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 | |
|---|---|---|---|---|---|---|
|
VWAV
5251
CALL
VisionWave Holdings
VWAV
$17.5M
| $128K | ﹤0.01% |
29,700
-21,300
| -42% | -$121K |
|
5252
CALL
Tilly's
TLYS
$135M
| $128K | ﹤0.01% |
30,400
+29,300
| +2,664% | +$133K |
|
5253
GH Research
GHRS
$1.94B
| $127K | ﹤0.01% |
4,739
+4,656
| +5,610% | +$97.2K |
|
5254
CALL
Credit Acceptance
CACC
$6.28B
| $127K | ﹤0.01% |
200
-800
| -80% | -$428K |
|
5255
CALL
Public Storage
PSA
$55.6B
| $127K | ﹤0.01% |
400
-300
| -43% | -$91.8K |
|
5256
PUT
Immuneering
IMRX
$312M
| $127K | ﹤0.01% |
25,500
-7,800
| -23% | -$39.5K |
|
5257
PUT
Albertsons Companies
ACI
$6.09B
| $127K | ﹤0.01% |
9,400
-4,700
| -33% | -$75.2K |
|
5258
PUT
Immunome
IMNM
$3.04B
| $127K | ﹤0.01% |
6,000
-14,400
| -71% | -$308K |
|
5259
PUT
Millicom
TIGO
$15.9B
| $127K | ﹤0.01% |
1,400
-900
| -39% | -$75.8K |
|
|
CEPT
5260
DELISTED
Cantor Equity Partners II
CEPT
| $127K | ﹤0.01% |
+9,454
| New | +$112K |
|
5261
PUT
3D Systems Corp
DDD
$575M
| $127K | ﹤0.01% |
42,000
+9,600
| +30% | +$26.2K |
|
5262
PUT
RenaissanceRe
RNR
$13.7B
| $127K | ﹤0.01% |
+400
| New | +$120K |
|
5263
CALL
ThredUp
TDUP
$357M
| $127K | ﹤0.01% |
18,500
+17,100
| +1,221% | +$80K |
|
5264
Compass Therapeutics
CMPX
$429M
| $127K | ﹤0.01% |
57,790
+31,939
| +124% | +$94.3K |
|
5265
Bruker
BRKR
$8.91B
| $127K | ﹤0.01% |
2,103
-4,626
| -69% | -$216K |
|
5266
PUT
Ligand Pharmaceuticals
LGND
$5.69B
| $126K | ﹤0.01% |
400
+300
| +300% | +$70.7K |
|
|
BEG
5267
Leverage Shares 2x Long BE Daily ETF
BEG
$42.8M
| $126K | ﹤0.01% |
+1,512
| New | +$113K |
|
5268
iShares MSCI Malaysia ETF
EWM
$321M
| $126K | ﹤0.01% |
4,686
-11,789
| -72% | -$338K |
|
5269
CALL
B&G Foods
BGS
$267M
| $126K | ﹤0.01% |
31,700
-27,200
| -46% | -$126K |
|
5270
SEALSQ Corp
LAES
$539M
| $126K | ﹤0.01% |
40,017
-40,189
| -50% | -$120K |
|
5271
CALL
Agilysys
AGYS
$3.14B
| $125K | ﹤0.01% |
1,200
-1,200
| -50% | -$92.9K |
|
5272
CALL
BRC Inc
BRCC
$125M
| $125K | ﹤0.01% |
11,290
+3,150
| +39% | +$39K |
|
5273
CALL
Dentsply Sirona
XRAY
$2.27B
| $125K | ﹤0.01% |
11,800
-4,400
| -27% | -$48K |
|
5274
Invesco Aerospace & Defense ETF
PPA
$7.91B
| $125K | ﹤0.01% |
708
+391
| +123% | +$67K |
|
5275
Grayscale Bitcoin Trust
GBTC
$12B
| $125K | ﹤0.01% |
+2,746
| New | +$153K |
|
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.