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 | |
|---|---|---|---|---|---|---|
5101
PUT
Heritage Insurance Holdings
HRTG
$884M
| $131K | ﹤0.01% |
20,200
+18,800
| +1,343% | +$130K |
|
5102
PUT
Ichor Holdings
ICHR
$2.66B
| $131K | ﹤0.01% |
3,900
+3,400
| +680% | +$94.1K |
|
|
LNW
5103
PUT
DELISTED
Light & Wonder
LNW
| $131K | ﹤0.01% |
1,600
-11,000
| -87% | -$883K |
|
5104
Targa Resources
TRGP
$58B
| $131K | ﹤0.01% |
1,517
-8,706
| -85% | -$748K |
|
5105
Alignment Healthcare
ALHC
$3.14B
| $130K | ﹤0.01% |
15,112
+14,752
| +4,098% | +$108K |
|
|
ARBK
5106
Argo Blockchain
ARBK
$41.6M
| $130K | ﹤0.01% |
162
+94
| +138% | +$30.3K |
|
5107
Global X Copper Miners ETF NEW
COPX
$7.28B
| $130K | ﹤0.01% |
3,475
+2,297
| +195% | +$79.9K |
|
5108
CALL
Gentex
GNTX
$4.99B
| $130K | ﹤0.01% |
4,000
+2,000
| +100% | +$61.8K |
|
5109
CALL
Gates Industrial Corporation Ltd.
GTES
$7.18B
| $130K | ﹤0.01% |
9,700
+500
| +5% | +$5.91K |
|
5110
PUT
Par Pacific Holdings
PARR
$4.3B
| $130K | ﹤0.01% |
3,600
+600
| +20% | +$20.2K |
|
5111
PUT
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$255M
| $130K | ﹤0.01% |
8,100
+4,000
| +98% | +$46.3K |
|
|
SILK
5112
CALL
DELISTED
Silk Road Medical, Inc. Common Stock
SILK
| $130K | ﹤0.01% |
10,600
-7,900
| -43% | -$74.1K |
|
|
ESMT
5113
CALL
DELISTED
EngageSmart, Inc.
ESMT
| $130K | ﹤0.01% |
5,700
-1,600
| -22% | -$35.5K |
|
5114
CALL
Amcor
AMCR
$20.7B
| $129K | ﹤0.01% |
2,680
-80
| -3% | -$3.67K |
|
5115
CALL
Eastern Bankshares
EBC
$5.26B
| $129K | ﹤0.01% |
9,100
-7,900
| -46% | -$98.7K |
|
5116
PUT
EVgo
EVGO
$221M
| $129K | ﹤0.01% |
36,200
-34,600
| -49% | -$102K |
|
5117
CALL
Kopin
KOPN
$656M
| $129K | ﹤0.01% |
63,900
+11,900
| +23% | +$17K |
|
5118
PUT
Lindsay Corp
LNN
$1.13B
| $129K | ﹤0.01% |
+1,000
| New | +$123K |
|
5119
PUT
nVent Electric
NVT
$25.2B
| $129K | ﹤0.01% |
2,200
-9,200
| -81% | -$488K |
|
|
GTHX
5120
PUT
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $129K | ﹤0.01% |
+42,600
| New | +$80K |
|
5121
PUT
Fox Factory Holding Corp
FOXF
$751M
| $128K | ﹤0.01% |
1,900
-3,300
| -63% | -$241K |
|
5122
PUT
GoPro
GPRO
$129M
| $128K | ﹤0.01% |
37,000
+31,000
| +517% | +$98.3K |
|
5123
H&R Block
HRB
$5.59B
| $128K | ﹤0.01% |
2,666
-19,845
| -88% | -$885K |
|
5124
iShares Global Tech ETF
IXN
$8.34B
| $128K | ﹤0.01% |
1,885
+1,219
| +183% | +$76.7K |
|
5125
CALL
PRA Group
PRAA
$662M
| $128K | ﹤0.01% |
4,900
+300
| +7% | +$5.61K |
|
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.