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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
-0.22%
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
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1751
Williams Companies
WMB
$86.2B
| $2.55M | ﹤0.01% |
37,477
+28,543
| +319% | +$2.08M |
2026 Q2
1 quarter
|
|
1752
US Global Jets ETF
JETS
$949M
| $2.55M | ﹤0.01% |
+90,243
| New | +$2.73M |
2026 Q3
0 quarters
|
|
1753
CALL
Hawaiian Electric Industries
HE
$1.54B
| $2.54M | ﹤0.01% |
284,500
+27,600
| +11% | +$325K |
2018 Q3
32 quarters
|
|
1754
PUT
Ormat Technologies
ORA
$5.73B
| $2.54M | ﹤0.01% |
27,800
-2,200
| -7% | -$227K |
2025 Q2
5 quarters
|
|
1755
CALL
Moody's
MCO
$88.8B
| $2.54M | ﹤0.01% |
5,600
-1,100
| -16% | -$534K |
2016 Q3
40 quarters
|
|
1756
CALL
Bitwise Bitcoin ETF
BITB
$2.76B
| $2.54M | ﹤0.01% |
56,000
-25,900
| -32% | -$1M |
2024 Q4
7 quarters
|
|
1757
iShares Russell Mid-Cap ETF
IWR
$58.9B
| $2.54M | ﹤0.01% |
+23,804
| New | +$2.63M |
2026 Q3
0 quarters
|
|
1758
CALL
Republic Services
RSG
$76B
| $2.54M | ﹤0.01% |
12,100
+2,400
| +25% | +$522K |
2015 Q3
44 quarters
|
|
1759
PUT
Zillow
Z
$6.65B
| $2.53M | ﹤0.01% |
92,500
-18,300
| -17% | -$603K |
2015 Q3
44 quarters
|
|
1760
CALL
Deckers Outdoor
DECK
$11.8B
| $2.53M | ﹤0.01% |
32,400
-6,600
| -17% | -$609K |
2014 Q4
47 quarters
|
|
1761
PUT
Invitation Homes
INVH
$15.5B
| $2.53M | ﹤0.01% |
96,100
-33,000
| -26% | -$962K |
2019 Q2
29 quarters
|
|
1762
PUT
Rockwell Automation
ROK
$45.1B
| $2.52M | ﹤0.01% |
5,800
-7,900
| -58% | -$3.51M |
2021 Q1
22 quarters
|
|
1763
CALL
Cintas
CTAS
$90.2B
| $2.52M | ﹤0.01% |
12,900
-14,700
| -53% | -$2.92M |
2016 Q2
41 quarters
|
|
1764
CleanSpark
CLSK
$1.77B
| $2.51M | ﹤0.01% |
195,106
+63,883
| +49% | +$837K |
2020 Q4
23 quarters
|
|
1765
Globalstar
GSAT
$11.2B
| $2.51M | ﹤0.01% |
30,237
-1,914
| -6% | -$156K |
2026 Q1
2 quarters
|
|
1766
CALL
Arch Capital
ACGL
$35.5B
| $2.5M | ﹤0.01% |
27,100
-1,200
| -4% | -$119K |
2019 Q2
29 quarters
|
|
1767
CALL
Nasdaq
NDAQ
$61.3B
| $2.5M | ﹤0.01% |
27,200
-3,400
| -11% | -$318K |
2021 Q2
21 quarters
|
|
1768
Berkshire Hathaway Class B
BRK.B
$1.25T
| $2.5M | ﹤0.01% |
+5,025
| New | +$2.54M |
2026 Q3
0 quarters
|
|
1769
PUT
Sunrun
RUN
$2.19B
| $2.5M | ﹤0.01% |
321,900
-106,200
| -25% | -$1.05M |
2021 Q1
22 quarters
|
|
1770
Erasca
ERAS
$5.88B
| $2.5M | ﹤0.01% |
170,583
-106,405
| -38% | -$1.86M |
2023 Q1
14 quarters
|
|
1771
CALL
Vail Resorts
MTN
$5.52B
| $2.5M | ﹤0.01% |
18,200
+1,100
| +6% | +$159K |
2015 Q3
44 quarters
|
|
1772
CALL
Agilon Health
AGL
$1.93B
| $2.49M | ﹤0.01% |
31,300
-2,600
| -8% | -$253K |
2021 Q2
21 quarters
|
|
1773
CALL
HIVE Digital Technologies
HIVE
$480M
| $2.49M | ﹤0.01% |
843,300
-23,200
| -3% | -$69.9K |
2026 Q1
2 quarters
|
|
1774
PUT
Oneok
OKE
$55.6B
| $2.48M | ﹤0.01% |
29,100
-6,900
| -19% | -$635K |
2014 Q4
47 quarters
|
|
1775
CALL
Digital Realty Trust
DLR
$68.5B
| $2.47M | ﹤0.01% |
14,100
-2,400
| -15% | -$445K |
2015 Q2
45 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.