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 | |
|---|---|---|---|---|---|---|
3726
PUT
American Water Works
AWK
$27.1B
| $184K | ﹤0.01% |
21
-24
| -53% | -$2.11K |
|
3727
PUT
Integra LifeSciences
IART
$1.57B
| $184K | ﹤0.01% |
28
+18
| +180% | +$1.12K |
|
3728
CALL
Kratos Defense & Security Solutions
KTOS
$8.88B
| $184K | ﹤0.01% |
125
-586
| -82% | -$7.74K |
|
3729
PUT
Martin Midstream Partners
MMLP
$97M
| $184K | ﹤0.01% |
159
+109
| +218% | +$1.35K |
|
3730
CALL
Myriad Genetics
MYGN
$503M
| $184K | ﹤0.01% |
40
-11
| -22% | -$489 |
|
|
QUOT
3731
PUT
DELISTED
Quotient Technology Inc
QUOT
| $184K | ﹤0.01% |
119
+69
| +138% | +$1.01K |
|
|
ABB
3732
PUT
DELISTED
ABB Ltd
ABB
| $184K | ﹤0.01% |
78
-50
| -39% | -$1.15K |
|
|
ARNA
3733
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $184K | ﹤0.01% |
4,000
-5,074
| -56% | -$206K |
|
3734
BOK Financial
BOKF
$8.61B
| $183K | ﹤0.01% |
1,882
+1,020
| +118% | +$102K |
|
3735
CALL
Bruker
BRKR
$9.54B
| $183K | ﹤0.01% |
+55
| New | +$1.81K |
|
3736
Domo
DOMO
$162M
| $183K | ﹤0.01% |
+8,570
| New | +$170K |
|
3737
MillerKnoll
MLKN
$1.59B
| $183K | ﹤0.01% |
+4,768
| New | +$181K |
|
3738
CALL
Vishay Intertechnology
VSH
$5.13B
| $183K | ﹤0.01% |
90
+46
| +105% | +$1.08K |
|
|
STOR
3739
PUT
DELISTED
STORE Capital Corporation
STOR
| $183K | ﹤0.01% |
66
-11
| -14% | -$310 |
|
|
MIME
3740
DELISTED
Mimecast Limited
MIME
| $183K | ﹤0.01% |
+4,390
| New | +$178K |
|
|
OCLR
3741
PUT
DELISTED
Oclaro Inc.
OCLR
| $183K | ﹤0.01% |
205
+44
| +27% | +$399 |
|
|
CTLP
3742
DELISTED
Cantaloupe
CTLP
| $182K | ﹤0.01% |
25,351
+16,664
| +192% | +$230K |
|
3743
CALL
Strategy Inc
MSTR
$35B
| $182K | ﹤0.01% |
130
-330
| -72% | -$4.63K |
|
|
ZN
3744
CALL
DELISTED
Zion Oil & Gas, Inc.
ZN
| $182K | ﹤0.01% |
1,424
+1,220
| +598% | +$2.85K |
|
|
CALL
3745
CALL
DELISTED
magicJack VocalTec Ltd
CALL
| $182K | ﹤0.01% |
218
+214
| +5,350% | +$1.82K |
|
3746
Bilibili
BILI
$7.5B
| $181K | ﹤0.01% |
13,438
+8,548
| +175% | +$106K |
|
3747
CALL
Cerus
CERS
$597M
| $181K | ﹤0.01% |
252
-482
| -66% | -$3.5K |
|
3748
East-West Bancorp
EWBC
$17.9B
| $181K | ﹤0.01% |
3,011
+2,863
| +1,934% | +$184K |
|
3749
PUT
Kornit Digital
KRNT
$707M
| $181K | ﹤0.01% |
83
+70
| +538% | +$1.37K |
|
|
MODV
3750
CALL
DELISTED
ModivCare
MODV
| $181K | ﹤0.01% |
27
+19
| +238% | +$1.32K |
|
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.