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 | |
|---|---|---|---|---|---|---|
6376
Peoples Bancorp
PEBO
$1.5B
| $22.2K | ﹤0.01% |
740
-1,783
| -71% | -$53K |
|
|
NAVN
6377
PUT
Navan Inc
NAVN
$6.77B
| $22.2K | ﹤0.01% |
+1,300
| New | +$20.7K |
|
6378
PUT
LifeVantage
LFVN
$81.1M
| $22.2K | ﹤0.01% |
3,600
+1,200
| +50% | +$8.89K |
|
6379
PUT
MediWound
MDWD
$181M
| $22.2K | ﹤0.01% |
1,200
-58,900
| -98% | -$1.08M |
|
6380
Twist Bioscience
TWST
$5.7B
| $22.1K | ﹤0.01% |
+698
| New | +$21.8K |
|
6381
Champion Homes
SKY
$4.37B
| $22.1K | ﹤0.01% |
262
-3,683
| -93% | -$290K |
|
6382
CALL
WSFS Financial
WSFS
$4.12B
| $22.1K | ﹤0.01% |
400
-200
| -33% | -$10.9K |
|
6383
CALL
Griffon
GFF
$3.95B
| $22.1K | ﹤0.01% |
300
-2,000
| -87% | -$149K |
|
6384
PUT
AMN Healthcare
AMN
$1.3B
| $22.1K | ﹤0.01% |
1,400
-6,500
| -82% | -$116K |
|
6385
Telesat
TSAT
$567M
| $22.1K | ﹤0.01% |
758
-16,018
| -95% | -$466K |
|
6386
CALL
Ingredion
INGR
$6.27B
| $22.1K | ﹤0.01% |
200
| – | – |
|
6387
Korn Ferry
KFY
$4.18B
| $22.1K | ﹤0.01% |
334
-3,686
| -92% | -$248K |
|
6388
PUT
Mission Produce
AVO
$1.11B
| $22K | ﹤0.01% |
1,900
+1,300
| +217% | +$15.6K |
|
6389
PUT
Scholar Rock
SRRK
$5.67B
| $22K | ﹤0.01% |
500
-164,300
| -100% | -$6.16M |
|
6390
Klaviyo
KVYO
$5.34B
| $22K | ﹤0.01% |
678
-10,469
| -94% | -$293K |
|
6391
VanEck Digital Transformation ETF
DAPP
$234M
| $22K | ﹤0.01% |
1,331
-346
| -21% | -$7.2K |
|
6392
PUT
DXP Enterprises
DXPE
$2.43B
| $22K | ﹤0.01% |
+200
| New | +$21.8K |
|
6393
CoinShares ETF Trust CoinShares Bitcoin and Ether ETF
BTF
$13.6M
| $21.9K | ﹤0.01% |
+839
| New | +$56.9K |
|
6394
CALL
Televisa
TV
$1.48B
| $21.8K | ﹤0.01% |
+7,500
| New | +$20.5K |
|
6395
CALL
FTC Solar
FTCI
$44M
| $21.8K | ﹤0.01% |
+2,000
| New | +$18.2K |
|
6396
CALL
Green Dot
GDOT
$743M
| $21.8K | ﹤0.01% |
1,700
-99,200
| -98% | -$1.23M |
|
6397
CALL
Morningstar
MORN
$7.22B
| $21.7K | ﹤0.01% |
+100
| New | +$21.7K |
|
6398
PUT
ICL Group
ICL
$6.53B
| $21.7K | ﹤0.01% |
+3,800
| New | +$22K |
|
6399
Westrock Coffee
WEST
$792M
| $21.7K | ﹤0.01% |
5,330
+4,559
| +591% | +$20K |
|
6400
PUT
inTEST
INTT
$155M
| $21.7K | ﹤0.01% |
2,900
+2,400
| +480% | +$19K |
|
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.