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 | |
|---|---|---|---|---|---|---|
4126
PUT
SSR Mining
SSRM
$5.27B
| $327K | ﹤0.01% |
30,400
+200
| +0.7% | +$2.43K |
|
4127
CALL
Methanex
MEOH
$4.12B
| $326K | ﹤0.01% |
6,900
+1,800
| +35% | +$78.3K |
|
4128
PUT
Viper Energy
VNOM
$8.21B
| $326K | ﹤0.01% |
10,400
-10,100
| -49% | -$300K |
|
4129
CALL
Ingredion
INGR
$6.48B
| $325K | ﹤0.01% |
3,000
+2,600
| +650% | +$261K |
|
4130
CALL
Lakeland Financial Corp
LKFN
$1.58B
| $325K | ﹤0.01% |
5,000
+4,800
| +2,400% | +$265K |
|
4131
CALL
SandRidge Energy
SD
$485M
| $325K | ﹤0.01% |
23,800
-3,900
| -14% | -$57.6K |
|
4132
CALL
W&T Offshore
WTI
$473M
| $325K | ﹤0.01% |
99,900
+76,200
| +322% | +$281K |
|
|
ALTR
4133
DELISTED
Altair Engineering Inc
ALTR
| $325K | ﹤0.01% |
+3,870
| New | +$269K |
|
|
ENLC
4134
PUT
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $325K | ﹤0.01% |
26,800
-1,800
| -6% | -$22.6K |
|
4135
AbCellera Biologics
ABCL
$1.62B
| $324K | ﹤0.01% |
56,860
+52,851
| +1,318% | +$245K |
|
4136
PUT
Addus HomeCare
ADUS
$2.23B
| $324K | ﹤0.01% |
3,500
+3,300
| +1,650% | +$287K |
|
4137
CALL
Alto Ingredients
ALTO
$345M
| $324K | ﹤0.01% |
122,100
-73,700
| -38% | -$235K |
|
4138
CALL
Alpha Pro Tech
APT
$51.1M
| $324K | ﹤0.01% |
61,300
-24,000
| -28% | -$110K |
|
4139
NGL Energy Partners
NGL
$1.87B
| $324K | ﹤0.01% |
58,281
+1,877
| +3% | +$8.13K |
|
4140
Rayonier Advanced Materials
RYAM
$591M
| $324K | ﹤0.01% |
80,162
+26,384
| +49% | +$86.7K |
|
4141
CALL
Core & Main
CNM
$8.23B
| $323K | ﹤0.01% |
+8,000
| New | +$271K |
|
4142
PUT
Evergy
EVRG
$19.7B
| $323K | ﹤0.01% |
6,200
+5,900
| +1,967% | +$297K |
|
4143
CALL
National Beverage
FIZZ
$3.05B
| $323K | ﹤0.01% |
6,500
+2,100
| +48% | +$100K |
|
4144
PUT
Fabrinet
FN
$16.1B
| $323K | ﹤0.01% |
1,700
-1,000
| -37% | -$171K |
|
|
RAPT
4145
CALL
DELISTED
RAPT Therapeutics
RAPT
| $323K | ﹤0.01% |
1,625
+1,075
| +195% | +$133K |
|
4146
PUT
ATI
ATI
$25.5B
| $322K | ﹤0.01% |
7,100
-100
| -1% | -$4.15K |
|
4147
PUT
Bio-Rad Laboratories Class A
BIO
$8.86B
| $322K | ﹤0.01% |
1,000
-6,400
| -86% | -$2.01M |
|
4148
CALL
Genpact
G
$5.87B
| $322K | ﹤0.01% |
+9,300
| New | +$321K |
|
|
MFA
4149
PUT
MFA Financial
MFA
$935M
| $322K | ﹤0.01% |
28,600
+21,500
| +303% | +$217K |
|
|
MDC
4150
DELISTED
M.D.C. Holdings, Inc.
MDC
| $322K | ﹤0.01% |
+5,831
| New | +$258K |
|
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.