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 | |
|---|---|---|---|---|---|---|
5901
PUT
Freshworks
FRSH
$3.14B
| $38K | ﹤0.01% |
3,100
-9,100
| -75% | -$108K |
|
5902
American Coastal Insurance
ACIC
$515M
| $38K | ﹤0.01% |
+3,006
| New | +$36.3K |
|
|
VTYX
5903
PUT
DELISTED
Ventyx Biosciences
VTYX
| $37.9K | ﹤0.01% |
4,200
+200
| +5% | +$1.5K |
|
5904
iShares Europe ETF
IEV
$1.67B
| $37.9K | ﹤0.01% |
552
-4,263
| -89% | -$285K |
|
|
BIOA
5905
BioAge Labs
BIOA
$402M
| $37.8K | ﹤0.01% |
2,860
+1,455
| +104% | +$12.9K |
|
5906
Dorchester Minerals
DMLP
$1.33B
| $37.7K | ﹤0.01% |
+1,686
| New | +$39.4K |
|
5907
PUT
Payoneer
PAYO
$2.42B
| $37.7K | ﹤0.01% |
6,700
+1,800
| +37% | +$10.4K |
|
5908
KraneShares Hang Seng TECH Index ETF
KTEC
$59.6M
| $37.6K | ﹤0.01% |
2,401
+1,108
| +86% | +$19.1K |
|
5909
CALL
Cambria Tail Risk ETF
TAIL
$147M
| $37.6K | ﹤0.01% |
1,900
-1,300
| -41% | -$15.4K |
|
5910
CALL
nLIGHT
LASR
$3.88B
| $37.5K | ﹤0.01% |
1,000
-27,100
| -96% | -$905K |
|
5911
PUT
Helios Technologies
HLIO
$2.57B
| $37.4K | ﹤0.01% |
700
| – | – |
|
5912
Fortive
FTV
$17.9B
| $37.4K | ﹤0.01% |
+677
| New | +$35.1K |
|
5913
CALL
NBT Bancorp
NBTB
$2.74B
| $37.4K | ﹤0.01% |
900
-400
| -31% | -$16.6K |
|
5914
CALL
Broadwind
BWEN
$93.6M
| $37.4K | ﹤0.01% |
13,200
+11,500
| +676% | +$30.2K |
|
5915
PUT
Usana Health Sciences
USNA
$408M
| $37.3K | ﹤0.01% |
1,900
-3,300
| -63% | -$68.5K |
|
5916
PUT
La-Z-Boy
LZB
$1.58B
| $37.3K | ﹤0.01% |
1,000
+700
| +233% | +$24.5K |
|
5917
Radware
RDWR
$1.1B
| $37.2K | ﹤0.01% |
1,544
-276
| -15% | -$6.74K |
|
5918
PUT
Brunswick
BC
$5.13B
| $37.1K | ﹤0.01% |
500
-6,300
| -93% | -$427K |
|
|
BTCL
5919
CALL
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$21.8M
| $37.1K | ﹤0.01% |
2,700
+1,600
| +145% | +$66.8K |
|
5920
Mama's Creations
MAMA
$857M
| $36.9K | ﹤0.01% |
+2,733
| New | +$31.4K |
|
5921
PUT
Standard Motor Products
SMP
$851M
| $36.9K | ﹤0.01% |
1,000
| – | – |
|
|
OGI
5922
CALL
Organigram Holdings
OGI
$132M
| $36.8K | ﹤0.01% |
21,900
-56,800
| -72% | -$97.6K |
|
5923
CALL
Stellus Capital Investment Corp
SCM
$217M
| $36.8K | ﹤0.01% |
2,900
+1,600
| +123% | +$19.6K |
|
|
BRAG
5924
CALL
Bragg Gaming Group
BRAG
$50.6M
| $36.8K | ﹤0.01% |
17,500
| – | – |
|
5925
NRC Health Common Stock
NRC
$432M
| $36.7K | ﹤0.01% |
+1,956
| New | +$29.5K |
|
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.