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 | |
|---|---|---|---|---|---|---|
5326
CALL
LSB Industries
LXU
$783M
| $106K | ﹤0.01% |
11,400
-2,800
| -20% | -$25.5K |
|
|
SJT
5327
CALL
San Juan Basin Royalty Trust
SJT
$117M
| $106K | ﹤0.01% |
20,900
+12,500
| +149% | +$83.6K |
|
|
SRG
5328
PUT
Seritage Growth Properties
SRG
$136M
| $106K | ﹤0.01% |
11,400
-71,400
| -86% | -$600K |
|
|
TRTX
5329
CALL
TPG RE Finance Trust
TRTX
$612M
| $106K | ﹤0.01% |
16,400
-1,300
| -7% | -$7.84K |
|
5330
Vuzix
VUZI
$194M
| $106K | ﹤0.01% |
50,941
+27,740
| +120% | +$75.6K |
|
|
LEV
5331
PUT
DELISTED
The Lion Electric Company
LEV
| $106K | ﹤0.01% |
60,400
-2,300
| -4% | -$4K |
|
|
PETQ
5332
CALL
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $106K | ﹤0.01% |
5,400
-12,400
| -70% | -$238K |
|
|
IBTX
5333
CALL
DELISTED
Independent Bank Group, Inc.
IBTX
| $106K | ﹤0.01% |
+2,100
| New | +$85.2K |
|
|
CIM
5334
PUT
Chimera Investment
CIM
$1.04B
| $105K | ﹤0.01% |
7,067
-1,100
| -13% | -$16.6K |
|
5335
CALL
LifeVantage
LFVN
$81.1M
| $105K | ﹤0.01% |
17,600
| – | – |
|
5336
CALL
Envista
NVST
$4.44B
| $105K | ﹤0.01% |
4,400
-2,700
| -38% | -$64.5K |
|
5337
PUT
Western Midstream Partners
WES
$19.2B
| $105K | ﹤0.01% |
3,600
+200
| +6% | +$5.59K |
|
|
KNTE
5338
DELISTED
Kinnate Biopharma Inc. Common Stock
KNTE
| $105K | ﹤0.01% |
+44,339
| New | +$78.5K |
|
5339
CALL
Allison Transmission
ALSN
$9.5B
| $104K | ﹤0.01% |
1,800
-18,500
| -91% | -$1.03M |
|
5340
CALL
ALX Oncology
ALXO
$261M
| $104K | ﹤0.01% |
+7,000
| New | +$66.4K |
|
5341
Andersons Inc
ANDE
$2.41B
| $104K | ﹤0.01% |
1,820
+1,472
| +423% | +$76.4K |
|
5342
PUT
Calix
CALX
$2.26B
| $104K | ﹤0.01% |
2,400
-5,100
| -68% | -$204K |
|
5343
ProShares UltraShort Dow 30
DXD
$42.2M
| $104K | ﹤0.01% |
+3,078
| New | +$123K |
|
5344
PUT
Eve Holding
EVEX
$808M
| $104K | ﹤0.01% |
14,300
-23,800
| -62% | -$176K |
|
5345
CALL
Golub Capital BDC
GBDC
$3.34B
| $104K | ﹤0.01% |
6,900
+3,500
| +103% | +$51.5K |
|
5346
iShares US Oil & Gas Exploration & Production ETF
IEO
$580M
| $104K | ﹤0.01% |
1,118
-3,973
| -78% | -$377K |
|
5347
Leidos
LDOS
$14.5B
| $104K | ﹤0.01% |
+964
| New | +$98.2K |
|
5348
CALL
MiMedx Group
MDXG
$602M
| $104K | ﹤0.01% |
11,900
-10,100
| -46% | -$74K |
|
|
MTLS
5349
CALL
Materialise
MTLS
$368M
| $104K | ﹤0.01% |
15,900
-7,000
| -31% | -$41.3K |
|
|
NVNO
5350
CALL
enVVeno Medical
NVNO
$7.08M
| $104K | ﹤0.01% |
583
+243
| +71% | +$38.7K |
|
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.