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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 | |
|---|---|---|---|---|---|---|---|
4076
PUT
Sphere Entertainment
SPHR
$4.55B
| $323K | ﹤0.01% |
2,400
-24,700
| -91% | -$3.67M |
2021 Q1
22 quarters
|
|
4077
PUT
Elanco Animal Health
ELAN
$13.3B
| $322K | ﹤0.01% |
14,400
+300
| +2% | +$7.24K |
2020 Q1
26 quarters
|
|
4078
CALL
NRX Pharmaceuticals
NRXP
$96.5M
| $322K | ﹤0.01% |
110,400
-207,400
| -65% | -$737K |
2025 Q1
6 quarters
|
|
4079
Direxion Daily Regional Banks Bull 3X ETF
DPST
$313M
| $322K | ﹤0.01% |
2,942
+10
| +0.3% | +$1.38K |
2025 Q4
3 quarters
|
|
4080
PUT
Bitwise Solana Staking ETF
BSOL
$651M
| $321K | ﹤0.01% |
19,900
-600
| -3% | -$7.36K |
2025 Q4
3 quarters
|
|
4081
PUT
CBRE Group
CBRE
$38.4B
| $321K | ﹤0.01% |
2,500
-5,400
| -68% | -$774K |
2017 Q1
38 quarters
|
|
4082
PUT
Canadian National Railway
CNI
$76.5B
| $321K | ﹤0.01% |
2,700
+1,300
| +93% | +$162K |
2018 Q1
34 quarters
|
|
4083
Vistance Networks Inc
VISN
$829M
| $321K | ﹤0.01% |
53,657
-93,334
| -63% | -$918K |
2025 Q1
6 quarters
|
|
4084
Bumble
BMBL
$929M
| $321K | ﹤0.01% |
121,972
+60,509
| +98% | +$174K |
2023 Q2
13 quarters
|
|
4085
CALL
Beta Bionics
BBNX
$892M
| $321K | ﹤0.01% |
16,900
+8,000
| +90% | +$144K |
2025 Q4
3 quarters
|
|
4086
PUT
Pony AI Inc
PONY
$1.91B
| $320K | ﹤0.01% |
49,000
-6,700
| -12% | -$48.8K |
2025 Q2
5 quarters
|
|
4087
CALL
Eightco Holdings
ORBS
$279M
| $320K | ﹤0.01% |
273,700
-520,200
| -66% | -$414K |
2025 Q4
3 quarters
|
|
4088
CALL
The Magnum Ice Cream Company N.V.
MICC
$12B
| $320K | ﹤0.01% |
18,000
+17,900
| +17,900% | +$341K |
2026 Q1
2 quarters
|
|
4089
PTC Therapeutics
PTCT
$5.25B
| $319K | ﹤0.01% |
+4,930
| New | +$359K |
2026 Q3
0 quarters
|
|
4090
DraftKings
DKNG
$9.46B
| $319K | ﹤0.01% |
+16,790
| New | +$405K |
2026 Q3
0 quarters
|
|
4091
Kodiak Gas Services
KGS
$4.51B
| $319K | ﹤0.01% |
6,013
-5,374
| -47% | -$328K |
2025 Q4
3 quarters
|
|
4092
CALL
Apple Hospitality REIT
APLE
$4.6B
| $318K | ﹤0.01% |
19,700
+8,800
| +81% | +$143K |
2018 Q2
33 quarters
|
|
4093
Bright Horizons
BFAM
$2.55B
| $318K | ﹤0.01% |
+4,991
| New | +$360K |
2026 Q3
0 quarters
|
|
4094
CALL
Franklin Templeton
BEN
$18.4B
| $318K | ﹤0.01% |
9,900
-2,700
| -21% | -$90.7K |
2016 Q2
41 quarters
|
|
4095
Vanguard Total International Stock ETF
VXUS
$161B
| $318K | ﹤0.01% |
3,741
-12,228
| -77% | -$1.05M |
2026 Q2
1 quarter
|
|
4096
News Corp Class A
NWSA
$14.4B
| $318K | ﹤0.01% |
11,093
+7,371
| +198% | +$213K |
2025 Q4
3 quarters
|
|
|
4097
CALL
PTC Therapeutics
PTCT
$5.25B
| $317K | ﹤0.01% |
4,900
-29,700
| -86% | -$2.16M |
2024 Q4
7 quarters
|
|
4098
PUT
United States Antimony
UAMY
$449M
| $317K | ﹤0.01% |
76,100
+4,400
| +6% | +$24K |
2024 Q4
7 quarters
|
|
4099
CALL
Palvella Therapeutics
PVLA
$2.2B
| $317K | ﹤0.01% |
+2,300
| New | +$341K |
2026 Q3
0 quarters
|
|
4100
CALL
Aclaris Therapeutics
ACRS
$619M
| $317K | ﹤0.01% |
60,300
+40,100
| +199% | +$229K |
2020 Q4
23 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.