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 | |
|---|---|---|---|---|---|---|
4076
PUT
e.l.f. Beauty
ELF
$4.96B
| $138K | ﹤0.01% |
109
+75
| +221% | +$1.03K |
|
4077
Exelixis
EXEL
$14.2B
| $138K | ﹤0.01% |
7,836
+7,436
| +1,859% | +$145K |
|
4078
CALL
NBT Bancorp
NBTB
$2.79B
| $138K | ﹤0.01% |
36
+26
| +260% | +$1.04K |
|
|
VSLR
4079
CALL
DELISTED
VIVINT SOLAR, INC.
VSLR
| $138K | ﹤0.01% |
266
+217
| +443% | +$1.15K |
|
|
TOO
4080
PUT
DELISTED
Teekay Offshore Partners L.P.
TOO
| $138K | ﹤0.01% |
594
-834
| -58% | -$2.03K |
|
|
USG
4081
CALL
DELISTED
Usg
USG
| $138K | ﹤0.01% |
32
-714
| -96% | -$30.8K |
|
|
WIN
4082
CALL
DELISTED
Windstream Holdings Inc
WIN
| $138K | ﹤0.01% |
284
+261
| +1,135% | +$1.18K |
|
4083
PUT
Ascent Industries
ACNT
$140M
| $137K | ﹤0.01% |
+60
| New | +$1.32K |
|
4084
Donnelley Financial Solutions
DFIN
$1.31B
| $137K | ﹤0.01% |
7,649
-3,027
| -28% | -$59.9K |
|
4085
Lexicon Pharmaceuticals
LXRX
$1.04B
| $137K | ﹤0.01% |
12,929
+12,820
| +11,761% | +$147K |
|
4086
CALL
Opko Health
OPK
$1.23B
| $137K | ﹤0.01% |
397
+225
| +131% | +$1.2K |
|
4087
PUT
Pan American Silver
PAAS
$18.2B
| $137K | ﹤0.01% |
93
-38
| -29% | -$607 |
|
4088
PUT
Quad
QUAD
$434M
| $137K | ﹤0.01% |
66
+23
| +53% | +$496 |
|
4089
CALL
VirnetX Holding Corp
VHC
$54.4M
| $137K | ﹤0.01% |
15
+7
| +88% | +$476 |
|
4090
Zumiez
ZUMZ
$347M
| $137K | ﹤0.01% |
+5,202
| New | +$136K |
|
|
CAI
4091
PUT
DELISTED
CAI International, Inc.
CAI
| $137K | ﹤0.01% |
60
+38
| +173% | +$928 |
|
|
ITG
4092
DELISTED
Investment Technology Group Inc
ITG
| $137K | ﹤0.01% |
6,336
+5,004
| +376% | +$109K |
|
|
TERP
4093
PUT
DELISTED
TerraForm Power, Inc
TERP
| $137K | ﹤0.01% |
119
+52
| +78% | +$577 |
|
4094
PUT
Crocs
CROX
$6.75B
| $136K | ﹤0.01% |
64
-161
| -72% | -$3.09K |
|
4095
Gray Television
GTN
$430M
| $136K | ﹤0.01% |
7,806
+1,471
| +23% | +$24.1K |
|
4096
Ingersoll Rand
IR
$33.9B
| $136K | ﹤0.01% |
+4,831
| New | +$135K |
|
4097
PUT
Malibu Boats
MBUU
$559M
| $136K | ﹤0.01% |
25
+7
| +39% | +$311 |
|
4098
ProShares Short QQQ
PSQ
$840M
| $136K | ﹤0.01% |
936
+222
| +31% | +$33.5K |
|
4099
CALL
Telephone and Data Systems
TDS
$3.87B
| $136K | ﹤0.01% |
45
+24
| +114% | +$685 |
|
4100
PUT
Tennant Co
TNC
$1.5B
| $136K | ﹤0.01% |
18
| – | – |
|
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.