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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4976
CALL
Sumitomo Mitsui Financial
SMFG
$164B
| $150K | ﹤0.01% |
15,500
+300
| +2% | +$2.91K |
|
|
SNBR
4977
DELISTED
Sleep Number
SNBR
| $150K | ﹤0.01% |
10,177
-20,433
| -67% | -$317K |
|
4978
ProShares UltraShort Russell2000
TWM
$43.8M
| $150K | ﹤0.01% |
+2,582
| New | +$197K |
|
4979
PUT
Vista Energy
VIST
$7.63B
| $150K | ﹤0.01% |
5,100
-12,600
| -71% | -$372K |
|
4980
CALL
ADMA Biologics
ADMA
$2.01B
| $149K | ﹤0.01% |
33,100
+25,600
| +341% | +$94.7K |
|
|
CVGW
4981
PUT
DELISTED
Calavo Growers
CVGW
| $149K | ﹤0.01% |
5,100
+3,300
| +183% | +$85K |
|
4982
Denison Mines
DNN
$2.64B
| $149K | ﹤0.01% |
84,712
-228,554
| -73% | -$382K |
|
4983
PUT
Pilgrim's Pride
PPC
$6.98B
| $149K | ﹤0.01% |
5,400
+4,800
| +800% | +$122K |
|
|
RC
4984
PUT
Ready Capital
RC
$261M
| $149K | ﹤0.01% |
14,600
-9,800
| -40% | -$99.6K |
|
4985
PUT
Robert Half
RHI
$3.81B
| $149K | ﹤0.01% |
1,700
-5,600
| -77% | -$445K |
|
4986
CALL
Cactus
WHD
$4.3B
| $149K | ﹤0.01% |
3,300
-7,900
| -71% | -$359K |
|
4987
PUT
Woodward
WWD
$21.2B
| $149K | ﹤0.01% |
1,100
-19,500
| -95% | -$2.55M |
|
4988
Anterix
ATEX
$1.82B
| $148K | ﹤0.01% |
4,451
+288
| +7% | +$9.29K |
|
4989
CALL
AptarGroup
ATR
$8.54B
| $148K | ﹤0.01% |
+1,200
| New | +$151K |
|
4990
PUT
Clearfield
CLFD
$420M
| $148K | ﹤0.01% |
5,100
+2,900
| +132% | +$77.3K |
|
4991
iShares MSCI South Africa ETF
EZA
$551M
| $148K | ﹤0.01% |
3,550
-194
| -5% | -$7.62K |
|
4992
PUT
Lightwave Logic
LWLG
$931M
| $148K | ﹤0.01% |
29,800
+6,400
| +27% | +$30.2K |
|
4993
CALL
Rackspace Technology
RXT
$1.07B
| $148K | ﹤0.01% |
74,200
+56,600
| +322% | +$85.5K |
|
4994
Hamilton Lane
HLNE
$3.89B
| $147K | ﹤0.01% |
+1,303
| New | +$123K |
|
4995
CALL
MarineMax
HZO
$772M
| $147K | ﹤0.01% |
3,800
-400
| -10% | -$12.7K |
|
4996
Scilex Holding
SCLX
$46.4M
| $147K | ﹤0.01% |
+2,061
| New | +$107K |
|
|
SILK
4997
DELISTED
Silk Road Medical, Inc. Common Stock
SILK
| $147K | ﹤0.01% |
+12,022
| New | +$113K |
|
|
MORF
4998
CALL
DELISTED
Morphic Holding, Inc. Common Stock
MORF
| $147K | ﹤0.01% |
5,100
-48,400
| -90% | -$1.15M |
|
|
PBT
4999
CALL
Permian Basin Royalty Trust
PBT
$1.39B
| $146K | ﹤0.01% |
10,500
+1,300
| +14% | +$23.3K |
|
5000
uniQure
QURE
$2.93B
| $146K | ﹤0.01% |
21,599
+2,644
| +14% | +$17.5K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.