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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 | |
|---|---|---|---|---|---|---|---|
1301
PUT
Jefferies Financial Group
JEF
$11B
| $4.23M | ﹤0.01% |
92,600
+56,300
| +155% | +$2.98M |
2018 Q2
33 quarters
|
|
1302
PUT
Mettler-Toledo International
MTD
$34.8B
| $4.23M | ﹤0.01% |
+2,800
| New | +$3.86M |
2026 Q3
0 quarters
|
|
1303
CALL
Transmedics
TMDX
$3.2B
| $4.21M | ﹤0.01% |
50,500
+7,000
| +16% | +$576K |
2021 Q1
22 quarters
|
|
1304
CALL
SentinelOne
S
$8.28B
| $4.21M | ﹤0.01% |
177,000
-160,600
| -48% | -$3.32M |
2021 Q4
19 quarters
|
|
1305
PUT
Hilton Worldwide Holdings Inc. Common Stock
HLT
$83.9B
| $4.2M | ﹤0.01% |
13,200
-600
| -4% | -$192K |
2014 Q4
47 quarters
|
|
1306
CALL
GSK
GSK
$101B
| $4.2M | ﹤0.01% |
87,100
-10,200
| -10% | -$521K |
2014 Q4
47 quarters
|
|
1307
PUT
Uranium Energy
UEC
$3.58B
| $4.19M | ﹤0.01% |
443,700
+241,300
| +119% | +$2.57M |
2020 Q2
25 quarters
|
|
1308
PUT
Transocean
RIG
$5.93B
| $4.19M | ﹤0.01% |
799,800
-134,200
| -14% | -$734K |
2021 Q2
21 quarters
|
|
1309
PUT
Howmet Aerospace
HWM
$89.1B
| $4.18M | ﹤0.01% |
18,500
+5,600
| +43% | +$1.47M |
2016 Q4
39 quarters
|
|
1310
PUT
Summit Therapeutics
SMMT
$13.3B
| $4.18M | ﹤0.01% |
247,400
+57,400
| +30% | +$859K |
2022 Q4
15 quarters
|
|
1311
PUT
Equinor
EQNR
$97.8B
| $4.18M | ﹤0.01% |
100,400
+2,400
| +2% | +$96.8K |
2018 Q2
33 quarters
|
|
1312
CALL
Viatris
VTRS
$24.1B
| $4.17M | ﹤0.01% |
235,600
+8,500
| +4% | +$144K |
2021 Q2
21 quarters
|
|
1313
PUT
SiTime
SITM
$14.3B
| $4.17M | ﹤0.01% |
6,400
| – | – |
2021 Q4
19 quarters
|
|
1314
CALL
Travelers Companies
TRV
$81.8B
| $4.17M | ﹤0.01% |
11,700
-20,000
| -63% | -$7.32M |
2014 Q4
47 quarters
|
|
1315
CALL
Alamos Gold
AGI
$12.6B
| $4.17M | ﹤0.01% |
128,700
-15,500
| -11% | -$511K |
2019 Q3
28 quarters
|
|
1316
CALL
Insmed
INSM
$26.5B
| $4.17M | ﹤0.01% |
36,500
-8,500
| -19% | -$1M |
2018 Q2
33 quarters
|
|
1317
iShares Ethereum Trust ETF
ETHA
$6.27B
| $4.16M | ﹤0.01% |
+68,969
| New | +$3.38M |
2026 Q3
0 quarters
|
|
1318
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $4.16M | ﹤0.01% |
51,200
+10,900
| +27% | +$288K |
2026 Q1
2 quarters
|
|
1319
CALL
Venture Global Inc
VG
$31.7B
| $4.16M | ﹤0.01% |
328,800
-13,900
| -4% | -$190K |
2025 Q1
6 quarters
|
|
1320
Dick's Sporting Goods
DKS
$14.7B
| $4.15M | ﹤0.01% |
30,885
+21,523
| +230% | +$3.79M |
2025 Q3
4 quarters
|
|
1321
CALL
FormFactor
FORM
$7.51B
| $4.14M | ﹤0.01% |
27,700
-7,200
| -21% | -$822K |
2018 Q4
31 quarters
|
|
1322
PUT
Symbotic
SYM
$4.82B
| $4.13M | ﹤0.01% |
98,200
+30,600
| +45% | +$1.29M |
2022 Q3
16 quarters
|
|
1323
PUT
Hubbell
HUBB
$23.4B
| $4.13M | ﹤0.01% |
9,100
+6,500
| +250% | +$3.09M |
2025 Q3
4 quarters
|
|
1324
CALL
Dycom Industries
DY
$6.88B
| $4.12M | ﹤0.01% |
15,300
+11,000
| +256% | +$4.01M |
2015 Q1
46 quarters
|
|
1325
PUT
Peabody Energy
BTU
$2.06B
| $4.11M | ﹤0.01% |
168,400
-33,000
| -16% | -$831K |
2017 Q2
37 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.