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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 | |
|---|---|---|---|---|---|---|---|
3501
CALL
Xanadu Quantum Technologies Class B
XNDU
$729M
| $528K | ﹤0.01% |
115,300
+91,800
| +391% | +$891K |
2026 Q2
1 quarter
|
|
3502
VistaShares Artificial Intelligence Supercycle ETF
AIS
$882M
| $527K | ﹤0.01% |
7,056
-1
| -0% | -$70 |
2025 Q4
3 quarters
|
|
3503
CALL
Brookfield Renewable
BEP
$9.02B
| $526K | ﹤0.01% |
18,700
-19,100
| -51% | -$609K |
2026 Q1
2 quarters
|
|
3504
PUT
Nordic American Tanker
NAT
$1.41B
| $526K | ﹤0.01% |
66,600
-32,600
| -33% | -$222K |
2026 Q1
2 quarters
|
|
3505
PUT
Bausch Health
BHC
$3.13B
| $526K | ﹤0.01% |
90,200
+800
| +0.9% | +$4.62K |
2021 Q2
21 quarters
|
|
3506
CALL
WaterBridge Infrastructure LLC
WBI
$1.53B
| $526K | ﹤0.01% |
18,700
+16,600
| +790% | +$538K |
2026 Q2
1 quarter
|
|
3507
Caris Life Sciences
CAI
$6.56B
| $525K | ﹤0.01% |
17,134
+3,725
| +28% | +$83.7K |
2025 Q2
5 quarters
|
|
3508
CALL
Ivanhoe Electric
IE
$1.07B
| $525K | ﹤0.01% |
52,900
+4,100
| +8% | +$40.9K |
2024 Q1
10 quarters
|
|
3509
CALL
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$414M
| $524K | ﹤0.01% |
2,400
-2,000
| -45% | -$33.3K |
2022 Q1
18 quarters
|
|
3510
PUT
Gold Fields
GFI
$31.6B
| $524K | ﹤0.01% |
14,500
-11,600
| -44% | -$456K |
2019 Q2
29 quarters
|
|
3511
CALL
Genesco
GCO
$387M
| $522K | ﹤0.01% |
+15,300
| New | +$539K |
2026 Q3
0 quarters
|
|
3512
CALL
Idexx Laboratories
IDXX
$55.5B
| $522K | ﹤0.01% |
+1,000
| New | +$548K |
2026 Q3
0 quarters
|
|
3513
PUT
Ginkgo Bioworks
DNA
$612M
| $522K | ﹤0.01% |
40,700
+13,300
| +49% | +$108K |
2026 Q1
2 quarters
|
|
3514
CALL
Arrow Electronics
ARW
$9.7B
| $522K | ﹤0.01% |
2,300
+1,400
| +156% | +$297K |
2025 Q3
4 quarters
|
|
3515
CALL
Insulet
PODD
$10.5B
| $522K | ﹤0.01% |
4,000
-200
| -5% | -$29.9K |
2017 Q4
35 quarters
|
|
3516
PUT
Bicycle Therapeutics
BCYC
$237M
| $522K | ﹤0.01% |
141,800
-106,900
| -43% | -$432K |
2022 Q2
17 quarters
|
|
3517
PUT
ARK 21Shares Bitcoin ETF
ARKB
$2.62B
| $521K | ﹤0.01% |
18,800
+5,000
| +36% | +$118K |
2024 Q4
7 quarters
|
|
3518
PUT
Revvity
RVTY
$17.1B
| $520K | ﹤0.01% |
3,400
+3,000
| +750% | +$369K |
2025 Q2
5 quarters
|
|
3519
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.97B
| $519K | ﹤0.01% |
14,500
+11,800
| +437% | +$455K |
2026 Q1
2 quarters
|
|
3520
Douglas Emmett
DEI
$1.63B
| $519K | ﹤0.01% |
54,176
+31,215
| +136% | +$359K |
2026 Q2
1 quarter
|
|
3521
PUT
Enovis
ENOV
$1.63B
| $519K | ﹤0.01% |
28,400
-18,300
| -39% | -$435K |
2019 Q1
30 quarters
|
|
3522
T-REX 2X Long SNDK Daily Target ETF
SNDU
$46.5M
| $518K | ﹤0.01% |
20,084
+16,257
| +425% | +$402K |
2026 Q2
1 quarter
|
|
|
3523
CALL
Caris Life Sciences
CAI
$6.56B
| $518K | ﹤0.01% |
16,900
+8,100
| +92% | +$182K |
2025 Q2
5 quarters
|
|
3524
PUT
Federal Agricultural Mortgage Class A
AGM.A
$1.37B
| $517K | ﹤0.01% |
2,500
+2,000
| +400% | +$308K |
2026 Q2
1 quarter
|
|
3525
DELISTED
CBIZ
CBZ
| $517K | ﹤0.01% |
9,457
+2,571
| +37% | +$129K |
2025 Q4
3 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.