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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1126
CALL
Realty Income
O
$60.4B
| $3.09M | 0.01% |
433
+48
| +12% | +$3.58K |
|
1127
CALL
Encompass Health
EHC
$11B
| $3.09M | 0.01% |
561
+298
| +113% | +$16.2K |
|
1128
CALL
Iron Mountain
IRM
$37.1B
| $3.09M | 0.01% |
969
+320
| +49% | +$10.5K |
|
1129
CALL
AstraZeneca
AZN
$261B
| $3.08M | 0.01% |
309
-20
| -6% | -$1.88K |
|
|
CCXI
1130
CALL
DELISTED
ChemoCentryx, Inc.
CCXI
| $3.08M | 0.01% |
779
+464
| +147% | +$8.15K |
|
1131
CALL
Pool Corp
POOL
$6.68B
| $3.08M | 0.01% |
+145
| New | +$29.9K |
|
|
BPMC
1132
CALL
DELISTED
Blueprint Medicines
BPMC
| $3.08M | 0.01% |
384
+220
| +134% | +$16.5K |
|
|
HOLX
1133
PUT
DELISTED
Hologic
HOLX
| $3.08M | 0.01% |
589
+552
| +1,492% | +$27.5K |
|
1134
Sony
SONY
$122B
| $3.07M | 0.01% |
+225,930
| New | +$2.82M |
|
1135
CALL
US Foods
USFD
$21B
| $3.06M | 0.01% |
731
+391
| +115% | +$15.7K |
|
1136
CALL
Arthur J. Gallagher & Co
AJG
$62.2B
| $3.06M | 0.01% |
321
+294
| +1,089% | +$26.9K |
|
|
AMTD
1137
PUT
DELISTED
TD Ameritrade Holding Corp
AMTD
| $3.06M | 0.01% |
615
+405
| +193% | +$17.6K |
|
1138
CALL
Canadian Natural Resources
CNQ
$98B
| $3.05M | 0.01% |
1,928
-408
| -17% | -$5.54K |
|
1139
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $3.05M | 0.01% |
402
+132
| +49% | +$10.2K |
|
1140
CALL
CF Industries
CF
$19.5B
| $3.04M | 0.01% |
638
-21
| -3% | -$983 |
|
1141
PUT
Stellantis
STLA
$16.7B
| $3.04M | 0.01% |
2,071
+731
| +55% | +$10.6K |
|
|
CMD
1142
CALL
DELISTED
Cantel Medical Corporation
CMD
| $3.04M | 0.01% |
429
+427
| +21,350% | +$31K |
|
1143
CALL
Check Point Software Technologies
CHKP
$12.9B
| $3.04M | 0.01% |
274
-254
| -48% | -$28.5K |
|
|
WCG
1144
PUT
DELISTED
Wellcare Health Plans, Inc.
WCG
| $3.04M | 0.01% |
92
+9
| +11% | +$2.7K |
|
1145
CALL
Edison International
EIX
$30.6B
| $3.03M | 0.01% |
402
+343
| +581% | +$24.3K |
|
1146
PUT
Ollie's Bargain Outlet
OLLI
$3.94B
| $3.03M | 0.01% |
464
+398
| +603% | +$25.2K |
|
1147
CALL
Corning
GLW
$134B
| $3.03M | 0.01% |
1,040
-1,603
| -61% | -$46.5K |
|
1148
CALL
Generac Holdings
GNRC
$12.4B
| $3.03M | 0.01% |
301
+4
| +1% | +$372 |
|
1149
PUT
Intercontinental Exchange
ICE
$81B
| $3.03M | 0.01% |
327
-508
| -61% | -$47.1K |
|
1150
PUT
HP
HPQ
$22.4B
| $3.02M | 0.01% |
1,470
+83
| +6% | +$1.57K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.