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 | |
|---|---|---|---|---|---|---|
4876
XPEL
XPEL
$1.22B
| $163K | ﹤0.01% |
+3,040
| New | +$163K |
|
4877
CALL
Autohome
ATHM
$2.62B
| $162K | ﹤0.01% |
5,800
+2,400
| +71% | +$66K |
|
4878
Diodes
DIOD
$3.5B
| $162K | ﹤0.01% |
+2,013
| New | +$147K |
|
4879
CALL
IMAX
IMAX
$2.67B
| $162K | ﹤0.01% |
10,800
-38,300
| -78% | -$655K |
|
4880
CALL
Innodata
INOD
$1.81B
| $162K | ﹤0.01% |
20,000
+900
| +5% | +$7.13K |
|
4881
CALL
PetMed Express
PETS
$42.3M
| $162K | ﹤0.01% |
21,500
+4,500
| +26% | +$37K |
|
4882
CALL
Sylvamo
SLVM
$1.52B
| $162K | ﹤0.01% |
3,300
-24,400
| -88% | -$1.14M |
|
4883
PUT
Travere Therapeutics
TVTX
$5.17B
| $162K | ﹤0.01% |
18,100
-41,200
| -69% | -$300K |
|
4884
Equity Lifestyle Properties
ELS
$13.1B
| $161K | ﹤0.01% |
2,284
+2,083
| +1,036% | +$142K |
|
4885
Invesco
IVZ
$12.4B
| $161K | ﹤0.01% |
+9,040
| New | +$130K |
|
4886
PUT
Otter Tail
OTTR
$3.81B
| $161K | ﹤0.01% |
1,900
+1,000
| +111% | +$77.2K |
|
4887
Ouster
OUST
$2.11B
| $161K | ﹤0.01% |
21,105
+6,239
| +42% | +$32.7K |
|
|
SAGE
4888
DELISTED
Sage Therapeutics
SAGE
| $161K | ﹤0.01% |
+7,455
| New | +$148K |
|
4889
Champion Homes
SKY
$4.41B
| $161K | ﹤0.01% |
2,176
-7,047
| -76% | -$443K |
|
4890
CALL
WPP
WPP
$4.67B
| $161K | ﹤0.01% |
3,400
-900
| -21% | -$40.3K |
|
4891
PUT
Funko
FNKO
$346M
| $160K | ﹤0.01% |
20,700
-17,800
| -46% | -$129K |
|
|
HDSN
4892
PUT
Hudson Technologies
HDSN
$246M
| $160K | ﹤0.01% |
11,900
-21,200
| -64% | -$274K |
|
4893
PUT
Imperial Oil
IMO
$62.3B
| $160K | ﹤0.01% |
2,800
+2,200
| +367% | +$126K |
|
4894
CALL
Mueller Industries
MLI
$14.5B
| $160K | ﹤0.01% |
6,800
-2,800
| -29% | -$56.5K |
|
|
SAND
4895
DELISTED
Sandstorm Gold
SAND
| $160K | ﹤0.01% |
+31,824
| New | +$152K |
|
|
SHCO
4896
PUT
DELISTED
Soho House & Co
SHCO
| $160K | ﹤0.01% |
22,600
+17,800
| +371% | +$125K |
|
4897
Tarsus Pharmaceuticals
TARS
$2.55B
| $160K | ﹤0.01% |
+7,918
| New | +$132K |
|
4898
PUT
Global X S&P 500 Tail Risk ETF
XTR
$4.71M
| $160K | ﹤0.01% |
3,200
-200
| -6% | -$5.13K |
|
|
DOOR
4899
PUT
DELISTED
MASONITE INTERNATIONAL CORP
DOOR
| $160K | ﹤0.01% |
1,900
+1,800
| +1,800% | +$156K |
|
|
DADA
4900
DELISTED
Dada Nexus
DADA
| $159K | ﹤0.01% |
48,068
+11,172
| +30% | +$41.2K |
|
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.