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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 | |
|---|---|---|---|---|---|---|---|
3151
PUT
Root
ROOT
$663M
| $701K | ﹤0.01% |
15,200
+9,000
| +145% | +$499K |
2020 Q4
23 quarters
|
|
3152
LG Display
LPL
$2.57B
| $699K | ﹤0.01% |
237,105
-102,722
| -30% | -$336K |
2024 Q3
8 quarters
|
|
3153
PUT
Hallador Energy
HNRG
$512M
| $699K | ﹤0.01% |
50,400
-146,300
| -74% | -$2.28M |
2022 Q2
17 quarters
|
|
3154
CALL
Vivmark Residential
VMRK
$49.5B
| $699K | ﹤0.01% |
+11,500
| New | +$760K |
2026 Q3
0 quarters
|
|
3155
PUT
Titan America SA
TTAM
$2.1B
| $698K | ﹤0.01% |
51,200
+49,100
| +2,338% | +$768K |
2026 Q2
1 quarter
|
|
3156
STMicroelectronics
STM
$41.5B
| $698K | ﹤0.01% |
13,073
-15,567
| -54% | -$863K |
2026 Q1
2 quarters
|
|
3157
CALL
ASP Isotopes
ASPI
$287M
| $697K | ﹤0.01% |
263,000
+22,000
| +9% | +$87.5K |
2024 Q4
7 quarters
|
|
3158
CALL
Nordic American Tanker
NAT
$1.42B
| $695K | ﹤0.01% |
88,000
+11,100
| +14% | +$75.5K |
2026 Q1
2 quarters
|
|
3159
PUT
Omeros
OMER
$1.3B
| $695K | ﹤0.01% |
36,500
-104,900
| -74% | -$1.59M |
2014 Q4
47 quarters
|
|
3160
Defiance Quantum ETF
QTUM
$4.93B
| $695K | ﹤0.01% |
4,581
+2,484
| +118% | +$370K |
2025 Q4
3 quarters
|
|
3161
CALL
New York Times
NYT
$11.4B
| $694K | ﹤0.01% |
10,900
+6,800
| +166% | +$472K |
2016 Q4
39 quarters
|
|
3162
Phillips 66
PSX
$103B
| $694K | ﹤0.01% |
2,718
+1,981
| +269% | +$453K |
2026 Q2
1 quarter
|
|
3163
Direxion Daily MU Bull 2X ETF
MUU
$2.27B
| $692K | ﹤0.01% |
18,806
-24,094
| -56% | -$762K |
2026 Q2
1 quarter
|
|
3164
CALL
Murphy Oil
MUR
$5.21B
| $692K | ﹤0.01% |
18,700
+13,000
| +228% | +$472K |
2021 Q2
21 quarters
|
|
3165
PUT
LandBridge Corporation
LB
$2.1B
| $690K | ﹤0.01% |
8,500
-600
| -7% | -$48.6K |
2024 Q4
7 quarters
|
|
3166
Direxion Daily Semiconductor Bear 3X ETF
SOXS
$4.24B
| $690K | ﹤0.01% |
20,856
-14,393
| -41% | -$657K |
2026 Q2
1 quarter
|
|
3167
abrdn Physical Gold Shares ETF
SGOL
$6.47B
| $690K | ﹤0.01% |
+17,436
| New | +$708K |
2026 Q3
0 quarters
|
|
3168
CALL
Wabtec
WAB
$50.4B
| $689K | ﹤0.01% |
2,400
+2,200
| +1,100% | +$626K |
2015 Q3
44 quarters
|
|
3169
PUT
Legend Biotech
LEGN
$3.6B
| $688K | ﹤0.01% |
34,600
+14,700
| +74% | +$314K |
2021 Q1
22 quarters
|
|
3170
VeriSign
VRSN
$28B
| $688K | ﹤0.01% |
+2,439
| New | +$692K |
2026 Q3
0 quarters
|
|
3171
PUT
Medpace
MEDP
$18.4B
| $687K | ﹤0.01% |
1,100
+800
| +267% | +$469K |
2023 Q4
11 quarters
|
|
3172
CALL
Biohaven
BHVN
$2.13B
| $686K | ﹤0.01% |
51,400
+22,500
| +78% | +$325K |
2022 Q4
15 quarters
|
|
3173
CALL
Teekay
TK
$1.17B
| $685K | ﹤0.01% |
48,100
-9,500
| -16% | -$118K |
2020 Q2
25 quarters
|
|
3174
PUT
United Natural Foods
UNFI
$2.86B
| $685K | ﹤0.01% |
15,300
+12,700
| +488% | +$598K |
2021 Q2
21 quarters
|
|
3175
CALL
Aura Minerals Inc
AUGO
$6.54B
| $685K | ﹤0.01% |
8,700
+8,400
| +2,800% | +$614K |
2025 Q4
3 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.