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 | |
|---|---|---|---|---|---|---|
|
TGR
2176
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $910K | ﹤0.01% |
467
-5
| -1% | -$9.74K |
|
2177
PUT
CNX Resources
CNX
$4.85B
| $909K | ﹤0.01% |
1,028
+204
| +25% | +$1.59K |
|
2178
CALL
Visteon
VC
$2.77B
| $909K | ﹤0.01% |
105
-164
| -61% | -$14.6K |
|
2179
Deckers Outdoor
DECK
$13.3B
| $907K | ﹤0.01% |
32,250
+18,996
| +143% | +$504K |
|
2180
LyondellBasell Industries
LYB
$19.5B
| $907K | ﹤0.01% |
9,607
+5,852
| +156% | +$536K |
|
2181
CALL
Atkore
ATKR
$2.59B
| $906K | ﹤0.01% |
224
-27
| -11% | -$999 |
|
2182
iShares MSCI Hong Kong ETF
EWH
$1.22B
| $906K | ﹤0.01% |
+37,258
| New | +$880K |
|
|
XLRN
2183
PUT
DELISTED
Acceleron Pharma
XLRN
| $906K | ﹤0.01% |
171
+168
| +5,600% | +$7.66K |
|
|
CLDR
2184
PUT
DELISTED
Cloudera, Inc.
CLDR
| $906K | ﹤0.01% |
780
-1,254
| -62% | -$12K |
|
|
ECOL
2185
CALL
DELISTED
US Ecology, Inc.
ECOL
| $903K | ﹤0.01% |
156
-113
| -42% | -$6.7K |
|
2186
CALL
BlackLine
BL
$1.69B
| $902K | ﹤0.01% |
175
+137
| +361% | +$6.84K |
|
2187
CALL
West Pharmaceutical
WST
$23.1B
| $901K | ﹤0.01% |
60
+48
| +400% | +$6.99K |
|
2188
Harley-Davidson
HOG
$2.68B
| $899K | ﹤0.01% |
24,176
+15,665
| +184% | +$583K |
|
2189
CALL
InterDigital
IDCC
$6.68B
| $899K | ﹤0.01% |
165
-217
| -57% | -$12K |
|
2190
Guardant Health
GH
$19.5B
| $898K | ﹤0.01% |
+11,504
| New | +$829K |
|
2191
CALL
United Therapeutics
UTHR
$26.3B
| $898K | ﹤0.01% |
102
+39
| +62% | +$3.43K |
|
|
ZGNX
2192
DELISTED
Zogenix, Inc.
ZGNX
| $895K | ﹤0.01% |
17,179
-25,278
| -60% | -$1.16M |
|
|
BERY
2193
PUT
DELISTED
Berry Global Group, Inc.
BERY
| $892K | ﹤0.01% |
205
-371
| -64% | -$14.7K |
|
2194
Energy Transfer Partners
ET
$70.1B
| $891K | ﹤0.01% |
69,463
+31,098
| +81% | +$383K |
|
2195
PUT
Tower Semiconductor
TSEM
$26.4B
| $890K | ﹤0.01% |
370
-46
| -11% | -$1.03K |
|
|
SPWR
2196
PUT
DELISTED
SunPower Corporation Common Stock
SPWR
| $887K | ﹤0.01% |
1,738
+1,217
| +234% | +$6.77K |
|
2197
PUT
Entergy
ETR
$54.1B
| $886K | ﹤0.01% |
148
-62
| -30% | -$3.65K |
|
2198
CALL
Veracyte
VCYT
$4.52B
| $885K | ﹤0.01% |
317
+314
| +10,467% | +$8.13K |
|
|
ACB
2199
CALL
Aurora Cannabis
ACB
$165M
| $884K | ﹤0.01% |
34
-5
| -13% | -$1.86K |
|
|
HTT
2200
CALL
High Templar Tech Ltd
HTT
$377M
| $884K | ﹤0.01% |
1,877
+135
| +8% | +$794 |
|
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.