We are live on !
Find out more
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 | |
|---|---|---|---|---|---|---|---|
3476
Applied Aerospace & Defense Inc
AADX
$1.46B
| $538K | ﹤0.01% |
44,744
+36,608
| +450% | +$604K |
2026 Q2
1 quarter
|
|
3477
CALL
Defi Technologies
DEFT
$131M
| $538K | ﹤0.01% |
1,087,400
+273,200
| +34% | +$139K |
2025 Q3
4 quarters
|
|
3478
Pampa Energía
PAM
$3.42B
| $538K | ﹤0.01% |
+6,915
| New | +$572K |
2026 Q3
0 quarters
|
|
3479
Aris Mining
ARIS
$3.07B
| $537K | ﹤0.01% |
30,849
+27,188
| +743% | +$470K |
2026 Q2
1 quarter
|
|
3480
Newmark Group
NMRK
$1.91B
| $537K | ﹤0.01% |
43,773
+27,813
| +174% | +$415K |
2025 Q1
6 quarters
|
|
3481
CALL
Vermilion Energy
VET
$1.65B
| $536K | ﹤0.01% |
47,100
+1,100
| +2% | +$12.6K |
2018 Q2
33 quarters
|
|
3482
Securitize Corp
SECZ
$1.33B
| $536K | ﹤0.01% |
+36,708
| New | +$307K |
2026 Q3
0 quarters
|
|
3483
CALL
Viper Energy
VNOM
$8.11B
| $535K | ﹤0.01% |
13,400
-22,300
| -62% | -$963K |
2017 Q3
36 quarters
|
|
3484
Ollie's Bargain Outlet
OLLI
$5.59B
| $534K | ﹤0.01% |
+6,237
| New | +$462K |
2026 Q3
0 quarters
|
|
3485
PUT
Cantor Equity Partners I
CEPO
$276M
| $534K | ﹤0.01% |
49,600
+41,600
| +520% | +$445K |
2026 Q1
2 quarters
|
|
3486
PUT
Somnigroup International
SGI
$14B
| $534K | ﹤0.01% |
8,600
-7,100
| -45% | -$481K |
2026 Q1
2 quarters
|
|
3487
CALL
TPG
TPG
$8.64B
| $534K | ﹤0.01% |
12,100
+5,700
| +89% | +$269K |
2022 Q1
18 quarters
|
|
3488
PUT
Aurora Cannabis
ACB
$321M
| $534K | ﹤0.01% |
136,800
+86,100
| +170% | +$293K |
2018 Q4
31 quarters
|
|
3489
Global X Copper Miners ETF NEW
COPX
$5.81B
| $533K | ﹤0.01% |
6,297
-37,827
| -86% | -$3.2M |
2026 Q1
2 quarters
|
|
3490
Alignment Healthcare
ALHC
$1.53B
| $533K | ﹤0.01% |
65,302
+64,168
| +5,659% | +$958K |
2026 Q1
2 quarters
|
|
3491
CALL
Medifast
MED
$143M
| $532K | ﹤0.01% |
46,200
-59,200
| -56% | -$675K |
2021 Q4
19 quarters
|
|
3492
CALL
Huntsman Corp
HUN
$1.65B
| $532K | ﹤0.01% |
63,300
-6,500
| -9% | -$66.9K |
2014 Q4
47 quarters
|
|
3493
Diageo
DEO
$56.4B
| $531K | ﹤0.01% |
6,208
-10,222
| -62% | -$900K |
2024 Q4
7 quarters
|
|
3494
PUT
Perrigo
PRGO
$2.27B
| $531K | ﹤0.01% |
36,000
+16,000
| +80% | +$202K |
2015 Q1
46 quarters
|
|
3495
BorgWarner
BWA
$10.2B
| $531K | ﹤0.01% |
+8,839
| New | +$570K |
2026 Q3
0 quarters
|
|
3496
TKO Group
TKO
$14.2B
| $531K | ﹤0.01% |
+2,956
| New | +$557K |
2026 Q3
0 quarters
|
|
3497
CALL
Charles River Laboratories
CRL
$16.1B
| $531K | ﹤0.01% |
1,800
-400
| -18% | -$105K |
2018 Q1
34 quarters
|
|
3498
CALL
Avery Dennison
AVY
$14.2B
| $529K | ﹤0.01% |
3,100
+3,000
| +3,000% | +$511K |
2026 Q2
1 quarter
|
|
3499
Netskope Inc
NTSK
$8.72B
| $529K | ﹤0.01% |
+30,312
| New | +$440K |
2026 Q3
0 quarters
|
|
3500
PUT
Altimmune
ALT
$317M
| $529K | ﹤0.01% |
184,800
+139,100
| +304% | +$427K |
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.