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 | |
|---|---|---|---|---|---|---|
3651
CALL
Hyatt Hotels
H
$17.8B
| $353K | ﹤0.01% |
2,200
-5,700
| -72% | -$873K |
|
3652
Goldman Sachs Physical Gold ETF Shares
AAAU
$2.44B
| $352K | ﹤0.01% |
+8,273
| New | +$339K |
|
3653
Royalty Pharma
RPRX
$26.6B
| $352K | ﹤0.01% |
+9,109
| New | +$347K |
|
3654
CALL
Telus
TU
$16.7B
| $352K | ﹤0.01% |
26,700
-111,100
| -81% | -$1.56M |
|
3655
PUT
ClearPoint Neuro
CLPT
$436M
| $352K | ﹤0.01% |
25,700
-5,900
| -19% | -$109K |
|
3656
Mattel
MAT
$4.49B
| $351K | ﹤0.01% |
17,697
-36,889
| -68% | -$713K |
|
3657
Alerian MLP ETF
AMLP
$12.9B
| $351K | ﹤0.01% |
7,461
-3,252
| -30% | -$152K |
|
3658
PUT
Worthington Enterprises
WOR
$2.82B
| $351K | ﹤0.01% |
6,800
-300
| -4% | -$16.6K |
|
|
GTLS
3659
PUT
DELISTED
Chart Industries
GTLS
| $351K | ﹤0.01% |
1,700
+900
| +113% | +$182K |
|
3660
CALL
IES Holdings
IESC
$10.8B
| $350K | ﹤0.01% |
900
-200
| -18% | -$80.4K |
|
3661
CALL
Euronet Worldwide
EEFT
$3.15B
| $350K | ﹤0.01% |
4,600
+4,000
| +667% | +$312K |
|
3662
Odyssey Marine Exploration
OMEX
$39.4M
| $350K | ﹤0.01% |
178,554
+176,529
| +8,717% | +$408K |
|
3663
US Bancorp
USB
$100B
| $350K | ﹤0.01% |
+6,556
| New | +$322K |
|
3664
Bumble
BMBL
$393M
| $350K | ﹤0.01% |
97,905
+36,081
| +58% | +$160K |
|
3665
Genworth Financial
GNW
$3.85B
| $349K | ﹤0.01% |
38,694
+21,493
| +125% | +$187K |
|
3666
TriMas Corp
TRS
$1.44B
| $349K | ﹤0.01% |
+9,846
| New | +$344K |
|
|
SNBR
3667
DELISTED
Sleep Number
SNBR
| $349K | ﹤0.01% |
+41,233
| New | +$261K |
|
3668
CALL
Qfin Holdings
QFIN
$1.66B
| $349K | ﹤0.01% |
18,100
-46,200
| -72% | -$1.04M |
|
3669
CALL
Unum
UNM
$14B
| $349K | ﹤0.01% |
4,500
-3,600
| -44% | -$275K |
|
3670
CALL
QuidelOrtho
QDEL
$1.14B
| $348K | ﹤0.01% |
12,200
+10,900
| +838% | +$295K |
|
3671
CALL
Allegro MicroSystems
ALGM
$8.29B
| $348K | ﹤0.01% |
13,200
-3,400
| -20% | -$93.6K |
|
|
GOOS
3672
Canada Goose Holdings
GOOS
$903M
| $348K | ﹤0.01% |
26,864
-14,104
| -34% | -$188K |
|
3673
CALL
MasTec
MTZ
$24.7B
| $348K | ﹤0.01% |
1,600
-7,400
| -82% | -$1.55M |
|
3674
Global X Defense Tech ETF
SHLD
$7.13B
| $348K | ﹤0.01% |
5,364
-59,805
| -92% | -$3.94M |
|
3675
CALL
Apogee Therapeutics
APGE
$10.1B
| $347K | ﹤0.01% |
4,600
-7,100
| -61% | -$447K |
|
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.