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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 | |
|---|---|---|---|---|---|---|---|
5676
CALL
A2Z Smart Technologies
AZ
$271M
| $90.2K | ﹤0.01% |
15,500
-5,200
| -25% | -$35.5K |
2026 Q1
1 quarter
|
|
5677
CALL
Plexus
PLXS
$6.38B
| $90.2K | ﹤0.01% |
+300
| New | +$78.2K |
2026 Q2
0 quarters
|
|
5678
DELISTED
AvalonBay Communities
AVB
| $90.2K | ﹤0.01% |
478
-385
| -45% | -$69.6K |
2026 Q1
1 quarter
|
|
5679
VinFast Auto
VFS
$7.86B
| $90.2K | ﹤0.01% |
28,903
+6,520
| +29% | +$24.5K |
2024 Q1
9 quarters
|
|
5680
Janus Henderson AAA CLO ETF
JAAA
$32.6B
| $90.1K | ﹤0.01% |
1,785
-649
| -27% | -$32.8K |
2025 Q2
4 quarters
|
|
|
ORLA
5681
PUT
DELISTED
Orla Mining
ORLA
| $90.1K | ﹤0.01% |
9,200
-34,100
| -79% | -$454K |
2024 Q4
6 quarters
|
|
5682
Vanguard FTSE All-World ex-US ETF
VEU
$67.3B
| $90K | ﹤0.01% |
1,075
-1
| -0.1% | -$82 |
2026 Q1
1 quarter
|
|
5683
CALL
Clean Harbors
CLH
$16.5B
| $89.6K | ﹤0.01% |
300
+200
| +200% | +$59.1K |
2026 Q1
1 quarter
|
|
5684
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$66.3M
| $89.6K | ﹤0.01% |
1,300
+400
| +44% | +$28.2K |
2026 Q1
1 quarter
|
|
5685
Defiance Daily Target 2X Long ORCL ETF
ORCX
$251M
| $89.6K | ﹤0.01% |
+3,856
| New | +$150K |
2026 Q2
0 quarters
|
|
5686
CALL
Tetra Tech
TTEK
$9.42B
| $89.6K | ﹤0.01% |
3,100
+2,500
| +417% | +$73.4K |
2023 Q2
12 quarters
|
|
5687
Steven Madden
SHOO
$3.12B
| $89.5K | ﹤0.01% |
2,127
+1,800
| +550% | +$72.8K |
2026 Q1
1 quarter
|
|
|
5688
PUT
VinFast Auto
VFS
$7.86B
| $89.5K | ﹤0.01% |
28,700
-18,200
| -39% | -$68.4K |
2023 Q3
11 quarters
|
|
5689
PUT
Trilogy Metals
TMQ
$423M
| $89.5K | ﹤0.01% |
25,500
-28,400
| -53% | -$117K |
2025 Q3
3 quarters
|
|
5690
PUT
IDEAYA Biosciences
IDYA
$3.28B
| $89.4K | ﹤0.01% |
2,400
-27,800
| -92% | -$851K |
2025 Q2
4 quarters
|
|
5691
Boston Omaha
BOC
$384M
| $89.4K | ﹤0.01% |
6,555
+4,550
| +227% | +$57.3K |
2025 Q2
4 quarters
|
|
5692
CALL
Atlas Lithium Corp
ATLX
$57.2M
| $89.3K | ﹤0.01% |
24,200
+9,800
| +68% | +$43.7K |
2023 Q4
10 quarters
|
|
5693
PUT
Sonos
SONO
$2.1B
| $89.3K | ﹤0.01% |
6,600
+4,400
| +200% | +$64.4K |
2018 Q3
31 quarters
|
|
5694
CALL
Associated Banc-Corp
ASB
$5.57B
| $89.2K | ﹤0.01% |
2,900
-1,700
| -37% | -$47.9K |
2018 Q4
30 quarters
|
|
5695
CALL
Stepan Co
SCL
$1.56B
| $89.2K | ﹤0.01% |
1,600
-300
| -16% | -$15.6K |
2025 Q4
2 quarters
|
|
5696
PUT
Invesco CurrencyShares Australian Dollar Trust
FXA
$94.4M
| $89.2K | ﹤0.01% |
1,300
+1,000
| +333% | +$70.3K |
2026 Q1
1 quarter
|
|
5697
PUT
Dimensional US Core Equity Market ETF
DFAU
$13.1B
| $89.1K | ﹤0.01% |
2,200
+200
| +10% | +$10K |
2025 Q1
5 quarters
|
|
5698
CALL
Perimeter Solutions
PRM
$4.67B
| $89.1K | ﹤0.01% |
2,500
-1,400
| -36% | -$43.7K |
2023 Q3
11 quarters
|
|
5699
CALL
Slide Insurance Holdings
SLDE
$3.19B
| $89.1K | ﹤0.01% |
4,600
-17,700
| -79% | -$321K |
2025 Q3
3 quarters
|
|
5700
CALL
Atossa Therapeutics
ATOS
$23.7M
| $89K | ﹤0.01% |
48,300
-34,800
| -42% | -$159K |
2021 Q1
21 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.