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 | |
|---|---|---|---|---|---|---|
5301
Kura Oncology
KURA
$800M
| $108K | ﹤0.01% |
7,545
+7,330
| +3,409% | +$72.1K |
|
5302
PUT
Oshkosh
OSK
$8.79B
| $108K | ﹤0.01% |
1,000
-4,000
| -80% | -$387K |
|
5303
CALL
Titan International
TWI
$466M
| $108K | ﹤0.01% |
7,300
+4,000
| +121% | +$52.7K |
|
|
VTYX
5304
CALL
DELISTED
Ventyx Biosciences
VTYX
| $108K | ﹤0.01% |
43,800
+42,400
| +3,029% | +$403K |
|
|
LLAP
5305
DELISTED
Terran Orbital Corporation
LLAP
| $108K | ﹤0.01% |
94,998
+61,065
| +180% | +$51K |
|
|
MDRX
5306
DELISTED
Veradigm Inc. Common Stock
MDRX
| $108K | ﹤0.01% |
10,303
+4,007
| +64% | +$49.1K |
|
5307
Cirrus Logic
CRUS
$6.53B
| $107K | ﹤0.01% |
+1,287
| New | +$96.4K |
|
5308
8x8 Inc
EGHT
$269M
| $107K | ﹤0.01% |
+28,439
| New | +$84.4K |
|
5309
Amplify Cybersecurity ETF
HACK
$2.68B
| $107K | ﹤0.01% |
+1,784
| New | +$98.1K |
|
5310
Kite Realty
KRG
$5.81B
| $107K | ﹤0.01% |
4,695
+2,721
| +138% | +$58.1K |
|
5311
Maximus
MMS
$3.17B
| $107K | ﹤0.01% |
1,284
+1,234
| +2,468% | +$98.4K |
|
5312
CALL
NextNav
NN
$1.79B
| $107K | ﹤0.01% |
24,200
+22,800
| +1,629% | +$103K |
|
5313
CALL
PDS Biotechnology
PDSB
$38.4M
| $107K | ﹤0.01% |
21,700
-4,000
| -16% | -$19.9K |
|
5314
CALL
RAVE Restaurant Group
RAVE
$44.8M
| $107K | ﹤0.01% |
48,100
+28,600
| +147% | +$65.1K |
|
5315
PUT
Rogers Communications
RCI
$18.3B
| $107K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$91.7K |
|
5316
Ryanair
RYAAY
$30.4B
| $107K | ﹤0.01% |
+2,008
| New | +$88.2K |
|
5317
CALL
Spruce Power Holding Corp
SPRU
$35.8M
| $107K | ﹤0.01% |
24,300
+21,250
| +697% | +$88.9K |
|
5318
PUT
Teekay
TK
$1.01B
| $107K | ﹤0.01% |
15,000
+12,300
| +456% | +$84.9K |
|
5319
PUT
Vir Biotechnology
VIR
$1.46B
| $107K | ﹤0.01% |
10,700
+6,300
| +143% | +$57.6K |
|
5320
CALL
Global X S&P 500 Tail Risk ETF
XTR
$4.8M
| $107K | ﹤0.01% |
3,800
+900
| +31% | +$23.1K |
|
|
DAY
5321
CALL
DELISTED
Dayforce
DAY
| $107K | ﹤0.01% |
114,900
+38,500
| +50% | +$2.63M |
|
|
SOVO
5322
PUT
DELISTED
Sovos Brands, Inc. Common Stock
SOVO
| $107K | ﹤0.01% |
4,900
-200
| -4% | -$4.4K |
|
5323
CALL
Blend Labs
BLND
$431M
| $106K | ﹤0.01% |
41,900
+24,900
| +146% | +$37.6K |
|
|
CADE
5324
CALL
DELISTED
Cadence Bank
CADE
| $106K | ﹤0.01% |
3,600
+3,500
| +3,500% | +$85.4K |
|
5325
CALL
Goosehead Insurance
GSHD
$2.2B
| $106K | ﹤0.01% |
1,400
-1,600
| -53% | -$116K |
|
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.