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 | |
|---|---|---|---|---|---|---|
1151
PUT
Gen Digital
GEN
$15.1B
| $240K | 0.01% |
1,407
+668
| +90% | +$20K |
|
1152
Rambus
RMBS
$11.2B
| $240K | 0.01% |
+16,884
| New | +$243K |
|
1153
CALL
CVS Health
CVS
$136B
| $238K | 0.01% |
2,349
-225
| -9% | -$16.4K |
|
1154
PUT
Trade Desk
TTD
$7.89B
| $238K | 0.01% |
1,660
-950
| -36% | -$5.25K |
|
|
PX
1155
CALL
DELISTED
Praxair Inc
PX
| $238K | 0.01% |
604
+440
| +268% | +$65.3K |
|
1156
InfraCap MLP ETF
AMZA
$469M
| $237K | 0.01% |
2,762
+2,329
| +538% | +$196K |
|
1157
CALL
Domino's
DPZ
$10.7B
| $237K | 0.01% |
206
-84
| -29% | -$15.6K |
|
1158
KeyCorp
KEY
$24.4B
| $237K | 0.01% |
+11,775
| New | +$222K |
|
1159
CALL
Medtronic
MDT
$105B
| $237K | 0.01% |
1,775
+431
| +32% | +$34.5K |
|
1160
PUT
NOV
NOV
$7.22B
| $237K | 0.01% |
313
-283
| -47% | -$9.57K |
|
|
MTOR
1161
PUT
DELISTED
MERITOR, Inc.
MTOR
| $237K | 0.01% |
+677
| New | +$17K |
|
|
CXO
1162
CALL
DELISTED
CONCHO RESOURCES INC.
CXO
| $237K | 0.01% |
390
+129
| +49% | +$17.9K |
|
|
VAR
1163
DELISTED
Varian Medical Systems, Inc.
VAR
| $236K | 0.01% |
+2,131
| New | +$229K |
|
|
MON
1164
CALL
DELISTED
Monsanto Co
MON
| $236K | 0.01% |
1,825
-51
| -3% | -$6.07K |
|
1165
PUT
ConocoPhillips
COP
$146B
| $235K | 0.01% |
3,476
-200
| -5% | -$10.3K |
|
1166
CALL
ProShares UltraShort Industrials
SIJ
$5.78M
| $235K | 0.01% |
298
+68
| +30% | +$19.7K |
|
1167
CALL
Lennar Class B
LEN.B
$19.4B
| $234K | 0.01% |
162
+24
| +17% | +$1.11K |
|
1168
PUT
Seagate
STX
$207B
| $234K | 0.01% |
2,279
-369
| -14% | -$14.1K |
|
1169
Generac Holdings
GNRC
$12.4B
| $233K | 0.01% |
+4,717
| New | +$234K |
|
|
HTT
1170
PUT
High Templar Tech Ltd
HTT
$390M
| $233K | 0.01% |
+467
| New | +$9K |
|
1171
CALL
Devon Energy
DVN
$52.2B
| $231K | 0.01% |
910
-591
| -39% | -$22.4K |
|
1172
Dr. Reddy's Laboratories
RDY
$9.83B
| $231K | 0.01% |
30,860
-2,375
| -7% | -$17.1K |
|
1173
CALL
Stratasys
SSYS
$695M
| $231K | 0.01% |
453
+11
| +2% | +$240 |
|
|
1174
CALL
Seagate
STX
$207B
| $231K | 0.01% |
1,189
-2,277
| -66% | -$87K |
|
|
STAY
1175
DELISTED
Extended Stay America, Inc. Paired Share Unit
STAY
| $231K | 0.01% |
12,189
+2,099
| +21% | +$39.1K |
|
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.