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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 | |
|---|---|---|---|---|---|---|---|
4851
PUT
Waystar Holding Corp
WAY
$5.41B
| $165K | ﹤0.01% |
6,500
-5,000
| -43% | -$120K |
2024 Q3
8 quarters
|
|
4852
CALL
American Financial Group
AFG
$13.3B
| $164K | ﹤0.01% |
1,200
+400
| +50% | +$57K |
2026 Q1
2 quarters
|
|
4853
CALL
VinFast Auto
VFS
$7.16B
| $164K | ﹤0.01% |
52,600
+38,200
| +265% | +$119K |
2023 Q3
12 quarters
|
|
4854
PUT
ADS-TEC Energy
ADSE
$680M
| $164K | ﹤0.01% |
14,900
-100
| -0.7% | -$1.17K |
2025 Q4
3 quarters
|
|
4855
PUT
Fortune Brands Innovations
FBIN
$5.64B
| $164K | ﹤0.01% |
4,300
-27,800
| -87% | -$1.29M |
2026 Q1
2 quarters
|
|
4856
CALL
Global Ship Lease
GSL
$1.56B
| $163K | ﹤0.01% |
3,700
-900
| -20% | -$38.9K |
2021 Q4
19 quarters
|
|
4857
CALL
Zai Lab
ZLAB
$3.23B
| $163K | ﹤0.01% |
6,200
+5,900
| +1,967% | +$136K |
2023 Q4
11 quarters
|
|
4858
PUT
Curtiss-Wright
CW
$17.3B
| $163K | ﹤0.01% |
300
+200
| +200% | +$132K |
2025 Q4
3 quarters
|
|
4859
CALL
Hilton Grand Vacations
HGV
$3.33B
| $163K | ﹤0.01% |
4,700
-900
| -16% | -$39.9K |
2026 Q1
2 quarters
|
|
4860
CALL
Telephone and Data Systems
TDS
$3.36B
| $163K | ﹤0.01% |
4,800
-13,500
| -74% | -$472K |
2019 Q2
29 quarters
|
|
4861
PUT
Customers Bancorp
CUBI
$2.84B
| $163K | ﹤0.01% |
+2,200
| New | +$173K |
2026 Q3
0 quarters
|
|
4862
PUT
Rush Street Interactive
RSI
$1.36B
| $163K | ﹤0.01% |
8,000
+5,500
| +220% | +$150K |
2023 Q1
14 quarters
|
|
4863
CALL
Faraday Future Intelligent Electric
FFAI
$1.28M
| $163K | ﹤0.01% |
134,400
+132,834
| +8,482% | +$1.13M |
2026 Q1
2 quarters
|
|
4864
PUT
Teekay
TK
$1.17B
| $162K | ﹤0.01% |
11,400
+6,600
| +138% | +$81.7K |
2014 Q4
47 quarters
|
|
4865
NiSource
NI
$22B
| $162K | ﹤0.01% |
4,163
+3,999
| +2,438% | +$172K |
2025 Q1
6 quarters
|
|
4866
PUT
Granite Construction
GVA
$5.55B
| $162K | ﹤0.01% |
1,400
+900
| +180% | +$111K |
2026 Q1
2 quarters
|
|
4867
CALL
Manulife Financial
MFC
$72.6B
| $162K | ﹤0.01% |
3,800
-2,600
| -41% | -$113K |
2016 Q2
41 quarters
|
|
4868
CMB.TECH NV
CMBT
$5.11B
| $162K | ﹤0.01% |
8,549
+5,583
| +188% | +$96.4K |
2025 Q3
4 quarters
|
|
4869
CALL
Silence Therapeutics
SLN
$1.23B
| $162K | ﹤0.01% |
14,800
+9,300
| +169% | +$113K |
2025 Q4
3 quarters
|
|
4870
Kyndryl
KD
$3.72B
| $162K | ﹤0.01% |
+14,366
| New | +$182K |
2026 Q3
0 quarters
|
|
4871
PUT
ITT
ITT
$19.1B
| $161K | ﹤0.01% |
800
+300
| +60% | +$60.5K |
2025 Q3
4 quarters
|
|
4872
PUT
Global X S&P 500 Covered Call ETF
XYLD
$3.36B
| $161K | ﹤0.01% |
3,900
-300
| -7% | -$12.4K |
2025 Q4
3 quarters
|
|
4873
Snap-on
SNA
$19B
| $161K | ﹤0.01% |
+444
| New | +$175K |
2026 Q3
0 quarters
|
|
4874
PUT
Matthews International
MATW
$590M
| $161K | ﹤0.01% |
8,400
+4,600
| +121% | +$108K |
2025 Q3
4 quarters
|
|
4875
PUT
Leonardo DRS
DRS
$9.5B
| $161K | ﹤0.01% |
4,400
-2,000
| -31% | -$83.4K |
2022 Q4
15 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.