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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 | |
|---|---|---|---|---|---|---|---|
476
PUT
Vale
VALE
$49.3B
| $19.2M | 0.01% |
1,434,700
+76,600
| +6% | +$1.12M |
2018 Q1
34 quarters
|
|
477
CALL
Vanguard Consumer Discretionary ETF
VCR
$6.21B
| $19.2M | 0.01% |
152,200
+77,300
| +103% | +$29.9M |
2018 Q2
33 quarters
|
|
478
PUT
Nucor
NUE
$59.3B
| $19.1M | 0.01% |
81,700
+13,200
| +19% | +$3.3M |
2014 Q4
47 quarters
|
|
479
TSMC
TSM
$2.14T
| $19.1M | 0.01% |
41,859
-105,548
| -72% | -$44.7M |
2026 Q1
2 quarters
|
|
480
iShares MSCI Brazil ETF
EWZ
$9.38B
| $19M | 0.01% |
+510,468
| New | +$18.4M |
2026 Q3
0 quarters
|
|
481
CALL
Workday
WDAY
$46.1B
| $19M | 0.01% |
99,800
-42,700
| -30% | -$7.44M |
2021 Q1
22 quarters
|
|
482
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$415M
| $18.8M | 0.01% |
323,200
+193,900
| +150% | +$11.2M |
2026 Q1
2 quarters
|
|
483
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$96.5M
| $18.8M | 0.01% |
641,300
+456,200
| +246% | +$42.3M |
2020 Q4
23 quarters
|
|
484
PUT
Philip Morris
PM
$306B
| $18.7M | 0.01% |
98,200
-80,200
| -45% | -$15.2M |
2014 Q4
47 quarters
|
|
485
CALL
First Majestic Silver
AG
$7.28B
| $18.6M | 0.01% |
1,052,600
-305,000
| -22% | -$5.62M |
2021 Q1
22 quarters
|
|
486
PUT
Booking.com
BKNG
$119B
| $18.6M | 0.01% |
114,100
+20,900
| +22% | +$3.93M |
2021 Q2
21 quarters
|
|
487
CALL
Wynn Resorts
WYNN
$8.79B
| $18.5M | 0.01% |
232,800
-15,400
| -6% | -$1.45M |
2014 Q4
47 quarters
|
|
488
PUT
Williams Companies
WMB
$86.2B
| $18.5M | 0.01% |
271,800
+125,500
| +86% | +$9.13M |
2019 Q1
30 quarters
|
|
489
CALL
CSX Corp
CSX
$95.7B
| $18.3M | 0.01% |
394,500
+144,500
| +58% | +$7.16M |
2021 Q2
21 quarters
|
|
490
CALL
Atlassian
TEAM
$38.6B
| $18.3M | 0.01% |
102,100
+12,000
| +13% | +$1.73M |
2021 Q2
21 quarters
|
|
491
PUT
Petrobras
PBR
$115B
| $18.3M | 0.01% |
881,300
+208,000
| +31% | +$3.95M |
2026 Q1
2 quarters
|
|
492
CALL
Plains All American Pipeline
PAA
$17.1B
| $18.2M | 0.01% |
768,600
+442,200
| +135% | +$10.8M |
2015 Q3
44 quarters
|
|
493
CALL
STMicroelectronics
STM
$41.3B
| $18.2M | 0.01% |
341,600
+58,400
| +21% | +$3.24M |
2016 Q3
40 quarters
|
|
494
PUT
Tempus AI
TEM
$14.5B
| $18.1M | 0.01% |
221,400
-31,100
| -12% | -$1.88M |
2024 Q2
9 quarters
|
|
495
CALL
Halliburton
HAL
$27.2B
| $18.1M | 0.01% |
570,200
-68,400
| -11% | -$2.33M |
2015 Q1
46 quarters
|
|
496
PUT
Applied Digital
APLD
$5.42B
| $18.1M | 0.01% |
743,200
+88,800
| +14% | +$2.49M |
2023 Q2
13 quarters
|
|
497
PUT
Altria Group
MO
$129B
| $18.1M | 0.01% |
268,500
-191,100
| -42% | -$13.3M |
2014 Q4
47 quarters
|
|
498
PUT
Celestica
CLS
$30.6B
| $18.1M | 0.01% |
50,000
+7,400
| +17% | +$2.45M |
2022 Q4
15 quarters
|
|
499
CALL
Diamondback Energy
FANG
$50.5B
| $18.1M | 0.01% |
98,200
+59,600
| +154% | +$11.7M |
2015 Q3
44 quarters
|
|
500
CALL
Roblox
RBLX
$37.7B
| $17.9M | 0.01% |
423,100
-176,400
| -29% | -$8M |
2021 Q1
22 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.