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Simplex Trading Portfolio holdings
AUM
$171B
Turnover
30.09%
1-Year Est. Return
85%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
(+14%)
Cap. Flow
-$29.5M
Cap. Flow % of AUM
Cap. Flow %
-0.02%
Top 10 Holdings %
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held
Equity + Options
2.9
years
Top 10 Avg Time Held
Equity + Options
3.8
years
Top 20 Avg Time Held
Equity + Options
4.1
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.3
years
Top 20 Avg Time Held Equity only
0.3
years
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 | Held Since | |
|---|---|---|---|---|---|---|---|
|
VWAV
5251
CALL
VisionWave Holdings
VWAV
$7.51M
| $128K | ﹤0.01% |
1,485
-1,065
| -42% | -$121K |
2025 Q3
3 quarters
|
|
5252
CALL
Tilly's
TLYS
$133M
| $128K | ﹤0.01% |
30,400
+29,300
| +2,664% | +$133K |
2026 Q1
1 quarter
|
|
5253
GH Research
GHRS
$1.48B
| $127K | ﹤0.01% |
4,739
+4,656
| +5,610% | +$97.2K |
2025 Q1
5 quarters
|
|
5254
CALL
Credit Acceptance
CACC
$5.66B
| $127K | ﹤0.01% |
200
-800
| -80% | -$428K |
2021 Q1
21 quarters
|
|
5255
CALL
Public Storage
PSA
$59.2B
| $127K | ﹤0.01% |
400
-300
| -43% | -$91.8K |
2014 Q4
46 quarters
|
|
5256
PUT
Immuneering
IMRX
$260M
| $127K | ﹤0.01% |
25,500
-7,800
| -23% | -$39.5K |
2025 Q4
2 quarters
|
|
5257
PUT
Albertsons Companies
ACI
$6.21B
| $127K | ﹤0.01% |
9,400
-4,700
| -33% | -$75.2K |
2020 Q3
23 quarters
|
|
5258
PUT
Immunome
IMNM
$2.16B
| $127K | ﹤0.01% |
6,000
-14,400
| -71% | -$308K |
2024 Q1
9 quarters
|
|
5259
PUT
Millicom
TIGO
$13.4B
| $127K | ﹤0.01% |
1,400
-900
| -39% | -$75.8K |
2025 Q2
4 quarters
|
|
|
CEPT
5260
DELISTED
Cantor Equity Partners II
CEPT
| $127K | ﹤0.01% |
+9,454
| New | +$112K |
2026 Q2
0 quarters
|
|
5261
PUT
3D Systems Corp
DDD
$487M
| $127K | ﹤0.01% |
42,000
+9,600
| +30% | +$26.2K |
2014 Q4
46 quarters
|
|
5262
PUT
RenaissanceRe
RNR
$13.7B
| $127K | ﹤0.01% |
+400
| New | +$120K |
2026 Q2
0 quarters
|
|
5263
CALL
ThredUp
TDUP
$292M
| $127K | ﹤0.01% |
18,500
+17,100
| +1,221% | +$80K |
2024 Q3
7 quarters
|
|
5264
Compass Therapeutics
CMPX
$136M
| $127K | ﹤0.01% |
57,790
+31,939
| +124% | +$94.3K |
2025 Q2
4 quarters
|
|
5265
Bruker
BRKR
$9.45B
| $127K | ﹤0.01% |
2,103
-4,626
| -69% | -$216K |
2025 Q3
3 quarters
|
|
5266
PUT
Ligand Pharmaceuticals
LGND
$6.33B
| $126K | ﹤0.01% |
400
+300
| +300% | +$70.7K |
2025 Q4
2 quarters
|
|
5267
Leverage Shares 2x Long BE Daily ETF
BEG
$28.4M
| $126K | ﹤0.01% |
+1,512
| New | +$113K |
2026 Q2
0 quarters
|
|
5268
iShares MSCI Malaysia ETF
EWM
$229M
| $126K | ﹤0.01% |
4,686
-11,789
| -72% | -$338K |
2026 Q1
1 quarter
|
|
5269
CALL
B&G Foods
BGS
$184M
| $126K | ﹤0.01% |
31,700
-27,200
| -46% | -$126K |
2015 Q2
44 quarters
|
|
5270
SEALSQ Corp
LAES
$353M
| $126K | ﹤0.01% |
40,017
-40,189
| -50% | -$120K |
2025 Q3
3 quarters
|
|
5271
CALL
Agilysys
AGYS
$3.27B
| $125K | ﹤0.01% |
1,200
-1,200
| -50% | -$92.9K |
2024 Q2
8 quarters
|
|
5272
CALL
BRC Inc
BRCC
$185M
| $125K | ﹤0.01% |
11,290
+3,150
| +39% | +$39K |
2022 Q1
17 quarters
|
|
5273
CALL
Dentsply Sirona
XRAY
$1.92B
| $125K | ﹤0.01% |
11,800
-4,400
| -27% | -$48K |
2018 Q2
32 quarters
|
|
5274
Invesco Aerospace & Defense ETF
PPA
$7.68B
| $125K | ﹤0.01% |
708
+391
| +123% | +$67K |
2026 Q1
1 quarter
|
|
5275
Grayscale Bitcoin Trust
GBTC
$12.1B
| $125K | ﹤0.01% |
+2,746
| New | +$153K |
2026 Q2
0 quarters
|
|
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.