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
|
+$83.1M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$37.2M |
| 3 |
Amgen
AMGN
|
+$30.5M |
| 4 |
Micron Technology
MU
|
+$28.8M |
| 5 |
Qualcomm
QCOM
|
+$18.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$29.5M |
| 2 |
Goldman Sachs
GS
|
+$27.8M |
| 3 |
Gilead Sciences
GILD
|
+$27.6M |
| 4 |
Booking.com
BKNG
|
+$25.4M |
| 5 |
AT&T
T
|
+$19.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 13.55% |
| 2 | Communication Services | 11.57% |
| 3 | Consumer Discretionary | 9.69% |
| 4 | Healthcare | 7.28% |
| 5 | Financials | 4.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
TIF
151
DELISTED
Tiffany & Co.
TIF
| $2.38M | 0.1% |
25,317
-34,701
| -58% | -$3.19M |
|
152
The Mosaic Company
MOS
$7.12B
| $2.34M | 0.1% |
+102,373
| New | +$2.51M |
|
153
Mercado Libre
MELI
$92.4B
| $2.33M | 0.1% |
9,276
+8,262
| +815% | +$2.12M |
|
154
Range Resources
RRC
$8.64B
| $2.31M | 0.1% |
99,661
+40,952
| +70% | +$1.03M |
|
155
CALL
JPMorgan Chase
JPM
$901B
| $2.3M | 0.1% |
8,519
+1,488
| +21% | +$128K |
|
|
SGI
156
Somnigroup International
SGI
$14.8B
| $2.28M | 0.1% |
+171,044
| New | +$2.02M |
|
157
CarMax
KMX
$7.93B
| $2.28M | 0.1% |
36,111
-2,759
| -7% | -$167K |
|
|
158
PUT
Micron Technology
MU
$1.1T
| $2.27M | 0.1% |
20,095
+12,712
| +172% | +$372K |
|
159
Bank of America
BAC
$430B
| $2.26M | 0.1% |
93,102
-379,243
| -80% | -$8.84M |
|
|
AMTD
160
DELISTED
TD Ameritrade Holding Corp
AMTD
| $2.25M | 0.1% |
+52,447
| New | +$2.04M |
|
161
SAP
SAP
$180B
| $2.25M | 0.1% |
21,528
-1,746
| -8% | -$180K |
|
162
Adobe
ADBE
$90.3B
| $2.22M | 0.1% |
15,686
-25,304
| -62% | -$3.46M |
|
163
Radware
RDWR
$1.28B
| $2.21M | 0.1% |
126,199
+15,739
| +14% | +$267K |
|
164
iShares MSCI EAFE ETF
EFA
$76.9B
| $2.2M | 0.1% |
+33,734
| New | +$2.18M |
|
165
Newmont
NEM
$98.7B
| $2.17M | 0.09% |
+66,854
| New | +$2.25M |
|
|
GG
166
DELISTED
Goldcorp Inc
GG
| $2.14M | 0.09% |
165,554
-89,393
| -35% | -$1.25M |
|
167
Allstate
ALL
$65.3B
| $2.13M | 0.09% |
24,088
+16,840
| +232% | +$1.43M |
|
168
iShares MSCI South Korea ETF
EWY
$23.1B
| $2.1M | 0.09% |
+31,035
| New | +$2.02M |
|
169
CALL
Intuitive Surgical
ISRG
$124B
| $2.1M | 0.09% |
2,277
+234
| +11% | +$22.5K |
|
170
Lumentum
LITE
$65.2B
| $2.09M | 0.09% |
36,635
-26,463
| -42% | -$1.42M |
|
171
Berkshire Hathaway Class B
BRK.B
$1.06T
| $2.07M | 0.09% |
12,222
-59,293
| -83% | -$9.86M |
|
172
PUT
Costco
COST
$412B
| $2.06M | 0.09% |
5,011
+2,395
| +92% | +$413K |
|
|
173
PUT
Goldman Sachs
GS
$311B
| $2.04M | 0.09% |
5,717
+1,353
| +31% | +$301K |
|
174
CALL
Advanced Micro Devices
AMD
$888B
| $2.04M | 0.09% |
13,986
+1,207
| +9% | +$14.8K |
|
|
TTM
175
DELISTED
Tata Motors Limited
TTM
| $2.03M | 0.09% |
61,419
+39,714
| +183% | +$1.39M |
|
Similar funds
Simplex Trading's Q2 2017 Portfolio in Review
As of Q2 2017, Simplex Trading held 7,527 positions worth $2.3B, down 0.39% from $2.31B the previous quarter. Its ten largest holdings account for 23% of the portfolio.
Simplex Trading withdrew a net $114M in Q2 2017, closing 1,474 positions and reducing 2,320 holdings. Its most notable exit was AT&T, an estimated $19.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 14% of assets, up from 9.7% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amgen worth $32.3M.
- Simplex Trading's largest Q2 2017 buy was Amgen: 187,633 shares worth $32.3M.
- Simplex Trading added most to Amazon in Q2 2017, an estimated $83.1M increase.
- Simplex Trading's biggest Q2 2017 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $29.5M.
- Simplex Trading fully exited AT&T in Q2 2017, selling an estimated $19.6M.
- Simplex Trading's ten largest holdings make up 23% of its $2.3B portfolio in Q2 2017.
- Simplex Trading opened 1,408 new positions and closed 1,474 in Q2 2017.
- Simplex Trading's portfolio value fell 0.39% quarter-over-quarter to $2.3B.
Based on Simplex Trading's 13F filing for Q2 2017, filed 12 Jul 2017.