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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 | |
|---|---|---|---|---|---|---|---|
3601
Chimera Investment
CIM
$546M
| $486K | ﹤0.01% |
+50,958
| New | +$605K |
2026 Q3
0 quarters
|
|
3602
CALL
Allegiant Air
ALGT
$2.54B
| $485K | ﹤0.01% |
6,400
+5,000
| +357% | +$450K |
2017 Q4
35 quarters
|
|
3603
A10 Networks
ATEN
$2.07B
| $484K | ﹤0.01% |
17,856
-23,816
| -57% | -$700K |
2025 Q4
3 quarters
|
|
3604
Atlas Energy Solutions
AESI
$656M
| $484K | ﹤0.01% |
40,275
+22,478
| +126% | +$288K |
2026 Q2
1 quarter
|
|
3605
CALL
Host Hotels & Resorts
HST
$17.5B
| $484K | ﹤0.01% |
21,600
-3,000
| -12% | -$69.3K |
2017 Q4
35 quarters
|
|
3606
CALL
Grindr
GRND
$2.55B
| $483K | ﹤0.01% |
31,300
+9,800
| +46% | +$155K |
2023 Q3
12 quarters
|
|
3607
Scholastic
SCHL
$674M
| $482K | ﹤0.01% |
+13,708
| New | +$555K |
2026 Q3
0 quarters
|
|
3608
PUT
Advanced Drainage Systems
WMS
$9.27B
| $481K | ﹤0.01% |
+3,800
| New | +$531K |
2026 Q3
0 quarters
|
|
3609
CALL
Group 1 Automotive
GPI
$3.08B
| $481K | ﹤0.01% |
2,000
| – | – |
2019 Q2
29 quarters
|
|
3610
INNIO N.V.
INIO
$10.7B
| $481K | ﹤0.01% |
26,518
+25,919
| +4,327% | +$646K |
2026 Q2
1 quarter
|
|
3611
Borr Drilling
BORR
$1.04B
| $480K | ﹤0.01% |
123,512
+47,590
| +63% | +$204K |
2026 Q1
2 quarters
|
|
3612
Global X Genomics & Biotechnology ETF
GNOM
$99.3M
| $480K | ﹤0.01% |
6,812
+3,335
| +96% | +$204K |
2026 Q2
1 quarter
|
|
3613
PUT
Mineralys Therapeutics
MLYS
$1.33B
| $480K | ﹤0.01% |
19,100
-19,800
| -51% | -$539K |
2025 Q3
4 quarters
|
|
3614
WEX
WEX
$5.93B
| $480K | ﹤0.01% |
2,844
+445
| +19% | +$80.7K |
2026 Q2
1 quarter
|
|
3615
PUT
Gemini Space Station
GEMI
$335M
| $479K | ﹤0.01% |
92,800
-10,400
| -10% | -$46.6K |
2025 Q3
4 quarters
|
|
3616
CALL
Owens Corning
OC
$9B
| $479K | ﹤0.01% |
4,100
+3,100
| +310% | +$433K |
2014 Q4
47 quarters
|
|
3617
Willis Towers Watson
WTW
$31.2B
| $478K | ﹤0.01% |
+1,660
| New | +$525K |
2026 Q3
0 quarters
|
|
3618
CALL
Porch Group
PRCH
$2.41B
| $478K | ﹤0.01% |
28,700
+19,100
| +199% | +$299K |
2021 Q1
22 quarters
|
|
3619
PUT
Asana
ASAN
$2.24B
| $478K | ﹤0.01% |
56,700
+5,400
| +11% | +$46.8K |
2020 Q4
23 quarters
|
|
3620
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.35B
| $477K | ﹤0.01% |
35,100
+1,500
| +4% | +$21.7K |
2026 Q1
2 quarters
|
|
3621
PUT
Genworth Financial
GNW
$3.06B
| $477K | ﹤0.01% |
53,200
-3,800
| -7% | -$37.5K |
2021 Q1
22 quarters
|
|
3622
Monro
MNRO
$325M
| $476K | ﹤0.01% |
+34,059
| New | +$476K |
2026 Q3
0 quarters
|
|
3623
Flutter Entertainment
FLUT
$14.4B
| $476K | ﹤0.01% |
6,383
+3,991
| +167% | +$396K |
2026 Q2
1 quarter
|
|
3624
Global X US Infrastructure Development ETF
PAVE
$13.5B
| $476K | ﹤0.01% |
9,060
-1,844
| -17% | -$103K |
2026 Q2
1 quarter
|
|
3625
CALL
Edgewise Therapeutics
EWTX
$4.85B
| $475K | ﹤0.01% |
11,700
+10,400
| +800% | +$442K |
2023 Q4
11 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.