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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 | |
|---|---|---|---|---|---|---|---|
1676
PUT
State Street Multi-Asset Real Return ETF
RLY
$1.39B
| $2.77M | ﹤0.01% |
68,700
+49,600
| +260% | +$1.82M |
2025 Q4
3 quarters
|
|
1677
CALL
SL Green Realty
SLG
$3.53B
| $2.77M | ﹤0.01% |
56,700
+13,100
| +30% | +$700K |
2019 Q3
28 quarters
|
|
1678
CALL
South Bow Corp
SOBO
$6.9B
| $2.77M | ﹤0.01% |
83,700
-23,200
| -22% | -$846K |
2025 Q1
6 quarters
|
|
1679
CALL
Vista Energy
VIST
$6.19B
| $2.77M | ﹤0.01% |
42,400
+3,200
| +8% | +$220K |
2021 Q4
19 quarters
|
|
1680
Dutch Bros
BROS
$4.83B
| $2.77M | ﹤0.01% |
71,783
+50,181
| +232% | +$2.7M |
2026 Q2
1 quarter
|
|
1681
CALL
New Era Energy & Digital Inc
NUAI
$273M
| $2.76M | ﹤0.01% |
410,800
+79,200
| +24% | +$422K |
2026 Q1
2 quarters
|
|
1682
CALL
Edwards Lifesciences
EW
$60.8B
| $2.74M | ﹤0.01% |
31,800
-10,300
| -24% | -$915K |
2021 Q1
22 quarters
|
|
1683
PUT
Icahn Enterprises
IEP
$3.78B
| $2.74M | ﹤0.01% |
406,300
-59,000
| -13% | -$426K |
2014 Q4
47 quarters
|
|
1684
Expedia Group
EXPE
$30.8B
| $2.74M | ﹤0.01% |
10,393
+4,872
| +88% | +$1.42M |
2026 Q2
1 quarter
|
|
1685
PUT
Ionis Pharmaceuticals
IONS
$4.71B
| $2.74M | ﹤0.01% |
61,300
-3,600
| -6% | -$205K |
2014 Q4
47 quarters
|
|
1686
PUT
Ralph Lauren
RL
$23.3B
| $2.73M | ﹤0.01% |
7,700
+200
| +3% | +$73.7K |
2014 Q4
47 quarters
|
|
1687
CALL
Capricor Therapeutics
CAPR
$652M
| $2.73M | ﹤0.01% |
288,000
+193,500
| +205% | +$2.14M |
2020 Q2
25 quarters
|
|
1688
Twist Bioscience
TWST
$8.13B
| $2.72M | ﹤0.01% |
14,092
+6,014
| +74% | +$743K |
2025 Q4
3 quarters
|
|
1689
CALL
Pagaya Technologies
PGY
$1.45B
| $2.72M | ﹤0.01% |
157,200
+3,500
| +2% | +$69.1K |
2022 Q3
16 quarters
|
|
1690
Destiny Tech100
DXYZ
$791M
| $2.72M | ﹤0.01% |
+88,222
| New | +$2.55M |
2026 Q3
0 quarters
|
|
1691
PUT
Shift4
FOUR
$3.44B
| $2.72M | ﹤0.01% |
75,200
-1,600
| -2% | -$73.8K |
2020 Q3
24 quarters
|
|
1692
PUT
ServiceTitan Inc
TTAN
$7.89B
| $2.72M | ﹤0.01% |
41,300
+27,000
| +189% | +$2.11M |
2025 Q1
6 quarters
|
|
1693
CALL
T1 Energy
TE
$638M
| $2.71M | ﹤0.01% |
703,200
+151,300
| +27% | +$780K |
2021 Q4
19 quarters
|
|
1694
CALL
Himax Technologies
HIMX
$1.59B
| $2.71M | ﹤0.01% |
192,500
-23,300
| -11% | -$323K |
2021 Q2
21 quarters
|
|
1695
CALL
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.42B
| $2.7M | ﹤0.01% |
126,600
-208,000
| -62% | -$4.23M |
2026 Q2
1 quarter
|
|
1696
CALL
Lithium Americas
LAC
$599M
| $2.7M | ﹤0.01% |
1,027,100
-96,400
| -9% | -$296K |
2023 Q4
11 quarters
|
|
1697
CALL
Boost Run Inc
BRUN
$587M
| $2.7M | ﹤0.01% |
163,600
+125,500
| +329% | +$2.57M |
2026 Q2
1 quarter
|
|
1698
PUT
Conagra Brands
CAG
$7.08B
| $2.7M | ﹤0.01% |
200,800
-40,700
| -17% | -$610K |
2021 Q1
22 quarters
|
|
1699
Teucrium Corn Fund
CORN
$106M
| $2.7M | ﹤0.01% |
+141,595
| New | +$2.65M |
2026 Q3
0 quarters
|
|
1700
PUT
Churchill Downs
CHDN
$6.9B
| $2.69M | ﹤0.01% |
35,600
+26,000
| +271% | +$2.23M |
2026 Q2
1 quarter
|
|
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.