
Spectra Engy Parters Lp
SEP
| $357K | ﹤0.01% |
100
+40
| +67% | +$1.48K |
|
2971
CALL
Markel Group
MKL
$25B
| $356K | ﹤0.01% |
3
-2
| -40% | -$2.35K |
|
|
SHYF
2972
CALL
DELISTED
The Shyft Group
SHYF
| $356K | ﹤0.01% |
242
+116
| +92% | +$1.73K |
|
2973
LendingTree
TREE
$544M
| $356K | ﹤0.01% |
+1,550
| New | +$368K |
|
|
2974
PUT
Vishay Intertechnology
VSH
$5.86B
| $356K | ﹤0.01% |
175
+131
| +298% | +$3.09K |
|
2975
CALL
Lexicon Pharmaceuticals
LXRX
$1.02B
| $355K | ﹤0.01% |
333
+178
| +115% | +$2.04K |
|
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.