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 | |
|---|---|---|---|---|---|---|
6276
CALL
Ondas Inc
ONDS
$3.87B
| $41K | ﹤0.01% |
26,900
+24,300
| +935% | +$21K |
|
6277
Stoke Therapeutics
STOK
$1.84B
| $41K | ﹤0.01% |
7,979
+5,298
| +198% | +$22.6K |
|
6278
PUT
Expro Ltd
XPRO
$1.64B
| $41K | ﹤0.01% |
2,600
+2,100
| +420% | +$36.2K |
|
|
TXNM
6279
CALL
TXNM Energy Inc
TXNM
$6.39B
| $41K | ﹤0.01% |
+1,000
| New | +$42.8K |
|
|
WKME
6280
PUT
DELISTED
WalkMe Ltd. Ordinary Shares
WKME
| $41K | ﹤0.01% |
+3,900
| New | +$36.7K |
|
6281
PUT
Adicet Bio
ACET
$77.6M
| $40K | ﹤0.01% |
1,344
| – | – |
|
6282
Ardagh Metal Packaging
AMBP
$2.96B
| $40K | ﹤0.01% |
10,560
-12,228
| -54% | -$42.5K |
|
|
LONA
6283
CALL
LeonaBio Inc
LONA
$66.1M
| $40K | ﹤0.01% |
1,650
-40
| -2% | -$709 |
|
6284
PUT
Cemex
CX
$16.9B
| $40K | ﹤0.01% |
5,200
-9,700
| -65% | -$65.9K |
|
|
EWCZ
6285
PUT
DELISTED
European Wax Center
EWCZ
| $40K | ﹤0.01% |
+3,000
| New | +$43.5K |
|
6286
PUT
Full House Resorts
FLL
$83.4M
| $40K | ﹤0.01% |
+7,500
| New | +$35.2K |
|
|
GPMT
6287
PUT
Granite Point Mortgage Trust
GPMT
$63.7M
| $40K | ﹤0.01% |
6,900
+4,500
| +188% | +$22.7K |
|
6288
Hyliion Holdings
HYLN
$578M
| $40K | ﹤0.01% |
49,301
+37,157
| +306% | +$26.4K |
|
6289
PUT
Kratos Defense & Security Solutions
KTOS
$8.23B
| $40K | ﹤0.01% |
2,000
+300
| +18% | +$5.51K |
|
6290
PUT
LiveWire
LVWR
$530M
| $40K | ﹤0.01% |
3,600
-2,400
| -40% | -$23.5K |
|
6291
CALL
MasterBrand
MBC
$1.09B
| $40K | ﹤0.01% |
+2,700
| New | +$34.6K |
|
|
MITT
6292
TPG Mortgage Investment Trust
MITT
$228M
| $40K | ﹤0.01% |
6,317
-21,703
| -77% | -$118K |
|
6293
Global X MLP ETF
MLPA
$2.26B
| $40K | ﹤0.01% |
915
+411
| +82% | +$18.3K |
|
|
NAAS
6294
PUT
NaaS Technology Inc
NAAS
$54.7M
| $40K | ﹤0.01% |
83
+67
| +419% | +$54.6K |
|
|
PLYM
6295
PUT
DELISTED
Plymouth Industrial REIT
PLYM
| $40K | ﹤0.01% |
+1,700
| New | +$37K |
|
6296
QuinStreet
QNST
$927M
| $40K | ﹤0.01% |
3,191
+2,216
| +227% | +$25K |
|
6297
CALL
RCM Technologies
RCMT
$202M
| $40K | ﹤0.01% |
1,400
-2,400
| -63% | -$56.3K |
|
6298
CALL
Relay Therapeutics
RLAY
$4B
| $40K | ﹤0.01% |
3,700
+1,000
| +37% | +$8.44K |
|
|
SKE
6299
CALL
Skeena Resources
SKE
$3.19B
| $40K | ﹤0.01% |
8,300
+900
| +12% | +$3.79K |
|
6300
Scholar Rock
SRRK
$5.88B
| $40K | ﹤0.01% |
+2,132
| New | +$26.5K |
|
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.