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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 | |
|---|---|---|---|---|---|---|---|
3951
PUT
Xunlei
XNET
$223M
| $362K | ﹤0.01% |
75,000
+400
| +0.5% | +$2.09K |
2024 Q2
9 quarters
|
|
3952
PUT
BillionToOne Inc
BLLN
$5.06B
| $362K | ﹤0.01% |
3,400
+1,300
| +62% | +$146K |
2026 Q2
1 quarter
|
|
3953
CALL
Quantum-Si Incorporated
QSI
$257M
| $361K | ﹤0.01% |
337,800
-4,700
| -1% | -$3.77K |
2021 Q1
22 quarters
|
|
3954
Public Service Enterprise Group
PEG
$37.6B
| $361K | ﹤0.01% |
+5,366
| New | +$403K |
2026 Q3
0 quarters
|
|
3955
Trekor Metals
TGB
$2.5B
| $361K | ﹤0.01% |
40,481
-2,374
| -6% | -$19.2K |
2025 Q3
4 quarters
|
|
3956
CALL
Hamilton Insurance Group
HG
$3.82B
| $360K | ﹤0.01% |
10,900
+8,400
| +336% | +$293K |
2026 Q1
2 quarters
|
|
3957
PUT
Amplitude
AMPL
$2.21B
| $360K | ﹤0.01% |
26,000
+23,800
| +1,082% | +$275K |
2021 Q4
19 quarters
|
|
3958
NCR Voyix
VYX
$1.41B
| $360K | ﹤0.01% |
52,611
-63,241
| -55% | -$510K |
2025 Q1
6 quarters
|
|
3959
Valley National Bancorp
VLY
$7.95B
| $360K | ﹤0.01% |
+28,504
| New | +$404K |
2026 Q3
0 quarters
|
|
3960
CALL
Amplify Energy
AMPY
$158M
| $360K | ﹤0.01% |
85,400
+84,200
| +7,017% | +$367K |
2020 Q4
23 quarters
|
|
3961
CALL
Funko
FNKO
$383M
| $359K | ﹤0.01% |
66,400
+7,700
| +13% | +$44.8K |
2018 Q2
33 quarters
|
|
3962
CALL
Bitwise XRP ETF
XRP
$229M
| $359K | ﹤0.01% |
21,600
+20,400
| +1,700% | +$281K |
2026 Q2
1 quarter
|
|
3963
CALL
Adecoagro
AGRO
$1.3B
| $359K | ﹤0.01% |
35,400
-16,600
| -32% | -$175K |
2025 Q4
3 quarters
|
|
3964
PUT
Assured Guaranty
AGO
$3.24B
| $359K | ﹤0.01% |
5,300
+4,600
| +657% | +$357K |
2025 Q3
4 quarters
|
|
3965
PUT
Invesco
IVZ
$12.5B
| $359K | ﹤0.01% |
11,900
-6,800
| -36% | -$209K |
2016 Q1
42 quarters
|
|
3966
CALL
VivoPower PLC
VIVO
$71M
| $358K | ﹤0.01% |
97,100
+35,200
| +57% | +$145K |
2025 Q3
4 quarters
|
|
3967
Canadian Imperial Bank of Commerce
CM
$105B
| $358K | ﹤0.01% |
+3,250
| New | +$379K |
2026 Q3
0 quarters
|
|
3968
Dakota Gold
DC
$711M
| $358K | ﹤0.01% |
58,788
-2,899
| -5% | -$16K |
2026 Q1
2 quarters
|
|
3969
PUT
Gran Tierra Energy
GTE
$326M
| $358K | ﹤0.01% |
36,300
+28,400
| +359% | +$247K |
2025 Q4
3 quarters
|
|
3970
CALL
Brookdale Senior Living
BKD
$2.17B
| $357K | ﹤0.01% |
33,000
+12,800
| +63% | +$168K |
2018 Q1
34 quarters
|
|
3971
Centerra Gold
CGAU
$3.95B
| $357K | ﹤0.01% |
16,395
+14,503
| +767% | +$292K |
2024 Q4
7 quarters
|
|
3972
CALL
Corvus Pharmaceuticals
CRVS
$890M
| $356K | ﹤0.01% |
30,900
-4,600
| -13% | -$64.1K |
2023 Q2
13 quarters
|
|
3973
iShares MSCI ACWI ex US ETF
ACWX
$17.8B
| $355K | ﹤0.01% |
4,697
+213
| +5% | +$16.3K |
2026 Q2
1 quarter
|
|
3974
PUT
Kinsale Capital Group
KNSL
$9B
| $355K | ﹤0.01% |
1,100
-500
| -31% | -$180K |
2020 Q3
24 quarters
|
|
3975
PUT
Brandywine Realty Trust
BDN
$517M
| $354K | ﹤0.01% |
126,400
+1,700
| +1% | +$5.2K |
2020 Q2
25 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.