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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 | |
|---|---|---|---|---|---|---|---|
5801
Amplify Blockchain Technology ETF
BLOK
$950M
| $80.7K | ﹤0.01% |
1,288
+98
| +8% | +$6.05K |
2025 Q2
4 quarters
|
|
5802
PUT
Broadwind
BWEN
$76.6M
| $80.7K | ﹤0.01% |
+16,700
| New | +$55.3K |
2026 Q2
0 quarters
|
|
5803
Corteva
CTVA
$7.56B
| $80.6K | ﹤0.01% |
952
-2,003
| -68% | -$161K |
2025 Q2
4 quarters
|
|
5804
PUT
Loar Holdings
LOAR
$5.74B
| $80.6K | ﹤0.01% |
1,000
-2,300
| -70% | -$147K |
2024 Q4
6 quarters
|
|
5805
Scholar Rock
SRRK
$5.27B
| $80.6K | ﹤0.01% |
+1,465
| New | +$70.8K |
2026 Q2
0 quarters
|
|
5806
PUT
Alphatec Holdings
ATEC
$1.77B
| $80.4K | ﹤0.01% |
9,300
+6,500
| +232% | +$59.2K |
2020 Q2
24 quarters
|
|
5807
PUT
Schneider National
SNDR
$5.21B
| $80.4K | ﹤0.01% |
2,200
+2,100
| +2,100% | +$68.5K |
2026 Q1
1 quarter
|
|
5808
Pegasystems
PEGA
$5.79B
| $80.3K | ﹤0.01% |
+2,678
| New | +$95.8K |
2026 Q2
0 quarters
|
|
5809
PUT
Kulicke & Soffa
KLIC
$4.16B
| $80.3K | ﹤0.01% |
600
+200
| +50% | +$19.6K |
2018 Q3
31 quarters
|
|
5810
PUT
Petco
WOOF
$719M
| $80.2K | ﹤0.01% |
29,500
-1,900
| -6% | -$5.27K |
2026 Q1
1 quarter
|
|
5811
PUT
Okeanis Eco Tankers
ECO
$3.87B
| $80.2K | ﹤0.01% |
+1,600
| New | +$83.5K |
2026 Q2
0 quarters
|
|
5812
PUT
Hexcel
HXL
$5.91B
| $80K | ﹤0.01% |
800
-800
| -50% | -$72.5K |
2023 Q1
13 quarters
|
|
5813
iShares MSCI Italy ETF
EWI
$1.2B
| $80K | ﹤0.01% |
1,351
+946
| +234% | +$55.2K |
2025 Q4
2 quarters
|
|
5814
GraniteShares 2x Long AMZN Daily ETF
AMZZ
$45.8M
| $79.6K | ﹤0.01% |
2,585
+1,867
| +260% | +$65.5K |
2026 Q1
1 quarter
|
|
5815
ProShares Ultra Ether ETF
ETHT
$242M
| $79.5K | ﹤0.01% |
10,600
+7,713
| +267% | +$108K |
2026 Q1
1 quarter
|
|
5816
CALL
Ambiq Micro
AMBQ
$1.33B
| $79.5K | ﹤0.01% |
+900
| New | +$53.3K |
2026 Q2
0 quarters
|
|
5817
PUT
Fiverr
FVRR
$290M
| $79.5K | ﹤0.01% |
7,700
-60,000
| -89% | -$638K |
2020 Q1
25 quarters
|
|
5818
Global X Lithium & Battery Tech ETF
LIT
$1.27B
| $79.4K | ﹤0.01% |
+1,014
| New | +$83.9K |
2026 Q2
0 quarters
|
|
5819
CALL
JOYY Inc
JOYY
$3.69B
| $79.2K | ﹤0.01% |
1,200
-24,400
| -95% | -$1.52M |
2021 Q1
21 quarters
|
|
5820
Owens Corning
OC
$9.17B
| $79.2K | ﹤0.01% |
498
-12,103
| -96% | -$1.47M |
2025 Q4
2 quarters
|
|
5821
CALL
Century Therapeutics
IPSC
$272M
| $79.1K | ﹤0.01% |
32,300
+28,200
| +688% | +$64.4K |
2026 Q1
1 quarter
|
|
5822
CALL
Phillips Edison & Co
PECO
$4.86B
| $79.1K | ﹤0.01% |
1,900
-2,200
| -54% | -$87.9K |
2025 Q2
4 quarters
|
|
5823
Barnes & Noble Education
BNED
$448M
| $79.1K | ﹤0.01% |
6,294
+3,987
| +173% | +$41.6K |
2024 Q4
6 quarters
|
|
5824
PUT
Granite Construction
GVA
$4.96B
| $79K | ﹤0.01% |
500
-2,400
| -83% | -$326K |
2026 Q1
1 quarter
|
|
5825
CALL
Monarch Casino & Resort
MCRI
$2.01B
| $79K | ﹤0.01% |
+600
| New | +$69.9K |
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.