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 | |
|---|---|---|---|---|---|---|
1651
Dick's Sporting Goods
DKS
$18.4B
| $3.04M | ﹤0.01% |
15,353
-7,713
| -33% | -$1.68M |
|
|
FITB
1652
PUT
Fifth Third Bancorp
FITB
$52B
| $3.02M | ﹤0.01% |
64,600
-45,600
| -41% | -$2.01M |
|
1653
PUT
Sphere Entertainment
SPHR
$4.88B
| $3.02M | ﹤0.01% |
31,800
-157,800
| -83% | -$12M |
|
1654
CALL
Krispy Kreme
DNUT
$543M
| $3.02M | ﹤0.01% |
751,000
+577,200
| +332% | +$2.28M |
|
1655
CALL
Clorox
CLX
$11.6B
| $3.01M | ﹤0.01% |
29,900
-49,000
| -62% | -$5.32M |
|
1656
Danaher
DHR
$135B
| $3.01M | ﹤0.01% |
+13,157
| New | +$2.89M |
|
1657
CALL
Weyerhaeuser
WY
$17.3B
| $3.01M | ﹤0.01% |
127,100
+70,600
| +125% | +$1.63M |
|
1658
PUT
Shift4
FOUR
$3.84B
| $3M | ﹤0.01% |
47,700
+17,600
| +58% | +$1.24M |
|
1659
CALL
Hasbro
HAS
$12.6B
| $2.99M | ﹤0.01% |
36,500
-10,600
| -23% | -$831K |
|
1660
PUT
Citizens Financial Group
CFG
$30.4B
| $2.98M | ﹤0.01% |
51,100
-24,500
| -32% | -$1.32M |
|
1661
Copart
CPRT
$25.9B
| $2.98M | ﹤0.01% |
+76,034
| New | +$3.15M |
|
1662
PUT
Teck Resources
TECK
$29.5B
| $2.97M | ﹤0.01% |
62,100
-383,900
| -86% | -$16.6M |
|
1663
CALL
Viasat
VSAT
$9.79B
| $2.97M | ﹤0.01% |
86,300
-25,400
| -23% | -$897K |
|
|
FRMM
1664
CALL
Forum Markets
FRMM
$75.7M
| $2.97M | ﹤0.01% |
606,900
+527,330
| +663% | +$7.44M |
|
1665
PUT
Dutch Bros
BROS
$8.78B
| $2.97M | ﹤0.01% |
48,500
-116,100
| -71% | -$6.6M |
|
1666
Rithm Capital
RITM
$5.09B
| $2.96M | ﹤0.01% |
271,902
+105,050
| +63% | +$1.16M |
|
|
KOCG
1667
PUT
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $2.96M | ﹤0.01% |
56,800
-4,300
| -7% | -$224K |
|
1668
CALL
Rambus
RMBS
$10.4B
| $2.96M | ﹤0.01% |
32,200
-10,800
| -25% | -$1.06M |
|
1669
Symbotic
SYM
$5.11B
| $2.95M | ﹤0.01% |
+49,607
| New | +$3.28M |
|
1670
Lincoln National
LNC
$7.91B
| $2.95M | ﹤0.01% |
66,255
+17,469
| +36% | +$728K |
|
1671
Walt Disney
DIS
$165B
| $2.95M | ﹤0.01% |
+25,931
| New | +$2.86M |
|
|
STUB
1672
CALL
StubHub Holdings
STUB
$3.1B
| $2.94M | ﹤0.01% |
217,600
+128,600
| +144% | +$2.02M |
|
1673
CALL
Amneal Pharmaceuticals
AMRX
$5.72B
| $2.94M | ﹤0.01% |
233,300
-11,200
| -5% | -$128K |
|
1674
PUT
Aflac
AFL
$63.9B
| $2.93M | ﹤0.01% |
26,600
+12,800
| +93% | +$1.41M |
|
1675
CALL
TechnipFMC
FTI
$30.6B
| $2.93M | ﹤0.01% |
65,800
-1,600
| -2% | -$67.6K |
|
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.