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 | |
|---|---|---|---|---|---|---|
5576
IHS Holding
IHS
$2.76B
| $55.1K | ﹤0.01% |
7,387
+5,968
| +421% | +$41.1K |
|
5577
CALL
Equillium
EQ
$139M
| $55K | ﹤0.01% |
35,500
-14,400
| -29% | -$17.5K |
|
5578
PUT
ABM Industries
ABM
$2.81B
| $55K | ﹤0.01% |
1,300
+1,000
| +333% | +$43.9K |
|
5579
PUT
NovaGold Resources
NG
$2.56B
| $55K | ﹤0.01% |
5,900
-11,000
| -65% | -$102K |
|
|
SEM
5580
PUT
DELISTED
Select Medical
SEM
| $54.9K | ﹤0.01% |
3,700
+2,700
| +270% | +$38.2K |
|
5581
CALL
Sabra Healthcare REIT
SBRA
$5.34B
| $54.9K | ﹤0.01% |
2,900
-5,700
| -66% | -$106K |
|
5582
PUT
Compañía de Cervecerías Unidas
CCU
$2.12B
| $54.9K | ﹤0.01% |
4,300
+400
| +10% | +$5.06K |
|
5583
The 3D Printing ETF
PRNT
$59.5M
| $54.8K | ﹤0.01% |
+2,455
| New | +$56.1K |
|
5584
ProShares UltraPro Russell2000
URTY
$322M
| $54.8K | ﹤0.01% |
1,031
+765
| +288% | +$41.4K |
|
5585
YieldMax META Option Income Strategy ETF
FBY
$101M
| $54.6K | ﹤0.01% |
4,328
+4,169
| +2,622% | +$56.8K |
|
5586
CALL
Trustmark
TRMK
$2.76B
| $54.5K | ﹤0.01% |
1,400
-100
| -7% | -$3.89K |
|
5587
PUT
Veritone
VERI
$101M
| $54.4K | ﹤0.01% |
11,700
-39,600
| -77% | -$213K |
|
5588
Ocean Power Technologies
OPTT
$48.9M
| $54.3K | ﹤0.01% |
181,016
+6,100
| +3% | +$2.74K |
|
5589
CALL
Nerdy
NRDY
$106M
| $54.3K | ﹤0.01% |
+52,200
| New | +$58.8K |
|
5590
Douglas Elliman
DOUG
$154M
| $54.1K | ﹤0.01% |
22,846
-16,170
| -41% | -$41.6K |
|
5591
PUT
Leidos
LDOS
$14.5B
| $54.1K | ﹤0.01% |
300
-6,300
| -95% | -$1.19M |
|
5592
Radian Group
RDN
$5.18B
| $54.1K | ﹤0.01% |
+1,502
| New | +$52.4K |
|
5593
Ryman Hospitality Properties
RHP
$8.43B
| $53.8K | ﹤0.01% |
569
+528
| +1,288% | +$48.8K |
|
5594
United States 12 Month Natural Gas Fund
UNL
$13.5M
| $53.6K | ﹤0.01% |
+7,266
| New | +$57.9K |
|
|
OTLY
5595
Oatly Group
OTLY
$465M
| $53.5K | ﹤0.01% |
5,007
-628
| -11% | -$8.32K |
|
5596
CALL
Rhythm Pharmaceuticals
RYTM
$6.81B
| $53.5K | ﹤0.01% |
500
+200
| +67% | +$21.2K |
|
5597
Cadre Holdings
CDRE
$1.32B
| $53.4K | ﹤0.01% |
1,307
+884
| +209% | +$36.8K |
|
|
CRCG
5598
PUT
Leverage Shares 2X Long CRCL Daily ETF
CRCG
$82M
| $53.3K | ﹤0.01% |
1,890
+480
| +34% | +$26.2K |
|
5599
PUT
Pembina Pipeline
PBA
$28.4B
| $53.3K | ﹤0.01% |
+1,400
| New | +$53.8K |
|
5600
PUT
Arcosa
ACA
$7.13B
| $53.2K | ﹤0.01% |
500
-600
| -55% | -$60.6K |
|
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.