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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 | |
|---|---|---|---|---|---|---|---|
2176
Penguin Solutions Inc
PENG
$2.52B
| $1.71M | ﹤0.01% |
31,328
-18,746
| -37% | -$1.06M |
2025 Q4
3 quarters
|
|
2177
CALL
KeyCorp
KEY
$22.6B
| $1.71M | ﹤0.01% |
85,300
-46,200
| -35% | -$1.03M |
2021 Q2
21 quarters
|
|
2178
PUT
Mobileye
MBLY
$4.91B
| $1.71M | ﹤0.01% |
231,500
-5,400
| -2% | -$46.3K |
2022 Q4
15 quarters
|
|
2179
CALL
Clorox
CLX
$12.9B
| $1.71M | ﹤0.01% |
21,100
-20,100
| -49% | -$1.93M |
2014 Q4
47 quarters
|
|
2180
CALL
Xerox
XRX
$135M
| $1.71M | ﹤0.01% |
829,300
-4,300
| -0.5% | -$13.1K |
2021 Q2
21 quarters
|
|
2181
PUT
American International
AIG
$43B
| $1.7M | ﹤0.01% |
22,900
-5,900
| -20% | -$456K |
2021 Q2
21 quarters
|
|
2182
CALL
Freshworks
FRSH
$3.17B
| $1.7M | ﹤0.01% |
133,100
-20,000
| -13% | -$238K |
2021 Q4
19 quarters
|
|
2183
Bilibili
BILI
$5.58B
| $1.7M | ﹤0.01% |
113,275
+26,623
| +31% | +$451K |
2023 Q3
12 quarters
|
|
2184
CALL
HDFC Bank
HDB
$134B
| $1.7M | ﹤0.01% |
76,100
+40,500
| +114% | +$963K |
2017 Q1
38 quarters
|
|
2185
PUT
Firefly Aerospace
FLY
$4.45B
| $1.7M | ﹤0.01% |
73,400
-6,100
| -8% | -$139K |
2025 Q3
4 quarters
|
|
2186
PUT
BigBear.ai
BBAI
$1.11B
| $1.69M | ﹤0.01% |
639,300
-113,500
| -15% | -$342K |
2021 Q4
19 quarters
|
|
2187
Bank of Montreal
BMO
$121B
| $1.69M | ﹤0.01% |
+10,123
| New | +$1.79M |
2026 Q3
0 quarters
|
|
2188
PUT
Aquestive Therapeutics
AQST
$450M
| $1.69M | ﹤0.01% |
365,600
+313,200
| +598% | +$1.39M |
2024 Q1
10 quarters
|
|
2189
Cloudflare
NET
$113B
| $1.69M | ﹤0.01% |
4,874
-19,534
| -80% | -$5.79M |
2026 Q2
1 quarter
|
|
2190
CALL
McCormick & Company Non-Voting
MKC
$12.6B
| $1.69M | ﹤0.01% |
36,400
-9,100
| -20% | -$474K |
2017 Q1
38 quarters
|
|
2191
CALL
Ionis Pharmaceuticals
IONS
$4.71B
| $1.68M | ﹤0.01% |
37,700
-5,000
| -12% | -$284K |
2014 Q4
47 quarters
|
|
2192
CALL
Molina Healthcare
MOH
$10.9B
| $1.68M | ﹤0.01% |
8,900
-1,000
| -10% | -$206K |
2017 Q1
38 quarters
|
|
2193
PUT
Gorilla Technology Group
GRRR
$230M
| $1.68M | ﹤0.01% |
121,300
+102,000
| +528% | +$1.44M |
2026 Q1
2 quarters
|
|
2194
PUT
Sherwin-Williams
SHW
$85.9B
| $1.68M | ﹤0.01% |
5,200
-11,300
| -68% | -$3.82M |
2014 Q4
47 quarters
|
|
2195
PUT
GoDaddy
GDDY
$13.8B
| $1.68M | ﹤0.01% |
17,600
+12,700
| +259% | +$1.21M |
2017 Q3
36 quarters
|
|
2196
CALL
Metalla Royalty & Streaming
MTA
$721M
| $1.68M | ﹤0.01% |
178,300
+164,200
| +1,165% | +$1.48M |
2026 Q1
2 quarters
|
|
2197
Under Armour
UAA
$2.15B
| $1.68M | ﹤0.01% |
376,315
-365,023
| -49% | -$2.11M |
2023 Q3
12 quarters
|
|
2198
GraniteShares 2x Long MU Daily ETF
MULL
$342M
| $1.67M | ﹤0.01% |
65,322
-9,847
| -13% | -$217K |
2026 Q1
2 quarters
|
|
2199
PUT
Enterprise Products Partners
EPD
$80.1B
| $1.67M | ﹤0.01% |
47,000
-23,900
| -34% | -$912K |
2021 Q2
21 quarters
|
|
2200
PUT
Arrowhead Research
ARWR
$6.97B
| $1.67M | ﹤0.01% |
25,500
+13,200
| +107% | +$1.07M |
2026 Q1
2 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.