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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 | |
|---|---|---|---|---|---|---|---|
2301
CALL
Mattel
MAT
$4.59B
| $1.5M | ﹤0.01% |
118,600
+12,600
| +12% | +$179K |
2014 Q4
47 quarters
|
|
2302
XPeng
XPEV
$9.42B
| $1.5M | ﹤0.01% |
156,930
-119,460
| -43% | -$1.41M |
2025 Q2
5 quarters
|
|
2303
PUT
Blue Owl Capital
OBDC
$5.47B
| $1.5M | ﹤0.01% |
143,000
-52,200
| -27% | -$580K |
2026 Q1
2 quarters
|
|
2304
CALL
GigaCloud Technology
GCT
$2.3B
| $1.5M | ﹤0.01% |
29,000
+6,000
| +26% | +$278K |
2023 Q4
11 quarters
|
|
2305
PUT
Canadian Solar
CSIQ
$691M
| $1.5M | ﹤0.01% |
130,000
+42,600
| +49% | +$595K |
2021 Q2
21 quarters
|
|
2306
PUT
Erasca
ERAS
$5.88B
| $1.5M | ﹤0.01% |
102,100
-31,600
| -24% | -$553K |
2025 Q3
4 quarters
|
|
2307
Solventum
SOLV
$15.1B
| $1.49M | ﹤0.01% |
16,942
+4,180
| +33% | +$358K |
2026 Q2
1 quarter
|
|
2308
CALL
SouthState Bank Corp
SSB
$10.2B
| $1.49M | ﹤0.01% |
15,000
+14,000
| +1,400% | +$1.47M |
2026 Q2
1 quarter
|
|
2309
CALL
Otis Worldwide
OTIS
$29.5B
| $1.49M | ﹤0.01% |
23,100
-8,200
| -26% | -$583K |
2020 Q2
25 quarters
|
|
2310
PUT
Alkami Technology
ALKT
$1.51B
| $1.48M | ﹤0.01% |
108,300
-51,000
| -32% | -$943K |
2026 Q1
2 quarters
|
|
2311
Arthur J. Gallagher & Co
AJG
$72.3B
| $1.48M | ﹤0.01% |
6,497
+2,272
| +54% | +$570K |
2026 Q2
1 quarter
|
|
2312
CALL
Draganfly
DPRO
$117M
| $1.48M | ﹤0.01% |
243,500
+38,800
| +19% | +$190K |
2025 Q3
4 quarters
|
|
2313
PUT
Sweetgreen
SG
$1.54B
| $1.48M | ﹤0.01% |
166,700
-108,000
| -39% | -$747K |
2021 Q4
19 quarters
|
|
2314
PUT
T. Rowe Price
TROW
$23.6B
| $1.48M | ﹤0.01% |
14,200
-9,800
| -41% | -$1.1M |
2018 Q1
34 quarters
|
|
2315
CALL
Smurfit Westrock
SW
$23.1B
| $1.48M | ﹤0.01% |
33,500
-117,000
| -78% | -$5.4M |
2024 Q3
8 quarters
|
|
2316
PUT
Knight Transportation
KNX
$10.2B
| $1.48M | ﹤0.01% |
23,200
-89,300
| -79% | -$6.3M |
2026 Q1
2 quarters
|
|
2317
PUT
Molina Healthcare
MOH
$10.9B
| $1.47M | ﹤0.01% |
7,800
-3,000
| -28% | -$619K |
2017 Q4
35 quarters
|
|
2318
Amcor
AMCR
$20.5B
| $1.47M | ﹤0.01% |
35,184
+9,750
| +38% | +$436K |
2026 Q2
1 quarter
|
|
2319
C3.ai
AI
$1.96B
| $1.47M | ﹤0.01% |
133,610
+70,423
| +111% | +$695K |
2026 Q1
2 quarters
|
|
2320
PUT
Papa John's
PZZA
$632M
| $1.47M | ﹤0.01% |
74,500
+4,200
| +6% | +$110K |
2015 Q3
44 quarters
|
|
2321
Ormat Technologies
ORA
$5.73B
| $1.47M | ﹤0.01% |
16,029
-1,080
| -6% | -$112K |
2025 Q4
3 quarters
|
|
2322
Navios Maritime Partners
NMM
$2.55B
| $1.47M | ﹤0.01% |
16,305
+13,045
| +400% | +$1.08M |
2026 Q1
2 quarters
|
|
2323
SGHC Ltd
SGHC
$5.93B
| $1.46M | ﹤0.01% |
128,990
-69,080
| -35% | -$947K |
2026 Q2
1 quarter
|
|
2324
PUT
TORM
TRMD
$3.63B
| $1.46M | ﹤0.01% |
38,400
+15,200
| +66% | +$480K |
2022 Q3
16 quarters
|
|
2325
CALL
Zions Bancorporation
ZION
$9.6B
| $1.46M | ﹤0.01% |
23,300
-63,200
| -73% | -$4.34M |
2015 Q2
45 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.