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 | |
|---|---|---|---|---|---|---|
|
PRA
4201
PUT
DELISTED
ProAssurance
PRA
| $308K | ﹤0.01% |
+22,400
| New | +$343K |
|
4202
CALL
Rush Street Interactive
RSI
$3.12B
| $308K | ﹤0.01% |
68,600
+38,100
| +125% | +$158K |
|
|
GLDD
4203
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
| $307K | ﹤0.01% |
40,100
+20,300
| +103% | +$148K |
|
4204
PUT
Integer Holdings
ITGR
$3.42B
| $307K | ﹤0.01% |
+3,100
| New | +$267K |
|
4205
CALL
Mitek Systems
MITK
$757M
| $307K | ﹤0.01% |
23,600
+3,000
| +15% | +$33.4K |
|
4206
PUT
Assured Guaranty
AGO
$3.79B
| $306K | ﹤0.01% |
4,100
-7,800
| -66% | -$515K |
|
4207
Maravai LifeSciences
MRVI
$966M
| $305K | ﹤0.01% |
46,615
+34,845
| +296% | +$225K |
|
|
ACLX
4208
DELISTED
Arcellx
ACLX
| $304K | ﹤0.01% |
5,481
+5,472
| +60,800% | +$247K |
|
4209
PUT
Columbia Banking Systems
COLB
$8.8B
| $304K | ﹤0.01% |
11,400
+7,600
| +200% | +$169K |
|
4210
PUT
Healthcare Realty
HR
$7.57B
| $304K | ﹤0.01% |
17,700
-29,300
| -62% | -$447K |
|
4211
Navios Maritime Partners
NMM
$2.23B
| $304K | ﹤0.01% |
+10,880
| New | +$262K |
|
4212
PUT
SkyWater Technology
SKYT
$1.52B
| $304K | ﹤0.01% |
31,700
-600
| -2% | -$4.01K |
|
|
ARVL
4213
PUT
DELISTED
Arrival Ordinary Shares
ARVL
| $304K | ﹤0.01% |
154,300
+18,600
| +14% | +$21.3K |
|
4214
CALL
Lifestance Health
LFST
$4.22B
| $303K | ﹤0.01% |
38,700
+21,900
| +130% | +$141K |
|
4215
CALL
Titan Machinery
TITN
$426M
| $303K | ﹤0.01% |
10,500
+9,900
| +1,650% | +$257K |
|
4216
PUT
Verra Mobility
VRRM
$799M
| $303K | ﹤0.01% |
13,200
-13,800
| -51% | -$283K |
|
4217
CALL
Dorchester Minerals
DMLP
$1.31B
| $302K | ﹤0.01% |
9,500
-900
| -9% | -$26.3K |
|
4218
CMS Energy
CMS
$23.1B
| $301K | ﹤0.01% |
+5,186
| New | +$290K |
|
|
CVAC
4219
CALL
DELISTED
CureVac
CVAC
| $301K | ﹤0.01% |
71,500
+63,500
| +794% | +$344K |
|
4220
PUT
NNN REIT
NNN
$9.41B
| $301K | ﹤0.01% |
7,000
+4,500
| +180% | +$174K |
|
4221
PUT
Tiptree Inc
TIPT
$694M
| $301K | ﹤0.01% |
15,900
+200
| +1% | +$3.46K |
|
4222
CALL
Conduent
CNDT
$248M
| $300K | ﹤0.01% |
82,200
+30,800
| +60% | +$97.4K |
|
4223
CALL
Genie Energy
GNE
$373M
| $300K | ﹤0.01% |
10,700
+8,800
| +463% | +$202K |
|
4224
Pilgrim's Pride
PPC
$7.12B
| $300K | ﹤0.01% |
10,881
+8,546
| +366% | +$218K |
|
4225
Travelers Companies
TRV
$82.8B
| $300K | ﹤0.01% |
+1,579
| New | +$273K |
|
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.