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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 | |
|---|---|---|---|---|---|---|---|
2926
PUT
DELISTED
Kenvue
KVUE
| $855K | ﹤0.01% |
48,400
-43,700
| -47% | -$823K |
2023 Q2
13 quarters
|
|
2927
CALL
American Water Works
AWK
$29.4B
| $855K | ﹤0.01% |
6,600
-16,200
| -71% | -$2.19M |
2015 Q2
45 quarters
|
|
2928
PUT
Star Bulk Carriers
SBLK
$3.3B
| $854K | ﹤0.01% |
29,100
-76,000
| -72% | -$2.2M |
2017 Q1
38 quarters
|
|
2929
CALL
ArriVent BioPharma
AVBP
$676M
| $854K | ﹤0.01% |
28,200
-16,800
| -37% | -$515K |
2026 Q1
2 quarters
|
|
2930
PUT
Forum Markets
FRMM
$31.1M
| $853K | ﹤0.01% |
180,700
-200
| -0.1% | -$1.11K |
2025 Q3
4 quarters
|
|
2931
PUT
BioMarin Pharmaceuticals
BMRN
$11B
| $852K | ﹤0.01% |
14,200
+9,200
| +184% | +$579K |
2014 Q4
47 quarters
|
|
2932
CALL
Microvision
MVIS
$37.1M
| $851K | ﹤0.01% |
567,400
+536,067
| +1,711% | +$1.63M |
2021 Q2
21 quarters
|
|
2933
Amplify Cybersecurity ETF
HACK
$3.35B
| $851K | ﹤0.01% |
7,017
+2,613
| +59% | +$296K |
2025 Q4
3 quarters
|
|
2934
CALL
Fulcrum Therapeutics
FULC
$281M
| $848K | ﹤0.01% |
229,200
-16,800
| -7% | -$63K |
2026 Q2
1 quarter
|
|
2935
CALL
ITT
ITT
$19.1B
| $848K | ﹤0.01% |
4,200
-6,500
| -61% | -$1.31M |
2020 Q3
24 quarters
|
|
2936
ProShares K-1 Free Crude Oil Strategy ETF
OILK
$262M
| $844K | ﹤0.01% |
14,565
-7,606
| -34% | -$406K |
2026 Q1
2 quarters
|
|
2937
PUT
Texas Roadhouse
TXRH
$12.2B
| $844K | ﹤0.01% |
5,400
+5,100
| +1,700% | +$974K |
2017 Q3
36 quarters
|
|
2938
CALL
CMB.TECH NV
CMBT
$5.11B
| $842K | ﹤0.01% |
44,500
+6,400
| +17% | +$110K |
2019 Q4
27 quarters
|
|
2939
Cirrus Logic
CRUS
$6.07B
| $842K | ﹤0.01% |
+7,020
| New | +$882K |
2026 Q3
0 quarters
|
|
2940
PUT
RadNet
RDNT
$5.99B
| $841K | ﹤0.01% |
12,200
+9,100
| +294% | +$641K |
2018 Q2
33 quarters
|
|
2941
PUT
Ollie's Bargain Outlet
OLLI
$5.63B
| $839K | ﹤0.01% |
9,800
+4,800
| +96% | +$355K |
2017 Q2
37 quarters
|
|
2942
Monolithic Power Systems
MPWR
$70.6B
| $839K | ﹤0.01% |
+623
| New | +$816K |
2026 Q3
0 quarters
|
|
2943
Marsh
MRSH
$97.8B
| $839K | ﹤0.01% |
4,914
+4,383
| +825% | +$802K |
2025 Q4
3 quarters
|
|
2944
PUT
Kosmos Energy
KOS
$1.3B
| $839K | ﹤0.01% |
330,300
-72,300
| -18% | -$188K |
2020 Q4
23 quarters
|
|
2945
PUT
Reinsurance Group of America
RGA
$17.8B
| $837K | ﹤0.01% |
3,400
+3,300
| +3,300% | +$798K |
2026 Q2
1 quarter
|
|
2946
PUT
Globalstar
GSAT
$11.2B
| $837K | ﹤0.01% |
10,100
+2,600
| +35% | +$212K |
2020 Q4
23 quarters
|
|
2947
Qualys
QLYS
$6.04B
| $836K | ﹤0.01% |
4,464
-2,099
| -32% | -$353K |
2025 Q2
5 quarters
|
|
2948
PUT
Toll Brothers
TOL
$13.6B
| $835K | ﹤0.01% |
6,200
-26,300
| -81% | -$3.82M |
2015 Q3
44 quarters
|
|
2949
Fidelity National Information Services
FIS
$14.6B
| $835K | ﹤0.01% |
25,393
+14,541
| +134% | +$589K |
2026 Q1
2 quarters
|
|
2950
CALL
Starling Oncology
STLN
$382M
| $835K | ﹤0.01% |
132,100
+37,400
| +39% | +$224K |
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.