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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 | |
|---|---|---|---|---|---|---|---|
1851
PUT
Viking Holdings
VIK
$40.2B
| $2.27M | ﹤0.01% |
29,000
-8,000
| -22% | -$752K |
2024 Q2
9 quarters
|
|
1852
PUT
Ultragenyx Pharmaceutical
RARE
$1.7B
| $2.27M | ﹤0.01% |
151,100
+118,100
| +358% | +$2.84M |
2026 Q1
2 quarters
|
|
1853
CALL
WillScot Mobile Mini Holdings
WSC
$3.66B
| $2.27M | ﹤0.01% |
132,100
+108,500
| +460% | +$2.46M |
2019 Q2
29 quarters
|
|
1854
PUT
BJs Wholesale Club
BJ
$14B
| $2.26M | ﹤0.01% |
24,600
+20,500
| +500% | +$1.9M |
2018 Q3
32 quarters
|
|
1855
PUT
Aurora
AUR
$9.29B
| $2.26M | ﹤0.01% |
408,100
-30,000
| -7% | -$189K |
2021 Q4
19 quarters
|
|
1856
PUT
T-REX 2X Long CRWV Daily Target ETF
CRWU
$11.3M
| $2.26M | ﹤0.01% |
+56,900
| New | +$2.15M |
2026 Q3
0 quarters
|
|
1857
Figma
FIG
$10.2B
| $2.26M | ﹤0.01% |
107,464
+8,489
| +9% | +$203K |
2025 Q4
3 quarters
|
|
1858
PUT
CRISPR Therapeutics
CRSP
$4.44B
| $2.26M | ﹤0.01% |
40,800
+4,600
| +13% | +$248K |
2017 Q3
36 quarters
|
|
1859
CALL
Zillow
Z
$6.65B
| $2.26M | ﹤0.01% |
83,100
-87,100
| -51% | -$2.87M |
2015 Q3
44 quarters
|
|
1860
CALL
Gorilla Technology Group
GRRR
$230M
| $2.26M | ﹤0.01% |
162,700
+62,200
| +62% | +$881K |
2026 Q1
2 quarters
|
|
1861
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.23B
| $2.25M | ﹤0.01% |
37,700
+23,400
| +164% | +$1.44M |
2020 Q3
24 quarters
|
|
1862
CALL
ACM Research
ACMR
$3.67B
| $2.25M | ﹤0.01% |
27,800
+17,300
| +165% | +$1.4M |
2020 Q1
26 quarters
|
|
1863
PUT
Amer Sports
AS
$18.1B
| $2.25M | ﹤0.01% |
82,400
-3,800
| -4% | -$122K |
2024 Q1
10 quarters
|
|
1864
ProShares Ultra Bloomberg Natural Gas
BOIL
$485M
| $2.25M | ﹤0.01% |
114,499
+114,329
| +67,252% | +$2.41M |
2025 Q1
6 quarters
|
|
1865
Comcast
CMCSA
$88.8B
| $2.25M | ﹤0.01% |
103,255
-266,773
| -72% | -$6.53M |
2025 Q3
4 quarters
|
|
1866
CALL
UP Fintech Holding
TIGR
$723M
| $2.25M | ﹤0.01% |
489,300
-256,000
| -34% | -$1.23M |
2020 Q3
24 quarters
|
|
1867
CALL
Precigen
PGEN
$1.69B
| $2.24M | ﹤0.01% |
261,900
+202,900
| +344% | +$1.33M |
2021 Q2
21 quarters
|
|
1868
CALL
Match Group
MTCH
$9.47B
| $2.24M | ﹤0.01% |
55,800
-20,100
| -26% | -$804K |
2021 Q2
21 quarters
|
|
1869
Golar LNG
GLNG
$4.37B
| $2.24M | ﹤0.01% |
47,117
+42,224
| +863% | +$2.14M |
2020 Q2
25 quarters
|
|
|
JPGE
1870
CALL
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $2.24M | ﹤0.01% |
39,900
+10,000
| +33% | +$561K |
2026 Q1
2 quarters
|
|
1871
iShares China Large-Cap ETF
FXI
$3.89B
| $2.24M | ﹤0.01% |
+65,758
| New | +$2.29M |
2026 Q3
0 quarters
|
|
1872
PUT
B2Gold
BTG
$6.82B
| $2.24M | ﹤0.01% |
428,400
+17,600
| +4% | +$83.7K |
2019 Q4
27 quarters
|
|
1873
CALL
Veralto
VLTO
$28.9B
| $2.24M | ﹤0.01% |
23,700
+100
| +0.4% | +$9.6K |
2023 Q4
11 quarters
|
|
1874
Elevance Health
ELV
$92.8B
| $2.23M | ﹤0.01% |
5,747
-2,661
| -32% | -$1.06M |
2026 Q2
1 quarter
|
|
1875
PUT
NexGen Energy
NXE
$5.58B
| $2.23M | ﹤0.01% |
244,800
+159,300
| +186% | +$1.56M |
2021 Q1
22 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.