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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 | |
|---|---|---|---|---|---|---|---|
4601
CALL
Clearfield
CLFD
$402M
| $206K | ﹤0.01% |
6,600
-100
| -1% | -$3.04K |
2020 Q3
24 quarters
|
|
4602
CALL
iShares Nasdaq 100 ETF
IQQ
$279M
| $205K | ﹤0.01% |
+8,200
| New | +$198K |
2026 Q3
0 quarters
|
|
4603
Zymeworks
ZYME
$1.85B
| $205K | ﹤0.01% |
7,747
-11,684
| -60% | -$303K |
2024 Q1
10 quarters
|
|
4604
PUT
ASP Isotopes
ASPI
$267M
| $205K | ﹤0.01% |
77,400
-81,000
| -51% | -$322K |
2024 Q4
7 quarters
|
|
4605
CALL
Parsons
PSN
$5.25B
| $205K | ﹤0.01% |
5,000
-2,700
| -35% | -$133K |
2022 Q1
18 quarters
|
|
4606
PUT
Baozun
BZUN
$202M
| $205K | ﹤0.01% |
66,900
-180,100
| -73% | -$509K |
2024 Q3
8 quarters
|
|
4607
FTAI Infrastructure
FIP
$464M
| $204K | ﹤0.01% |
73,929
+57,486
| +350% | +$218K |
2025 Q2
5 quarters
|
|
4608
CALL
Nexa Resources
NEXA
$1.48B
| $204K | ﹤0.01% |
16,700
+800
| +5% | +$10.8K |
2026 Q2
1 quarter
|
|
4609
CALL
Onterris Inc
ONT
$817M
| $203K | ﹤0.01% |
15,200
-1,200
| -7% | -$21.9K |
2026 Q1
2 quarters
|
|
4610
WD-40
WDFC
$2.99B
| $203K | ﹤0.01% |
1,006
+723
| +255% | +$161K |
2025 Q4
3 quarters
|
|
4611
Gates Industrial Corp
GTES
$6.38B
| $203K | ﹤0.01% |
7,750
-16,113
| -68% | -$428K |
2025 Q2
5 quarters
|
|
4612
CALL
Helen of Troy
HELE
$873M
| $203K | ﹤0.01% |
7,400
+1,900
| +35% | +$53.7K |
2021 Q2
21 quarters
|
|
4613
PUT
Voyager Technologies
VOYG
$1.68B
| $203K | ﹤0.01% |
6,700
+1,200
| +22% | +$39.9K |
2025 Q2
5 quarters
|
|
4614
CALL
Vipshop
VIPS
$6.31B
| $203K | ﹤0.01% |
16,200
-29,500
| -65% | -$407K |
2014 Q4
47 quarters
|
|
4615
PUT
Cogent Communications
CCOI
$205M
| $203K | ﹤0.01% |
26,000
-16,000
| -38% | -$171K |
2021 Q2
21 quarters
|
|
|
4616
CALL
WD-40
WDFC
$2.99B
| $202K | ﹤0.01% |
1,000
+900
| +900% | +$200K |
2020 Q4
23 quarters
|
|
4617
PUT
Principal Financial Group
PFG
$24.1B
| $202K | ﹤0.01% |
1,800
-100
| -5% | -$11.3K |
2026 Q1
2 quarters
|
|
4618
CALL
Aduro Clean Technologies
ADUR
$349M
| $201K | ﹤0.01% |
16,100
-700
| -4% | -$10K |
2026 Q1
2 quarters
|
|
4619
Fortune Brands Innovations
FBIN
$5.69B
| $201K | ﹤0.01% |
5,282
-28,616
| -84% | -$1.33M |
2026 Q1
2 quarters
|
|
4620
CALL
Limbach Holdings
LMB
$657M
| $201K | ﹤0.01% |
4,100
-300
| -7% | -$17.3K |
2022 Q1
18 quarters
|
|
4621
PUT
Jack Henry & Associates
JKHY
$12.4B
| $201K | ﹤0.01% |
1,400
-1,500
| -52% | -$233K |
2025 Q3
4 quarters
|
|
4622
PUT
Thor Industries
THO
$3.99B
| $200K | ﹤0.01% |
2,900
-10,500
| -78% | -$792K |
2016 Q1
42 quarters
|
|
4623
International Seaways
INSW
$5.38B
| $200K | ﹤0.01% |
1,816
-7,752
| -81% | -$749K |
2026 Q2
1 quarter
|
|
4624
Arhaus
ARHS
$1.95B
| $200K | ﹤0.01% |
21,116
-32,056
| -60% | -$273K |
2026 Q1
2 quarters
|
|
4625
Matthews International
MATW
$587M
| $200K | ﹤0.01% |
10,416
+9,826
| +1,665% | +$232K |
2025 Q1
6 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.