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 | |
|---|---|---|---|---|---|---|
2251
CALL
Halozyme
HALO
$9.72B
| $2.28M | ﹤0.01% |
61,600
-17,000
| -22% | -$640K |
|
2252
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.2M
| $2.27M | ﹤0.01% |
30,800
-10,400
| -25% | -$747K |
|
2253
PUT
Workiva
WK
$2.94B
| $2.27M | ﹤0.01% |
22,400
+17,100
| +323% | +$1.65M |
|
2254
CALL
Applied Optoelectronics
AAOI
$8.04B
| $2.27M | ﹤0.01% |
117,600
-22,400
| -16% | -$293K |
|
2255
CALL
M/I Homes
MHO
$3.83B
| $2.27M | ﹤0.01% |
16,500
+13,300
| +416% | +$1.33M |
|
|
ETRN
2256
PUT
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
| $2.27M | ﹤0.01% |
222,600
-129,100
| -37% | -$1.21M |
|
2257
PUT
dLocal
DLO
$4.26B
| $2.26M | ﹤0.01% |
128,000
+58,300
| +84% | +$1.04M |
|
2258
CALL
Papa John's
PZZA
$999M
| $2.26M | ﹤0.01% |
29,600
+17,300
| +141% | +$1.18M |
|
2259
British American Tobacco
BTI
$132B
| $2.25M | ﹤0.01% |
76,923
+2,443
| +3% | +$74.3K |
|
2260
CALL
West Pharmaceutical
WST
$23.1B
| $2.25M | ﹤0.01% |
6,400
+1,200
| +23% | +$425K |
|
2261
Frontline
FRO
$8.75B
| $2.25M | ﹤0.01% |
112,186
+67,605
| +152% | +$1.4M |
|
2262
CALL
Perrigo
PRGO
$1.4B
| $2.24M | ﹤0.01% |
69,700
-87,200
| -56% | -$2.61M |
|
|
HTGCR
2263
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $2.24M | ﹤0.01% |
134,500
+24,100
| +22% | +$402K |
|
|
BIG
2264
PUT
DELISTED
Big Lots, Inc.
BIG
| $2.24M | ﹤0.01% |
287,300
+1,100
| +0.4% | +$5.67K |
|
2265
Viatris
VTRS
$20.1B
| $2.24M | ﹤0.01% |
206,580
+46,086
| +29% | +$441K |
|
2266
PUT
EPAM Systems
EPAM
$4.69B
| $2.23M | ﹤0.01% |
7,500
+2,600
| +53% | +$660K |
|
2267
PUT
Aurinia Pharmaceuticals
AUPH
$1.97B
| $2.23M | ﹤0.01% |
247,800
+89,200
| +56% | +$735K |
|
2268
CALL
Churchill Downs
CHDN
$6.03B
| $2.23M | ﹤0.01% |
16,500
+15,100
| +1,079% | +$1.79M |
|
2269
PUT
Brookfield Asset Management
BAM
$74B
| $2.23M | ﹤0.01% |
55,400
+52,200
| +1,631% | +$1.76M |
|
2270
CALL
Cullen/Frost Bankers
CFR
$10.3B
| $2.22M | ﹤0.01% |
20,500
+800
| +4% | +$77.7K |
|
2271
PUT
Brinker International
EAT
$8.02B
| $2.22M | ﹤0.01% |
51,400
+36,900
| +254% | +$1.33M |
|
2272
Rocket Lab Corp
RKLB
$39.9B
| $2.21M | ﹤0.01% |
400,675
+258,251
| +181% | +$1.17M |
|
2273
PUT
Exelixis
EXEL
$13.9B
| $2.21M | ﹤0.01% |
92,200
+49,300
| +115% | +$1.07M |
|
2274
PUT
Universal Health Services
UHS
$9.43B
| $2.21M | ﹤0.01% |
14,500
-9,200
| -39% | -$1.24M |
|
2275
CALL
Fabrinet
FN
$17.1B
| $2.21M | ﹤0.01% |
11,600
-76,400
| -87% | -$13.1M |
|
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.