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 | |
|---|---|---|---|---|---|---|
4551
CALL
Broadridge
BR
$18.4B
| $5K | ﹤0.01% |
+21
| New | +$1.52K |
|
4552
CALL
Beazer Homes USA
BZH
$888M
| $5K | ﹤0.01% |
36
-52
| -59% | -$673 |
|
4553
PUT
China Automotive Systems
CAAS
$131M
| $5K | ﹤0.01% |
+194
| New | +$942 |
|
4554
CALL
CACI
CACI
$10.8B
| $5K | ﹤0.01% |
+34
| New | +$4.13K |
|
4555
CALL
Community Bank
CBU
$3.39B
| $5K | ﹤0.01% |
37
-144
| -80% | -$7.97K |
|
4556
PUT
Celanese
CE
$4.82B
| $5K | ﹤0.01% |
142
+62
| +78% | +$5.52K |
|
4557
PUT
CEVA Inc
CEVA
$831M
| $5K | ﹤0.01% |
+45
| New | +$1.85K |
|
4558
CALL
Coherus Oncology
CHRS
$217M
| $5K | ﹤0.01% |
143
+121
| +550% | +$2.33K |
|
4559
CEMIG Preferred Shares
CIG
$6.06B
| $5K | ﹤0.01% |
4,873
+1,505
| +45% | +$1.99K |
|
|
CIO
4560
PUT
DELISTED
City Office REIT
CIO
| $5K | ﹤0.01% |
50
-6
| -11% | -$75 |
|
4561
PUT
Columbia Sportswear
COLM
$3.25B
| $5K | ﹤0.01% |
26
-176
| -87% | -$9.95K |
|
4562
CALL
Comstock Resources
CRK
$3.7B
| $5K | ﹤0.01% |
153
-239
| -61% | -$1.9K |
|
4563
PUT
Digital Realty Trust
DLR
$69.6B
| $5K | ﹤0.01% |
63
-48
| -43% | -$5.49K |
|
4564
CALL
Digimarc Corp
DMRC
$143M
| $5K | ﹤0.01% |
5
-7
| -58% | -$226 |
|
|
DX
4565
Dynex Capital
DX
$3.18B
| $5K | ﹤0.01% |
279
-35
| -11% | -$731 |
|
4566
CALL
DexCom
DXCM
$29B
| $5K | ﹤0.01% |
188
-332
| -64% | -$6.13K |
|
4567
ProShares UltraShort Dow 30
DXD
$43.6M
| $5K | ﹤0.01% |
+21
| New | +$5.19K |
|
4568
CALL
Brinker International
EAT
$8.82B
| $5K | ﹤0.01% |
138
+121
| +712% | +$5.03K |
|
4569
Energy Focus
EFOI
$18M
| $5K | ﹤0.01% |
63
-207
| -77% | -$21.9K |
|
|
4570
PUT
Energy Focus
EFOI
$18M
| $5K | ﹤0.01% |
1
-2
| -67% | -$212 |
|
4571
Evolution Petroleum
EPM
$133M
| $5K | ﹤0.01% |
684
-10,074
| -94% | -$78.6K |
|
4572
CALL
Fortress Biotech
FBIO
$111M
| $5K | ﹤0.01% |
7
+5
| +250% | +$295 |
|
4573
PUT
Globant
GLOB
$1.65B
| $5K | ﹤0.01% |
33
-61
| -65% | -$2.36K |
|
4574
CALL
Global Net Lease
GNL
$1.87B
| $5K | ﹤0.01% |
291
+58
| +25% | +$1.33K |
|
4575
Globalstar
GSAT
$10.1B
| $5K | ﹤0.01% |
161
-1,308
| -89% | -$39.4K |
|
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.