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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 | |
|---|---|---|---|---|---|---|---|
3451
PUT
Inspire Medical Systems
INSP
$1.75B
| $548K | ﹤0.01% |
7,900
+1,600
| +25% | +$95.6K |
2021 Q1
22 quarters
|
|
3452
Nextpower Inc. Common Stock
NXT
$14.1B
| $548K | ﹤0.01% |
+7,028
| New | +$659K |
2026 Q3
0 quarters
|
|
3453
CALL
Globe Life
GL
$12.1B
| $547K | ﹤0.01% |
3,300
+1,000
| +43% | +$176K |
2020 Q4
23 quarters
|
|
3454
California Resources
CRC
$4.23B
| $546K | ﹤0.01% |
+10,751
| New | +$569K |
2026 Q3
0 quarters
|
|
3455
Oric Pharmaceuticals
ORIC
$881M
| $546K | ﹤0.01% |
40,538
+33,432
| +470% | +$416K |
2025 Q4
3 quarters
|
|
3456
CALL
National Grid
NGG
$84.1B
| $546K | ﹤0.01% |
7,200
+4,900
| +213% | +$391K |
2015 Q2
45 quarters
|
|
3457
PUT
HEICO Corp Class A
HEI.A
$35.5B
| $546K | ﹤0.01% |
1,800
+200
| +13% | +$49.9K |
2022 Q3
16 quarters
|
|
3458
EHang Holdings
EH
$283M
| $545K | ﹤0.01% |
129,249
+34,535
| +36% | +$177K |
2021 Q4
19 quarters
|
|
3459
CALL
Haleon
HLN
$39.9B
| $545K | ﹤0.01% |
60,600
+60,300
| +20,100% | +$586K |
2022 Q3
16 quarters
|
|
3460
PUT
NetEase
NTES
$78.5B
| $545K | ﹤0.01% |
4,500
-12,700
| -74% | -$1.58M |
2014 Q4
47 quarters
|
|
3461
NEOS Bitcoin High Income ETF
BTCI
$1.23B
| $545K | ﹤0.01% |
16,150
-5,559
| -26% | -$169K |
2025 Q3
4 quarters
|
|
3462
Mondelez International
MDLZ
$84.3B
| $545K | ﹤0.01% |
9,423
-4,437
| -32% | -$273K |
2025 Q2
5 quarters
|
|
3463
PUT
Doximity
DOCS
$5.92B
| $544K | ﹤0.01% |
19,200
-37,900
| -66% | -$915K |
2021 Q4
19 quarters
|
|
3464
CALL
Power Solutions International
PSIX
$909M
| $542K | ﹤0.01% |
11,800
+400
| +4% | +$14.9K |
2025 Q3
4 quarters
|
|
3465
PUT
La-Z-Boy
LZB
$1.3B
| $542K | ﹤0.01% |
+18,300
| New | +$659K |
2026 Q3
0 quarters
|
|
3466
Rezolute
RZLT
$374M
| $541K | ﹤0.01% |
130,753
+29,510
| +29% | +$136K |
2026 Q1
2 quarters
|
|
3467
PUT
Halozyme
HALO
$11.5B
| $541K | ﹤0.01% |
4,900
-100
| -2% | -$9.7K |
2021 Q2
21 quarters
|
|
3468
PUT
Trulieve Cannabis Corp
TRLV
$1.9B
| $541K | ﹤0.01% |
49,600
+47,300
| +2,057% | +$481K |
2026 Q2
1 quarter
|
|
3469
CALL
ICICI Bank
IBN
$123B
| $540K | ﹤0.01% |
19,600
+5,700
| +41% | +$168K |
2021 Q2
21 quarters
|
|
3470
CALL
EverQuote
EVER
$989M
| $540K | ﹤0.01% |
26,900
-23,400
| -47% | -$569K |
2023 Q4
11 quarters
|
|
3471
CALL
Village Farms International
VFF
$311M
| $539K | ﹤0.01% |
185,300
+71,200
| +62% | +$176K |
2025 Q2
5 quarters
|
|
3472
Celcuity
CELC
$3.14B
| $539K | ﹤0.01% |
6,777
+2,184
| +48% | +$199K |
2026 Q2
1 quarter
|
|
3473
CALL
Inovio Pharmaceuticals
INO
$262M
| $539K | ﹤0.01% |
441,700
-29,700
| -6% | -$33.1K |
2021 Q2
21 quarters
|
|
3474
PUT
Ambiq Micro
AMBQ
$1.21B
| $539K | ﹤0.01% |
7,900
+5,800
| +276% | +$391K |
2026 Q2
1 quarter
|
|
3475
PUT
Sociedad Química y Minera de Chile
SQM
$15.4B
| $538K | ﹤0.01% |
8,300
+5,400
| +186% | +$390K |
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.