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 | |
|---|---|---|---|---|---|---|
2101
PUT
LPL Financial
LPLA
$26.3B
| $68K | ﹤0.01% |
272
-41
| -13% | -$1.66K |
|
2102
Opko Health
OPK
$921M
| $68K | ﹤0.01% |
10,422
+9,268
| +803% | +$65K |
|
2103
ProShares UltraShort Financials
SKF
$10.5M
| $68K | ﹤0.01% |
162
+160
| +8,000% | +$72.3K |
|
|
ACIA
2104
CALL
DELISTED
Acacia Communications Inc
ACIA
| $68K | ﹤0.01% |
342
-309
| -47% | -$14.9K |
|
|
NSH
2105
DELISTED
NuStar GP Holdings LLC
NSH
| $68K | ﹤0.01% |
+2,792
| New | +$72.2K |
|
2106
American Eagle Outfitters
AEO
$2.85B
| $67K | ﹤0.01% |
5,615
-3,539
| -39% | -$44.4K |
|
2107
Chegg
CHGG
$108M
| $67K | ﹤0.01% |
5,461
+2,952
| +118% | +$32.1K |
|
2108
CALL
Canadian Pacific Kansas City
CP
$82B
| $67K | ﹤0.01% |
560
-385
| -41% | -$11.9K |
|
2109
Ducommun
DCO
$2.68B
| $67K | ﹤0.01% |
+2,143
| New | +$66.6K |
|
2110
PUT
Dycom Industries
DY
$12.9B
| $67K | ﹤0.01% |
199
-211
| -51% | -$20.5K |
|
2111
PUT
Northrop Grumman
NOC
$77B
| $67K | ﹤0.01% |
266
-216
| -45% | -$54K |
|
2112
Paycom
PAYC
$6.78B
| $67K | ﹤0.01% |
+980
| New | +$63K |
|
2113
CALL
PTC Therapeutics
PTCT
$6.37B
| $67K | ﹤0.01% |
200
-380
| -66% | -$5.12K |
|
2114
Direxion Daily Technology Bear 3x ETF
TECS
$78.2M
| – | – |
0
| – | – |
|
|
NM
2115
DELISTED
Navios Maritime Holdings Inc.
NM
| $67K | ﹤0.01% |
4,936
+2,424
| +96% | +$35.5K |
|
|
CZR
2116
PUT
DELISTED
Caesars Entertainment Corporation
CZR
| $67K | ﹤0.01% |
957
-82
| -8% | -$916 |
|
2117
AllianceBernstein
AB
$3.47B
| $66K | ﹤0.01% |
2,800
-2,678
| -49% | -$60K |
|
2118
Booz Allen Hamilton
BAH
$8.7B
| $66K | ﹤0.01% |
2,050
+1,714
| +510% | +$61.6K |
|
2119
Columbus McKinnon
CMCO
$465M
| $66K | ﹤0.01% |
2,616
+2,308
| +749% | +$59.8K |
|
2120
CALL
Ecolab
ECL
$75.6B
| $66K | ﹤0.01% |
180
+111
| +161% | +$14.3K |
|
2121
iShares MSCI Canada ETF
EWC
$6.04B
| $66K | ﹤0.01% |
2,487
-2,019
| -45% | -$53.4K |
|
2122
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $66K | ﹤0.01% |
1,331
+473
| +55% | +$10.3K |
|
2123
SolarEdge
SEDG
$2.59B
| $66K | ﹤0.01% |
+3,325
| New | +$58.9K |
|
|
SNBR
2124
PUT
DELISTED
Sleep Number
SNBR
| $66K | ﹤0.01% |
649
+611
| +1,608% | +$18.3K |
|
2125
Telecom Argentina
TEO
$5.89B
| $66K | ﹤0.01% |
+2,631
| New | +$63.4K |
|
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.