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 | |
|---|---|---|---|---|---|---|
2051
CALL
Ventas
VTR
$48.9B
| $1.06M | ﹤0.01% |
183
-26
| -12% | -$1.63K |
|
2052
PUT
Houlihan Lokey
HLI
$9.68B
| $1.05M | ﹤0.01% |
+216
| New | +$10.2K |
|
2053
CALL
Viking Therapeutics
VKTX
$4.04B
| $1.05M | ﹤0.01% |
1,310
+867
| +196% | +$6.32K |
|
|
CRCM
2054
CALL
DELISTED
CARE.COM, INC.
CRCM
| $1.05M | ﹤0.01% |
699
+344
| +97% | +$4.13K |
|
2055
PUT
Marcus Corp
MCS
$732M
| $1.05M | ﹤0.01% |
330
| – | – |
|
2056
Merit Medical Systems
MMSI
$4.43B
| $1.05M | ﹤0.01% |
+33,571
| New | +$961K |
|
|
SINA
2057
DELISTED
Sina Corp
SINA
| $1.05M | ﹤0.01% |
26,259
+23,449
| +834% | +$900K |
|
|
WUBA
2058
CALL
DELISTED
58.com Inc
WUBA
| $1.05M | ﹤0.01% |
162
+92
| +131% | +$5.17K |
|
2059
Envista
NVST
$4.28B
| $1.05M | ﹤0.01% |
+35,351
| New | +$1.01M |
|
|
FRC
2060
PUT
DELISTED
First Republic Bank
FRC
| $1.04M | ﹤0.01% |
89
+74
| +493% | +$7.99K |
|
2061
PUT
Invitation Homes
INVH
$17.7B
| $1.04M | ﹤0.01% |
348
+209
| +150% | +$6.26K |
|
|
TGNA
2062
DELISTED
TEGNA Inc
TGNA
| $1.04M | ﹤0.01% |
+62,452
| New | +$972K |
|
|
IBTX
2063
CALL
DELISTED
Independent Bank Group, Inc.
IBTX
| $1.04M | ﹤0.01% |
+188
| New | +$10.4K |
|
2064
PUT
Cincinnati Financial
CINF
$28.3B
| $1.04M | ﹤0.01% |
99
+19
| +24% | +$2.08K |
|
2065
PUT
Vermilion Energy
VET
$1.73B
| $1.04M | ﹤0.01% |
634
+501
| +377% | +$7.54K |
|
2066
CALL
Pricesmart
PSMT
$5.75B
| $1.04M | ﹤0.01% |
146
+96
| +192% | +$6.9K |
|
|
CS
2067
DELISTED
Credit Suisse Group
CS
| $1.03M | ﹤0.01% |
76,998
-53,844
| -41% | -$688K |
|
2068
CALL
Supernus Pharmaceuticals
SUPN
$2.68B
| $1.03M | ﹤0.01% |
435
+264
| +154% | +$6.41K |
|
2069
PUT
Voya Financial
VOYA
$8.94B
| $1.03M | ﹤0.01% |
169
+155
| +1,107% | +$8.75K |
|
2070
Wells Fargo
WFC
$261B
| $1.03M | ﹤0.01% |
+19,146
| New | +$1M |
|
2071
Textron
TXT
$16.6B
| $1.02M | ﹤0.01% |
22,997
+22,846
| +15,130% | +$1.06M |
|
2072
CALL
Gibraltar Industries
ROCK
$1.34B
| $1.02M | ﹤0.01% |
203
+168
| +480% | +$8.44K |
|
|
SSI
2073
DELISTED
Stage Stores Inc
SSI
| $1.02M | ﹤0.01% |
125,980
+111,235
| +754% | +$431K |
|
2074
CALL
Zebra Technologies
ZBRA
$12.4B
| $1.02M | ﹤0.01% |
40
+24
| +150% | +$5.62K |
|
2075
CALL
New Oriental
EDU
$7.84B
| $1.02M | ﹤0.01% |
84
-2
| -2% | -$239 |
|
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.