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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 | |
|---|---|---|---|---|---|---|---|
5451
PUT
Oshkosh
OSK
$8.35B
| $107K | ﹤0.01% |
700
-400
| -36% | -$56.4K |
2017 Q4
34 quarters
|
|
5452
CALL
NexPoint Diversified Real Estate Trust
NXDT
$229M
| $107K | ﹤0.01% |
20,700
+11,200
| +118% | +$55.2K |
2024 Q4
6 quarters
|
|
5453
CALL
Assurant
AIZ
$14.4B
| $107K | ﹤0.01% |
+400
| New | +$97.4K |
2026 Q2
0 quarters
|
|
5454
ROBO Global Robotics & Automation Index ETF
ROBO
$1.96B
| $107K | ﹤0.01% |
1,253
+254
| +25% | +$20.9K |
2026 Q1
1 quarter
|
|
5455
CALL
Metalla Royalty & Streaming
MTA
$722M
| $107K | ﹤0.01% |
14,100
-18,700
| -57% | -$132K |
2026 Q1
1 quarter
|
|
5456
CALL
Electrovaya
ELVA
$281M
| $107K | ﹤0.01% |
10,200
+4,200
| +70% | +$41.6K |
2026 Q1
1 quarter
|
|
5457
CALL
DELISTED
Cross Country Healthcare
CCRN
| $107K | ﹤0.01% |
+8,100
| New | +$95.9K |
2026 Q2
0 quarters
|
|
5458
CALL
Invivyd
IVVD
$177M
| $107K | ﹤0.01% |
122,700
-54,300
| -31% | -$68.1K |
2025 Q1
5 quarters
|
|
5459
CALL
Aclaris Therapeutics
ACRS
$587M
| $107K | ﹤0.01% |
20,200
+700
| +4% | +$3.12K |
2020 Q4
22 quarters
|
|
5460
FuboTV Inc
FUBO
$240M
| $107K | ﹤0.01% |
11,615
-11,447
| -50% | -$122K |
2024 Q4
6 quarters
|
|
5461
PUT
Vertex
VERX
$2.41B
| $107K | ﹤0.01% |
9,300
+9,000
| +3,000% | +$112K |
2024 Q4
6 quarters
|
|
5462
CALL
Terra Innovatum Global N.V.
NKLR
$257M
| $107K | ﹤0.01% |
21,700
+12,100
| +126% | +$68.5K |
2025 Q4
2 quarters
|
|
5463
CALL
GFL Environmental
GFL
$19.6B
| $107K | ﹤0.01% |
2,900
+2,700
| +1,350% | +$102K |
2020 Q2
24 quarters
|
|
5464
CALL
Ovid Therapeutics
OVID
$500M
| $107K | ﹤0.01% |
39,600
+35,200
| +800% | +$90.8K |
2025 Q3
3 quarters
|
|
5465
PUT
Ardmore Shipping
ASC
$870M
| $106K | ﹤0.01% |
7,600
+5,800
| +322% | +$98.4K |
2020 Q2
24 quarters
|
|
5466
PUT
Service Corp International
SCI
$10.2B
| $106K | ﹤0.01% |
1,400
-12,300
| -90% | -$962K |
2021 Q2
20 quarters
|
|
5467
PUT
EXL Service
EXLS
$6.2B
| $106K | ﹤0.01% |
4,100
+3,500
| +583% | +$103K |
2025 Q2
4 quarters
|
|
5468
PUT
Corbus Pharmaceuticals
CRBP
$81.6M
| $106K | ﹤0.01% |
11,300
-4,700
| -29% | -$44.5K |
2026 Q1
1 quarter
|
|
5469
Core Natural Resources Inc
CNR
$4.33B
| $106K | ﹤0.01% |
1,323
+105
| +9% | +$9.3K |
2025 Q4
2 quarters
|
|
5470
CALL
CBIZ
CBZ
$3.02B
| $106K | ﹤0.01% |
3,300
+400
| +14% | +$12.4K |
2025 Q3
3 quarters
|
|
5471
ProShares Short SmallCap600
SBB
$3.74M
| $106K | ﹤0.01% |
+4,800
| New | +$115K |
2026 Q2
0 quarters
|
|
5472
PUT
Adtran
ADTN
$565M
| $106K | ﹤0.01% |
7,600
+5,100
| +204% | +$79.6K |
2025 Q1
5 quarters
|
|
5473
CALL
IPG Photonics
IPGP
$3.22B
| $106K | ﹤0.01% |
900
+800
| +800% | +$91.9K |
2025 Q3
3 quarters
|
|
5474
PUT
Lightbridge
LTBR
$190M
| $105K | ﹤0.01% |
12,000
-10,600
| -47% | -$119K |
2024 Q2
8 quarters
|
|
5475
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.82B
| $105K | ﹤0.01% |
2,700
-15,800
| -85% | -$632K |
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.