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 | |
|---|---|---|---|---|---|---|
151
CALL
FedEx
FDX
$76.2B
| $37.7M | 0.08% |
2,493
+615
| +33% | +$94.8K |
|
|
152
Tesla
TSLA
$1.42T
| $37.5M | 0.08% |
1,344,840
+1,290,795
| +2,388% | +$28M |
|
153
CALL
Goldman Sachs
GS
$324B
| $36.9M | 0.08% |
1,603
-70
| -4% | -$15.2K |
|
154
PUT
American Express
AXP
$237B
| $36.6M | 0.08% |
2,942
+241
| +9% | +$28.8K |
|
155
PUT
ExxonMobil
XOM
$638B
| $36.6M | 0.08% |
5,242
+1,267
| +32% | +$87.6K |
|
|
TWTR
156
PUT
DELISTED
Twitter, Inc.
TWTR
| $36.5M | 0.08% |
11,391
+4,117
| +57% | +$135K |
|
157
CALL
Chevron
CVX
$384B
| $36.5M | 0.08% |
3,026
-1,200
| -28% | -$141K |
|
158
CALL
Trade Desk
TTD
$8.41B
| $36.4M | 0.08% |
14,010
+2,800
| +25% | +$63K |
|
159
CALL
Gilead Sciences
GILD
$164B
| $36M | 0.08% |
5,536
+1,415
| +34% | +$92.1K |
|
160
CALL
Caterpillar
CAT
$412B
| $35.8M | 0.08% |
2,421
-651
| -21% | -$90.8K |
|
161
CALL
Marathon Petroleum
MPC
$94.5B
| $35.3M | 0.08% |
5,857
-1,336
| -19% | -$83.6K |
|
162
PUT
Regeneron Pharmaceuticals
REGN
$70.3B
| $35.2M | 0.08% |
938
+371
| +65% | +$125K |
|
163
PUT
United Parcel Service
UPS
$99.6B
| $35.2M | 0.08% |
3,007
+648
| +27% | +$76.7K |
|
164
Netflix
NFLX
$293B
| $35M | 0.08% |
1,082,190
+239,710
| +28% | +$7.11M |
|
165
PUT
Elevance Health
ELV
$85.6B
| $34.8M | 0.08% |
1,151
+405
| +54% | +$111K |
|
166
PUT
Royal Caribbean
RCL
$77.2B
| $34.6M | 0.08% |
2,594
+1,571
| +154% | +$183K |
|
|
167
CALL
Elevance Health
ELV
$85.6B
| $34.2M | 0.07% |
1,133
+648
| +134% | +$178K |
|
168
CALL
NXP Semiconductors
NXPI
$69.3B
| $34M | 0.07% |
2,669
-344
| -11% | -$39.9K |
|
169
CALL
Mercado Libre
MELI
$91.4B
| $33.7M | 0.07% |
590
+228
| +63% | +$126K |
|
170
PUT
Medtronic
MDT
$105B
| $33.7M | 0.07% |
2,968
+991
| +50% | +$109K |
|
171
CALL
IBM
IBM
$198B
| $33.5M | 0.07% |
2,616
-1,862
| -42% | -$242K |
|
172
PUT
CVS Health
CVS
$141B
| $33.5M | 0.07% |
4,506
-1,553
| -26% | -$109K |
|
|
TWTR
173
CALL
DELISTED
Twitter, Inc.
TWTR
| $33.4M | 0.07% |
10,410
+2,272
| +28% | +$74.7K |
|
|
174
PUT
NXP Semiconductors
NXPI
$69.3B
| $33M | 0.07% |
2,597
-153
| -6% | -$17.8K |
|
175
PUT
Uber
UBER
$144B
| $33M | 0.07% |
11,105
+6,594
| +146% | +$196K |
|
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.