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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 | |
|---|---|---|---|---|---|---|---|
5026
CALL
Oshkosh
OSK
$8.64B
| $142K | ﹤0.01% |
1,100
-24,700
| -96% | -$3.65M |
2015 Q3
44 quarters
|
|
5027
PUT
FLEX LNG
FLNG
$1.4B
| $141K | ﹤0.01% |
4,600
-9,400
| -67% | -$291K |
2022 Q1
18 quarters
|
|
5028
CALL
Anterix
ATEX
$1.63B
| $141K | ﹤0.01% |
1,800
+300
| +20% | +$27.6K |
2026 Q1
2 quarters
|
|
5029
CALL
Tradeweb Markets
TW
$27.8B
| $141K | ﹤0.01% |
1,400
-3,900
| -74% | -$401K |
2019 Q2
29 quarters
|
|
5030
Resideo Technologies
REZI
$3.24B
| $141K | ﹤0.01% |
+7,774
| New | +$198K |
2026 Q3
0 quarters
|
|
5031
Moelis & Co
MC
$4.14B
| $141K | ﹤0.01% |
2,451
-1,429
| -37% | -$93.9K |
2025 Q3
4 quarters
|
|
5032
PUT
Candel Therapeutics
CADL
$642M
| $141K | ﹤0.01% |
13,500
+3,500
| +35% | +$38.8K |
2024 Q2
9 quarters
|
|
5033
Qfin Holdings
QFIN
$646M
| $141K | ﹤0.01% |
+21,011
| New | +$236K |
2026 Q3
0 quarters
|
|
5034
PUT
Tron Inc
TRON
$669M
| $141K | ﹤0.01% |
99,100
-4,000
| -4% | -$6.27K |
2025 Q2
5 quarters
|
|
5035
CALL
Miami International Holdings
MIAX
$3.61B
| $141K | ﹤0.01% |
4,200
-500
| -11% | -$20.9K |
2025 Q3
4 quarters
|
|
5036
FuboTV Inc
FUBO
$232M
| $140K | ﹤0.01% |
15,671
+4,056
| +35% | +$40.4K |
2024 Q4
7 quarters
|
|
5037
PUT
AppFolio
APPF
$7.9B
| $140K | ﹤0.01% |
700
+500
| +250% | +$99.2K |
2026 Q2
1 quarter
|
|
5038
CALL
Agree Realty
ADC
$8.99B
| $140K | ﹤0.01% |
2,100
-4,100
| -66% | -$305K |
2021 Q2
21 quarters
|
|
5039
CALL
Invivyd
IVVD
$167M
| $140K | ﹤0.01% |
161,100
+38,400
| +31% | +$30.4K |
2025 Q1
6 quarters
|
|
5040
iShares MSCI Global Metals & Mining Producers ETF
PICK
$2.14B
| $140K | ﹤0.01% |
2,337
+2,000
| +593% | +$123K |
2025 Q4
3 quarters
|
|
5041
Forward Air
FWRD
$579M
| $140K | ﹤0.01% |
9,183
-3,087
| -25% | -$48.9K |
2025 Q2
5 quarters
|
|
5042
Knowles
KN
$2.88B
| $140K | ﹤0.01% |
3,765
-3,459
| -48% | -$126K |
2026 Q2
1 quarter
|
|
5043
PUT
Cemex
CX
$15.1B
| $140K | ﹤0.01% |
14,700
-9,600
| -40% | -$108K |
2021 Q1
22 quarters
|
|
5044
CALL
BTQ Technologies Corp
BTQ
$223M
| $140K | ﹤0.01% |
48,200
+3,700
| +8% | +$12.7K |
2025 Q4
3 quarters
|
|
5045
PUT
Park Aerospace
PKE
$536M
| $140K | ﹤0.01% |
+4,700
| New | +$158K |
2026 Q3
0 quarters
|
|
5046
Axcelis
ACLS
$3.34B
| $139K | ﹤0.01% |
1,063
-459
| -30% | -$58.7K |
2025 Q2
5 quarters
|
|
5047
Arxis Inc
ARXS
$23.2B
| $139K | ﹤0.01% |
2,819
-16,408
| -85% | -$822K |
2026 Q2
1 quarter
|
|
5048
CALL
Tootsie Roll Industries
TR
$2.86B
| $139K | ﹤0.01% |
3,700
| – | – |
2026 Q2
1 quarter
|
|
5049
Acumen Pharmaceuticals
ABOS
$15.8M
| $139K | ﹤0.01% |
+62,600
| New | +$162K |
2026 Q3
0 quarters
|
|
5050
CALL
Tilly's
TLYS
$129M
| $139K | ﹤0.01% |
30,000
-400
| -1% | -$1.64K |
2026 Q1
2 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.