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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 | |
|---|---|---|---|---|---|---|---|
4526
PUT
Endeavour Silver
EXK
$2.27B
| $221K | ﹤0.01% |
25,700
-13,700
| -35% | -$128K |
2020 Q2
25 quarters
|
|
4527
CALL
James Hardie Industries
JHX
$16.2B
| $220K | ﹤0.01% |
8,700
-19,200
| -69% | -$530K |
2025 Q2
5 quarters
|
|
4528
CALL
Vulcan Materials
VMC
$35.8B
| $220K | ﹤0.01% |
900
-600
| -40% | -$163K |
2014 Q4
47 quarters
|
|
4529
NovaGold Resources
NG
$2.47B
| $220K | ﹤0.01% |
33,861
+13,995
| +70% | +$99.3K |
2025 Q4
3 quarters
|
|
4530
PUT
Consumer Portfolio Services
CPSS
$208M
| $220K | ﹤0.01% |
+24,000
| New | +$224K |
2026 Q3
0 quarters
|
|
4531
CALL
Affiliated Managers Group
AMG
$9.7B
| $219K | ﹤0.01% |
600
+400
| +200% | +$145K |
2026 Q2
1 quarter
|
|
4532
PUT
Atmos Energy
ATO
$29.8B
| $219K | ﹤0.01% |
1,400
-3,100
| -69% | -$526K |
2025 Q4
3 quarters
|
|
4533
Enliven Therapeutics
ELVN
$3.59B
| $219K | ﹤0.01% |
4,776
+4,320
| +947% | +$235K |
2025 Q1
6 quarters
|
|
4534
PUT
Hudbay
HBM
$9.5B
| $219K | ﹤0.01% |
8,200
-117,900
| -93% | -$3.01M |
2017 Q3
36 quarters
|
|
4535
DTE Energy
DTE
$29.1B
| $218K | ﹤0.01% |
+1,793
| New | +$249K |
2026 Q3
0 quarters
|
|
4536
PUT
Aecom
ACM
$9.07B
| $218K | ﹤0.01% |
3,700
-1,000
| -21% | -$66.7K |
2019 Q2
29 quarters
|
|
4537
CALL
Yext
YEXT
$759M
| $217K | ﹤0.01% |
33,600
+11,900
| +55% | +$70.3K |
2017 Q3
36 quarters
|
|
4538
Cadence Design Systems
CDNS
$88.6B
| $217K | ﹤0.01% |
658
-4,182
| -86% | -$1.37M |
2025 Q4
3 quarters
|
|
4539
CALL
Robinhood Ventures Fund I
RVI
$571M
| $217K | ﹤0.01% |
7,800
+7,600
| +3,800% | +$212K |
2026 Q2
1 quarter
|
|
4540
CALL
Energy Recovery
ERII
$369M
| $217K | ﹤0.01% |
32,500
-23,400
| -42% | -$187K |
2023 Q4
11 quarters
|
|
4541
PUT
EverQuote
EVER
$1B
| $217K | ﹤0.01% |
10,800
-1,400
| -11% | -$34K |
2024 Q1
10 quarters
|
|
4542
CALL
Bakkt Inc
BKKT
$153M
| $216K | ﹤0.01% |
27,700
+200
| +0.7% | +$1.59K |
2025 Q3
4 quarters
|
|
4543
Acacia Research
ACTG
$406M
| $216K | ﹤0.01% |
50,194
-14,909
| -23% | -$67.4K |
2025 Q3
4 quarters
|
|
4544
PUT
iShares Core Dividend ETF
DIVB
$2.37B
| $216K | ﹤0.01% |
2,900
+1,100
| +61% | +$73.1K |
2021 Q3
20 quarters
|
|
4545
Olema Pharmaceuticals
OLMA
$662M
| $216K | ﹤0.01% |
+25,013
| New | +$273K |
2026 Q3
0 quarters
|
|
4546
CALL
Chegg
CHGG
$63.9M
| $216K | ﹤0.01% |
297,200
+6,000
| +2% | +$5.08K |
2016 Q2
41 quarters
|
|
4547
Innovex International
INVX
$1.77B
| $216K | ﹤0.01% |
7,977
+7,925
| +15,240% | +$223K |
2025 Q1
6 quarters
|
|
4548
CALL
Puma Biotechnology
PBYI
$402M
| $215K | ﹤0.01% |
21,700
+16,800
| +343% | +$148K |
2021 Q2
21 quarters
|
|
4549
Chefs' Warehouse
CHEF
$4.64B
| $215K | ﹤0.01% |
1,921
+684
| +55% | +$72.9K |
2026 Q1
2 quarters
|
|
4550
PUT
Amylyx Pharmaceuticals
AMLX
$3.89B
| $215K | ﹤0.01% |
7,400
+6,700
| +957% | +$178K |
2022 Q1
18 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.