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 | |
|---|---|---|---|---|---|---|
|
HUT
1351
PUT
Hut 8
HUT
$12.7B
| $6.65M | ﹤0.01% |
498,400
+441,120
| +770% | +$4.71M |
|
1352
CALL
Northern Trust
NTRS
$22.2B
| $6.64M | ﹤0.01% |
78,700
+25,800
| +49% | +$1.91M |
|
|
SEE
1353
PUT
DELISTED
Sealed Air
SEE
| $6.63M | ﹤0.01% |
181,500
+97,300
| +116% | +$3.19M |
|
1354
PUT
Ambarella
AMBA
$2.99B
| $6.57M | ﹤0.01% |
107,200
+19,200
| +22% | +$1.05M |
|
1355
CALL
2x Long VIX Futures ETF
UVIX
$281M
| $6.57M | ﹤0.01% |
1,972
+1,732
| +722% | +$8.79M |
|
1356
CALL
Sempra
SRE
$60.8B
| $6.55M | ﹤0.01% |
87,700
+42,600
| +94% | +$3.05M |
|
1357
Nice
NICE
$5.27B
| $6.54M | ﹤0.01% |
32,798
+10,030
| +44% | +$1.8M |
|
1358
CALL
Public Service Enterprise Group
PEG
$39.8B
| $6.54M | ﹤0.01% |
106,900
+21,400
| +25% | +$1.32M |
|
1359
CALL
Thor Industries
THO
$3.99B
| $6.53M | ﹤0.01% |
55,200
-42,300
| -43% | -$4.23M |
|
|
CTRA
1360
CALL
DELISTED
Coterra Energy
CTRA
| $6.53M | ﹤0.01% |
255,700
+124,700
| +95% | +$3.34M |
|
|
MRTX
1361
CALL
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $6.52M | ﹤0.01% |
111,000
| – | – |
|
1362
PUT
Copart
CPRT
$25.8B
| $6.52M | ﹤0.01% |
133,000
+117,100
| +736% | +$5.53M |
|
1363
PUT
Vodafone
VOD
$35B
| $6.51M | ﹤0.01% |
748,600
+135,200
| +22% | +$1.24M |
|
1364
CALL
Helen of Troy
HELE
$658M
| $6.51M | ﹤0.01% |
53,900
+6,100
| +13% | +$657K |
|
1365
PUT
Aflac
AFL
$63.6B
| $6.5M | ﹤0.01% |
78,800
-9,500
| -11% | -$766K |
|
1366
CALL
Revvity
RVTY
$12.4B
| $6.48M | ﹤0.01% |
59,300
+53,800
| +978% | +$5.19M |
|
1367
Li Auto
LI
$12.7B
| $6.47M | ﹤0.01% |
+172,996
| New | +$6.24M |
|
1368
CALL
Annaly Capital Management
NLY
$16.8B
| $6.47M | ﹤0.01% |
334,200
-73,100
| -18% | -$1.3M |
|
1369
CALL
Middleby
MIDD
$6.05B
| $6.46M | ﹤0.01% |
43,900
+29,600
| +207% | +$3.76M |
|
1370
CALL
Camping World
CWH
$360M
| $6.45M | ﹤0.01% |
245,600
+133,600
| +119% | +$2.8M |
|
1371
CALL
Constellation Energy
CEG
$98.5B
| $6.44M | ﹤0.01% |
55,100
+26,800
| +95% | +$3.13M |
|
1372
CALL
Viking Therapeutics
VKTX
$4.05B
| $6.43M | ﹤0.01% |
345,700
-162,300
| -32% | -$2.12M |
|
1373
PUT
Meritage Homes
MTH
$4.86B
| $6.43M | ﹤0.01% |
73,800
-43,800
| -37% | -$3.02M |
|
1374
CALL
Agilent Technologies
A
$39.2B
| $6.41M | ﹤0.01% |
46,100
-9,100
| -16% | -$1.08M |
|
1375
PUT
Lucid Motors
LCID
$2.42B
| $6.37M | ﹤0.01% |
151,420
-6,940
| -4% | -$312K |
|
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.