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 | |
|---|---|---|---|---|---|---|
6751
PUT
LifeMD
LFMD
$169M
| $14.3K | ﹤0.01% |
4,200
-14,700
| -78% | -$71.4K |
|
6752
CALL
Adicet Bio
ACET
$85.2M
| $14.3K | ﹤0.01% |
+1,700
| New | +$18.8K |
|
6753
PUT
Equitable Holdings
EQH
$13B
| $14.3K | ﹤0.01% |
300
-700
| -70% | -$33.2K |
|
6754
PUT
BGC Group
BGC
$5.52B
| $14.3K | ﹤0.01% |
1,600
-5,700
| -78% | -$51.3K |
|
6755
PUT
First Busey Corp
BUSE
$2.57B
| $14.3K | ﹤0.01% |
+600
| New | +$14.1K |
|
6756
CPI Aerostructures
CVU
$66.2M
| $14.3K | ﹤0.01% |
+3,604
| New | +$9.86K |
|
6757
CALL
AmpliTech
AMPG
$118M
| $14.3K | ﹤0.01% |
+11,000
| New | +$37.2K |
|
6758
PUT
Alto Neuroscience
ANRO
$1.05B
| $14.2K | ﹤0.01% |
800
+200
| +33% | +$2.52K |
|
6759
Precision BioSciences
DTIL
$180M
| $14.2K | ﹤0.01% |
+3,413
| New | +$19.4K |
|
6760
PUT
Coty
COTY
$2.42B
| $14.2K | ﹤0.01% |
4,600
-281,100
| -98% | -$1.02M |
|
6761
iShares Core MSCI Total International Stock ETF
IXUS
$58.3B
| $14.1K | ﹤0.01% |
+167
| New | +$14K |
|
|
YRD
6762
Yiren Digital
YRD
$97.1M
| $14.1K | ﹤0.01% |
3,816
-11,667
| -75% | -$59.6K |
|
6763
PUT
Solid Biosciences
SLDB
$794M
| $14.1K | ﹤0.01% |
2,500
-1,700
| -40% | -$9.21K |
|
6764
CALL
SkinHealth Systems
SKIN
$88.8M
| $14K | ﹤0.01% |
10,100
-16,800
| -62% | -$24.3K |
|
6765
CALL
Regal Rexnord
RRX
$13.7B
| $14K | ﹤0.01% |
100
-8,800
| -99% | -$1.25M |
|
6766
CALL
Interface
TILE
$1.99B
| $14K | ﹤0.01% |
500
| – | – |
|
6767
CALL
Bitwise Crypto Industry Innovators ETF
BITQ
$379M
| $14K | ﹤0.01% |
+700
| New | +$17.2K |
|
6768
Coca-Cola Consolidated
COKE
$12.5B
| $13.9K | ﹤0.01% |
91
-1,125
| -93% | -$165K |
|
|
XXRP
6769
Teucrium 2x Long Daily XRP ETF
XXRP
$87.7M
| $13.9K | ﹤0.01% |
146
-607
| -81% | -$113K |
|
6770
CALL
Acumen Pharmaceuticals
ABOS
$155M
| $13.9K | ﹤0.01% |
6,600
-6,200
| -48% | -$12.3K |
|
6771
PUT
Sprott Junior Gold Miners ETF
SGDJ
$267M
| $13.9K | ﹤0.01% |
200
-400
| -67% | -$31.4K |
|
6772
PUT
New York Times
NYT
$12.1B
| $13.9K | ﹤0.01% |
200
-17,700
| -99% | -$1.1M |
|
|
ADAM
6773
PUT
Adamas Trust
ADAM
$815M
| $13.9K | ﹤0.01% |
+1,900
| New | +$13.5K |
|
6774
CALL
Intrepid Potash
IPI
$456M
| $13.9K | ﹤0.01% |
500
+400
| +400% | +$10.8K |
|
|
RWT
6775
CALL
Redwood Trust
RWT
$574M
| $13.8K | ﹤0.01% |
2,500
-48,600
| -95% | -$267K |
|
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.