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 | |
|---|---|---|---|---|---|---|
4476
PUT
Energizer
ENR
$1.47B
| $157K | ﹤0.01% |
7,900
-8,800
| -53% | -$192K |
|
|
HOOY
4477
YieldMax HOOD Option Income Strategy ETF
HOOY
$125M
| $157K | ﹤0.01% |
3,310
+2,885
| +679% | +$175K |
|
|
NAGE
4478
Niagen Bioscience
NAGE
$256M
| $157K | ﹤0.01% |
24,662
+264
| +1% | +$1.84K |
|
4479
PUT
Weatherford International
WFRD
$5.9B
| $157K | ﹤0.01% |
2,000
-14,500
| -88% | -$1.05M |
|
|
HOLX
4480
CALL
DELISTED
Hologic
HOLX
| $156K | ﹤0.01% |
2,100
-34,900
| -94% | -$2.55M |
|
4481
Nexa Resources
NEXA
$1.61B
| $156K | ﹤0.01% |
17,673
+15,167
| +605% | +$98.7K |
|
4482
LCI Industries
LCII
$2.59B
| $156K | ﹤0.01% |
+1,288
| New | +$137K |
|
4483
IonQ
IONQ
$11.9B
| $156K | ﹤0.01% |
+3,481
| New | +$195K |
|
4484
Veritone
VERI
$92.9M
| $156K | ﹤0.01% |
33,564
-50,883
| -60% | -$274K |
|
4485
iQIYI
IQ
$1.19B
| $156K | ﹤0.01% |
81,275
-55,707
| -41% | -$119K |
|
4486
ProShares Ether Strategy ETF
EETH
$54.7M
| $156K | ﹤0.01% |
4,194
-6,845
| -62% | -$342K |
|
4487
CALL
Outdoor Holding Co
POWW
$249M
| $156K | ﹤0.01% |
91,200
+89,800
| +6,414% | +$154K |
|
|
RPT
4488
CALL
Rithm Property Trust
RPT
$94.4M
| $156K | ﹤0.01% |
9,400
+1,967
| +26% | +$30.2K |
|
4489
StoneX
SNEX
$8.72B
| $156K | ﹤0.01% |
3,683
+3,003
| +442% | +$126K |
|
4490
PUT
OR Royalties Inc
OR
$5.53B
| $156K | ﹤0.01% |
4,400
-6,100
| -58% | -$214K |
|
4491
PUT
Target Hospitality
TH
$1.43B
| $155K | ﹤0.01% |
19,400
-30,800
| -61% | -$234K |
|
4492
CALL
Lazard
LAZ
$3.96B
| $155K | ﹤0.01% |
3,200
+500
| +19% | +$24.9K |
|
|
BTOP
4493
PUT
DELISTED
Bitwise Bitcoin and Ether Equal Weight Strategy ETF
BTOP
| $155K | ﹤0.01% |
+5,400
| New | +$172K |
|
|
JOYY
4494
JOYY Inc
JOYY
$3.73B
| $155K | ﹤0.01% |
2,397
-1,198
| -33% | -$73.2K |
|
4495
ProShares Short High Yield
SJB
$51.9M
| $155K | ﹤0.01% |
10,162
+9,589
| +1,673% | +$148K |
|
4496
First Majestic Silver
AG
$7.52B
| $155K | ﹤0.01% |
9,307
-423,731
| -98% | -$5.89M |
|
4497
CALL
Jasper Therapeutics
JSPR
$20M
| $155K | ﹤0.01% |
84,700
+29,800
| +54% | +$59.8K |
|
4498
Kimco Realty
KIM
$17.5B
| $155K | ﹤0.01% |
7,638
-5,215
| -41% | -$108K |
|
4499
iShares Dow Jones US ETF
IYY
$2.89B
| $155K | ﹤0.01% |
+933
| New | +$154K |
|
4500
PUT
Saratoga Investment
SAR
$309M
| $155K | ﹤0.01% |
6,700
+400
| +6% | +$9.07K |
|
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.