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 | |
|---|---|---|---|---|---|---|
5276
CALL
Immatics
IMTX
$1.18B
| $110K | ﹤0.01% |
10,500
-30,700
| -75% | -$283K |
|
5277
iShares S&P India Nifty 50 Index Fund
INDY
$562M
| $110K | ﹤0.01% |
2,240
+1,954
| +683% | +$90.2K |
|
5278
Mitsubishi UFJ Financial
MUFG
$253B
| $110K | ﹤0.01% |
12,813
+3,603
| +39% | +$30.4K |
|
5279
PUT
Outfront Media
OUT
$5.61B
| $110K | ﹤0.01% |
8,026
+7,416
| +1,216% | +$83.8K |
|
5280
CorMedix
CRMD
$591M
| $109K | ﹤0.01% |
29,186
-42,277
| -59% | -$145K |
|
5281
CALL
Dine Brands
DIN
$456M
| $109K | ﹤0.01% |
2,200
+1,700
| +340% | +$80.7K |
|
5282
CALL
Deluxe
DLX
$1.18B
| $109K | ﹤0.01% |
5,100
-2,400
| -32% | -$44.7K |
|
|
DRRX
5283
CALL
DELISTED
DURECT Corp
DRRX
| $109K | ﹤0.01% |
184,800
-8,700
| -4% | -$12.4K |
|
5284
PUT
Essential Properties Realty Trust
EPRT
$6.77B
| $109K | ﹤0.01% |
4,300
+1,300
| +43% | +$30.1K |
|
5285
PUT
National Beverage
FIZZ
$2.96B
| $109K | ﹤0.01% |
2,200
-5,300
| -71% | -$254K |
|
5286
CALL
Griffon
GFF
$3.95B
| $109K | ﹤0.01% |
1,800
+1,500
| +500% | +$69.3K |
|
5287
CALL
Limoneira
LMNR
$235M
| $109K | ﹤0.01% |
+5,300
| New | +$85.7K |
|
5288
CALL
Mirum Pharmaceuticals
MIRM
$6.46B
| $109K | ﹤0.01% |
3,700
-5,000
| -57% | -$151K |
|
5289
CALL
National CineMedia
NCMI
$376M
| $109K | ﹤0.01% |
26,500
-5,400
| -17% | -$21.8K |
|
5290
CALL
Preferred Bank
PFBC
$1.24B
| $109K | ﹤0.01% |
+1,500
| New | +$97.7K |
|
5291
CALL
Pagaya Technologies
PGY
$1.61B
| $109K | ﹤0.01% |
6,583
-7,267
| -52% | -$118K |
|
|
SCPH
5292
CALL
DELISTED
scPharmaceuticals
SCPH
| $109K | ﹤0.01% |
17,400
-10,500
| -38% | -$60.1K |
|
|
SEMR
5293
PUT
DELISTED
Semrush
SEMR
| $109K | ﹤0.01% |
8,000
+1,500
| +23% | +$14.8K |
|
|
SVC
5294
PUT
Service Properties Trust
SVC
$1.04B
| $109K | ﹤0.01% |
2,560
-3,840
| -60% | -$145K |
|
|
SVM
5295
CALL
Silvercorp Metals
SVM
$2.07B
| $109K | ﹤0.01% |
41,800
+15,500
| +59% | +$38K |
|
5296
PUT
Sypris Solutions
SYPR
$42.8M
| $109K | ﹤0.01% |
54,000
-6,500
| -11% | -$12.6K |
|
|
AMAM
5297
DELISTED
Ambrx Biopharma Inc
AMAM
| $109K | ﹤0.01% |
7,657
-60,894
| -89% | -$692K |
|
5298
Adtran
ADTN
$689M
| $108K | ﹤0.01% |
14,819
+11,266
| +317% | +$74.3K |
|
5299
CALL
Advanced Energy
AEIS
$11.6B
| $108K | ﹤0.01% |
1,000
-5,900
| -86% | -$574K |
|
5300
CALL
Funko
FNKO
$326M
| $108K | ﹤0.01% |
14,000
+1,200
| +9% | +$8.67K |
|
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.