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 | |
|---|---|---|---|---|---|---|
3951
CALL
B2Gold
BTG
$4.98B
| $10K | ﹤0.01% |
292
+47
| +19% | +$124 |
|
3952
CALL
Coeur Mining
CDE
$15.1B
| $10K | ﹤0.01% |
339
+129
| +61% | +$1.17K |
|
3953
PUT
Cerus
CERS
$575M
| $10K | ﹤0.01% |
185
-38
| -17% | -$122 |
|
3954
CALL
Cognex
CGNX
$9.62B
| $10K | ﹤0.01% |
260
+166
| +177% | +$7.37K |
|
3955
PUT
Compass Minerals
CMP
$1.23B
| $10K | ﹤0.01% |
67
-38
| -36% | -$2.53K |
|
3956
PUT
Canadian National Railway
CNI
$78.5B
| $10K | ﹤0.01% |
178
+133
| +296% | +$10.1K |
|
3957
PUT
Corbus Pharmaceuticals
CRBP
$165M
| $10K | ﹤0.01% |
5
-1
| -17% | -$196 |
|
3958
Carter's
CRI
$1.43B
| $10K | ﹤0.01% |
+120
| New | +$10.6K |
|
3959
PUT
Ceragon Networks
CRNT
$188M
| $10K | ﹤0.01% |
113
+80
| +242% | +$240 |
|
3960
PUT
Constellium
CSTM
$3.76B
| $10K | ﹤0.01% |
62
| – | – |
|
3961
Citi Trends
CTRN
$555M
| $10K | ﹤0.01% |
475
-6,335
| -93% | -$120K |
|
3962
PUT
Darling Ingredients
DAR
$9.32B
| $10K | ﹤0.01% |
103
-8
| -7% | -$124 |
|
3963
PUT
DNOW Inc
DNOW
$2.44B
| $10K | ﹤0.01% |
50
+19
| +61% | +$324 |
|
3964
CALL
Euronet Worldwide
EEFT
$3.19B
| $10K | ﹤0.01% |
47
+19
| +68% | +$1.63K |
|
3965
PUT
HubSpot
HUBS
$12.9B
| $10K | ﹤0.01% |
58
+30
| +107% | +$2.03K |
|
3966
InterContinental Hotels
IHG
$23.8B
| $10K | ﹤0.01% |
172
+71
| +70% | +$4.09K |
|
3967
CALL
Integer Holdings
ITGR
$3.39B
| $10K | ﹤0.01% |
17
-6
| -26% | -$239 |
|
3968
PUT
KLA
KLAC
$222B
| $10K | ﹤0.01% |
860
+80
| +10% | +$799 |
|
3969
PUT
Standard BioTools
LAB
$342M
| $10K | ﹤0.01% |
67
+37
| +123% | +$175 |
|
3970
PUT
LivePerson
LPSN
$22M
| $10K | ﹤0.01% |
+9
| New | +$1.24K |
|
3971
PUT
Live Nation Entertainment
LYV
$42.9B
| $10K | ﹤0.01% |
81
+14
| +21% | +$469 |
|
3972
Pediatrix Medical
MD
$2.2B
| $10K | ﹤0.01% |
+174
| New | +$10.3K |
|
3973
CALL
MSCI
MSCI
$42.4B
| $10K | ﹤0.01% |
119
+32
| +37% | +$3.22K |
|
3974
CALL
MaxLinear
MXL
$5.19B
| $10K | ﹤0.01% |
55
-124
| -69% | -$3.61K |
|
3975
Neurocrine Biosciences
NBIX
$18.2B
| $10K | ﹤0.01% |
+221
| New | +$10.7K |
|
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.