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 | |
|---|---|---|---|---|---|---|
151
Zimmer Biomet
ZBH
$17.4B
| $2.5M | 0.1% |
21,967
+13,089
| +147% | +$1.51M |
|
152
Biogen
BIIB
$29.5B
| $2.47M | 0.1% |
+7,879
| New | +$2.33M |
|
153
Delta Air Lines
DAL
$55.7B
| $2.46M | 0.1% |
51,057
-23,440
| -31% | -$1.17M |
|
154
CALL
Home Depot
HD
$332B
| $2.45M | 0.1% |
3,782
+1,628
| +76% | +$250K |
|
|
KYNB
155
Kyntra Bio
KYNB
$28.5M
| $2.42M | 0.1% |
1,803
+654
| +57% | +$689K |
|
156
AT&T
T
$155B
| $2.42M | 0.1% |
+81,633
| New | +$2.32M |
|
|
AABA
157
CALL
DELISTED
Altaba Inc
AABA
| $2.41M | 0.1% |
7,043
+5,812
| +472% | +$357K |
|
158
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $2.4M | 0.1% |
9,999
-4,218
| -30% | -$322K |
|
|
159
CALL
Amgen
AMGN
$198B
| $2.37M | 0.1% |
3,156
+541
| +21% | +$95.9K |
|
160
Domino's
DPZ
$10.9B
| $2.37M | 0.1% |
11,933
+3,304
| +38% | +$643K |
|
161
PUT
Walt Disney
DIS
$167B
| $2.36M | 0.1% |
8,644
+574
| +7% | +$59K |
|
|
STRP
162
DELISTED
Straight Path Communications Inc.
STRP
| $2.36M | 0.1% |
13,081
+12,266
| +1,505% | +$2.2M |
|
163
CALL
Applied Materials
AMAT
$448B
| $2.33M | 0.1% |
3,519
+1,307
| +59% | +$59.1K |
|
164
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $2.32M | 0.09% |
7,567
-4,882
| -39% | -$110K |
|
165
US Bancorp
USB
$98.4B
| $2.32M | 0.09% |
+43,269
| New | +$2.26M |
|
166
VanEck Junior Gold Miners ETF
GDXJ
$7.01B
| $2.28M | 0.09% |
+67,918
| New | +$2.3M |
|
|
KITE
167
CALL
DELISTED
Kite Pharma, Inc.
KITE
| $2.28M | 0.09% |
2,145
+1,726
| +412% | +$240K |
|
|
CLVS
168
DELISTED
Clovis Oncology, Inc.
CLVS
| $2.26M | 0.09% |
27,403
+23,373
| +580% | +$1.85M |
|
|
EVHC
169
DELISTED
Envision Healthcare Holdings Inc
EVHC
| $2.24M | 0.09% |
49,936
+46,743
| +1,464% | +$2.49M |
|
170
NRG Energy
NRG
$27.8B
| $2.23M | 0.09% |
87,067
+32,589
| +60% | +$771K |
|
|
LSI
171
DELISTED
Life Storage, Inc.
LSI
| $2.21M | 0.09% |
40,449
+15,706
| +63% | +$788K |
|
172
Bank of America
BAC
$430B
| $2.19M | 0.09% |
86,439
-6,663
| -7% | -$162K |
|
173
AutoZone
AZO
$48.9B
| $2.19M | 0.09% |
3,674
+3,130
| +575% | +$1.67M |
|
174
BlackBerry
BB
$5.27B
| $2.18M | 0.09% |
194,959
+52,515
| +37% | +$494K |
|
175
Microsoft
MSFT
$2.95T
| $2.16M | 0.09% |
29,058
-192,135
| -87% | -$14M |
|
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.