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 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
151
CALL
FedEx
FDX
$73.1B
| $2.61M | 0.11% |
1,086
-333
| -23% | -$76.2K |
|
152
Alkermes
ALKS
$8.62B
| $2.59M | 0.11% |
47,300
+39,737
| +525% | +$2.03M |
|
153
State Street Utilities Select Sector SPDR ETF
XLU
$23.3B
| $2.57M | 0.11% |
97,746
+85,680
| +710% | +$2.35M |
|
154
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $2.57M | 0.11% |
12,058
+2,059
| +21% | +$172K |
|
|
155
CALL
Citigroup
C
$223B
| $2.56M | 0.11% |
6,225
-5,394
| -46% | -$399K |
|
156
CALL
SPDR Gold Trust
GLD
$132B
| $2.5M | 0.11% |
9,654
+2,497
| +35% | +$303K |
|
157
Mettler-Toledo International
MTD
$25.7B
| $2.48M | 0.11% |
4,002
+882
| +28% | +$564K |
|
158
Dollar Tree
DLTR
$24.3B
| $2.47M | 0.11% |
+23,006
| New | +$2.25M |
|
159
PUT
Chipotle Mexican Grill
CMG
$42.7B
| $2.46M | 0.11% |
144,650
-5,100
| -3% | -$30.4K |
|
160
PUT
Under Armour Class C
UA
$3.04B
| $2.43M | 0.1% |
2,741
-720
| -21% | -$9.43K |
|
161
PepsiCo
PEP
$184B
| $2.41M | 0.1% |
20,127
-73,240
| -78% | -$8.36M |
|
162
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $2.41M | 0.1% |
17,353
+3,487
| +25% | +$79.6K |
|
|
AGN
163
CALL
DELISTED
Allergan plc
AGN
| $2.41M | 0.1% |
3,072
-70
| -2% | -$12.6K |
|
164
Intuit
INTU
$79.3B
| $2.4M | 0.1% |
+15,226
| New | +$2.32M |
|
165
Oracle
ORCL
$366B
| $2.37M | 0.1% |
50,217
-120,080
| -71% | -$5.89M |
|
166
CALL
Universal Display
OLED
$3.81B
| $2.35M | 0.1% |
1,290
+768
| +147% | +$122K |
|
167
Ford
F
$56.9B
| $2.34M | 0.1% |
187,580
+85,527
| +84% | +$1.05M |
|
168
CALL
Adobe
ADBE
$90.3B
| $2.34M | 0.1% |
1,762
+162
| +10% | +$27.9K |
|
169
Aptiv
APTV
$12.1B
| $2.33M | 0.1% |
27,439
-6,619
| -19% | -$630K |
|
170
Automatic Data Processing
ADP
$102B
| $2.3M | 0.1% |
19,651
+16,874
| +608% | +$1.93M |
|
171
VanEck Gold Miners ETF
GDX
$22.7B
| $2.28M | 0.1% |
97,976
+9,814
| +11% | +$223K |
|
172
Medtronic
MDT
$107B
| $2.27M | 0.1% |
28,129
+1,712
| +6% | +$137K |
|
173
PUT
Broadcom
AVGO
$1.84T
| $2.25M | 0.1% |
24,800
+1,140
| +5% | +$29.6K |
|
174
ASML
ASML
$692B
| $2.25M | 0.1% |
12,920
-2,025
| -14% | -$357K |
|
|
WUBA
175
DELISTED
58.com Inc
WUBA
| $2.24M | 0.1% |
+31,330
| New | +$2.17M |
|
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 $315M 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 Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
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.