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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 | |
|---|---|---|---|---|---|---|---|
5301
CALL
SPX Corp
SPXC
$7.94B
| $123K | ﹤0.01% |
500
-300
| -38% | -$65.6K |
2025 Q4
2 quarters
|
|
5302
CALL
United States 12 Month Oil Fund,
USL
$48.8M
| $122K | ﹤0.01% |
+2,700
| New | +$138K |
2026 Q2
0 quarters
|
|
5303
PUT
Bank of Hawaii
BOH
$2.74B
| $122K | ﹤0.01% |
1,500
-100
| -6% | -$7.83K |
2022 Q4
14 quarters
|
|
5304
CALL
National Health Investors
NHI
$3.3B
| $122K | ﹤0.01% |
1,600
+1,000
| +167% | +$76.6K |
2025 Q2
4 quarters
|
|
5305
PUT
Healthpeak Properties
DOC
$13.1B
| $122K | ﹤0.01% |
5,700
+4,400
| +338% | +$82.1K |
2014 Q4
46 quarters
|
|
5306
CALL
California Resources
CRC
$4.91B
| $122K | ﹤0.01% |
2,300
+700
| +44% | +$43.1K |
2021 Q1
21 quarters
|
|
5307
CALL
Pershing Square
PS
$17.6B
| $122K | ﹤0.01% |
+3,700
| New | +$135K |
2026 Q2
0 quarters
|
|
5308
CALL
Yalla Group
YALA
$834M
| $121K | ﹤0.01% |
22,100
+20,000
| +952% | +$124K |
2025 Q2
4 quarters
|
|
5309
PUT
iShares Core Dividend ETF
DIVB
$2.24B
| $121K | ﹤0.01% |
1,800
+800
| +80% | +$47K |
2021 Q3
19 quarters
|
|
5310
PUT
Sky Harbour Group
SKYH
$391M
| $121K | ﹤0.01% |
12,300
-1,400
| -10% | -$13.7K |
2026 Q1
1 quarter
|
|
5311
PUT
Trinity Industries
TRN
$2.27B
| $121K | ﹤0.01% |
3,500
-100
| -3% | -$3.38K |
2025 Q3
3 quarters
|
|
5312
CALL
Oramed Pharmaceuticals
ORMP
$171M
| $121K | ﹤0.01% |
25,100
+25,000
| +25,000% | +$100K |
2025 Q1
5 quarters
|
|
5313
Sidus Space
SIDU
$108M
| $120K | ﹤0.01% |
+42,793
| New | +$164K |
2026 Q2
0 quarters
|
|
5314
ABM Industries
ABM
$3.15B
| $120K | ﹤0.01% |
2,717
+2,176
| +402% | +$89.2K |
2025 Q4
2 quarters
|
|
5315
PUT
Compañía de Minas Buenaventura
BVN
$6.61B
| $120K | ﹤0.01% |
4,100
+300
| +8% | +$10.2K |
2026 Q1
1 quarter
|
|
5316
PUT
KULR Technology Group
KULR
$74M
| $120K | ﹤0.01% |
31,500
+2,300
| +8% | +$7.66K |
2024 Q2
8 quarters
|
|
5317
CALL
Orchid Island Capital
ORC
$930M
| $120K | ﹤0.01% |
17,200
+11,500
| +202% | +$79.3K |
2019 Q4
26 quarters
|
|
5318
PUT
Axalta
AXTA
$7.2B
| $120K | ﹤0.01% |
3,500
+3,400
| +3,400% | +$102K |
2016 Q1
41 quarters
|
|
5319
PUT
ADMA Biologics
ADMA
$2.55B
| $120K | ﹤0.01% |
14,300
-80,700
| -85% | -$736K |
2024 Q1
9 quarters
|
|
5320
CALL
Equillium
EQ
$104M
| $120K | ﹤0.01% |
37,400
-177,100
| -83% | -$424K |
2025 Q3
3 quarters
|
|
5321
CALL
StandardAero Inc
SARO
$7.68B
| $120K | ﹤0.01% |
4,000
+1,600
| +67% | +$42.1K |
2024 Q4
6 quarters
|
|
5322
PUT
IMAX
IMAX
$2.78B
| $120K | ﹤0.01% |
+3,000
| New | +$115K |
2026 Q2
0 quarters
|
|
5323
PUT
Starfighters Space Inc
FJET
$44.4M
| $119K | ﹤0.01% |
22,400
+19,600
| +700% | +$117K |
2025 Q4
2 quarters
|
|
5324
CALL
Tactile Systems Technology
TCMD
$519M
| $119K | ﹤0.01% |
4,000
-20,500
| -84% | -$515K |
2024 Q4
6 quarters
|
|
5325
CALL
Regal Rexnord
RRX
$10.2B
| $119K | ﹤0.01% |
500
+400
| +400% | +$83.6K |
2021 Q4
18 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.