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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 | |
|---|---|---|---|---|---|---|---|
2201
CALL
Advance Auto Parts
AAP
$2.76B
| $1.67M | ﹤0.01% |
42,800
-103,900
| -71% | -$5.2M |
2021 Q2
21 quarters
|
|
2202
PUT
GFL Environmental
GFL
$18.9B
| $1.66M | ﹤0.01% |
39,800
+36,700
| +1,184% | +$1.51M |
2026 Q2
1 quarter
|
|
2203
Tuttle Capital Pure Play Photonics ETF
FOTO
$99.5M
| $1.66M | ﹤0.01% |
92,068
+87,083
| +1,747% | +$1.66M |
2026 Q2
1 quarter
|
|
2204
CALL
PureCycle Technologies
PCT
$402M
| $1.66M | ﹤0.01% |
376,300
+101,900
| +37% | +$654K |
2021 Q2
21 quarters
|
|
2205
AngloGold Ashanti
AU
$46.5B
| $1.66M | ﹤0.01% |
17,663
+4,623
| +35% | +$439K |
2026 Q1
2 quarters
|
|
2206
CALL
Huntington Ingalls Industries
HII
$12.4B
| $1.66M | ﹤0.01% |
6,200
+5,800
| +1,450% | +$1.69M |
2017 Q3
36 quarters
|
|
2207
Magnite
MGNI
$4.19B
| $1.66M | ﹤0.01% |
+65,533
| New | +$1.47M |
2026 Q3
0 quarters
|
|
|
2208
PUT
Magnite
MGNI
$4.19B
| $1.65M | ﹤0.01% |
65,400
+44,800
| +217% | +$1.01M |
2020 Q3
24 quarters
|
|
2209
Target Hospitality
TH
$1.16B
| $1.65M | ﹤0.01% |
83,673
-53,557
| -39% | -$957K |
2024 Q1
10 quarters
|
|
2210
CALL
LSB Industries
LXU
$808M
| $1.64M | ﹤0.01% |
168,300
-800
| -0.5% | -$8.62K |
2020 Q3
24 quarters
|
|
2211
CALL
Huckleberry.ai, Inc. Class B Common Stock
HUCK
$160M
| $1.64M | ﹤0.01% |
493,400
-410,000
| -45% | -$1.51M |
2021 Q1
22 quarters
|
|
2212
CALL
BlackSky Technology
BKSY
$991M
| $1.63M | ﹤0.01% |
76,700
+28,800
| +60% | +$702K |
2021 Q4
19 quarters
|
|
2213
PUT
Burlington
BURL
$16.1B
| $1.63M | ﹤0.01% |
6,100
+1,900
| +45% | +$590K |
2021 Q2
21 quarters
|
|
2214
WIX.com
WIX
$2.86B
| $1.62M | ﹤0.01% |
+22,517
| New | +$1.53M |
2026 Q3
0 quarters
|
|
2215
CALL
Compass
COMP
$7.87B
| $1.62M | ﹤0.01% |
182,800
+5,100
| +3% | +$57.8K |
2021 Q2
21 quarters
|
|
2216
Genmab
GMAB
$33.1B
| $1.62M | ﹤0.01% |
+45,476
| New | +$1.44M |
2026 Q3
0 quarters
|
|
2217
PUT
Polaris
PII
$3.78B
| $1.62M | ﹤0.01% |
31,100
+14,200
| +84% | +$917K |
2017 Q1
38 quarters
|
|
2218
CALL
Alaska Air
ALK
$4.63B
| $1.62M | ﹤0.01% |
41,900
-112,800
| -73% | -$5.03M |
2021 Q2
21 quarters
|
|
2219
iShares Core S&P 500 ETF
IVV
$881B
| $1.62M | ﹤0.01% |
2,117
+921
| +77% | +$703K |
2026 Q2
1 quarter
|
|
2220
CALL
Citizens Financial Group
CFG
$27.4B
| $1.62M | ﹤0.01% |
25,400
+14,000
| +123% | +$985K |
2016 Q3
40 quarters
|
|
2221
Carrier Global
CARR
$44.7B
| $1.62M | ﹤0.01% |
29,504
-17,346
| -37% | -$1.07M |
2026 Q2
1 quarter
|
|
2222
CALL
Albertsons Companies
ACI
$6.12B
| $1.62M | ﹤0.01% |
139,200
+45,800
| +49% | +$579K |
2020 Q3
24 quarters
|
|
2223
PUT
Cohu
COHU
$2.18B
| $1.61M | ﹤0.01% |
23,700
+16,600
| +234% | +$900K |
2025 Q3
4 quarters
|
|
2224
PUT
Tenet Healthcare
THC
$23.3B
| $1.61M | ﹤0.01% |
6,300
-11,300
| -64% | -$2.78M |
2021 Q2
21 quarters
|
|
2225
Neurocrine Biosciences
NBIX
$17.7B
| $1.61M | ﹤0.01% |
11,346
+7,837
| +223% | +$1.26M |
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.