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 | |
|---|---|---|---|---|---|---|
3501
Kroger
KR
$35.5B
| $229K | ﹤0.01% |
+7,876
| New | +$234K |
|
|
CALA
3502
CALL
DELISTED
Calithera Biosciences, Inc
CALA
| $229K | ﹤0.01% |
22
+18
| +450% | +$1.71K |
|
|
EGOV
3503
PUT
DELISTED
NIC Inc
EGOV
| $229K | ﹤0.01% |
155
-63
| -29% | -$1.02K |
|
3504
Cimpress
CMPR
$2.41B
| $228K | ﹤0.01% |
1,671
-3,235
| -66% | -$467K |
|
3505
PUT
GrafTech
EAF
$203M
| $228K | ﹤0.01% |
+12
| New | +$2.26K |
|
3506
CALL
GeoPark
GPRK
$615M
| $228K | ﹤0.01% |
+112
| New | +$2.13K |
|
3507
CALL
Leidos
LDOS
$14.5B
| $228K | ﹤0.01% |
33
+7
| +27% | +$475 |
|
3508
PUT
QuidelOrtho
QDEL
$1.15B
| $228K | ﹤0.01% |
35
+30
| +600% | +$2.1K |
|
|
UCTT
3509
CALL
Ultra Clean Holdings
UCTT
$3.9B
| $228K | ﹤0.01% |
182
-92
| -34% | -$1.34K |
|
|
USG
3510
DELISTED
Usg
USG
| $228K | ﹤0.01% |
+5,284
| New | +$228K |
|
3511
CALL
Calumet Specialty Products
CLMT
$3.6B
| $227K | ﹤0.01% |
356
-23
| -6% | -$163 |
|
3512
CALL
Conduent
CNDT
$234M
| $227K | ﹤0.01% |
101
+79
| +359% | +$1.62K |
|
3513
CALL
LGI Homes
LGIH
$1.4B
| $227K | ﹤0.01% |
48
+26
| +118% | +$1.43K |
|
|
FOLD
3514
PUT
DELISTED
Amicus Therapeutics
FOLD
| $226K | ﹤0.01% |
187
-569
| -75% | -$7.96K |
|
3515
PUT
Groupon
GRPN
$1.05B
| $226K | ﹤0.01% |
30
+19
| +173% | +$1.67K |
|
3516
Ares Capital
ARCC
$13.6B
| $225K | ﹤0.01% |
+13,102
| New | +$225K |
|
3517
CALL
CryoPort
CYRX
$764M
| $225K | ﹤0.01% |
176
-82
| -32% | -$1.17K |
|
3518
CALL
eGain
EGAN
$187M
| $225K | ﹤0.01% |
278
+186
| +202% | +$2.35K |
|
3519
PUT
Funko
FNKO
$342M
| $225K | ﹤0.01% |
95
+90
| +1,800% | +$1.81K |
|
3520
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.82B
| $225K | ﹤0.01% |
+7,144
| New | +$229K |
|
3521
PUT
Magna International
MGA
$18.3B
| $225K | ﹤0.01% |
43
+8
| +23% | +$449 |
|
3522
PUT
W.P. Carey
WPC
$17B
| $225K | ﹤0.01% |
36
+11
| +44% | +$708 |
|
|
WEB
3523
PUT
DELISTED
Web.com Group, Inc.
WEB
| $225K | ﹤0.01% |
81
+80
| +8,000% | +$2.16K |
|
3524
PUT
Corcept Therapeutics
CORT
$9.78B
| $224K | ﹤0.01% |
160
-19
| -11% | -$266 |
|
3525
PUT
Flowserve
FLS
$9.29B
| $224K | ﹤0.01% |
41
+33
| +413% | +$1.6K |
|
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.