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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 | |
|---|---|---|---|---|---|---|---|
1951
PUT
Powell Industries
POWL
$5.32B
| $2.07M | ﹤0.01% |
11,200
-14,900
| -57% | -$3.06M |
2023 Q4
11 quarters
|
|
1952
CALL
Axsome Therapeutics
AXSM
$7.85B
| $2.07M | ﹤0.01% |
11,200
-1,100
| -9% | -$239K |
2021 Q1
22 quarters
|
|
1953
CALL
SM Energy
SM
$7.32B
| $2.06M | ﹤0.01% |
61,100
+1,900
| +3% | +$63.6K |
2021 Q2
21 quarters
|
|
1954
Grocery Outlet
GO
$1.3B
| $2.06M | ﹤0.01% |
183,321
+20,870
| +13% | +$223K |
2026 Q2
1 quarter
|
|
1955
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.83B
| $2.06M | ﹤0.01% |
63,800
-98,200
| -61% | -$2.99M |
2015 Q1
46 quarters
|
|
1956
CALL
Viking Holdings
VIK
$40.2B
| $2.06M | ﹤0.01% |
26,300
+19,200
| +270% | +$1.81M |
2024 Q2
9 quarters
|
|
1957
CALL
Baldwin Insurance Group
BWIN
$4.51B
| $2.06M | ﹤0.01% |
64,700
+60,800
| +1,559% | +$1.79M |
2026 Q1
2 quarters
|
|
1958
PUT
Wingstop
WING
$4.51B
| $2.05M | ﹤0.01% |
19,500
+2,300
| +13% | +$285K |
2021 Q2
21 quarters
|
|
1959
CALL
CRISPR Therapeutics
CRSP
$4.44B
| $2.05M | ﹤0.01% |
37,100
-1,700
| -4% | -$91.7K |
2017 Q4
35 quarters
|
|
1960
CALL
Twenty One Capital Inc
XXI
$1.82B
| $2.05M | ﹤0.01% |
315,600
+30,700
| +11% | +$168K |
2025 Q4
3 quarters
|
|
1961
PUT
Enbridge
ENB
$107B
| $2.05M | ﹤0.01% |
44,100
-37,200
| -46% | -$1.92M |
2019 Q1
30 quarters
|
|
1962
Birkenstock
BIRK
$6.05B
| $2.05M | ﹤0.01% |
63,203
+51,099
| +422% | +$1.92M |
2024 Q4
7 quarters
|
|
1963
CALL
Via Transportation Inc
VIA
$3.49B
| $2.05M | ﹤0.01% |
67,700
+50,900
| +303% | +$1.22M |
2026 Q2
1 quarter
|
|
1964
CALL
F5
FFIV
$18.2B
| $2.05M | ﹤0.01% |
4,600
+3,200
| +229% | +$1.32M |
2014 Q4
47 quarters
|
|
|
TYNS
1965
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $2.05M | ﹤0.01% |
14,600
-8,100
| -36% | -$1.14M |
2014 Q4
47 quarters
|
|
1966
CALL
Argan
AGX
$4.52B
| $2.04M | ﹤0.01% |
5,400
+3,800
| +238% | +$1.95M |
2023 Q1
14 quarters
|
|
1967
Permian Resources
PR
$18.7B
| $2.04M | ﹤0.01% |
96,517
+95,232
| +7,411% | +$2.05M |
2026 Q1
2 quarters
|
|
1968
PUT
Diageo
DEO
$55.8B
| $2.04M | ﹤0.01% |
23,800
+16,600
| +231% | +$1.46M |
2014 Q4
47 quarters
|
|
1969
Expand Energy Corp
EXE
$20.5B
| $2.03M | ﹤0.01% |
24,199
+14,034
| +138% | +$1.29M |
2026 Q2
1 quarter
|
|
1970
CALL
Goldman Sachs Physical Gold ETF Shares
AAAU
$2.42B
| $2.03M | ﹤0.01% |
49,600
+41,600
| +520% | +$1.75M |
2025 Q1
6 quarters
|
|
1971
CALL
Achieve Life Sciences
ACHV
| $2.03M | ﹤0.01% |
251,000
-27,300
| -10% | -$195K |
2025 Q2
5 quarters
|
|
1972
CALL
Tidewater
TDW
$3.93B
| $2.03M | ﹤0.01% |
25,000
-5,100
| -17% | -$429K |
2022 Q1
18 quarters
|
|
1973
CALL
Universal Health Services
UHS
$11.3B
| $2.02M | ﹤0.01% |
11,600
+10,500
| +955% | +$1.76M |
2016 Q1
42 quarters
|
|
1974
PUT
Samsara
IOT
$24.7B
| $2.02M | ﹤0.01% |
53,000
+16,800
| +46% | +$644K |
2021 Q4
19 quarters
|
|
1975
CALL
Huntington Bancshares
HBAN
$32B
| $2.01M | ﹤0.01% |
132,000
-12,600
| -9% | -$215K |
2015 Q4
43 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.