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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 | |
|---|---|---|---|---|---|---|---|
5776
CALL
StoneX
SNEX
$6.76B
| $83K | ﹤0.01% |
+1,050
| New | +$78.8K |
2026 Q2
0 quarters
|
|
5777
Global X Defense Tech ETF
SHLD
$6.59B
| $82.9K | ﹤0.01% |
1,388
-11,920
| -90% | -$793K |
2025 Q2
4 quarters
|
|
5778
CALL
Vertical Aerospace
EVTL
$69.6M
| $82.8K | ﹤0.01% |
47,600
+33,000
| +226% | +$79.3K |
2025 Q3
3 quarters
|
|
5779
CALL
Cardiff Oncology
CRDF
$69.8M
| $82.7K | ﹤0.01% |
63,600
+4,800
| +8% | +$7.62K |
2020 Q3
23 quarters
|
|
5780
Labcorp
LH
$29.2B
| $82.6K | ﹤0.01% |
295
+81
| +38% | +$21.3K |
2025 Q2
4 quarters
|
|
5781
PUT
Infinity Natural Resources
INR
$271M
| $82.6K | ﹤0.01% |
+6,500
| New | +$96.7K |
2026 Q2
0 quarters
|
|
5782
CALL
Sumitomo Mitsui Financial Group, Inc American Depositary Shares (each representing 1.2 shares of Common Stock)
SMFG
$151B
| $82.5K | ﹤0.01% |
3,500
-1,100
| -24% | -$24.4K |
2026 Q1
1 quarter
|
|
5783
Prairie Operating Co
PROP
$50.5M
| $82.2K | ﹤0.01% |
113,984
-190,302
| -63% | -$205K |
2025 Q3
3 quarters
|
|
5784
Diodes
DIOD
$4.11B
| $82.2K | ﹤0.01% |
+751
| New | +$76.2K |
2026 Q2
0 quarters
|
|
5785
CALL
NexPoint Real Estate Finance
NREF
$290M
| $82.2K | ﹤0.01% |
+5,300
| New | +$78.8K |
2026 Q2
0 quarters
|
|
5786
PUT
Boot Barn
BOOT
$3.43B
| $82.1K | ﹤0.01% |
500
-2,200
| -81% | -$357K |
2018 Q1
33 quarters
|
|
5787
CALL
Calix
CALX
$2.4B
| $82.1K | ﹤0.01% |
+2,200
| New | +$92.3K |
2026 Q2
0 quarters
|
|
5788
PUT
GoodRx Holdings
GDRX
$1.18B
| $82.1K | ﹤0.01% |
28,500
-39,700
| -58% | -$101K |
2020 Q3
23 quarters
|
|
5789
CALL
Organigram Holdings
OGI
$138M
| $82K | ﹤0.01% |
80,400
-11,800
| -13% | -$14.4K |
2024 Q1
9 quarters
|
|
|
BTF
5790
PUT
DELISTED
CoinShares Bitcoin and Ether ETF
BTF
| $82K | ﹤0.01% |
1,300
-13,200
| -91% | -$256K |
2026 Q1
1 quarter
|
|
5791
CALL
DeFi Development Corp
DFDV
$130M
| $81.8K | ﹤0.01% |
50,700
-6,600
| -12% | -$25.3K |
2025 Q2
4 quarters
|
|
5792
CALL
News Corp Class B
NWS
$17.2B
| $81.7K | ﹤0.01% |
3,200
+400
| +14% | +$11.9K |
2019 Q2
28 quarters
|
|
5793
ACRES Commercial Realty
ACR
$196M
| $81.7K | ﹤0.01% |
4,592
+2,637
| +135% | +$51.6K |
2026 Q1
1 quarter
|
|
5794
CALL
Barnes & Noble Education
BNED
$448M
| $81.6K | ﹤0.01% |
6,500
-8,300
| -56% | -$86.7K |
2024 Q4
6 quarters
|
|
5795
PUT
Flowserve
FLS
$9.13B
| $81.6K | ﹤0.01% |
1,100
-2,300
| -68% | -$175K |
2025 Q4
2 quarters
|
|
5796
PUT
Immix Biopharma
IMMX
$674M
| $81.4K | ﹤0.01% |
7,900
-4,700
| -37% | -$43.6K |
2025 Q4
2 quarters
|
|
5797
PUT
Arcutis Biotherapeutics
ARQT
$3.95B
| $81.3K | ﹤0.01% |
3,100
-1,100
| -26% | -$25.6K |
2023 Q1
13 quarters
|
|
5798
PUT
Entravision Communication
EVC
$565M
| $80.8K | ﹤0.01% |
6,200
+3,700
| +148% | +$26.2K |
2026 Q1
1 quarter
|
|
5799
PUT
C4 Therapeutics
CCCC
$418M
| $80.8K | ﹤0.01% |
+17,300
| New | +$59.2K |
2026 Q2
0 quarters
|
|
5800
Unisys
UIS
$197M
| $80.7K | ﹤0.01% |
+22,042
| New | +$69.1K |
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.