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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4651
YieldMax Universe Fund of Option Income ETFs
YMAX
$384M
| $174K | ﹤0.01% |
+12,667
| New | +$168K |
|
4652
PUT
Algonquin Power & Utilities
AQN
$4.59B
| $173K | ﹤0.01% |
30,200
-17,000
| -36% | -$93.2K |
|
4653
Cellebrite
CLBT
$3.76B
| $173K | ﹤0.01% |
+10,864
| New | +$194K |
|
|
CPRX
4654
PUT
DELISTED
Catalyst Pharmaceutical
CPRX
| $173K | ﹤0.01% |
8,000
+6,400
| +400% | +$151K |
|
4655
WisdomTree Japan Hedged Equity Fund
DXJ
$7.07B
| $173K | ﹤0.01% |
+1,517
| New | +$166K |
|
4656
PUT
LCI Industries
LCII
$2.59B
| $173K | ﹤0.01% |
1,900
-16,200
| -90% | -$1.38M |
|
4657
PUT
MiMedx Group
MDXG
$630M
| $173K | ﹤0.01% |
28,400
+14,700
| +107% | +$97.8K |
|
4658
PUT
Nu Skin
NUS
$257M
| $173K | ﹤0.01% |
21,700
+20,800
| +2,311% | +$146K |
|
|
TRVG
4659
CALL
trivago
TRVG
$385M
| $173K | ﹤0.01% |
45,900
-900
| -2% | -$3.71K |
|
|
BZUN
4660
Baozun
BZUN
$179M
| $172K | ﹤0.01% |
69,113
+23,978
| +53% | +$66.3K |
|
4661
PUT
Compass Diversified
CODI
$752M
| $172K | ﹤0.01% |
27,400
+27,300
| +27,300% | +$304K |
|
4662
PUT
Globant
GLOB
$1.65B
| $172K | ﹤0.01% |
1,900
+900
| +90% | +$96.1K |
|
4663
Intapp
INTA
$2.44B
| $172K | ﹤0.01% |
3,334
+148
| +5% | +$8.09K |
|
|
LAND
4664
CALL
Gladstone Land Corp
LAND
$365M
| $172K | ﹤0.01% |
17,000
+5,000
| +42% | +$49.1K |
|
4665
Louisiana-Pacific
LPX
$5.14B
| $172K | ﹤0.01% |
2,001
-488
| -20% | -$43.4K |
|
4666
CALL
Sturm, Ruger & Co
RGR
$603M
| $172K | ﹤0.01% |
4,800
-13,200
| -73% | -$490K |
|
|
SPTN
4667
DELISTED
SpartanNash
SPTN
| $172K | ﹤0.01% |
6,524
+286
| +5% | +$5.72K |
|
4668
PUT
Zumiez
ZUMZ
$330M
| $172K | ﹤0.01% |
13,000
+6,600
| +103% | +$83.4K |
|
4669
PACS Group
PACS
$7.35B
| $172K | ﹤0.01% |
13,332
+13,178
| +8,557% | +$137K |
|
4670
CALL
Agilysys
AGYS
$3.21B
| $171K | ﹤0.01% |
1,500
+1,300
| +650% | +$117K |
|
|
CVSA
4671
Covista Inc
CVSA
$4.55B
| $171K | ﹤0.01% |
+1,347
| New | +$159K |
|
4672
CALL
Badger Meter
BMI
$3.87B
| $171K | ﹤0.01% |
700
+400
| +133% | +$90.6K |
|
4673
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.35B
| $171K | ﹤0.01% |
+1,012
| New | +$149K |
|
4674
Playtika
PLTK
$1.53B
| $171K | ﹤0.01% |
36,165
+4,222
| +13% | +$20.8K |
|
|
SFIX
4675
PUT
Stitch Fix
SFIX
$566M
| $171K | ﹤0.01% |
46,300
+42,800
| +1,223% | +$160K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.