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 | |
|---|---|---|---|---|---|---|---|
3276
PUT
Trekor Metals
TGB
$2.56B
| $632K | ﹤0.01% |
70,900
+11,100
| +19% | +$89.7K |
2024 Q2
9 quarters
|
|
3277
CALL
Sun Communities
SUI
$14B
| $631K | ﹤0.01% |
+5,700
| New | +$681K |
2026 Q3
0 quarters
|
|
3278
PUT
Citizens
CIA
$186M
| $630K | ﹤0.01% |
182,600
+144,400
| +378% | +$627K |
2026 Q2
1 quarter
|
|
3279
PUT
Fiverr
FVRR
$286M
| $629K | ﹤0.01% |
73,000
+65,300
| +848% | +$630K |
2020 Q1
26 quarters
|
|
3280
CALL
Broadridge
BR
$21.7B
| $628K | ﹤0.01% |
3,900
+1,400
| +56% | +$229K |
2026 Q1
2 quarters
|
|
3281
Redwire
RDW
$2.01B
| $628K | ﹤0.01% |
60,170
-151,963
| -72% | -$1.64M |
2026 Q1
2 quarters
|
|
3282
PUT
Itaú Unibanco
ITUB
$81.2B
| $626K | ﹤0.01% |
73,400
+9,400
| +15% | +$75.8K |
2016 Q1
42 quarters
|
|
3283
PUT
Gentherm
THRM
$1.57B
| $626K | ﹤0.01% |
+18,800
| New | +$728K |
2026 Q3
0 quarters
|
|
3284
Graphic Packaging
GPK
$3.19B
| $625K | ﹤0.01% |
69,039
+48,888
| +243% | +$523K |
2025 Q3
4 quarters
|
|
3285
CALL
Biomea Fusion
BMEA
$40.9M
| $625K | ﹤0.01% |
469,700
-23,800
| -5% | -$34.8K |
2022 Q4
15 quarters
|
|
3286
CALL
Cypherpunk Technologies Inc
CYPH
$210M
| $624K | ﹤0.01% |
187,300
+6,600
| +4% | +$10.1K |
2024 Q4
7 quarters
|
|
3287
CALL
Omeros
OMER
$1.3B
| $623K | ﹤0.01% |
32,700
-53,100
| -62% | -$804K |
2014 Q4
47 quarters
|
|
3288
CALL
Triple Flag Precious Metals
TFPM
$6.27B
| $622K | ﹤0.01% |
20,200
+13,000
| +181% | +$407K |
2024 Q2
9 quarters
|
|
3289
CALL
Performance Food Group
PFGC
$17.3B
| $622K | ﹤0.01% |
6,800
-13,100
| -66% | -$1.37M |
2020 Q1
26 quarters
|
|
3290
PUT
Green Brick Partners
GRBK
$2.59B
| $621K | ﹤0.01% |
9,400
+9,300
| +9,300% | +$661K |
2020 Q3
24 quarters
|
|
3291
CALL
Climb Bio
CLYM
$638M
| $621K | ﹤0.01% |
+54,100
| New | +$754K |
2026 Q3
0 quarters
|
|
3292
CALL
Equitable Holdings
EQH
$14.8B
| $620K | ﹤0.01% |
12,100
+11,000
| +1,000% | +$553K |
2018 Q2
33 quarters
|
|
3293
PUT
Build-A-Bear
BBW
$350M
| $619K | ﹤0.01% |
24,700
+22,800
| +1,200% | +$733K |
2019 Q2
29 quarters
|
|
3294
Quantinuum Inc
QNT
$1.71B
| $618K | ﹤0.01% |
+12,869
| New | +$729K |
2026 Q3
0 quarters
|
|
3295
PUT
GDS Holdings
GDS
$4.02B
| $618K | ﹤0.01% |
19,800
+14,400
| +267% | +$464K |
2017 Q4
35 quarters
|
|
3296
PUT
Vishay Precision Group
VPG
$705M
| $618K | ﹤0.01% |
8,500
+7,800
| +1,114% | +$633K |
2026 Q2
1 quarter
|
|
3297
PUT
Gold.com Inc
GOLD
$1.06B
| $617K | ﹤0.01% |
14,500
+11,900
| +458% | +$515K |
2022 Q1
18 quarters
|
|
3298
StoneCo
STNE
$1.78B
| $617K | ﹤0.01% |
+66,026
| New | +$679K |
2026 Q3
0 quarters
|
|
3299
PUT
Sagimet Biosciences
SGMT
$775M
| $617K | ﹤0.01% |
62,400
+16,700
| +37% | +$153K |
2024 Q2
9 quarters
|
|
3300
PUT
HIVE Digital Technologies
HIVE
$457M
| $616K | ﹤0.01% |
208,700
-25,600
| -11% | -$77.2K |
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.