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 | |
|---|---|---|---|---|---|---|
|
TGB
6051
PUT
Trekor Metals
TGB
$2.45B
| $52K | ﹤0.01% |
37,500
+25,000
| +200% | +$30.7K |
|
|
KLRS
6052
CALL
Kalaris Therapeutics
KLRS
$80.9M
| $52K | ﹤0.01% |
3,357
+3,266
| +3,589% | +$129K |
|
6053
PUT
Arch Capital
ACGL
$35.7B
| $51K | ﹤0.01% |
700
-11,100
| -94% | -$907K |
|
6054
Addus HomeCare
ADUS
$2.22B
| $51K | ﹤0.01% |
+555
| New | +$48.3K |
|
6055
PUT
Corporacion America
CAAP
$4.17B
| $51K | ﹤0.01% |
3,200
+3,100
| +3,100% | +$41K |
|
6056
Invesco DB Oil Fund
DBO
$401M
| $51K | ﹤0.01% |
+3,675
| New | +$58.3K |
|
6057
PUT
Ethan Allen Interiors
ETD
$600M
| $51K | ﹤0.01% |
1,600
-13,900
| -90% | -$399K |
|
6058
CALL
Fathom Holdings
FTHM
$26.4M
| $51K | ﹤0.01% |
+14,300
| New | +$45.5K |
|
6059
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$73M
| $51K | ﹤0.01% |
700
-5,000
| -88% | -$359K |
|
|
MCHB
6060
CALL
Mechanics Bancorp
MCHB
$3.65B
| $51K | ﹤0.01% |
5,000
-5,100
| -50% | -$35.3K |
|
6061
CALL
Outset Medical
OM
$86.4M
| $51K | ﹤0.01% |
633
-187
| -23% | -$15.2K |
|
6062
CALL
Rogers Communications
RCI
$18.8B
| $51K | ﹤0.01% |
1,100
-1,600
| -59% | -$66.7K |
|
6063
State Street SPDR S&P Dividend ETF
SDY
$22.1B
| $51K | ﹤0.01% |
416
-653
| -61% | -$76.7K |
|
6064
CALL
Wheels Up
UP
$203M
| $51K | ﹤0.01% |
845
+150
| +22% | +$5.8K |
|
6065
CALL
Vuzix
VUZI
$178M
| $51K | ﹤0.01% |
24,600
-9,900
| -29% | -$27K |
|
|
BIOR
6066
PUT
DELISTED
Biora Therapeutics, Inc. Common Stock
BIOR
| $51K | ﹤0.01% |
4,600
-30
| -0.6% | -$486 |
|
6067
AudioCodes
AUDC
$239M
| $50K | ﹤0.01% |
4,192
+4,143
| +8,455% | +$42.4K |
|
|
DADA
6068
CALL
DELISTED
Dada Nexus
DADA
| $50K | ﹤0.01% |
15,300
+800
| +6% | +$2.95K |
|
6069
PUT
EnerSys
ENS
$6.43B
| $50K | ﹤0.01% |
500
+400
| +400% | +$36.8K |
|
6070
CALL
Genmab
GMAB
$17.5B
| $50K | ﹤0.01% |
1,600
-4,400
| -73% | -$138K |
|
6071
CALL
Goldman Sachs ActiveBeta International Equity ETF
GSIE
$5.9B
| $50K | ﹤0.01% |
+600
| New | +$18.4K |
|
6072
CALL
Granite Construction
GVA
$5.16B
| $50K | ﹤0.01% |
1,000
-400
| -29% | -$17.4K |
|
6073
PUT
Harmonic Inc
HLIT
$1.15B
| $50K | ﹤0.01% |
3,900
+1,600
| +70% | +$17.1K |
|
6074
Immatics
IMTX
$1.23B
| $50K | ﹤0.01% |
+4,787
| New | +$44.1K |
|
6075
CALL
Microvast
MVST
$237M
| $50K | ﹤0.01% |
36,200
-4,100
| -10% | -$5.5K |
|
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.