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 | |
|---|---|---|---|---|---|---|
1276
CALL
Gossamer Bio
GOSS
$66.2M
| $4.93M | ﹤0.01% |
1,590,600
+288,200
| +22% | +$822K |
|
1277
iShares MSCI Brazil ETF
EWZ
$9.07B
| $4.91M | ﹤0.01% |
+154,529
| New | +$4.89M |
|
1278
PUT
YPF
YPF
$20.2B
| $4.91M | ﹤0.01% |
135,700
-48,800
| -26% | -$1.62M |
|
1279
PUT
SolarEdge
SEDG
$2.56B
| $4.9M | ﹤0.01% |
169,900
-92,700
| -35% | -$3.23M |
|
1280
CALL
United States Natural Gas Fund
UNG
$470M
| $4.9M | ﹤0.01% |
401,500
+30,800
| +8% | +$415K |
|
1281
Cardinal Health
CAH
$53.4B
| $4.9M | ﹤0.01% |
+23,840
| New | +$4.49M |
|
1282
CALL
Whirlpool
WHR
$2.42B
| $4.9M | ﹤0.01% |
67,900
-6,200
| -8% | -$458K |
|
1283
PUT
CAVA Group
CAVA
$7.19B
| $4.89M | ﹤0.01% |
83,300
-80,300
| -49% | -$4.48M |
|
1284
CALL
VICI Properties
VICI
$29.4B
| $4.89M | ﹤0.01% |
173,800
+23,800
| +16% | +$707K |
|
1285
CALL
BlackBerry
BB
$5.01B
| $4.88M | ﹤0.01% |
1,287,600
+113,200
| +10% | +$498K |
|
1286
PUT
Owens Corning
OC
$11.4B
| $4.87M | ﹤0.01% |
43,500
+38,700
| +806% | +$4.54M |
|
1287
Chewy
CHWY
$8.61B
| $4.87M | ﹤0.01% |
147,293
+30,757
| +26% | +$1.07M |
|
1288
CALL
Sigma Lithium
SGML
$1.08B
| $4.86M | ﹤0.01% |
368,800
+170,900
| +86% | +$1.47M |
|
1289
CALL
International Paper
IP
$21.8B
| $4.86M | ﹤0.01% |
123,400
+70,400
| +133% | +$2.89M |
|
1290
PUT
e.l.f. Beauty
ELF
$4.47B
| $4.86M | ﹤0.01% |
63,900
-102,400
| -62% | -$10.1M |
|
1291
CALL
Suncor Energy
SU
$77.9B
| $4.85M | ﹤0.01% |
109,300
-230,000
| -68% | -$9.72M |
|
1292
PUT
FTAI Aviation
FTAI
$22.1B
| $4.84M | ﹤0.01% |
24,600
-22,600
| -48% | -$3.85M |
|
1293
CALL
Deutsche Bank
DB
$66.3B
| $4.82M | ﹤0.01% |
125,100
-106,300
| -46% | -$3.84M |
|
1294
PUT
Hershey
HSY
$35.4B
| $4.82M | ﹤0.01% |
26,500
-35,700
| -57% | -$6.53M |
|
1295
CALL
SS&C Technologies
SSNC
$17.8B
| $4.82M | ﹤0.01% |
55,100
+54,100
| +5,410% | +$4.61M |
|
1296
CALL
Imperial Oil
IMO
$62.3B
| $4.81M | ﹤0.01% |
55,700
-8,600
| -13% | -$783K |
|
1297
PUT
Tidewater
TDW
$3.89B
| $4.8M | ﹤0.01% |
95,100
-7,400
| -7% | -$391K |
|
1298
CALL
Beyond Meat
BYND
$290M
| $4.78M | ﹤0.01% |
5,835,300
+5,145,300
| +746% | +$7.16M |
|
1299
PUT
Intuitive Machines
LUNR
$2.09B
| $4.78M | ﹤0.01% |
294,800
-143,400
| -33% | -$1.66M |
|
|
VISN
1300
CALL
Vistance Networks Inc
VISN
$2.66B
| $4.78M | ﹤0.01% |
263,900
-437,100
| -62% | -$7.54M |
|
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.