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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1501
iShares US Home Construction ETF
ITB
$2.41B
| $3.71M | ﹤0.01% |
38,488
-18,225
| -32% | -$1.84M |
|
1502
CALL
Strive Inc
ASST
$961M
| $3.7M | ﹤0.01% |
250,670
+195,740
| +356% | +$4.68M |
|
1503
PUT
Diageo
DEO
$46.2B
| $3.69M | ﹤0.01% |
42,800
+7,300
| +21% | +$672K |
|
1504
PUT
Cenovus Energy
CVE
$54.6B
| $3.69M | ﹤0.01% |
218,200
-94,100
| -30% | -$1.63M |
|
1505
CALL
BJs Wholesale Club
BJ
$11.9B
| $3.69M | ﹤0.01% |
41,000
-5,200
| -11% | -$477K |
|
1506
PUT
Rayonier Advanced Materials
RYAM
$565M
| $3.69M | ﹤0.01% |
626,200
+371,200
| +146% | +$2.41M |
|
1507
Sea Limited
SE
$61.2B
| $3.68M | ﹤0.01% |
+28,880
| New | +$4.28M |
|
1508
CALL
Magna International
MGA
$17.9B
| $3.68M | ﹤0.01% |
69,000
-51,600
| -43% | -$2.52M |
|
|
PONY
1509
CALL
Pony AI Inc
PONY
$3.1B
| $3.67M | ﹤0.01% |
253,100
-242,900
| -49% | -$4.04M |
|
1510
PUT
Shake Shack
SHAK
$2.3B
| $3.67M | ﹤0.01% |
45,200
-20,200
| -31% | -$1.78M |
|
1511
PUT
Globant
GLOB
$1.35B
| $3.67M | ﹤0.01% |
56,100
+53,200
| +1,834% | +$3.34M |
|
1512
CVS Health
CVS
$137B
| $3.66M | ﹤0.01% |
46,171
-2,620
| -5% | -$207K |
|
1513
Stellantis
STLA
$16.5B
| $3.65M | ﹤0.01% |
335,142
-80,124
| -19% | -$862K |
|
1514
PUT
Becton Dickinson
BDX
$43.1B
| $3.65M | ﹤0.01% |
18,800
+13,100
| +230% | +$2.49M |
|
1515
CALL
Align Technology
ALGN
$12B
| $3.64M | ﹤0.01% |
23,300
-7,800
| -25% | -$1.12M |
|
1516
CALL
Chemours
CC
$2.59B
| $3.63M | ﹤0.01% |
308,300
+37,600
| +14% | +$483K |
|
1517
CALL
Southern Copper
SCCO
$141B
| $3.63M | ﹤0.01% |
25,770
-11,622
| -31% | -$1.54M |
|
1518
PUT
Pultegroup
PHM
$24.5B
| $3.62M | ﹤0.01% |
30,900
-45,600
| -60% | -$5.59M |
|
1519
CALL
Valaris
VAL
$5.51B
| $3.61M | ﹤0.01% |
71,700
-17,300
| -19% | -$928K |
|
1520
CALL
Franklin Resources
BEN
$16.9B
| $3.61M | ﹤0.01% |
151,200
-26,200
| -15% | -$602K |
|
1521
CALL
GXO Logistics
GXO
$6.06B
| $3.61M | ﹤0.01% |
68,600
+30,200
| +79% | +$1.59M |
|
1522
CALL
Papa John's
PZZA
$999M
| $3.61M | ﹤0.01% |
93,700
+59,500
| +174% | +$2.63M |
|
1523
Advance Auto Parts
AAP
$3.37B
| $3.61M | ﹤0.01% |
91,753
+29,811
| +48% | +$1.49M |
|
1524
CALL
Sysco
SYY
$39.7B
| $3.6M | ﹤0.01% |
48,900
-11,000
| -18% | -$837K |
|
1525
PUT
Insmed
INSM
$23.2B
| $3.6M | ﹤0.01% |
20,700
-42,400
| -67% | -$7.74M |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.