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
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4101
PUT
Macerich
MAC
$7.4B
| $7K | ﹤0.01% |
79
-103
| -57% | -$5.77K |
|
|
MASI
4102
CALL
DELISTED
Masimo
MASI
| $7K | ﹤0.01% |
24
-70
| -74% | -$6.19K |
|
4103
M/I Homes
MHO
$3.95B
| $7K | ﹤0.01% |
+276
| New | +$7.15K |
|
4104
PUT
MSC Industrial Direct
MSM
$6.76B
| $7K | ﹤0.01% |
+210
| New | +$15.2K |
|
4105
CALL
Myers Industries
MYE
$1.24B
| $7K | ﹤0.01% |
+9
| New | +$165 |
|
4106
NovaGold Resources
NG
$2.54B
| $7K | ﹤0.01% |
1,756
-6,743
| -79% | -$29.1K |
|
4107
CALL
NGL Energy Partners
NGL
$1.94B
| $7K | ﹤0.01% |
218
-290
| -57% | -$3.21K |
|
4108
CALL
National Healthcare
NHC
$3.57B
| $7K | ﹤0.01% |
343
| – | – |
|
4109
CALL
Navigator Holdings
NVGS
$1.35B
| $7K | ﹤0.01% |
69
+5
| +8% | +$52 |
|
4110
Onto Innovation
ONTO
$10.9B
| $7K | ﹤0.01% |
+276
| New | +$7.26K |
|
4111
CALL
Palisade Bio
PALI
$341M
| – | – |
0
| – | – |
|
4112
Paycom
PAYC
$7.88B
| $7K | ﹤0.01% |
105
-875
| -89% | -$62.7K |
|
4113
CALL
Pitney Bowes
PBI
$2.39B
| $7K | ﹤0.01% |
117
+52
| +80% | +$714 |
|
4114
PUT
Progressive
PGR
$128B
| $7K | ﹤0.01% |
321
+127
| +65% | +$5.94K |
|
4115
POSCO
PKX
$14.7B
| $7K | ﹤0.01% |
115
-379
| -77% | -$27.2K |
|
|
PNNT
4116
Pennant Park Investment Corp
PNNT
$220M
| $7K | ﹤0.01% |
+1,060
| New | +$7.97K |
|
|
PPL
4117
CALL
PPL Corp
PPL
$26.9B
| $7K | ﹤0.01% |
355
+39
| +12% | +$1.51K |
|
4118
CALL
Quad
QUAD
$479M
| $7K | ﹤0.01% |
90
+35
| +64% | +$724 |
|
4119
PUT
RPM International
RPM
$13.8B
| $7K | ﹤0.01% |
+38
| New | +$1.95K |
|
4120
PUT
Red Robin
RRGB
$139M
| $7K | ﹤0.01% |
31
-29
| -48% | -$1.76K |
|
4121
CALL
Saic
SAIC
$4.95B
| $7K | ﹤0.01% |
+8
| New | +$555 |
|
4122
CALL
Tanger
SKT
$4.78B
| $7K | ﹤0.01% |
390
+60
| +18% | +$1.52K |
|
4123
CALL
Snap-on
SNA
$21.5B
| $7K | ﹤0.01% |
27
-44
| -62% | -$6.61K |
|
|
SNBR
4124
PUT
DELISTED
Sleep Number
SNBR
| $7K | ﹤0.01% |
91
-558
| -86% | -$17.4K |
|
4125
PUT
Sony
SONY
$137B
| $7K | ﹤0.01% |
160
-345
| -68% | -$2.7K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.