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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 | |
|---|---|---|---|---|---|---|---|
501
CALL
Toronto Dominion Bank
TD
$203B
| $17.9M | 0.01% |
152,100
-67,300
| -31% | -$8.13M |
2016 Q1
42 quarters
|
|
502
CALL
Stanley Black & Decker
SWK
$17.2B
| $17.9M | 0.01% |
201,500
+1,200
| +0.6% | +$113K |
2014 Q4
47 quarters
|
|
503
CALL
APA Corp
APA
$15.7B
| $17.8M | 0.01% |
428,000
+150,100
| +54% | +$5.96M |
2021 Q2
21 quarters
|
|
504
CALL
Medtronic
MDT
$130B
| $17.7M | 0.01% |
204,900
+32,800
| +19% | +$2.89M |
2014 Q4
47 quarters
|
|
505
PUT
Dow Inc
DOW
$23.6B
| $17.6M | 0.01% |
637,800
-52,900
| -8% | -$1.57M |
2019 Q2
29 quarters
|
|
506
CALL
Knight Transportation
KNX
$10.2B
| $17.6M | 0.01% |
276,100
+219,700
| +390% | +$15.5M |
2026 Q1
2 quarters
|
|
507
CALL
Bio-Techne
TECH
$11.4B
| $17.6M | 0.01% |
242,200
+182,700
| +307% | +$13.2M |
2023 Q1
14 quarters
|
|
508
AST SpaceMobile
ASTS
$11B
| $17.5M | 0.01% |
297,805
+188,934
| +174% | +$12.2M |
2023 Q3
12 quarters
|
|
509
CALL
Trade Desk
TTD
$7.56B
| $17.5M | 0.01% |
1,438,700
+496,900
| +53% | +$7.8M |
2017 Q2
37 quarters
|
|
510
CALL
iShares iBonds 2030 Term High Yield and Income ETF
IBHJ
$202M
| $17.5M | 0.01% |
178,100
+31,500
| +21% | +$826K |
2024 Q3
8 quarters
|
|
511
PUT
Take-Two Interactive
TTWO
$43.3B
| $17.4M | 0.01% |
84,000
-21,800
| -21% | -$5.04M |
2026 Q1
2 quarters
|
|
512
CALL
Everpure Inc
P
$35.5B
| $17.4M | 0.01% |
133,000
+35,500
| +36% | +$3.34M |
2017 Q4
35 quarters
|
|
513
CALL
Edison International
EIX
$23.1B
| $17.3M | 0.01% |
322,600
+251,700
| +355% | +$17M |
2017 Q4
35 quarters
|
|
514
CALL
Applied Digital
APLD
$5.42B
| $17.3M | 0.01% |
710,700
+173,600
| +32% | +$4.87M |
2023 Q2
13 quarters
|
|
515
PUT
Ulta Beauty
ULTA
$28.2B
| $17.3M | 0.01% |
31,700
-2,000
| -6% | -$1.04M |
2021 Q2
21 quarters
|
|
516
PUT
Beyond Meat
BYND
$108M
| $17.3M | 0.01% |
2,091,500
+2,029,160
| +3,255% | +$29.6M |
2021 Q1
22 quarters
|
|
|
517
United States Oil Fund
USO
$1.8B
| $17.2M | 0.01% |
118,399
-372,338
| -76% | -$49.2M |
2026 Q1
2 quarters
|
|
518
PUT
MP Materials
MP
$6.55B
| $17.2M | 0.01% |
364,500
+169,500
| +87% | +$8.6M |
2020 Q3
24 quarters
|
|
519
CALL
Constellation Brands
STZ
$24.4B
| $17.1M | 0.01% |
151,200
+56,700
| +60% | +$7.31M |
2021 Q3
20 quarters
|
|
520
PUT
Affirm
AFRM
$23B
| $16.9M | 0.01% |
243,600
+34,500
| +16% | +$2.59M |
2021 Q1
22 quarters
|
|
521
CALL
SELLAS Life Sciences
SLS
$1.7B
| $16.8M | 0.01% |
1,367,400
+197,600
| +17% | +$2.48M |
2026 Q1
2 quarters
|
|
522
CALL
EQT Corp
EQT
$33B
| $16.8M | 0.01% |
346,600
+135,600
| +64% | +$7.1M |
2016 Q2
41 quarters
|
|
523
Marvell Technology
MRVL
$152B
| $16.8M | 0.01% |
63,598
-31,070
| -33% | -$6.97M |
2025 Q2
5 quarters
|
|
524
PUT
Southern Company
SO
$109B
| $16.8M | 0.01% |
202,500
+16,500
| +9% | +$1.5M |
2014 Q4
47 quarters
|
|
525
CALL
Emerson Electric
EMR
$93.2B
| $16.8M | 0.01% |
108,200
+34,200
| +46% | +$5.15M |
2014 Q4
47 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.