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 | |
|---|---|---|---|---|---|---|
|
STZ.B
126
PUT
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $44.1M | 0.1% |
2,325
-211
| -8% | -$40K |
|
127
CALL
Union Pacific
UNP
$174B
| $44M | 0.1% |
2,431
+318
| +15% | +$54.4K |
|
128
PUT
lululemon athletica
LULU
$12.9B
| $43.2M | 0.09% |
1,865
+1,103
| +145% | +$235K |
|
129
PUT
Gilead Sciences
GILD
$162B
| $42.7M | 0.09% |
6,576
+2,721
| +71% | +$177K |
|
130
CALL
ServiceNow
NOW
$98.4B
| $42.7M | 0.09% |
7,555
-3,135
| -29% | -$165K |
|
131
CALL
AutoZone
AZO
$48.5B
| $42.5M | 0.09% |
357
+220
| +161% | +$254K |
|
132
CALL
Cisco
CSCO
$442B
| $42.5M | 0.09% |
8,867
+2,185
| +33% | +$102K |
|
133
PUT
RH
RH
$3.31B
| $42.2M | 0.09% |
1,977
+1,116
| +130% | +$218K |
|
134
CALL
McDonald's
MCD
$187B
| $41.9M | 0.09% |
2,119
-1,498
| -41% | -$297K |
|
135
PUT
Intel
INTC
$516B
| $41.8M | 0.09% |
6,987
+1,477
| +27% | +$82.7K |
|
136
CALL
AT&T
T
$160B
| $41.8M | 0.09% |
14,147
+573
| +4% | +$16.5K |
|
137
CALL
Delta Air Lines
DAL
$54.9B
| $41.2M | 0.09% |
7,037
+766
| +12% | +$43K |
|
|
138
CALL
Intel
INTC
$516B
| $41M | 0.09% |
6,845
+1,328
| +24% | +$74.3K |
|
139
PUT
Autodesk
ADSK
$43B
| $40.2M | 0.09% |
2,192
+575
| +36% | +$93.2K |
|
140
CALL
Wynn Resorts
WYNN
$9.79B
| $39.8M | 0.09% |
2,863
+1,326
| +86% | +$161K |
|
141
CALL
Walmart Inc
WMT
$870B
| $39.7M | 0.09% |
10,020
-5,157
| -34% | -$205K |
|
142
PUT
Charter Communications
CHTR
$15.9B
| $39.6M | 0.09% |
816
+513
| +169% | +$236K |
|
143
PUT
Illumina
ILMN
$28.9B
| $39.4M | 0.09% |
1,221
+558
| +84% | +$169K |
|
|
144
CALL
lululemon athletica
LULU
$12.9B
| $39.3M | 0.09% |
1,697
+510
| +43% | +$109K |
|
|
145
CALL
Illumina
ILMN
$28.9B
| $38.9M | 0.09% |
1,207
+490
| +68% | +$149K |
|
146
CALL
Intuitive Surgical
ISRG
$121B
| $38.6M | 0.08% |
1,959
+861
| +78% | +$161K |
|
|
147
PUT
Union Pacific
UNP
$174B
| $38.6M | 0.08% |
2,133
+789
| +59% | +$135K |
|
|
148
PUT
Walmart Inc
WMT
$870B
| $38.2M | 0.08% |
9,639
-2,910
| -23% | -$116K |
|
|
149
PUT
AT&T
T
$160B
| $38.2M | 0.08% |
12,933
-4,417
| -25% | -$128K |
|
150
CALL
Nike
NKE
$62.6B
| $37.8M | 0.08% |
3,731
+960
| +35% | +$90.5K |
|
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.