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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 | |
|---|---|---|---|---|---|---|---|
3826
Capricor Therapeutics
CAPR
$550M
| $401K | ﹤0.01% |
+42,344
| New | +$469K |
2026 Q3
0 quarters
|
|
3827
GXO Logistics
GXO
$6.14B
| $401K | ﹤0.01% |
9,016
-11,650
| -56% | -$566K |
2025 Q1
6 quarters
|
|
3828
Vizsla Silver
VZLA
$1.09B
| $400K | ﹤0.01% |
105,587
+18,282
| +21% | +$66.6K |
2025 Q3
4 quarters
|
|
3829
Alumis Inc
ALMS
$726M
| $399K | ﹤0.01% |
54,055
+49,069
| +984% | +$1.02M |
2026 Q1
2 quarters
|
|
3830
Performance Food Group
PFGC
$17.4B
| $399K | ﹤0.01% |
+4,365
| New | +$457K |
2026 Q3
0 quarters
|
|
3831
CALL
Arcutis Biotherapeutics
ARQT
$3.51B
| $399K | ﹤0.01% |
15,100
-1,000
| -6% | -$26.2K |
2022 Q4
15 quarters
|
|
3832
PUT
Power Integrations
POWI
$2.45B
| $399K | ﹤0.01% |
7,700
-33,200
| -81% | -$1.97M |
2025 Q3
4 quarters
|
|
3833
Priority Technology Holdings
PRTH
$654M
| $399K | ﹤0.01% |
51,122
+41,953
| +458% | +$264K |
2026 Q1
2 quarters
|
|
3834
CALL
Life360
LIF
$3.61B
| $399K | ﹤0.01% |
9,900
+9,300
| +1,550% | +$455K |
2025 Q2
5 quarters
|
|
3835
CALL
Lantheus
LNTH
$6.64B
| $398K | ﹤0.01% |
4,000
-4,200
| -51% | -$428K |
2018 Q2
33 quarters
|
|
3836
Syndax Pharmaceuticals
SNDX
$845M
| $398K | ﹤0.01% |
21,168
+18,177
| +608% | +$367K |
2025 Q4
3 quarters
|
|
3837
iShares MSCI ACWI ETF
ACWI
$32.2B
| $398K | ﹤0.01% |
+2,505
| New | +$398K |
2026 Q3
0 quarters
|
|
3838
CALL
Magnachip Semiconductor
MX
$98.2M
| $397K | ﹤0.01% |
105,600
-150,800
| -59% | -$520K |
2026 Q1
2 quarters
|
|
3839
CALL
AAR Corp
AIR
$4.33B
| $396K | ﹤0.01% |
3,900
+2,700
| +225% | +$357K |
2025 Q3
4 quarters
|
|
3840
CALL
Gentex
GNTX
$4.02B
| $396K | ﹤0.01% |
18,200
+16,100
| +767% | +$376K |
2017 Q4
35 quarters
|
|
3841
PUT
WESCO International
WCC
$15.5B
| $396K | ﹤0.01% |
1,100
+800
| +267% | +$275K |
2018 Q2
33 quarters
|
|
3842
Magnolia Oil & Gas
MGY
$6.5B
| $395K | ﹤0.01% |
16,811
-69
| -0.4% | -$1.79K |
2026 Q1
2 quarters
|
|
3843
Camden Property Trust
CPT
$9.9B
| $395K | ﹤0.01% |
+4,081
| New | +$441K |
2026 Q3
0 quarters
|
|
3844
Vishay Precision Group
VPG
$661M
| $394K | ﹤0.01% |
5,419
-2,431
| -31% | -$197K |
2025 Q4
3 quarters
|
|
3845
CALL
Hyliion Holdings
HYLN
$440M
| $394K | ﹤0.01% |
94,500
+29,900
| +46% | +$116K |
2020 Q3
24 quarters
|
|
3846
Cannae Holdings
CNNE
$740M
| $394K | ﹤0.01% |
25,687
-2,891
| -10% | -$43.7K |
2026 Q1
2 quarters
|
|
3847
Crocs
CROX
$7.33B
| $394K | ﹤0.01% |
3,358
-16,375
| -83% | -$2.07M |
2020 Q4
23 quarters
|
|
3848
CALL
Brink's
BCO
$4.84B
| $394K | ﹤0.01% |
3,900
-8,600
| -69% | -$954K |
2026 Q2
1 quarter
|
|
3849
CALL
Churchill Downs
CHDN
$6.87B
| $394K | ﹤0.01% |
5,200
+1,300
| +33% | +$111K |
2026 Q2
1 quarter
|
|
3850
CALL
nCino
NCNO
$2.41B
| $393K | ﹤0.01% |
21,700
+5,900
| +37% | +$116K |
2020 Q3
24 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.