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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5476
CALL
Anixa Biosciences
ANIX
$104M
| $105K | ﹤0.01% |
37,600
+16,700
| +80% | +$46.4K |
|
|
LIF
5477
PUT
Life360
LIF
$3.6B
| $105K | ﹤0.01% |
1,900
+1,000
| +111% | +$44.5K |
|
5478
PUT
Achieve Life Sciences
ACHV
$874M
| $105K | ﹤0.01% |
16,100
+9,200
| +133% | +$43.9K |
|
|
IRD
5479
Opus Genetics
IRD
$389M
| $105K | ﹤0.01% |
25,553
-56,927
| -69% | -$266K |
|
5480
PUT
Vishay Precision Group
VPG
$839M
| $105K | ﹤0.01% |
+700
| New | +$65K |
|
5481
PUT
Edgewell Personal Care
EPC
$1.33B
| $105K | ﹤0.01% |
3,900
-1,200
| -24% | -$25.6K |
|
5482
PUT
Treace Medical Concepts
TMCI
$313M
| $105K | ﹤0.01% |
+26,300
| New | +$72.3K |
|
5483
Knight Transportation
KNX
$11.7B
| $104K | ﹤0.01% |
1,341
-19,763
| -94% | -$1.37M |
|
|
LX
5484
LexinFintech Holdings
LX
$145M
| $104K | ﹤0.01% |
52,983
-38,510
| -42% | -$82K |
|
5485
XPEL
XPEL
$1.42B
| $104K | ﹤0.01% |
+2,102
| New | +$95.7K |
|
5486
CALL
Similarweb
SMWB
$780M
| $104K | ﹤0.01% |
17,000
+16,900
| +16,900% | +$61.5K |
|
5487
CALL
Sprout Social
SPT
$688M
| $104K | ﹤0.01% |
13,800
+6,600
| +92% | +$42.9K |
|
5488
PUT
Arbutus Biopharma
ABUS
$1.02B
| $104K | ﹤0.01% |
21,700
-25,900
| -54% | -$114K |
|
5489
CALL
Solid Power
SLDP
$575M
| $104K | ﹤0.01% |
40,200
-134,400
| -77% | -$415K |
|
5490
PUT
Universal Health Services
UHS
$10B
| $104K | ﹤0.01% |
700
-1,900
| -73% | -$309K |
|
5491
CALL
Fulton Financial
FULT
$4.6B
| $104K | ﹤0.01% |
+4,300
| New | +$94.3K |
|
|
SPCF
5492
ProShares Ultra SpaceX
SPCF
$79.4M
| $104K | ﹤0.01% |
+4,054
| New | +$108K |
|
5493
ACV Auctions
ACVA
$1.19B
| $104K | ﹤0.01% |
14,450
+11,645
| +415% | +$66K |
|
5494
CALL
Badger Meter
BMI
$3.84B
| $104K | ﹤0.01% |
+700
| New | +$91.6K |
|
|
RSVR
5495
CALL
Reservoir Media
RSVR
$642M
| $104K | ﹤0.01% |
10,500
-83,800
| -89% | -$847K |
|
5496
Mission Produce
AVO
$1.12B
| $104K | ﹤0.01% |
8,805
-10,775
| -55% | -$136K |
|
5497
Enova International
ENVA
$5.74B
| $104K | ﹤0.01% |
431
-1,587
| -79% | -$273K |
|
|
BWIN
5498
CALL
Baldwin Insurance Group
BWIN
$2.99B
| $104K | ﹤0.01% |
3,900
+3,600
| +1,200% | +$77.8K |
|
|
WCC
5499
PUT
WESCO International
WCC
$17.1B
| $104K | ﹤0.01% |
300
+200
| +200% | +$67.9K |
|
|
QCML
5500
GraniteShares 2x Long QCOM Daily ETF
QCML
$52.5M
| $104K | ﹤0.01% |
+5,218
| New | +$121K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.