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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 | |
|---|---|---|---|---|---|---|---|
1501
PC Connection
CNXN
$2.11B
| $3.32M | ﹤0.01% |
36,809
+24,518
| +199% | +$2.01M |
2026 Q2
1 quarter
|
|
1502
PUT
POET Technologies
POET
$967M
| $3.32M | ﹤0.01% |
443,200
-193,500
| -30% | -$1.54M |
2024 Q2
9 quarters
|
|
1503
PUT
Allstate
ALL
$64.9B
| $3.31M | ﹤0.01% |
14,900
-1,900
| -11% | -$482K |
2018 Q1
34 quarters
|
|
1504
3M
MMM
$97.4B
| $3.3M | ﹤0.01% |
20,116
+3,374
| +20% | +$575K |
2023 Q3
12 quarters
|
|
1505
CALL
Royalty Pharma
RPRX
$31.2B
| $3.3M | ﹤0.01% |
56,500
+500
| +0.9% | +$29.5K |
2020 Q2
25 quarters
|
|
1506
CALL
Darling Ingredients
DAR
$8.55B
| $3.3M | ﹤0.01% |
54,300
+18,000
| +50% | +$1.13M |
2016 Q4
39 quarters
|
|
1507
SiriusXM
SIRI
$10.9B
| $3.29M | ﹤0.01% |
127,246
+78,583
| +161% | +$2.29M |
2025 Q3
4 quarters
|
|
1508
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$717M
| $3.28M | ﹤0.01% |
49,900
+600
| +1% | +$33.5K |
2015 Q3
44 quarters
|
|
1509
CALL
Dave Inc
DAVE
$3.61B
| $3.28M | ﹤0.01% |
10,200
+600
| +6% | +$222K |
2024 Q3
8 quarters
|
|
1510
CALL
Amylyx Pharmaceuticals
AMLX
$4.09B
| $3.27M | ﹤0.01% |
112,500
+18,400
| +20% | +$488K |
2022 Q1
18 quarters
|
|
1511
PUT
Novavax
NVAX
$1.65B
| $3.27M | ﹤0.01% |
302,400
+17,300
| +6% | +$155K |
2014 Q4
47 quarters
|
|
1512
CALL
BILL Holdings
BILL
$4.67B
| $3.27M | ﹤0.01% |
76,800
-39,600
| -34% | -$1.83M |
2020 Q1
26 quarters
|
|
1513
CALL
Coca-Cola Europacific Partners
CCEP
$51.7B
| $3.26M | ﹤0.01% |
32,100
+2,500
| +8% | +$265K |
2026 Q1
2 quarters
|
|
1514
PUT
Archer Daniels Midland
ADM
$33.8B
| $3.26M | ﹤0.01% |
41,100
+9,100
| +28% | +$746K |
2021 Q2
21 quarters
|
|
1515
CALL
CenterPoint Energy
CNP
$27.2B
| $3.26M | ﹤0.01% |
88,500
-200
| -0.2% | -$8.15K |
2014 Q4
47 quarters
|
|
1516
CALL
IQVIA
IQV
$45.2B
| $3.25M | ﹤0.01% |
12,100
+10,900
| +908% | +$2.63M |
2017 Q1
38 quarters
|
|
1517
CALL
Fervo Energy
FRVO
$3.81B
| $3.25M | ﹤0.01% |
239,200
+200,900
| +525% | +$4.07M |
2026 Q2
1 quarter
|
|
1518
Novo Nordisk
NVO
$181B
| $3.25M | ﹤0.01% |
+85,735
| New | +$3.95M |
2026 Q3
0 quarters
|
|
1519
CALL
Compass Pathways
CMPS
$1.32B
| $3.25M | ﹤0.01% |
261,100
-84,500
| -24% | -$1.12M |
2020 Q4
23 quarters
|
|
1520
CALL
American Bitcoin Corp
ABTC
$386M
| $3.24M | ﹤0.01% |
382,400
+353,993
| +1,246% | +$2.64M |
2025 Q3
4 quarters
|
|
1521
PUT
FTAI Aviation
FTAI
$19.5B
| $3.24M | ﹤0.01% |
19,400
+7,300
| +60% | +$1.49M |
2021 Q2
21 quarters
|
|
1522
CALL
Okeanis Eco Tankers
ECO
$3.35B
| $3.24M | ﹤0.01% |
40,000
+38,600
| +2,757% | +$2.52M |
2026 Q2
1 quarter
|
|
1523
PUT
Kinder Morgan
KMI
$70.4B
| $3.24M | ﹤0.01% |
107,300
-48,100
| -31% | -$1.52M |
2021 Q2
21 quarters
|
|
1524
Alibaba
BABA
$253B
| $3.22M | ﹤0.01% |
+29,985
| New | +$3.47M |
2026 Q3
0 quarters
|
|
1525
CALL
Raymond James Financial
RJF
$32.1B
| $3.22M | ﹤0.01% |
20,400
+2,400
| +13% | +$412K |
2015 Q4
43 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.