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 | |
|---|---|---|---|---|---|---|
1876
PUT
Norfolk Southern
NSC
$78.8B
| $2.28M | ﹤0.01% |
7,900
-100
| -1% | -$28.9K |
|
|
AIV
1877
PUT
Aimco
AIV
$380M
| $2.28M | ﹤0.01% |
383,600
+343,300
| +852% | +$2.06M |
|
|
SLNO
1878
DELISTED
Soleno Therapeutics
SLNO
| $2.27M | ﹤0.01% |
49,108
+23,999
| +96% | +$1.32M |
|
1879
PUT
Ovintiv
OVV
$17.5B
| $2.27M | ﹤0.01% |
58,000
-45,100
| -44% | -$1.75M |
|
1880
CALL
Campbell Soup
CPB
$6.51B
| $2.26M | ﹤0.01% |
81,200
-65,900
| -45% | -$1.98M |
|
1881
CALL
Freshworks
FRSH
$2.84B
| $2.26M | ﹤0.01% |
184,400
+103,600
| +128% | +$1.22M |
|
1882
PUT
Floor & Decor
FND
$5.81B
| $2.25M | ﹤0.01% |
37,000
-18,600
| -33% | -$1.21M |
|
1883
CALL
Becton Dickinson
BDX
$43.1B
| $2.25M | ﹤0.01% |
11,600
+2,100
| +22% | +$400K |
|
|
VZLA
1884
CALL
Vizsla Silver
VZLA
$1.16B
| $2.25M | ﹤0.01% |
411,100
+408,600
| +16,344% | +$1.92M |
|
|
MRSH
1885
CALL
Marsh
MRSH
$86.3B
| $2.24M | ﹤0.01% |
12,100
-5,300
| -30% | -$991K |
|
1886
CALL
JFrog
FROG
$9.71B
| $2.24M | ﹤0.01% |
35,900
+2,600
| +8% | +$148K |
|
|
CGC
1887
CALL
Canopy Growth
CGC
$375M
| $2.24M | ﹤0.01% |
2,020,000
+318,800
| +19% | +$410K |
|
1888
Kinross Gold
KGC
$28.5B
| $2.23M | ﹤0.01% |
+79,202
| New | +$2.06M |
|
1889
CALL
CG Oncology
CGON
$6.11B
| $2.23M | ﹤0.01% |
53,700
+46,000
| +597% | +$1.9M |
|
1890
Uber
UBER
$134B
| $2.23M | ﹤0.01% |
+27,250
| New | +$2.45M |
|
1891
CALL
Transmedics
TMDX
$2.5B
| $2.23M | ﹤0.01% |
18,300
-16,200
| -47% | -$2.03M |
|
1892
CALL
Citizens Financial Group
CFG
$30.4B
| $2.23M | ﹤0.01% |
38,100
-44,800
| -54% | -$2.41M |
|
1893
PUT
Biohaven
BHVN
$2.16B
| $2.23M | ﹤0.01% |
197,100
+88,200
| +81% | +$1.09M |
|
1894
CALL
Range Resources
RRC
$9.11B
| $2.22M | ﹤0.01% |
63,100
-56,300
| -47% | -$2.1M |
|
1895
CALL
Omeros
OMER
$709M
| $2.22M | ﹤0.01% |
129,500
+39,000
| +43% | +$336K |
|
1896
PUT
Richtech Robotics
RR
$347M
| $2.22M | ﹤0.01% |
688,100
+165,800
| +32% | +$733K |
|
1897
PayPal
PYPL
$49.5B
| $2.22M | ﹤0.01% |
38,048
-15,545
| -29% | -$1.01M |
|
1898
CALL
FS KKR Capital
FSK
$2.98B
| $2.22M | ﹤0.01% |
149,800
+114,400
| +323% | +$1.73M |
|
1899
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $2.21M | ﹤0.01% |
25,000
+2,400
| +11% | +$141K |
|
1900
CALL
Warner Music
WMG
$13.8B
| $2.21M | ﹤0.01% |
72,100
| – | – |
|
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.