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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 | |
|---|---|---|---|---|---|---|---|
5751
CALL
Enanta Pharmaceuticals
ENTA
$336M
| $84.6K | ﹤0.01% |
5,800
+5,700
| +5,700% | +$76.6K |
2025 Q1
5 quarters
|
|
5752
PUT
Kayne Anderson Energy Infrastructure Fund
KYN
$2.43B
| $84.4K | ﹤0.01% |
6,100
+5,400
| +771% | +$74.8K |
2026 Q1
1 quarter
|
|
5753
Baozun
BZUN
$191M
| $84.3K | ﹤0.01% |
29,794
-81,085
| -73% | -$219K |
2024 Q4
6 quarters
|
|
5754
Omeros
OMER
$1.29B
| $84.2K | ﹤0.01% |
8,859
-28,667
| -76% | -$341K |
2025 Q3
3 quarters
|
|
5755
CALL
LifeVantage
LFVN
$74.2M
| $84.2K | ﹤0.01% |
13,500
+13,400
| +13,400% | +$81.1K |
2026 Q1
1 quarter
|
|
5756
Direxion Daily Magnificent 7 Bear 1X ETF
QQQD
$27.4M
| $84.2K | ﹤0.01% |
6,379
+1,312
| +26% | +$17K |
2026 Q1
1 quarter
|
|
5757
PUT
Sana Biotechnology
SANA
$787M
| $84.1K | ﹤0.01% |
24,100
+19,100
| +382% | +$61.5K |
2024 Q1
9 quarters
|
|
5758
CALL
Playtika
PLTK
$778M
| $84.1K | ﹤0.01% |
22,600
-1,100
| -5% | -$3.8K |
2021 Q1
21 quarters
|
|
5759
PUT
Priority Technology Holdings
PRTH
$647M
| $84K | ﹤0.01% |
12,600
-300
| -2% | -$1.74K |
2026 Q1
1 quarter
|
|
5760
CALL
Versigent PLC
VGNT
$2.94B
| $84K | ﹤0.01% |
+2,000
| New | +$79.7K |
2026 Q2
0 quarters
|
|
5761
LeMaitre Vascular
LMAT
$1.9B
| $84K | ﹤0.01% |
+875
| New | +$89.7K |
2026 Q2
0 quarters
|
|
5762
Legend Biotech
LEGN
$4.38B
| $84K | ﹤0.01% |
+2,907
| New | +$78.4K |
2026 Q2
0 quarters
|
|
5763
IMAX
IMAX
$2.77B
| $83.9K | ﹤0.01% |
+2,105
| New | +$80.7K |
2026 Q2
0 quarters
|
|
5764
PUT
UDR
UDR
$11.2B
| $83.8K | ﹤0.01% |
2,100
+1,600
| +320% | +$59.2K |
2025 Q2
4 quarters
|
|
5765
PUT
Adicet Bio
ACET
$35.7M
| $83.8K | ﹤0.01% |
9,700
+9,300
| +2,325% | +$73.3K |
2025 Q4
2 quarters
|
|
5766
PUT
Forward Air
FWRD
$593M
| $83.8K | ﹤0.01% |
6,200
-14,600
| -70% | -$218K |
2023 Q3
11 quarters
|
|
5767
PUT
Flowers Foods
FLO
$1.3B
| $83.7K | ﹤0.01% |
10,600
-45,700
| -81% | -$366K |
2022 Q1
17 quarters
|
|
5768
PUT
Septerna Inc
SEPN
$2.07B
| $83.7K | ﹤0.01% |
+2,500
| New | +$70.9K |
2026 Q2
0 quarters
|
|
5769
CALL
Lifecore Biomedical
LFCR
$247M
| $83.5K | ﹤0.01% |
15,900
+15,400
| +3,080% | +$77.6K |
2026 Q1
1 quarter
|
|
5770
PUT
RoboStrategy Inc
BOT
$584M
| $83.5K | ﹤0.01% |
+2,100
| New | +$64.8K |
2026 Q2
0 quarters
|
|
5771
PUT
DoubleVerify
DV
$2.11B
| $83.5K | ﹤0.01% |
7,700
-3,800
| -33% | -$39.1K |
2021 Q2
20 quarters
|
|
5772
PUT
Watsco Inc
WSO
$12.1B
| $83.3K | ﹤0.01% |
200
-200
| -50% | -$80.4K |
2025 Q4
2 quarters
|
|
5773
Universal Corp
UVV
$985M
| $83.2K | ﹤0.01% |
1,594
-2,834
| -64% | -$151K |
2026 Q1
1 quarter
|
|
5774
State Street SPDR S&P Global Infrastructure ETF
GII
$948M
| $83.1K | ﹤0.01% |
1,098
+999
| +1,009% | +$76.1K |
2025 Q4
2 quarters
|
|
5775
Amplitude
AMPL
$2.18B
| $83.1K | ﹤0.01% |
10,862
+4,357
| +67% | +$30.1K |
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.