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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 | |
|---|---|---|---|---|---|---|---|
5051
CALL
AIRO Group Holdings
AIRO
$178M
| $139K | ﹤0.01% |
21,000
-7,000
| -25% | -$52K |
2025 Q3
4 quarters
|
|
5052
PUT
Adaptive Biotechnologies
ADPT
$4.77B
| $139K | ﹤0.01% |
4,800
+3,800
| +380% | +$93.3K |
2026 Q1
2 quarters
|
|
|
5053
AIRO Group Holdings
AIRO
$178M
| $139K | ﹤0.01% |
20,978
-3,097
| -13% | -$23K |
2025 Q3
4 quarters
|
|
5054
PUT
Yext
YEXT
$759M
| $138K | ﹤0.01% |
21,400
+20,700
| +2,957% | +$122K |
2025 Q1
6 quarters
|
|
5055
Draganfly
DPRO
$113M
| $138K | ﹤0.01% |
+22,750
| New | +$112K |
2026 Q3
0 quarters
|
|
5056
PUT
Angi Inc
ANGI
$259M
| $138K | ﹤0.01% |
24,000
-17,400
| -42% | -$93.2K |
2024 Q1
10 quarters
|
|
5057
YieldMax COIN Option Income Strategy ETF
CONY
$268M
| $138K | ﹤0.01% |
6,888
+5,569
| +422% | +$110K |
2025 Q2
5 quarters
|
|
5058
NexPoint Residential Trust
NXRT
$396M
| $138K | ﹤0.01% |
7,078
+6,792
| +2,375% | +$166K |
2025 Q3
4 quarters
|
|
5059
Companhia Siderúrgica Nacional
SID
$834M
| $138K | ﹤0.01% |
+130,131
| New | +$136K |
2026 Q3
0 quarters
|
|
5060
CALL
RadNet
RDNT
$6.02B
| $138K | ﹤0.01% |
2,000
+1,700
| +567% | +$120K |
2025 Q3
4 quarters
|
|
5061
CALL
Genesis Energy
GEL
$1.55B
| $138K | ﹤0.01% |
10,000
-6,500
| -39% | -$99K |
2018 Q2
33 quarters
|
|
5062
iShares U.S. Power Infrastructure ETF
POWR
$444M
| $138K | ﹤0.01% |
5,688
+1,659
| +41% | +$43.2K |
2026 Q2
1 quarter
|
|
5063
PUT
OppFi
OPFI
$503M
| $137K | ﹤0.01% |
22,800
-131,600
| -85% | -$1.06M |
2023 Q3
12 quarters
|
|
5064
MSC Industrial Direct
MSM
$6.67B
| $137K | ﹤0.01% |
1,111
-3,295
| -75% | -$402K |
2025 Q4
3 quarters
|
|
5065
PUT
Box
BOX
$5.99B
| $137K | ﹤0.01% |
4,100
+2,000
| +95% | +$64.4K |
2016 Q1
42 quarters
|
|
5066
CALL
Worthington Enterprises
WOR
$2.93B
| $137K | ﹤0.01% |
2,300
+2,100
| +1,050% | +$120K |
2025 Q2
5 quarters
|
|
5067
CALL
Alpha Architect US Quantitative Value ETF
QVAL
$730M
| $137K | ﹤0.01% |
2,000
+1,300
| +186% | +$77.3K |
2026 Q1
2 quarters
|
|
5068
PUT
Williams-Sonoma
WSM
$29.9B
| $137K | ﹤0.01% |
600
-400
| -40% | -$92.4K |
2021 Q2
21 quarters
|
|
5069
Brookfield Infrastructure Partners
BIP
$18B
| $137K | ﹤0.01% |
3,847
-935
| -20% | -$35.6K |
2025 Q3
4 quarters
|
|
5070
CALL
DELISTED
CBIZ
CBZ
| $137K | ﹤0.01% |
2,500
-800
| -24% | -$40.2K |
2025 Q3
4 quarters
|
|
5071
PUT
Sonoco
SON
$4.84B
| $137K | ﹤0.01% |
2,800
| – | – |
2019 Q3
28 quarters
|
|
5072
Arteris
AIP
$1B
| $137K | ﹤0.01% |
+5,778
| New | +$158K |
2026 Q3
0 quarters
|
|
5073
Slide Insurance Holdings
SLDE
$3.02B
| $137K | ﹤0.01% |
6,120
+2,987
| +95% | +$66.5K |
2026 Q1
2 quarters
|
|
5074
CALL
CareDx
CDNA
$4.19B
| $136K | ﹤0.01% |
+2,100
| New | +$95.2K |
2026 Q3
0 quarters
|
|
5075
Roundhill Generative AI & Technology ETF
CHAT
$1.5B
| $136K | ﹤0.01% |
1,484
-1,252
| -46% | -$110K |
2025 Q3
4 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.