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 | |
|---|---|---|---|---|---|---|
|
SII
3101
Sprott
SII
$2.65B
| $893K | ﹤0.01% |
26,323
+9,810
| +59% | +$303K |
|
3102
Corporacion America
CAAP
$4.11B
| $892K | ﹤0.01% |
55,551
+54,679
| +6,271% | +$723K |
|
3103
PUT
Eagle Materials
EXP
$6.6B
| $892K | ﹤0.01% |
4,400
-15,600
| -78% | -$2.74M |
|
3104
CALL
The Greenbrier Companies
GBX
$1.61B
| $892K | ﹤0.01% |
20,200
+7,000
| +53% | +$274K |
|
|
ALTR
3105
PUT
DELISTED
Altair Engineering Inc
ALTR
| $891K | ﹤0.01% |
+10,600
| New | +$737K |
|
3106
CALL
Boot Barn
BOOT
$4.55B
| $890K | ﹤0.01% |
11,600
-3,500
| -23% | -$263K |
|
3107
CALL
Blackstone Secured Lending
BXSL
$5.41B
| $887K | ﹤0.01% |
32,100
+7,700
| +32% | +$213K |
|
|
DO
3108
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $887K | ﹤0.01% |
+68,304
| New | +$882K |
|
3109
GSK
GSK
$103B
| $886K | ﹤0.01% |
23,924
-100,539
| -81% | -$3.61M |
|
3110
PUT
Patterson-UTI
PTEN
$3.87B
| $886K | ﹤0.01% |
82,100
+68,700
| +513% | +$835K |
|
3111
Sensata Technologies
ST
$6.65B
| $886K | ﹤0.01% |
+23,595
| New | +$815K |
|
|
HPP
3112
CALL
Hudson Pacific Properties
HPP
$834M
| $885K | ﹤0.01% |
13,586
+11,615
| +589% | +$512K |
|
3113
PUT
Stride
LRN
$3.69B
| $884K | ﹤0.01% |
14,900
-56,600
| -79% | -$3.1M |
|
3114
CALL
RUM Group Inc
RUM
$1.57B
| $884K | ﹤0.01% |
196,900
+4,100
| +2% | +$20K |
|
3115
ZIM Integrated Shipping Services
ZIM
$3B
| $884K | ﹤0.01% |
89,647
-275,551
| -75% | -$2.32M |
|
|
VSTO
3116
PUT
DELISTED
Vista Outdoor Inc.
VSTO
| $884K | ﹤0.01% |
29,900
+22,700
| +315% | +$625K |
|
3117
NexGen Energy
NXE
$6.05B
| $883K | ﹤0.01% |
126,176
-124,050
| -50% | -$772K |
|
3118
PUT
Verisk Analytics
VRSK
$26.4B
| $883K | ﹤0.01% |
3,700
-1,600
| -30% | -$379K |
|
3119
CALL
Vanguard Total Bond Market
BND
$157B
| $882K | ﹤0.01% |
11,800
+3,800
| +48% | +$268K |
|
3120
CALL
Federal Signal
FSS
$7.25B
| $882K | ﹤0.01% |
11,500
+11,400
| +11,400% | +$760K |
|
3121
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.9B
| $882K | ﹤0.01% |
32,000
-27,200
| -46% | -$592K |
|
3122
CALL
Blue Owl Capital
OWL
$6.39B
| $882K | ﹤0.01% |
59,200
+38,200
| +182% | +$514K |
|
3123
PUT
Freshworks
FRSH
$2.84B
| $880K | ﹤0.01% |
37,500
-30,700
| -45% | -$607K |
|
3124
CALL
Viasat
VSAT
$9.79B
| $880K | ﹤0.01% |
31,500
+9,100
| +41% | +$190K |
|
|
WCN
3125
CALL
Waste Connections
WCN
$42.8B
| $880K | ﹤0.01% |
5,900
+2,700
| +84% | +$371K |
|
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.