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 | |
|---|---|---|---|---|---|---|
3326
Advanced Drainage Systems
WMS
$10.9B
| $733K | ﹤0.01% |
5,218
+4,034
| +341% | +$486K |
|
3327
Altimmune
ALT
$568M
| $732K | ﹤0.01% |
65,131
-3,867
| -6% | -$16.1K |
|
3328
Vanguard Mega Cap Growth ETF
MGK
$31.7B
| $732K | ﹤0.01% |
+14,110
| New | +$685K |
|
3329
CALL
Veralto
VLTO
$23.1B
| $732K | ﹤0.01% |
+8,900
| New | +$665K |
|
3330
CALL
Customers Bancorp
CUBI
$2.66B
| $731K | ﹤0.01% |
12,700
-20,100
| -61% | -$872K |
|
3331
SSR Mining
SSRM
$5.46B
| $731K | ﹤0.01% |
67,991
+41,934
| +161% | +$509K |
|
3332
CAVA Group
CAVA
$7.47B
| $730K | ﹤0.01% |
+16,992
| New | +$592K |
|
|
AZUL
3333
PUT
DELISTED
Azul
AZUL
| $729K | ﹤0.01% |
75,300
-22,400
| -23% | -$204K |
|
3334
CALL
MakeMyTrip
MMYT
$4.93B
| $728K | ﹤0.01% |
15,500
+2,600
| +20% | +$110K |
|
3335
CALL
Mine Safety
MSA
$6.73B
| $725K | ﹤0.01% |
4,300
+3,900
| +975% | +$634K |
|
3336
CALL
Murphy Oil
MUR
$5.42B
| $725K | ﹤0.01% |
17,000
+9,700
| +133% | +$425K |
|
3337
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$7.85B
| $724K | ﹤0.01% |
+18,500
| New | +$477K |
|
3338
CALL
Ecopetrol
EC
$32.3B
| $722K | ﹤0.01% |
60,600
-7,000
| -10% | -$84.9K |
|
3339
CALL
First Financial Bancorp
FFBC
$3.54B
| $722K | ﹤0.01% |
30,400
+1,900
| +7% | +$39.4K |
|
3340
Innoviz Technologies
INVZ
$136M
| $721K | ﹤0.01% |
285,373
+276,219
| +3,017% | +$529K |
|
3341
CALL
Texas Roadhouse
TXRH
$13.2B
| $721K | ﹤0.01% |
5,900
-24,400
| -81% | -$2.61M |
|
3342
Pitney Bowes
PBI
$2.46B
| $720K | ﹤0.01% |
163,806
+136,168
| +493% | +$528K |
|
3343
PUT
Essex Property Trust
ESS
$18.7B
| $719K | ﹤0.01% |
2,900
+800
| +38% | +$176K |
|
3344
PUT
Evercore
EVR
$13B
| $718K | ﹤0.01% |
4,200
-6,500
| -61% | -$941K |
|
3345
CALL
Globe Life
GL
$13.5B
| $718K | ﹤0.01% |
5,900
+5,800
| +5,800% | +$682K |
|
3346
Innovative Industrial Properties
IIPR
$1.79B
| $718K | ﹤0.01% |
7,126
-5,135
| -42% | -$421K |
|
|
SBDS
3347
PUT
DELISTED
Solo Brands Inc
SBDS
| $717K | ﹤0.01% |
2,910
-43
| -1% | -$8.38K |
|
3348
PUT
Packaging Corp of America
PKG
$22.4B
| $716K | ﹤0.01% |
4,400
+100
| +2% | +$15.7K |
|
|
VERV
3349
PUT
DELISTED
Verve Therapeutics
VERV
| $716K | ﹤0.01% |
51,400
+50,700
| +7,243% | +$628K |
|
|
GOOS
3350
PUT
Canada Goose Holdings
GOOS
$879M
| $715K | ﹤0.01% |
60,400
+48,800
| +421% | +$577K |
|
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.