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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 | |
|---|---|---|---|---|---|---|---|
4401
Direxion Daily Homebuilders & Supplies Bull 3X ETF
NAIL
$520M
| $246K | ﹤0.01% |
8,748
-27,871
| -76% | -$1.06M |
2026 Q1
2 quarters
|
|
4402
CALL
Walker & Dunlop
WD
$1.32B
| $246K | ﹤0.01% |
7,000
+6,800
| +3,400% | +$300K |
2026 Q1
2 quarters
|
|
4403
Global X MSCI Colombia ETF
COLO
$167M
| $246K | ﹤0.01% |
5,208
-9,047
| -63% | -$428K |
2026 Q2
1 quarter
|
|
4404
CALL
Janux Therapeutics
JANX
$701M
| $245K | ﹤0.01% |
14,200
-3,000
| -17% | -$50.4K |
2024 Q1
10 quarters
|
|
4405
PUT
Delek Logistics
DKL
$3.06B
| $245K | ﹤0.01% |
4,600
+4,500
| +4,500% | +$250K |
2026 Q2
1 quarter
|
|
4406
Onity Group
ONIT
$229M
| $244K | ﹤0.01% |
8,613
-5,031
| -37% | -$183K |
2024 Q4
7 quarters
|
|
4407
PUT
Hamilton Lane
HLNE
$5.24B
| $243K | ﹤0.01% |
2,800
-5,300
| -65% | -$494K |
2026 Q2
1 quarter
|
|
4408
CALL
Alumis Inc
ALMS
$736M
| $243K | ﹤0.01% |
32,900
+25,700
| +357% | +$532K |
2025 Q2
5 quarters
|
|
4409
Popular Inc
BPOP
$9.8B
| $243K | ﹤0.01% |
+1,564
| New | +$264K |
2026 Q3
0 quarters
|
|
4410
Teucrium Soybean Fund
SOYB
$38.9M
| $243K | ﹤0.01% |
+8,825
| New | +$232K |
2026 Q3
0 quarters
|
|
4411
CALL
Syndax Pharmaceuticals
SNDX
$841M
| $243K | ﹤0.01% |
12,900
-12,100
| -48% | -$244K |
2018 Q3
32 quarters
|
|
4412
PUT
Gartner
IT
$12.1B
| $243K | ﹤0.01% |
1,300
-200
| -13% | -$34.1K |
2025 Q1
6 quarters
|
|
4413
Rithm Capital
RITM
$5.01B
| $242K | ﹤0.01% |
27,150
-48,163
| -64% | -$466K |
2024 Q3
8 quarters
|
|
4414
PUT
Broadridge
BR
$21.8B
| $242K | ﹤0.01% |
1,500
-4,200
| -74% | -$686K |
2026 Q1
2 quarters
|
|
4415
CALL
Oruka Therapeutics
ORKA
$7.05B
| $242K | ﹤0.01% |
2,900
-1,200
| -29% | -$113K |
2026 Q2
1 quarter
|
|
4416
PUT
Ironwood Pharmaceuticals
IRWD
$803M
| $241K | ﹤0.01% |
60,800
-83,200
| -58% | -$347K |
2026 Q1
2 quarters
|
|
4417
PUT
Serve Robotics
SERV
$229M
| $241K | ﹤0.01% |
51,900
-184,600
| -78% | -$926K |
2024 Q3
8 quarters
|
|
4418
TXNM Energy Inc
TXNM
$6.48B
| $241K | ﹤0.01% |
4,137
-1,007
| -20% | -$58.1K |
2025 Q2
5 quarters
|
|
4419
Direxion Daily Financial Bull 3x ETF
FAS
$2.24B
| $241K | ﹤0.01% |
+1,716
| New | +$293K |
2026 Q3
0 quarters
|
|
4420
First Trust Natural Gas ETF
FCG
$653M
| $241K | ﹤0.01% |
8,441
+4,837
| +134% | +$143K |
2024 Q3
8 quarters
|
|
4421
CALL
Laureate Education
LAUR
$4.76B
| $240K | ﹤0.01% |
+6,300
| New | +$236K |
2026 Q3
0 quarters
|
|
4422
DELISTED
Supernus Pharmaceuticals
SUPN
| $240K | ﹤0.01% |
5,585
+1,473
| +36% | +$67.1K |
2026 Q1
2 quarters
|
|
4423
CALL
NGL Energy Partners
NGL
$1.91B
| $240K | ﹤0.01% |
16,300
-12,200
| -43% | -$201K |
2022 Q2
17 quarters
|
|
4424
Cronos Group
CRON
$1.24B
| $240K | ﹤0.01% |
72,746
-150,982
| -67% | -$466K |
2025 Q2
5 quarters
|
|
4425
EPAM Systems
EPAM
$8.46B
| $240K | ﹤0.01% |
2,213
-2,148
| -49% | -$222K |
2026 Q2
1 quarter
|
|
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.