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 | |
|---|---|---|---|---|---|---|
1951
CALL
Skywest
SKYW
$4.11B
| $1.17M | ﹤0.01% |
+181
| New | +$11K |
|
1952
Synaptics
SYNA
$4.41B
| $1.17M | ﹤0.01% |
+17,720
| New | +$934K |
|
1953
CALL
AES
AES
$10.6B
| $1.16M | ﹤0.01% |
585
+259
| +79% | +$4.63K |
|
|
SIX
1954
PUT
DELISTED
Six Flags Entertainment Corp.
SIX
| $1.16M | ﹤0.01% |
258
+21
| +9% | +$966 |
|
|
TECD
1955
PUT
DELISTED
Tech Data Corp
TECD
| $1.16M | ﹤0.01% |
81
+72
| +800% | +$9.26K |
|
1956
PUT
Box
BOX
$4.02B
| $1.16M | ﹤0.01% |
693
+183
| +36% | +$3.07K |
|
1957
PUT
Gold Fields
GFI
$29.2B
| $1.16M | ﹤0.01% |
1,761
+221
| +14% | +$1.25K |
|
1958
CALL
ATI
ATI
$27B
| $1.16M | ﹤0.01% |
561
+389
| +226% | +$8.43K |
|
1959
PUT
Texas Capital Bancshares
TCBI
$4.31B
| $1.16M | ﹤0.01% |
204
-82
| -29% | -$4.67K |
|
1960
Under Armour Class C
UA
$2.92B
| $1.16M | ﹤0.01% |
60,371
+48,883
| +426% | +$860K |
|
1961
CALL
Nasdaq
NDAQ
$51.5B
| $1.16M | ﹤0.01% |
324
+171
| +112% | +$5.83K |
|
1962
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $1.16M | ﹤0.01% |
454
-542
| -54% | -$14.5K |
|
1963
CALL
Simpson Manufacturing
SSD
$7.98B
| $1.16M | ﹤0.01% |
144
-16
| -10% | -$1.25K |
|
|
WCG
1964
DELISTED
Wellcare Health Plans, Inc.
WCG
| $1.16M | ﹤0.01% |
+3,500
| New | +$1.05M |
|
1965
PUT
ArcelorMittal
MT
$50.4B
| $1.15M | ﹤0.01% |
657
-238
| -27% | -$3.86K |
|
|
AXE
1966
CALL
DELISTED
Anixter International Inc
AXE
| $1.15M | ﹤0.01% |
125
+67
| +116% | +$5.43K |
|
1967
PUT
Cheesecake Factory
CAKE
$4.21B
| $1.15M | ﹤0.01% |
296
+245
| +480% | +$10.1K |
|
1968
Acadia Pharmaceuticals
ACAD
$4.25B
| $1.15M | ﹤0.01% |
26,854
-40,966
| -60% | -$1.78M |
|
1969
Intel
INTC
$466B
| $1.15M | ﹤0.01% |
+19,191
| New | +$1.07M |
|
|
CCMP
1970
DELISTED
CMC Materials, Inc. Common Stock
CCMP
| $1.15M | ﹤0.01% |
+7,956
| New | +$1.13M |
|
1971
CALL
Lennox International
LII
$18.8B
| $1.15M | ﹤0.01% |
47
+10
| +27% | +$2.48K |
|
|
CEQP
1972
CALL
DELISTED
Crestwood Equity Partners LP
CEQP
| $1.15M | ﹤0.01% |
372
-20
| -5% | -$658 |
|
1973
CALL
Dycom Industries
DY
$12.9B
| $1.15M | ﹤0.01% |
243
+227
| +1,419% | +$11K |
|
1974
CALL
Motorola Solutions
MSI
$69.4B
| $1.14M | ﹤0.01% |
71
-162
| -70% | -$26.7K |
|
1975
PUT
HEICO Corp Class A
HEI.A
$35.4B
| $1.14M | ﹤0.01% |
100
-315
| -76% | -$30K |
|
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.