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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2026
PUT
Planet Fitness
PLNT
$4.23B
| $627K | ﹤0.01% |
117
-282
| -71% | -$14.5K |
|
2027
PUT
Repligen
RGEN
$7.44B
| $627K | ﹤0.01% |
119
+79
| +198% | +$4.63K |
|
|
PFPT
2028
DELISTED
Proofpoint, Inc.
PFPT
| $627K | ﹤0.01% |
7,482
+4,344
| +138% | +$402K |
|
|
ACB
2029
CALL
Aurora Cannabis
ACB
$165M
| $625K | ﹤0.01% |
+11
| New | +$8.11K |
|
2030
GrafTech
EAF
$194M
| $624K | ﹤0.01% |
5,459
+1,782
| +48% | +$272K |
|
|
FNSR
2031
PUT
DELISTED
Finisar Corp
FNSR
| $624K | ﹤0.01% |
289
-873
| -75% | -$17.4K |
|
2032
PUT
AMN Healthcare
AMN
$1.28B
| $623K | ﹤0.01% |
110
+108
| +5,400% | +$6.06K |
|
2033
KraneShares CSI China Internet ETF
KWEB
$5.2B
| $623K | ﹤0.01% |
16,625
+15,332
| +1,186% | +$648K |
|
2034
PUT
Copa Holdings
CPA
$5.56B
| $621K | ﹤0.01% |
79
+55
| +229% | +$4.31K |
|
2035
PUT
LivaNova
LIVN
$4.3B
| $621K | ﹤0.01% |
68
-11
| -14% | -$1.18K |
|
2036
CALL
LGI Homes
LGIH
$1.4B
| $619K | ﹤0.01% |
137
+89
| +185% | +$3.76K |
|
|
VNE
2037
CALL
DELISTED
Veoneer, Inc.
VNE
| $617K | ﹤0.01% |
262
+254
| +3,175% | +$8.93K |
|
2038
AstraZeneca
AZN
$263B
| $616K | ﹤0.01% |
8,118
-3,203
| -28% | -$250K |
|
2039
PUT
Hewlett Packard
HPE
$63.2B
| $616K | ﹤0.01% |
484
+132
| +38% | +$1.98K |
|
|
HA
2040
PUT
DELISTED
Hawaiian Holdings, Inc.
HA
| $615K | ﹤0.01% |
233
+186
| +396% | +$6.3K |
|
2041
CALL
W.P. Carey
WPC
$17.1B
| $614K | ﹤0.01% |
96
+75
| +357% | +$4.88K |
|
|
TWNK
2042
CALL
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $613K | ﹤0.01% |
561
-345
| -38% | -$3.79K |
|
2043
CALL
Watsco Inc
WSO
$14.9B
| $612K | ﹤0.01% |
44
+43
| +4,300% | +$6.55K |
|
2044
Southwest Airlines
LUV
$22.1B
| $611K | ﹤0.01% |
+13,146
| New | +$698K |
|
|
ARNA
2045
PUT
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $611K | ﹤0.01% |
157
-18
| -10% | -$707 |
|
2046
Vanguard Real Estate ETF
VNQ
$39.9B
| $610K | ﹤0.01% |
+8,183
| New | +$645K |
|
|
DCH
2047
PUT
Dauch Corp
DCH
$1.3B
| $609K | ﹤0.01% |
549
+341
| +164% | +$4.56K |
|
2048
CALL
QuinStreet
QNST
$870M
| $608K | ﹤0.01% |
375
+309
| +468% | +$4.65K |
|
|
KANG
2049
CALL
DELISTED
iKang Healthcare Group, Inc.
KANG
| $607K | ﹤0.01% |
298
+19
| +7% | +$338 |
|
2050
Credit Acceptance
CACC
$6B
| $606K | ﹤0.01% |
1,590
+1,121
| +239% | +$452K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.