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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 | |
|---|---|---|---|---|---|---|---|
5351
ARKO Corp
ARKO
$424M
| $116K | ﹤0.01% |
14,492
-3,384
| -19% | -$23.7K |
2025 Q4
2 quarters
|
|
5352
PUT
Church & Dwight Co
CHD
$25.1B
| $116K | ﹤0.01% |
1,200
+1,000
| +500% | +$95.6K |
2016 Q1
41 quarters
|
|
5353
PUT
Everus Construction Group
ECG
$5.52B
| $116K | ﹤0.01% |
700
-300
| -30% | -$44K |
2026 Q1
1 quarter
|
|
5354
PUT
Valaris
VAL
$7.06B
| $116K | ﹤0.01% |
1,600
-15,200
| -90% | -$1.41M |
2022 Q1
17 quarters
|
|
5355
PUT
Claritev Corp
CTEV
$407M
| $116K | ﹤0.01% |
3,400
+3,200
| +1,600% | +$78.4K |
2024 Q3
7 quarters
|
|
5356
CALL
Ituran Location and Control
ITRN
$1.06B
| $116K | ﹤0.01% |
1,900
-300
| -14% | -$17.8K |
2023 Q4
10 quarters
|
|
5357
PUT
Vera Therapeutics
VERA
$2.2B
| $116K | ﹤0.01% |
2,700
+2,500
| +1,250% | +$93.2K |
2023 Q4
10 quarters
|
|
5358
Perspective Therapeutics
CATX
$134M
| $116K | ﹤0.01% |
33,940
-8,546
| -20% | -$32.3K |
2026 Q1
1 quarter
|
|
5359
Xunlei
XNET
$232M
| $116K | ﹤0.01% |
20,677
+7,317
| +55% | +$42.2K |
2026 Q1
1 quarter
|
|
5360
CALL
First Interstate BancSystem
FIBK
$3.55B
| $116K | ﹤0.01% |
3,000
+600
| +25% | +$21.2K |
2025 Q3
3 quarters
|
|
|
5361
PUT
First Interstate BancSystem
FIBK
$3.55B
| $116K | ﹤0.01% |
+3,000
| New | +$106K |
2026 Q2
0 quarters
|
|
5362
PUT
Fortress Biotech
FBIO
$66.7M
| $116K | ﹤0.01% |
37,800
-1,200
| -3% | -$3.1K |
2025 Q3
3 quarters
|
|
5363
PUT
NerdWallet
NRDS
$726M
| $116K | ﹤0.01% |
12,500
+10,200
| +443% | +$95.5K |
2021 Q4
18 quarters
|
|
5364
CALL
ONE Gas
OGS
$4.91B
| $116K | ﹤0.01% |
1,500
-200
| -12% | -$16.6K |
2025 Q3
3 quarters
|
|
5365
PUT
Valmont Industries
VMI
$8.28B
| $116K | ﹤0.01% |
+200
| New | +$101K |
2026 Q2
0 quarters
|
|
5366
Astronics
ATRO
$2.7B
| $115K | ﹤0.01% |
+1,420
| New | +$96.9K |
2026 Q2
0 quarters
|
|
5367
Morningstar
MORN
$8.26B
| $115K | ﹤0.01% |
+739
| New | +$128K |
2026 Q2
0 quarters
|
|
5368
PUT
Lifezone Metals
LZM
$328M
| $115K | ﹤0.01% |
29,700
+28,100
| +1,756% | +$131K |
2026 Q1
1 quarter
|
|
5369
PUT
Evolus
EOLS
$497M
| $115K | ﹤0.01% |
16,600
-4,000
| -19% | -$23.6K |
2021 Q1
21 quarters
|
|
5370
REX Drone ETF
DRNZ
$93.8M
| $115K | ﹤0.01% |
5,114
+392
| +8% | +$9.8K |
2026 Q1
1 quarter
|
|
5371
PUT
Caleres
CAL
$470M
| $115K | ﹤0.01% |
9,300
+4,300
| +86% | +$55.8K |
2018 Q1
33 quarters
|
|
5372
iShares Core S&P Total US Stock Market ETF
ITOT
$97.1B
| $115K | ﹤0.01% |
+700
| New | +$111K |
2026 Q2
0 quarters
|
|
5373
GraniteShares 2x Long TSM Daily ETF
TSMU
$38.9M
| $115K | ﹤0.01% |
1,246
-224
| -15% | -$15.7K |
2025 Q1
5 quarters
|
|
5374
O-I Glass
OI
$814M
| $115K | ﹤0.01% |
11,921
+3,871
| +48% | +$36.4K |
2024 Q2
8 quarters
|
|
5375
CALL
Once Upon a Farm PBC
OFRM
$671M
| $115K | ﹤0.01% |
5,600
+200
| +4% | +$3.28K |
2026 Q1
1 quarter
|
|
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.