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 | |
|---|---|---|---|---|---|---|
5451
CALL
Xenon Pharmaceuticals
XENE
$6.06B
| $62.7K | ﹤0.01% |
1,400
-14,800
| -91% | -$622K |
|
5452
Mizuho Financial
MFG
$127B
| $62.6K | ﹤0.01% |
8,551
+6,430
| +303% | +$43.9K |
|
5453
CALL
Element Solutions
ESI
$8.95B
| $62.5K | ﹤0.01% |
2,500
+2,200
| +733% | +$57.1K |
|
5454
PUT
ManpowerGroup
MAN
$2.44B
| $62.4K | ﹤0.01% |
2,100
| – | – |
|
5455
CALL
VistaGen Therapeutics
VTGN
$9.89M
| $62.4K | ﹤0.01% |
94,300
+58,400
| +163% | +$211K |
|
5456
Virtus Terranova US Quality Momentum ETF
JOET
$241M
| $62.4K | ﹤0.01% |
1,485
+1,347
| +976% | +$57.1K |
|
5457
PUT
Financial Institutions
FISI
$816M
| $62.3K | ﹤0.01% |
+2,000
| New | +$58.9K |
|
5458
CALL
NerdWallet
NRDS
$592M
| $62.3K | ﹤0.01% |
4,600
-7,000
| -60% | -$91.6K |
|
5459
CALL
United States Brent Oil Fund
BNO
$781M
| $62.3K | ﹤0.01% |
2,200
-15,200
| -87% | -$439K |
|
5460
CALL
Franklin Covey
FC
$242M
| $62.1K | ﹤0.01% |
3,700
-1,700
| -31% | -$28.5K |
|
5461
CALL
Cognyte Software
CGNT
$659M
| $62K | ﹤0.01% |
6,600
-45,400
| -87% | -$393K |
|
5462
WisdomTree Japan Hedged Equity Fund
DXJ
$7.08B
| $62K | ﹤0.01% |
+430
| New | +$59K |
|
|
ZEPP
5463
CALL
Zepp Health
ZEPP
$66.4M
| $62K | ﹤0.01% |
2,300
-900
| -28% | -$32.1K |
|
5464
CALL
Sun Communities
SUI
$15.2B
| $62K | ﹤0.01% |
500
+300
| +150% | +$37.5K |
|
5465
CALL
AutoNation
AN
$7.11B
| $61.9K | ﹤0.01% |
300
-700
| -70% | -$146K |
|
|
LTC
5466
PUT
LTC Properties
LTC
$2.06B
| $61.9K | ﹤0.01% |
1,800
+800
| +80% | +$28.2K |
|
5467
PUT
Packaging Corp of America
PKG
$21.9B
| $61.9K | ﹤0.01% |
300
+200
| +200% | +$40.7K |
|
5468
Corporacion America
CAAP
$4.21B
| $61.9K | ﹤0.01% |
2,379
+1,013
| +74% | +$22.7K |
|
|
TBCH
5469
Turtle Beach Corp
TBCH
$243M
| $61.8K | ﹤0.01% |
4,405
-17,364
| -80% | -$258K |
|
|
MAPS
5470
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $61.7K | ﹤0.01% |
74,800
-54,300
| -42% | -$53.4K |
|
5471
Gaming and Leisure Properties
GLPI
$12.7B
| $61.6K | ﹤0.01% |
1,379
+844
| +158% | +$37.4K |
|
5472
CALL
Itaú Unibanco
ITUB
$93.2B
| $61.6K | ﹤0.01% |
8,600
-174,740
| -95% | -$1.24M |
|
|
NXDR
5473
PUT
Nextdoor Holdings
NXDR
$847M
| $61.5K | ﹤0.01% |
29,300
+27,000
| +1,174% | +$52.9K |
|
5474
CALL
Genasys
GNSS
$76.1M
| $61.3K | ﹤0.01% |
+28,600
| New | +$64.1K |
|
5475
Bloomin' Brands
BLMN
$741M
| $61.3K | ﹤0.01% |
9,937
+4,357
| +78% | +$30.4K |
|
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.