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 | |
|---|---|---|---|---|---|---|
2301
Edwards Lifesciences
EW
$47.6B
| $2.13M | ﹤0.01% |
+27,983
| New | +$1.95M |
|
2302
PUT
Hormel Foods
HRL
$13.9B
| $2.13M | ﹤0.01% |
66,300
-19,700
| -23% | -$643K |
|
2303
CALL
DoubleVerify
DV
$1.62B
| $2.13M | ﹤0.01% |
57,800
+49,500
| +596% | +$1.54M |
|
2304
MoonLake Immunotherapeutics
MLTX
$1.59B
| $2.12M | ﹤0.01% |
+35,179
| New | +$1.81M |
|
2305
CALL
Ramaco Resources Class A
METC
$676M
| $2.12M | ﹤0.01% |
127,752
+126,718
| +12,255% | +$1.76M |
|
2306
Waste Management
WM
$95.9B
| $2.12M | ﹤0.01% |
11,848
-61,743
| -84% | -$10.4M |
|
2307
CALL
Ironwood Pharmaceuticals
IRWD
$611M
| $2.12M | ﹤0.01% |
185,400
+184,200
| +15,350% | +$1.82M |
|
2308
PUT
Lamar Advertising Co
LAMR
$16.2B
| $2.11M | ﹤0.01% |
19,900
-15,100
| -43% | -$1.42M |
|
2309
Ball Corp
BALL
$17B
| $2.11M | ﹤0.01% |
+36,711
| New | +$1.89M |
|
2310
PUT
Bio-Techne
TECH
$11.2B
| $2.11M | ﹤0.01% |
27,300
+2,200
| +9% | +$145K |
|
2311
PUT
Agilon Health
AGL
$1.64B
| $2.1M | ﹤0.01% |
6,704
+4,088
| +156% | +$1.48M |
|
2312
CALL
Stem
STEM
$49.2M
| $2.1M | ﹤0.01% |
27,050
+3,595
| +15% | +$248K |
|
2313
CALL
Immunocore
IMCR
$1.78B
| $2.1M | ﹤0.01% |
30,700
+23,100
| +304% | +$1.2M |
|
2314
CALL
Paysafe
PSFE
$407M
| $2.1M | ﹤0.01% |
164,000
+62,200
| +61% | +$687K |
|
2315
PUT
Republic Services
RSG
$66.7B
| $2.09M | ﹤0.01% |
12,700
-36,600
| -74% | -$5.68M |
|
2316
Brunswick
BC
$5.19B
| $2.09M | ﹤0.01% |
21,625
+15,181
| +236% | +$1.21M |
|
2317
Penumbra
PEN
$12.5B
| $2.09M | ﹤0.01% |
8,311
+2,060
| +33% | +$455K |
|
2318
Marriott International
MAR
$98.7B
| $2.09M | ﹤0.01% |
+9,260
| New | +$1.88M |
|
2319
CALL
RB Global
RBA
$20.8B
| $2.09M | ﹤0.01% |
31,400
-11,600
| -27% | -$745K |
|
2320
PUT
Under Armour Class C
UA
$2.92B
| $2.09M | ﹤0.01% |
238,300
-41,800
| -15% | -$302K |
|
2321
PUT
Alliant Energy
LNT
$19.4B
| $2.08M | ﹤0.01% |
40,600
-84,800
| -68% | -$4.23M |
|
2322
CALL
Tanger
SKT
$4.82B
| $2.08M | ﹤0.01% |
75,000
-27,400
| -27% | -$682K |
|
|
SNCY
2323
DELISTED
Sun Country Airlines
SNCY
| $2.08M | ﹤0.01% |
132,189
+24,097
| +22% | +$355K |
|
2324
CALL
Credit Acceptance
CACC
$6B
| $2.08M | ﹤0.01% |
3,900
+1,800
| +86% | +$809K |
|
2325
PUT
USA Compression Partners
USAC
$3.82B
| $2.08M | ﹤0.01% |
91,000
+50,900
| +127% | +$1.26M |
|
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.