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 | |
|---|---|---|---|---|---|---|
4826
Energy Fuels
UUUU
$2.68B
| $170K | ﹤0.01% |
23,752
-69,391
| -74% | -$537K |
|
4827
PUT
Vishay Intertechnology
VSH
$4.6B
| $170K | ﹤0.01% |
7,100
-4,300
| -38% | -$99.7K |
|
4828
PUT
TeraWulf
WULF
$7.48B
| $170K | ﹤0.01% |
71,100
+59,400
| +508% | +$80.9K |
|
|
RAD
4829
PUT
DELISTED
Rite Aid Corporation
RAD
| $170K | ﹤0.01% |
777,300
+300,400
| +63% | +$187K |
|
4830
CALL
Badger Meter
BMI
$3.87B
| $169K | ﹤0.01% |
1,100
+200
| +22% | +$29.1K |
|
4831
CALL
Hudbay
HBM
$9.76B
| $169K | ﹤0.01% |
30,700
-26,600
| -46% | -$125K |
|
4832
CALL
Integra LifeSciences
IART
$1.28B
| $169K | ﹤0.01% |
3,900
+2,900
| +290% | +$114K |
|
4833
PUT
iHeartMedia
IHRT
$531M
| $169K | ﹤0.01% |
63,300
-10,600
| -14% | -$26.8K |
|
4834
PUT
OrthoPediatrics
KIDS
$513M
| $169K | ﹤0.01% |
+5,200
| New | +$151K |
|
4835
PUT
New Fortress Energy
NFE
$92.9M
| $169K | ﹤0.01% |
4,500
-6,400
| -59% | -$221K |
|
|
MTTR
4836
CALL
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $169K | ﹤0.01% |
63,100
-200
| -0.3% | -$481 |
|
4837
CALL
Atlanta Braves Holdings Series B
BATRK
$3.28B
| $168K | ﹤0.01% |
4,000
+2,000
| +100% | +$73K |
|
4838
CALL
OptimizeRx
OPRX
$120M
| $168K | ﹤0.01% |
11,800
+10,300
| +687% | +$98.8K |
|
|
SLNO
4839
DELISTED
Soleno Therapeutics
SLNO
| $168K | ﹤0.01% |
+4,192
| New | +$119K |
|
4840
PUT
Alphatec Holdings
ATEC
$1.48B
| $167K | ﹤0.01% |
11,100
+2,700
| +32% | +$32.3K |
|
|
BLRX
4841
CALL
BioLineRX
BLRX
$12M
| $167K | ﹤0.01% |
2,660
-1,165
| -30% | -$72.1K |
|
4842
CALL
Powell Industries
POWL
$6.79B
| $167K | ﹤0.01% |
5,700
+3,900
| +217% | +$109K |
|
|
TERN
4843
CALL
DELISTED
Terns Pharmaceuticals
TERN
| $167K | ﹤0.01% |
25,800
+1,900
| +8% | +$10K |
|
4844
CALL
Trinity Capital Inc.
TRIN
$1.58B
| $167K | ﹤0.01% |
11,500
-13,300
| -54% | -$191K |
|
4845
CALL
Veeco
VECO
$2.62B
| $167K | ﹤0.01% |
5,400
+1,400
| +35% | +$39K |
|
|
AMRN
4846
CALL
Amarin Corp
AMRN
$297M
| $166K | ﹤0.01% |
9,555
+4,470
| +88% | +$70.2K |
|
4847
PUT
Dorman Products
DORM
$4.22B
| $166K | ﹤0.01% |
+2,000
| New | +$149K |
|
4848
PUT
Genius Sports
GENI
$1.95B
| $166K | ﹤0.01% |
27,000
+19,700
| +270% | +$106K |
|
4849
CALL
Paymentus
PAY
$4.62B
| $166K | ﹤0.01% |
9,300
-3,400
| -27% | -$55.5K |
|
4850
Tidal Trust II Defiance Nasdaq 100 Weekly Distribution ETF
QQQY
$175M
| $166K | ﹤0.01% |
+3,132
| New | +$171K |
|
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.