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 | |
|---|---|---|---|---|---|---|
3751
CALL
Agree Realty
ADC
$9.74B
| $478K | ﹤0.01% |
7,600
+700
| +10% | +$40.6K |
|
3752
CALL
Palomar
PLMR
$3.83B
| $477K | ﹤0.01% |
8,600
+2,300
| +37% | +$129K |
|
3753
Iris Energy
IREN
$12.1B
| $476K | ﹤0.01% |
66,575
+13,015
| +24% | +$56K |
|
3754
CALL
NovoCure
NVCR
$1.93B
| $476K | ﹤0.01% |
31,900
-12,700
| -28% | -$170K |
|
3755
PUT
Perion Network
PERI
$376M
| $475K | ﹤0.01% |
15,400
-49,700
| -76% | -$1.41M |
|
|
BDN
3756
CALL
Brandywine Realty Trust
BDN
$525M
| $474K | ﹤0.01% |
87,800
-4,700
| -5% | -$20.6K |
|
3757
Invesco CurrencyShares Canadian Dollar Trust
FXC
$72.7M
| $474K | ﹤0.01% |
6,426
+1,452
| +29% | +$104K |
|
3758
Sotera Health
SHC
$4.99B
| $474K | ﹤0.01% |
28,154
+12,024
| +75% | +$170K |
|
3759
CALL
TriMas Corp
TRS
$1.44B
| $473K | ﹤0.01% |
+18,700
| New | +$462K |
|
|
ONIT
3760
PUT
Onity Group
ONIT
$343M
| $473K | ﹤0.01% |
15,400
| – | – |
|
|
BVH
3761
PUT
DELISTED
Bluegreen Vacations Holding Corporation
BVH
| $473K | ﹤0.01% |
+6,300
| New | +$367K |
|
3762
CALL
Utz Brands
UTZ
$1.25B
| $472K | ﹤0.01% |
29,100
+21,200
| +268% | +$280K |
|
3763
CALL
BellRing Brands
BRBR
$1.6B
| $471K | ﹤0.01% |
8,500
-4,600
| -35% | -$222K |
|
|
CIVI
3764
PUT
DELISTED
Civitas Resources
CIVI
| $471K | ﹤0.01% |
6,900
-40,700
| -86% | -$2.91M |
|
3765
CALL
Essex Property Trust
ESS
$19B
| $471K | ﹤0.01% |
1,900
+600
| +46% | +$132K |
|
3766
PUT
Kulicke & Soffa
KLIC
$4.7B
| $470K | ﹤0.01% |
8,600
-400
| -4% | -$19.4K |
|
3767
Virtu Financial
VIRT
$5.06B
| $470K | ﹤0.01% |
23,227
+15,031
| +183% | +$277K |
|
3768
Zentalis Pharmaceuticals
ZNTL
$322M
| $470K | ﹤0.01% |
31,078
+28,865
| +1,304% | +$421K |
|
3769
HUB Group
HUBG
$2.94B
| $469K | ﹤0.01% |
+10,208
| New | +$401K |
|
|
MOMO
3770
CALL
Hello Group
MOMO
$870M
| $469K | ﹤0.01% |
67,600
+13,000
| +24% | +$90.5K |
|
3771
PUT
Red Rock Resorts
RRR
$3.85B
| $469K | ﹤0.01% |
8,800
+7,800
| +780% | +$346K |
|
|
WIRE
3772
PUT
DELISTED
Encore Wire Corp
WIRE
| $469K | ﹤0.01% |
2,200
-600
| -21% | -$114K |
|
3773
Ginkgo Bioworks
DNA
$504M
| $468K | ﹤0.01% |
6,923
+3,726
| +117% | +$228K |
|
3774
Outfront Media
OUT
$5.66B
| $468K | ﹤0.01% |
+34,107
| New | +$385K |
|
3775
CALL
Coeur Mining
CDE
$15.3B
| $467K | ﹤0.01% |
143,500
+91,000
| +173% | +$248K |
|
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.