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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 | |
|---|---|---|---|---|---|---|---|
3926
iShares Russell 2000 Value ETF
IWN
$13.9B
| $371K | ﹤0.01% |
+1,772
| New | +$392K |
2026 Q3
0 quarters
|
|
3927
ProShares Ultra QQQ
QLD
$12B
| $371K | ﹤0.01% |
+3,880
| New | +$350K |
2026 Q3
0 quarters
|
|
3928
CALL
RLJ Lodging Trust
RLJ
$1.98B
| $370K | ﹤0.01% |
33,500
-100
| -0.3% | -$1.14K |
2025 Q3
4 quarters
|
|
3929
CALL
Ingram Micro Holding
INGM
$6.49B
| $370K | ﹤0.01% |
13,800
+12,400
| +886% | +$348K |
2025 Q4
3 quarters
|
|
3930
CALL
Columbus McKinnon
CMCO
$593M
| $370K | ﹤0.01% |
23,200
-300
| -1% | -$5.06K |
2026 Q1
2 quarters
|
|
3931
CALL
Henry Schein
HSIC
$9.5B
| $369K | ﹤0.01% |
4,400
-4,000
| -48% | -$349K |
2015 Q4
43 quarters
|
|
3932
PUT
Central Puerto
CEPU
$1.57B
| $369K | ﹤0.01% |
30,500
+9,500
| +45% | +$133K |
2026 Q2
1 quarter
|
|
3933
CALL
Canary XRP ETF
XRPC
$233M
| $369K | ﹤0.01% |
23,400
-8,700
| -27% | -$114K |
2025 Q4
3 quarters
|
|
3934
First Citizens BancShares
FCNCA
$25.6B
| $369K | ﹤0.01% |
+179
| New | +$385K |
2026 Q3
0 quarters
|
|
3935
CALL
Alkermes
ALKS
$7.87B
| $369K | ﹤0.01% |
9,100
+1,000
| +12% | +$48.6K |
2021 Q2
21 quarters
|
|
3936
Winnebago Industries
WGO
$889M
| $368K | ﹤0.01% |
+13,965
| New | +$420K |
2026 Q3
0 quarters
|
|
3937
CALL
Omnicom Group
OMC
$24.1B
| $368K | ﹤0.01% |
5,000
-5,000
| -50% | -$408K |
2018 Q1
34 quarters
|
|
3938
PUT
Consolidated Edison
ED
$45B
| $368K | ﹤0.01% |
3,600
+2,100
| +140% | +$228K |
2014 Q4
47 quarters
|
|
3939
PUT
LPL Financial
LPLA
$22.5B
| $367K | ﹤0.01% |
1,200
+200
| +20% | +$68K |
2016 Q4
39 quarters
|
|
3940
CALL
Momentus
MNTS
$38.4M
| $367K | ﹤0.01% |
94,800
+91,100
| +2,462% | +$422K |
2026 Q2
1 quarter
|
|
3941
La-Z-Boy
LZB
$1.31B
| $366K | ﹤0.01% |
+12,365
| New | +$446K |
2026 Q3
0 quarters
|
|
3942
Grindr
GRND
$2.55B
| $366K | ﹤0.01% |
23,737
+5,191
| +28% | +$82.2K |
2025 Q4
3 quarters
|
|
3943
PUT
Horizon Quantum Holdings
HQ
$641M
| $366K | ﹤0.01% |
+24,600
| New | +$408K |
2026 Q3
0 quarters
|
|
3944
PUT
Axogen
AXGN
$3.39B
| $365K | ﹤0.01% |
+8,700
| New | +$391K |
2026 Q3
0 quarters
|
|
3945
PUT
Aclaris Therapeutics
ACRS
$609M
| $365K | ﹤0.01% |
69,300
+4,100
| +6% | +$23.4K |
2026 Q1
2 quarters
|
|
3946
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$60.1M
| $365K | ﹤0.01% |
9,138
-31
| -0.3% | -$1.44K |
2026 Q1
2 quarters
|
|
3947
PUT
InMode
INMD
$754M
| $364K | ﹤0.01% |
25,700
-5,300
| -17% | -$79.1K |
2020 Q1
26 quarters
|
|
3948
CALL
Organon & Co
OGN
$3.65B
| $363K | ﹤0.01% |
26,500
-22,900
| -46% | -$312K |
2021 Q2
21 quarters
|
|
3949
Levi Strauss
LEVI
$9.32B
| $363K | ﹤0.01% |
18,413
-27,187
| -60% | -$609K |
2026 Q1
2 quarters
|
|
3950
PUT
American Water Works
AWK
$29.9B
| $363K | ﹤0.01% |
2,800
-1,500
| -35% | -$203K |
2018 Q1
34 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.