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 | |
|---|---|---|---|---|---|---|
2976
PUT
Assembly Biosciences
ASMB
$506M
| $27K | ﹤0.01% |
7
+1
| +17% | +$282 |
|
2977
CALL
Axalta
AXTA
$7.01B
| $27K | ﹤0.01% |
328
-360
| -52% | -$11.5K |
|
2978
PUT
Barclays
BCS
$94.1B
| $27K | ﹤0.01% |
942
-331
| -26% | -$3.38K |
|
2979
PUT
Conagra Brands
CAG
$7.07B
| $27K | ﹤0.01% |
142
-48
| -25% | -$1.86K |
|
2980
PUT
Crown Castle
CCI
$32.7B
| $27K | ﹤0.01% |
307
-180
| -37% | -$17.7K |
|
2981
Central Garden & Pet Co
CENT
$2.74B
| $27K | ﹤0.01% |
1,085
+1,035
| +2,070% | +$28K |
|
2982
CALL
Church & Dwight Co
CHD
$23.1B
| $27K | ﹤0.01% |
340
-14
| -4% | -$716 |
|
2983
PUT
CME Group
CME
$92.2B
| $27K | ﹤0.01% |
568
-65
| -10% | -$7.77K |
|
2984
CALL
Coherent
COHR
$55.2B
| $27K | ﹤0.01% |
149
-52
| -26% | -$1.68K |
|
|
FISV
2985
CALL
Fiserv Inc
FISV
$27.2B
| $27K | ﹤0.01% |
242
-20
| -8% | -$1.21K |
|
2986
PUT
Fidelity National Information Services
FIS
$21.5B
| $27K | ﹤0.01% |
429
-261
| -38% | -$21.8K |
|
2987
CALL
HDFC Bank
HDB
$119B
| $27K | ﹤0.01% |
648
-64
| -9% | -$1.34K |
|
|
HEES
2988
DELISTED
H&E Equipment Services
HEES
| $27K | ﹤0.01% |
1,340
-1,271
| -49% | -$26.7K |
|
2989
CALL
Inovio Pharmaceuticals
INO
$79.8M
| $27K | ﹤0.01% |
35
+30
| +600% | +$2.57K |
|
2990
CALL
Karyopharm Therapeutics
KPTI
$168M
| $27K | ﹤0.01% |
12
+6
| +100% | +$888 |
|
2991
CALL
LivaNova
LIVN
$4.3B
| $27K | ﹤0.01% |
86
+75
| +682% | +$4.24K |
|
2992
CALL
Mattel
MAT
$4.17B
| $27K | ﹤0.01% |
661
+4
| +0.6% | +$90 |
|
2993
CALL
Pultegroup
PHM
$24.5B
| $27K | ﹤0.01% |
80
-1,120
| -93% | -$26.1K |
|
2994
PUT
Plug Power
PLUG
$2.92B
| $27K | ﹤0.01% |
561
+526
| +1,503% | +$1.1K |
|
2995
Prothena Corp
PRTA
$458M
| $27K | ﹤0.01% |
500
-1,451
| -74% | -$77.3K |
|
2996
CALL
SAP
SAP
$187B
| $27K | ﹤0.01% |
86
+27
| +46% | +$2.78K |
|
|
SJT
2997
San Juan Basin Royalty Trust
SJT
$117M
| $27K | ﹤0.01% |
+4,026
| New | +$29.1K |
|
2998
Televisa
TV
$1.45B
| $27K | ﹤0.01% |
1,123
+122
| +12% | +$3.03K |
|
2999
UDR
UDR
$12.9B
| $27K | ﹤0.01% |
717
-1,244
| -63% | -$47.4K |
|
3000
PUT
United States Natural Gas Fund
UNG
$470M
| $27K | ﹤0.01% |
9
-13
| -59% | -$1.51K |
|
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.