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 | |
|---|---|---|---|---|---|---|
4851
CALL
Upbound Group
UPBD
$1.22B
| $166K | ﹤0.01% |
4,900
-1,500
| -23% | -$44.7K |
|
4852
CALL
Genesis Energy
GEL
$1.82B
| $165K | ﹤0.01% |
14,300
+11,600
| +430% | +$133K |
|
4853
iShares S&P Mid-Cap 400 Growth ETF
IJK
$10.6B
| $165K | ﹤0.01% |
+2,085
| New | +$153K |
|
4854
CALL
Movado Group
MOV
$840M
| $165K | ﹤0.01% |
5,500
+5,000
| +1,000% | +$143K |
|
4855
Children's Place
PLCE
$53.8M
| $165K | ﹤0.01% |
7,132
-2,908
| -29% | -$70.7K |
|
|
RC
4856
CALL
Ready Capital
RC
$260M
| $165K | ﹤0.01% |
16,200
-7,100
| -30% | -$72.2K |
|
4857
CALL
Worksport
WKSP
$8.95M
| $165K | ﹤0.01% |
11,120
-1,330
| -11% | -$21.1K |
|
4858
CALL
Petco
WOOF
$797M
| $165K | ﹤0.01% |
52,500
-9,100
| -15% | -$31.4K |
|
|
4859
Petco
WOOF
$797M
| $165K | ﹤0.01% |
52,287
+12,659
| +32% | +$43.7K |
|
|
ACCD
4860
PUT
DELISTED
Accolade Inc
ACCD
| $165K | ﹤0.01% |
13,800
-70,000
| -84% | -$600K |
|
|
GRTS
4861
CALL
DELISTED
Gritstone bio, Inc. Common Stock
GRTS
| $165K | ﹤0.01% |
81,300
+39,200
| +93% | +$71.6K |
|
4862
PUT
Coherus Oncology
CHRS
$217M
| $164K | ﹤0.01% |
49,300
+12,600
| +34% | +$33.7K |
|
4863
CALL
Flowers Foods
FLO
$1.58B
| $164K | ﹤0.01% |
7,300
-13,900
| -66% | -$300K |
|
4864
PUT
Hubbell
HUBB
$24.4B
| $164K | ﹤0.01% |
+500
| New | +$150K |
|
4865
MasterBrand
MBC
$1.09B
| $164K | ﹤0.01% |
+11,101
| New | +$142K |
|
|
NNDM
4866
PUT
Nano Dimension
NNDM
$314M
| $164K | ﹤0.01% |
68,400
+1,500
| +2% | +$3.77K |
|
|
OGI
4867
Organigram Holdings
OGI
$131M
| $164K | ﹤0.01% |
125,900
+117,473
| +1,394% | +$144K |
|
4868
PUT
Plains GP Holdings
PAGP
$5.28B
| $164K | ﹤0.01% |
10,300
+500
| +5% | +$7.9K |
|
4869
PUT
Qfin Holdings
QFIN
$1.68B
| $164K | ﹤0.01% |
10,400
-200
| -2% | -$3.06K |
|
4870
Essential Utilities
WTRG
$11.5B
| $164K | ﹤0.01% |
4,410
-25,084
| -85% | -$876K |
|
|
AIRC
4871
DELISTED
Apartment Income REIT Corp.
AIRC
| $164K | ﹤0.01% |
4,735
+4,292
| +969% | +$134K |
|
4872
Driven Brands
DRVN
$2.47B
| $163K | ﹤0.01% |
11,475
+6,481
| +130% | +$80.8K |
|
|
MREO
4873
CALL
Mereo BioPharma
MREO
$48.9M
| $163K | ﹤0.01% |
70,600
-8,500
| -11% | -$16.3K |
|
4874
CALL
Northeast Community Bancorp
NECB
$373M
| $163K | ﹤0.01% |
9,200
+4,100
| +80% | +$66.6K |
|
4875
CALL
Pampa Energía
PAM
$4.57B
| $163K | ﹤0.01% |
3,300
+3,200
| +3,200% | +$136K |
|
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.