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 | |
|---|---|---|---|---|---|---|
|
IWMI
5626
NEOS Russell 2000 High Income ETF
IWMI
$1.24B
| $93.4K | ﹤0.01% |
+1,745
| New | +$89.6K |
|
5627
PUT
Upbound Group
UPBD
$1.11B
| $93.4K | ﹤0.01% |
4,400
-27,500
| -86% | -$514K |
|
5628
Nabors Industries
NBR
$1.38B
| $93.3K | ﹤0.01% |
1,111
-725
| -39% | -$67.5K |
|
5629
CALL
Gray Television
GTN
$510M
| $93.3K | ﹤0.01% |
23,500
+3,500
| +18% | +$16.1K |
|
|
COII
5630
CALL
DELISTED
REX COIN Covered Call ETF
COII
| $93.2K | ﹤0.01% |
4,800
+3,700
| +336% | +$34.7K |
|
5631
CALL
Chemed
CHE
$6.79B
| $93.1K | ﹤0.01% |
200
-100
| -33% | -$42K |
|
5632
CALL
U-Haul Holding Co Series N
UHAL.B
$11.5B
| $93.1K | ﹤0.01% |
1,600
+1,100
| +220% | +$54.8K |
|
5633
CALL
Jones Lang LaSalle
JLL
$16.7B
| $93K | ﹤0.01% |
300
-1,700
| -85% | -$528K |
|
|
GLIBK
5634
Liberty Capital Corp Series C GCI Group Common Stock
GLIBK
$1.05B
| $92.8K | ﹤0.01% |
+4,304
| New | +$121K |
|
5635
Solid Biosciences
SLDB
$1.1B
| $92.8K | ﹤0.01% |
9,285
-5,812
| -38% | -$44.1K |
|
5636
iShares Russell Top 200 Growth ETF
IWY
$15.9B
| $92.7K | ﹤0.01% |
319
+73
| +30% | +$20.6K |
|
|
XXRP
5637
PUT
Teucrium 2x Long Daily XRP ETF
XXRP
$148M
| $92.6K | ﹤0.01% |
+4,500
| New | +$158K |
|
|
EFC
5638
PUT
Ellington Financial
EFC
$1.74B
| $92.5K | ﹤0.01% |
6,800
+5,800
| +580% | +$76.8K |
|
|
VMRK
5639
Vivmark Residential
VMRK
$50.6B
| $92.5K | ﹤0.01% |
1,362
-3,678
| -73% | -$238K |
|
5640
PUT
Dana Inc
DAN
$3.45B
| $92.5K | ﹤0.01% |
3,400
| – | – |
|
|
VOYG
5641
Voyager Technologies
VOYG
$2.07B
| $92.5K | ﹤0.01% |
+2,867
| New | +$99.2K |
|
5642
News Corp Class A
NWSA
$16.3B
| $92.4K | ﹤0.01% |
3,722
-2,850
| -43% | -$73.8K |
|
5643
Safe Bulkers
SB
$934M
| $92.4K | ﹤0.01% |
14,643
+14,546
| +14,996% | +$97.2K |
|
5644
CALL
Axogen
AXGN
$2.6B
| $92.4K | ﹤0.01% |
+2,000
| New | +$80.6K |
|
|
VRTL
5645
GraniteShares 2x Long VRT Daily ETF
VRTL
$52.3M
| $92.4K | ﹤0.01% |
1,773
+1,077
| +155% | +$55.1K |
|
5646
Ingredion
INGR
$6.39B
| $92.3K | ﹤0.01% |
975
+962
| +7,400% | +$102K |
|
5647
Fox Factory Holding Corp
FOXF
$905M
| $92.3K | ﹤0.01% |
5,445
+5,339
| +5,037% | +$92.9K |
|
5648
Warner Music
WMG
$15.1B
| $92.2K | ﹤0.01% |
+3,407
| New | +$101K |
|
5649
OR Royalties Inc
OR
$6.99B
| $92.1K | ﹤0.01% |
+2,912
| New | +$108K |
|
|
ATYR
5650
CALL
aTyr Pharma
ATYR
$48.8M
| $92.1K | ﹤0.01% |
154,200
-1,300
| -0.8% | -$849 |
|
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.