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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 | |
|---|---|---|---|---|---|---|---|
5376
PUT
E.W. Scripps
SSP
$234M
| $115K | ﹤0.01% |
41,400
-800
| -2% | -$3.03K |
2024 Q4
6 quarters
|
|
5377
CALL
Lennox International
LII
$11.9B
| $115K | ﹤0.01% |
200
-400
| -67% | -$204K |
2023 Q2
12 quarters
|
|
5378
Alarm.com
ALRM
$3.27B
| $115K | ﹤0.01% |
+2,451
| New | +$110K |
2026 Q2
0 quarters
|
|
5379
Middleby
MIDD
$5.32B
| $114K | ﹤0.01% |
+664
| New | +$100K |
2026 Q2
0 quarters
|
|
5380
Pyxis Oncology
PYXS
$158M
| $114K | ﹤0.01% |
37,902
+37,649
| +14,881% | +$72K |
2024 Q2
8 quarters
|
|
5381
PUT
GFL Environmental
GFL
$19.6B
| $114K | ﹤0.01% |
+3,100
| New | +$117K |
2026 Q2
0 quarters
|
|
5382
CALL
Universal Health Realty Income Trust
UHT
$526M
| $114K | ﹤0.01% |
+2,600
| New | +$107K |
2026 Q2
0 quarters
|
|
5383
PUT
Vanguard FTSE Developed Markets ETF
VEA
$231B
| $114K | ﹤0.01% |
1,600
-8,700
| -84% | -$606K |
2019 Q2
28 quarters
|
|
5384
Global X Blockchain ETF
BKCH
$198M
| $114K | ﹤0.01% |
1,523
+476
| +45% | +$37.7K |
2025 Q3
3 quarters
|
|
5385
CALL
Pangaea Logistics
PANL
$526M
| $114K | ﹤0.01% |
17,500
+1,500
| +9% | +$11.4K |
2026 Q1
1 quarter
|
|
5386
CALL
Veritone
VERI
$68.1M
| $114K | ﹤0.01% |
83,000
+30,900
| +59% | +$59K |
2018 Q4
30 quarters
|
|
5387
Bausch + Lomb
BLCO
$7.29B
| $114K | ﹤0.01% |
+6,855
| New | +$109K |
2026 Q2
0 quarters
|
|
5388
CALL
Autolus Therapeutics
AUTL
$421M
| $113K | ﹤0.01% |
70,900
-2,000
| -3% | -$3.14K |
2024 Q3
7 quarters
|
|
5389
PUT
Urban Outfitters
URBN
$7.9B
| $113K | ﹤0.01% |
1,600
-600
| -27% | -$42.8K |
2021 Q1
21 quarters
|
|
5390
PUT
Tarsus Pharmaceuticals
TARS
$3.47B
| $113K | ﹤0.01% |
+1,800
| New | +$115K |
2026 Q2
0 quarters
|
|
5391
AGF US Market Neutral Anti-Beta Fund
BTAL
$333M
| $113K | ﹤0.01% |
10,151
+9,261
| +1,041% | +$113K |
2025 Q2
4 quarters
|
|
5392
Accel Entertainment
ACEL
$917M
| $113K | ﹤0.01% |
+8,971
| New | +$109K |
2026 Q2
0 quarters
|
|
5393
Yeti Holdings
YETI
$3.23B
| $113K | ﹤0.01% |
+2,281
| New | +$98.9K |
2026 Q2
0 quarters
|
|
5394
PUT
Acuity Brands
AYI
$9.8B
| $113K | ﹤0.01% |
+300
| New | +$88.9K |
2026 Q2
0 quarters
|
|
5395
Coca-Cola Femsa
KOF
$24.3B
| $113K | ﹤0.01% |
+1,063
| New | +$111K |
2026 Q2
0 quarters
|
|
5396
Xponential Fitness
XPOF
$158M
| $113K | ﹤0.01% |
+16,298
| New | +$103K |
2026 Q2
0 quarters
|
|
5397
iShares U.S. Power Infrastructure ETF
POWR
$448M
| $113K | ﹤0.01% |
+4,029
| New | +$110K |
2026 Q2
0 quarters
|
|
5398
CALL
Universal Display
OLED
$3.82B
| $113K | ﹤0.01% |
1,300
+100
| +8% | +$9.23K |
2014 Q4
46 quarters
|
|
5399
PUT
Eagle Materials
EXP
$5.58B
| $112K | ﹤0.01% |
500
-600
| -55% | -$125K |
2023 Q1
13 quarters
|
|
5400
PUT
Progyny
PGNY
$2.18B
| $112K | ﹤0.01% |
+3,900
| New | +$87.1K |
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.