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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 43.55% |
| 2 | Consumer Discretionary | 11.51% |
| 3 | Technology | 10.85% |
| 4 | Healthcare | 7.35% |
| 5 | Communication Services | 7.27% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
226
Thermo Fisher Scientific
TMO
$227B
| $1.68M | 0.07% |
+8,853
| New | +$1.7M |
|
227
CALL
Biogen
BIIB
$32.6B
| $1.68M | 0.07% |
908
-407
| -31% | -$131K |
|
228
PUT
Roku
ROKU
$23.1B
| $1.68M | 0.07% |
+6,338
| New | +$218K |
|
229
McKesson
MCK
$106B
| $1.68M | 0.07% |
+10,760
| New | +$1.59M |
|
230
Papa John's
PZZA
$747M
| $1.68M | 0.07% |
29,873
+27,539
| +1,180% | +$1.71M |
|
231
Marriott International
MAR
$87.8B
| $1.67M | 0.07% |
12,310
-15,255
| -55% | -$1.87M |
|
232
United Parcel Service
UPS
$87B
| $1.66M | 0.07% |
+13,957
| New | +$1.64M |
|
|
X
233
CALL
DELISTED
US Steel
X
| $1.66M | 0.07% |
3,316
-107
| -3% | -$3.11K |
|
234
Vanguard Morningstar Total Stock Market ETF
VTI
$693B
| $1.66M | 0.07% |
+12,088
| New | +$1.62M |
|
235
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $1.65M | 0.07% |
9,151
+1,584
| +21% | +$36.2K |
|
|
SHPG
236
DELISTED
Shire pic
SHPG
| $1.64M | 0.07% |
10,599
+323
| +3% | +$47.9K |
|
237
Dollar General
DG
$29.4B
| $1.64M | 0.07% |
+17,632
| New | +$1.52M |
|
238
CALL
Synchrony
SYF
$26B
| $1.63M | 0.07% |
3,125
+1,847
| +145% | +$63.2K |
|
239
Philip Morris
PM
$284B
| $1.63M | 0.07% |
+15,417
| New | +$1.64M |
|
240
Lennar Class A
LEN
$20.1B
| $1.62M | 0.07% |
26,485
+25,302
| +2,139% | +$1.44M |
|
241
Teradyne
TER
$55.8B
| $1.61M | 0.07% |
38,473
+13,849
| +56% | +$571K |
|
|
AAAP
242
DELISTED
Advanced Accelerator Applications S.A.
AAAP
| $1.6M | 0.07% |
+19,571
| New | +$1.52M |
|
243
CALL
Chevron
CVX
$409B
| $1.6M | 0.07% |
2,657
+1,100
| +71% | +$130K |
|
244
Wendy's
WEN
$1.53B
| $1.59M | 0.07% |
+96,835
| New | +$1.47M |
|
245
CALL
Phillips 66
PSX
$102B
| $1.59M | 0.07% |
1,375
-115
| -8% | -$10.9K |
|
246
Everest Group
EG
$14.6B
| $1.59M | 0.07% |
7,180
+1,225
| +21% | +$276K |
|
247
CALL
Broadcom
AVGO
$1.7T
| $1.58M | 0.07% |
14,140
-1,160
| -8% | -$30.2K |
|
248
Veeva Systems
VEEV
$44.5B
| $1.57M | 0.07% |
28,403
+26,199
| +1,189% | +$1.54M |
|
249
Hartford Financial Services
HIG
$37.5B
| $1.56M | 0.07% |
27,751
+24,316
| +708% | +$1.36M |
|
250
PUT
State Street SPDR NYSE Technology ETF
XNTK
$1.9B
| $1.56M | 0.07% |
19,451
+7,917
| +69% | +$660K |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $313M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Miscellaneous at 44% of assets, up from 40% a quarter earlier, followed by Consumer Discretionary and Technology.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.