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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 | |
|---|---|---|---|---|---|---|---|
4376
PUT
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.43B
| $251K | ﹤0.01% |
3,400
-5,600
| -62% | -$280K |
2019 Q2
29 quarters
|
|
4377
EOG Resources
EOG
$81.5B
| $251K | ﹤0.01% |
1,821
+427
| +31% | +$60.9K |
2025 Q4
3 quarters
|
|
4378
CALL
Baozun
BZUN
$203M
| $251K | ﹤0.01% |
81,900
+800
| +1% | +$2.26K |
2017 Q1
38 quarters
|
|
4379
CALL
Frontier Group Holdings
ULCC
$1.76B
| $250K | ﹤0.01% |
41,900
+4,400
| +12% | +$28K |
2021 Q2
21 quarters
|
|
4380
PUT
Repligen
RGEN
$10.6B
| $250K | ﹤0.01% |
1,300
-3,300
| -72% | -$537K |
2021 Q2
21 quarters
|
|
4381
CALL
Lloyds Banking Group
LYG
$73.8B
| $249K | ﹤0.01% |
44,300
-6,200
| -12% | -$37.1K |
2025 Q2
5 quarters
|
|
4382
Energy Fuels
UUUU
$1.73B
| $249K | ﹤0.01% |
22,604
-155,014
| -87% | -$2.04M |
2020 Q2
25 quarters
|
|
4383
CALL
Franklin XRP ETF
XRPZ
$159M
| $249K | ﹤0.01% |
+15,400
| New | +$206K |
2026 Q3
0 quarters
|
|
4384
eToro Group
ETOR
$1.77B
| $249K | ﹤0.01% |
+9,695
| New | +$319K |
2026 Q3
0 quarters
|
|
4385
IES Holdings
IESC
$7.21B
| $249K | ﹤0.01% |
776
-862
| -53% | -$285K |
2026 Q2
1 quarter
|
|
4386
CALL
Mercury Systems
MRCY
$4.94B
| $249K | ﹤0.01% |
+3,000
| New | +$290K |
2026 Q3
0 quarters
|
|
4387
CALL
Dingdong
DDL
$387M
| $249K | ﹤0.01% |
116,900
+65,000
| +125% | +$147K |
2024 Q4
7 quarters
|
|
4388
PUT
US Foods
USFD
$23.4B
| $249K | ﹤0.01% |
2,700
+2,600
| +2,600% | +$263K |
2018 Q2
33 quarters
|
|
4389
CALL
Alignment Healthcare
ALHC
$1.52B
| $249K | ﹤0.01% |
30,500
-17,300
| -36% | -$258K |
2022 Q4
15 quarters
|
|
4390
PUT
Popular Inc
BPOP
$9.8B
| $249K | ﹤0.01% |
+1,600
| New | +$271K |
2026 Q3
0 quarters
|
|
4391
CALL
Brookfield Renewable
BEPC
$5.68B
| $248K | ﹤0.01% |
8,800
-21,600
| -71% | -$707K |
2020 Q3
24 quarters
|
|
4392
ProShares UltraShort Silver
ZSL
$67.4M
| $248K | ﹤0.01% |
8,973
-6,906
| -43% | -$185K |
2025 Q4
3 quarters
|
|
4393
CALL
Tron Inc
TRON
$669M
| $248K | ﹤0.01% |
174,700
-79,100
| -31% | -$124K |
2025 Q2
5 quarters
|
|
4394
CALL
DELISTED
Apollo Commercial Real Estate
ARI
| $247K | ﹤0.01% |
39,900
+3,900
| +11% | +$28.3K |
2026 Q1
2 quarters
|
|
4395
CALL
Everforth Inc
EFOR
$1.46B
| $247K | ﹤0.01% |
7,500
-7,500
| -50% | -$209K |
2026 Q1
2 quarters
|
|
4396
Colgate-Palmolive
CL
$79.2B
| $247K | ﹤0.01% |
2,891
-14,828
| -84% | -$1.34M |
2026 Q2
1 quarter
|
|
4397
Root
ROOT
$659M
| $247K | ﹤0.01% |
+5,348
| New | +$296K |
2026 Q3
0 quarters
|
|
4398
CALL
Trilogy Metals
TMQ
$350M
| $246K | ﹤0.01% |
79,400
+18,000
| +29% | +$60.7K |
2025 Q3
4 quarters
|
|
4399
CALL
4D Molecular Therapeutics
FDMT
$676M
| $246K | ﹤0.01% |
17,200
+2,100
| +14% | +$27.3K |
2026 Q1
2 quarters
|
|
4400
CALL
Spire Global
SPIR
$355M
| $246K | ﹤0.01% |
22,000
-39,200
| -64% | -$510K |
2021 Q4
19 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.