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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 | |
|---|---|---|---|---|---|---|---|
4351
Veradermics Inc
MANE
$5.55B
| $255K | ﹤0.01% |
+2,104
| New | +$230K |
2026 Q3
0 quarters
|
|
4352
CALL
Bausch + Lomb
BLCO
$7.59B
| $255K | ﹤0.01% |
15,000
+6,200
| +70% | +$105K |
2022 Q2
17 quarters
|
|
4353
CALL
FS KKR Capital
FSK
$3.18B
| $255K | ﹤0.01% |
23,200
-400
| -2% | -$4.59K |
2019 Q4
27 quarters
|
|
4354
CALL
Tyler Technologies
TYL
$16.9B
| $255K | ﹤0.01% |
800
-3,100
| -79% | -$1.02M |
2026 Q1
2 quarters
|
|
4355
CALL
Candel Therapeutics
CADL
$484M
| $255K | ﹤0.01% |
24,400
+15,900
| +187% | +$176K |
2024 Q2
9 quarters
|
|
4356
CALL
Cresud
CRESY
$693M
| $254K | ﹤0.01% |
22,100
+21,000
| +1,909% | +$239K |
2026 Q1
2 quarters
|
|
4357
CALL
Cooper-Standard Automotive
CPS
$321M
| $254K | ﹤0.01% |
12,200
-5,200
| -30% | -$139K |
2020 Q4
23 quarters
|
|
4358
CALL
McEwen Inc
MUX
$732M
| $253K | ﹤0.01% |
14,200
+700
| +5% | +$13.1K |
2021 Q2
21 quarters
|
|
4359
PUT
Paysign
PAYS
$534M
| $253K | ﹤0.01% |
+18,800
| New | +$213K |
2026 Q3
0 quarters
|
|
4360
Northern Oil and Gas
NOG
$2.63B
| $253K | ﹤0.01% |
+11,070
| New | +$256K |
2026 Q3
0 quarters
|
|
|
4361
Cooper-Standard Automotive
CPS
$321M
| $253K | ﹤0.01% |
12,153
+10,890
| +862% | +$290K |
2024 Q3
8 quarters
|
|
4362
CrowdStrike
CRWD
$231B
| $253K | ﹤0.01% |
956
-1,880
| -66% | -$399K |
2026 Q2
1 quarter
|
|
4363
PUT
GeneDx Holdings
WGS
$1.52B
| $253K | ﹤0.01% |
3,500
+1,100
| +46% | +$85.2K |
2023 Q1
14 quarters
|
|
4364
CALL
Kodiak AI
KDK
$233M
| $253K | ﹤0.01% |
131,700
-122,100
| -48% | -$489K |
2025 Q2
5 quarters
|
|
4365
PUT
Dauch Corp
DCH
$1.12B
| $253K | ﹤0.01% |
48,400
+31,100
| +180% | +$185K |
2026 Q1
2 quarters
|
|
4366
CALL
PTC
PTC
$21.3B
| $253K | ﹤0.01% |
1,800
-10,300
| -85% | -$1.41M |
2026 Q2
1 quarter
|
|
4367
Camping World
CWH
$440M
| $252K | ﹤0.01% |
50,287
+8,625
| +21% | +$53.6K |
2026 Q1
2 quarters
|
|
4368
PUT
Prime Medicine
PRME
$778M
| $252K | ﹤0.01% |
82,600
+28,300
| +52% | +$94K |
2024 Q4
7 quarters
|
|
4369
PUT
Wealthfront Corp
WLTH
$1.65B
| $252K | ﹤0.01% |
24,300
+4,900
| +25% | +$46.8K |
2026 Q1
2 quarters
|
|
4370
CALL
Construction Partners
ROAD
$4.61B
| $252K | ﹤0.01% |
2,800
-1,300
| -32% | -$135K |
2024 Q3
8 quarters
|
|
4371
NB Bancorp
NBBK
$956M
| $252K | ﹤0.01% |
11,394
+9,643
| +551% | +$215K |
2026 Q1
2 quarters
|
|
4372
CALL
EquipmentShare.com Inc
EQPT
$3.86B
| $252K | ﹤0.01% |
14,500
-53,200
| -79% | -$984K |
2026 Q1
2 quarters
|
|
4373
CALL
GoPro
GPRO
$120M
| $251K | ﹤0.01% |
194,800
+55,500
| +40% | +$50.4K |
2021 Q2
21 quarters
|
|
4374
CALL
Scholar Rock
SRRK
$5.3B
| $251K | ﹤0.01% |
5,200
-1,500
| -22% | -$79K |
2023 Q2
13 quarters
|
|
4375
CALL
SLM Corp
SLM
$3.21B
| $251K | ﹤0.01% |
11,100
+3,500
| +46% | +$90.1K |
2021 Q2
21 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.