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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
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
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
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
3,485
Closed
1,488
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 | |
|---|---|---|---|---|---|---|---|
26
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.41B
| $963M | 0.56% |
12,991,800
-2,383,900
| -16% | -$122M |
2015 Q1
45 quarters
|
|
27
PUT
Microsoft
MSFT
$3.89T
| $905M | 0.53% |
2,425,900
+59,700
| +3% | +$24.2M |
2014 Q4
46 quarters
|
|
|
28
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.41B
| $883M | 0.52% |
12,448,000
-532,200
| -4% | -$27.3M |
2015 Q1
45 quarters
|
|
|
29
PUT
Amazon
AMZN
$2.88T
| $831M | 0.49% |
3,486,200
-902,500
| -21% | -$227M |
2015 Q1
45 quarters
|
|
30
CALL
VanEck Gold Miners ETF
GDX
$25.2B
| $805M | 0.47% |
3,268,100
+557,400
| +21% | +$49.2M |
2014 Q4
46 quarters
|
|
31
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $785M | 0.46% |
1,503,000
+35,000
| +2% | +$17.5M |
2015 Q1
45 quarters
|
|
32
PUT
Broadcom
AVGO
$1.66T
| $754M | 0.44% |
1,997,300
-99,800
| -5% | -$40M |
2021 Q2
20 quarters
|
|
33
PUT
Intel
INTC
$317B
| $745M | 0.44% |
5,334,900
+1,200,600
| +29% | +$121M |
2014 Q4
46 quarters
|
|
34
PUT
SPDR Gold Trust
GLD
$130B
| $740M | 0.43% |
2,008,600
-1,822,300
| -48% | -$755M |
2015 Q1
45 quarters
|
|
|
35
CALL
Intel
INTC
$317B
| $724M | 0.42% |
5,185,300
-1,712,700
| -25% | -$173M |
2014 Q4
46 quarters
|
|
|
36
CALL
Broadcom
AVGO
$1.66T
| $695M | 0.41% |
1,841,100
+161,600
| +10% | +$64.8M |
2021 Q2
20 quarters
|
|
|
37
PUT
TSMC
TSM
$2.07T
| $630M | 0.37% |
1,320,000
-155,000
| -11% | -$62.9M |
2026 Q1
1 quarter
|
|
38
CALL
Sandisk
SNDK
$126B
| $588M | 0.34% |
258,700
-3,800
| -1% | -$5.42M |
2025 Q1
5 quarters
|
|
39
CALL
iShares Silver Trust
SLV
$23.8B
| $584M | 0.34% |
10,916,100
-9,074,000
| -45% | -$602M |
2021 Q2
20 quarters
|
|
40
PUT
Palantir
PLTR
$405B
| $547M | 0.32% |
4,692,000
-159,200
| -3% | -$21.7M |
2021 Q2
20 quarters
|
|
41
CALL
Netflix
NFLX
$255B
| $530M | 0.31% |
7,425,500
+12,100
| +0.2% | +$1.07M |
2014 Q4
46 quarters
|
|
42
CALL
UnitedHealth
UNH
$365B
| $508M | 0.3% |
1,223,100
-695,900
| -36% | -$258M |
2021 Q2
20 quarters
|
|
|
43
PUT
Netflix
NFLX
$255B
| $474M | 0.28% |
6,642,600
-926,200
| -12% | -$81.6M |
2014 Q4
46 quarters
|
|
|
44
CALL
Palantir
PLTR
$405B
| $423M | 0.25% |
3,628,900
-356,600
| -9% | -$48.6M |
2021 Q2
20 quarters
|
|
45
CALL
iShares Bitcoin Trust
IBIT
$55.2B
| $415M | 0.24% |
12,461,100
-698,600
| -5% | -$28.4M |
2024 Q4
6 quarters
|
|
|
46
PUT
UnitedHealth
UNH
$365B
| $406M | 0.24% |
976,200
-184,400
| -16% | -$68.3M |
2021 Q2
20 quarters
|
|
47
CALL
SpaceX
SPCX
$1.89T
| $401M | 0.24% |
+2,348,600
| New | +$399M |
2026 Q2
0 quarters
|
|
48
PUT
Marvell Technology
MRVL
$141B
| $395M | 0.23% |
1,326,300
+332,200
| +33% | +$66.6M |
2021 Q2
20 quarters
|
|
49
PUT
Oracle
ORCL
$391B
| $384M | 0.23% |
2,619,100
+14,200
| +0.5% | +$2.57M |
2014 Q4
46 quarters
|
|
50
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$4.09B
| $383M | 0.22% |
1,621,800
-915,800
| -36% | -$165M |
2014 Q4
46 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, 3,485 reduced and 1,488 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 1,488 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.