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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 | |
|---|---|---|---|---|---|---|---|
1776
CALL
CoreCivic
CXW
$2.82B
| $2.47M | ﹤0.01% |
76,700
+900
| +1% | +$29.2K |
2015 Q4
43 quarters
|
|
1777
CALL
Klarna Group
KLAR
$5.11B
| $2.47M | ﹤0.01% |
199,400
+72,900
| +58% | +$1.22M |
2025 Q3
4 quarters
|
|
1778
CALL
Weyerhaeuser
WY
$14.9B
| $2.47M | ﹤0.01% |
129,600
-18,700
| -13% | -$436K |
2015 Q2
45 quarters
|
|
1779
Vishay Intertechnology
VSH
$4.47B
| $2.47M | ﹤0.01% |
75,831
-45,242
| -37% | -$1.58M |
2025 Q4
3 quarters
|
|
1780
CALL
Clover Health Investments
CLOV
$2.66B
| $2.46M | ﹤0.01% |
571,700
-18,600
| -3% | -$83.4K |
2026 Q1
2 quarters
|
|
1781
JPMorgan Nasdaq Equity Premium Income ETF
JEPQ
$42.5B
| $2.46M | ﹤0.01% |
+40,219
| New | +$2.4M |
2026 Q3
0 quarters
|
|
1782
CALL
XPO
XPO
$22B
| $2.46M | ﹤0.01% |
14,000
-900
| -6% | -$177K |
2021 Q2
21 quarters
|
|
1783
CALL
Canadian National Railway
CNI
$76.5B
| $2.46M | ﹤0.01% |
20,700
+18,600
| +886% | +$2.32M |
2016 Q1
42 quarters
|
|
1784
PUT
First Horizon
FHN
$11.1B
| $2.46M | ﹤0.01% |
106,900
+30,100
| +39% | +$752K |
2019 Q4
27 quarters
|
|
1785
Amkor Technology
AMKR
$9.44B
| $2.46M | ﹤0.01% |
46,943
-2,108
| -4% | -$117K |
2026 Q2
1 quarter
|
|
1786
CALL
Ingersoll Rand
IR
$32.7B
| $2.46M | ﹤0.01% |
32,700
+14,200
| +77% | +$1.13M |
2017 Q4
35 quarters
|
|
1787
Datadog
DDOG
$66.6B
| $2.45M | ﹤0.01% |
+8,959
| New | +$2.22M |
2026 Q3
0 quarters
|
|
1788
PUT
Amdocs
DOX
$4.5B
| $2.45M | ﹤0.01% |
42,800
+3,800
| +10% | +$218K |
2023 Q3
12 quarters
|
|
1789
PUT
MPLX
MPLX
$57.5B
| $2.44M | ﹤0.01% |
43,400
-800
| -2% | -$46.7K |
2015 Q1
46 quarters
|
|
1790
CALL
Century Aluminum
CENX
$3.63B
| $2.44M | ﹤0.01% |
67,900
+4,500
| +7% | +$199K |
2021 Q2
21 quarters
|
|
1791
CALL
Kosmos Energy
KOS
$1.21B
| $2.44M | ﹤0.01% |
961,200
-211,900
| -18% | -$551K |
2021 Q2
21 quarters
|
|
1792
PUT
Crescent Energy
CRGY
$4.9B
| $2.44M | ﹤0.01% |
189,400
+79,800
| +73% | +$978K |
2021 Q4
19 quarters
|
|
1793
XP
XP
$7.8B
| $2.43M | ﹤0.01% |
+115,759
| New | +$2.06M |
2026 Q3
0 quarters
|
|
1794
CALL
Dropbox
DBX
$7.21B
| $2.43M | ﹤0.01% |
71,700
+17,300
| +32% | +$572K |
2018 Q2
33 quarters
|
|
1795
PUT
Life Time Group Holdings
LTH
$10.7B
| $2.42M | ﹤0.01% |
60,800
+43,700
| +256% | +$1.86M |
2026 Q1
2 quarters
|
|
1796
CALL
Adeia
ADEA
$1.89B
| $2.42M | ﹤0.01% |
94,700
+9,600
| +11% | +$258K |
2023 Q1
14 quarters
|
|
1797
CALL
Shoe Station Group
SHOE
$394M
| $2.42M | ﹤0.01% |
189,100
+182,900
| +2,950% | +$2.64M |
2025 Q4
3 quarters
|
|
1798
CALL
Mettler-Toledo International
MTD
$34.8B
| $2.42M | ﹤0.01% |
1,600
+900
| +129% | +$1.24M |
2026 Q1
2 quarters
|
|
1799
PUT
Agilent Technologies
A
$49.9B
| $2.41M | ﹤0.01% |
14,000
+11,000
| +367% | +$1.62M |
2016 Q4
39 quarters
|
|
1800
CALL
Hudbay
HBM
$9.7B
| $2.41M | ﹤0.01% |
90,400
-37,400
| -29% | -$954K |
2020 Q1
26 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.