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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 | |
|---|---|---|---|---|---|---|---|
1326
CVS Health
CVS
$115B
| $4.11M | ﹤0.01% |
47,919
+28,512
| +147% | +$2.79M |
2025 Q3
4 quarters
|
|
1327
PUT
Exelixis
EXEL
$17.3B
| $4.1M | ﹤0.01% |
70,200
+60,700
| +639% | +$3.38M |
2021 Q2
21 quarters
|
|
1328
CALL
WESCO International
WCC
$15.9B
| $4.1M | ﹤0.01% |
11,400
+11,000
| +2,750% | +$3.79M |
2018 Q2
33 quarters
|
|
1329
BHP
BHP
$209B
| $4.09M | ﹤0.01% |
+48,232
| New | +$4.2M |
2026 Q3
0 quarters
|
|
1330
CALL
Tenet Healthcare
THC
$23.3B
| $4.09M | ﹤0.01% |
16,000
+1,300
| +9% | +$320K |
2021 Q2
21 quarters
|
|
1331
PUT
Boston Properties
BXP
$10.1B
| $4.08M | ﹤0.01% |
66,800
+15,400
| +30% | +$1.04M |
2018 Q2
33 quarters
|
|
1332
PUT
Sterling Infrastructure
STRL
$9.27B
| $4.08M | ﹤0.01% |
8,300
+5,800
| +232% | +$3.26M |
2023 Q1
14 quarters
|
|
1333
CALL
Aehr Test Systems
AEHR
$2.16B
| $4.07M | ﹤0.01% |
40,900
+16,300
| +66% | +$1.49M |
2021 Q4
19 quarters
|
|
1334
PUT
Public Storage
PSA
$62.7B
| $4.07M | ﹤0.01% |
14,400
-19,200
| -57% | -$6.01M |
2014 Q4
47 quarters
|
|
1335
CALL
Antero Midstream
AM
$9.46B
| $4.07M | ﹤0.01% |
201,900
+61,700
| +44% | +$1.36M |
2018 Q3
32 quarters
|
|
1336
PUT
Align Technology
ALGN
$12.1B
| $4.07M | ﹤0.01% |
28,000
| – | – |
2021 Q2
21 quarters
|
|
1337
Navitas Semiconductor
NVTS
$2.71B
| $4.06M | ﹤0.01% |
+350,122
| New | +$4.32M |
2026 Q3
0 quarters
|
|
1338
PUT
Nextpower Inc. Common Stock
NXT
$15.1B
| $4.04M | ﹤0.01% |
51,900
+26,700
| +106% | +$2.5M |
2023 Q1
14 quarters
|
|
1339
PUT
Nutanix
NTNX
$16.4B
| $4.01M | ﹤0.01% |
56,900
+32,400
| +132% | +$2.03M |
2016 Q4
39 quarters
|
|
1340
CALL
XP
XP
$7.8B
| $4M | ﹤0.01% |
190,700
+13,700
| +8% | +$243K |
2021 Q1
22 quarters
|
|
1341
PUT
eBay
EBAY
$53.9B
| $4M | ﹤0.01% |
37,700
-6,000
| -14% | -$653K |
2021 Q1
22 quarters
|
|
1342
PUT
Maplebear
CART
$13.9B
| $3.98M | ﹤0.01% |
92,400
+45,800
| +98% | +$2.16M |
2023 Q3
12 quarters
|
|
1343
CALL
Dynatrace
DT
$12.7B
| $3.98M | ﹤0.01% |
69,000
-28,500
| -29% | -$1.41M |
2019 Q4
27 quarters
|
|
1344
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$96.5M
| $3.98M | ﹤0.01% |
126,100
+22,000
| +21% | +$2.04M |
2020 Q4
23 quarters
|
|
1345
CALL
Global Payments
GPN
$26.5B
| $3.98M | ﹤0.01% |
48,700
+5,200
| +12% | +$446K |
2018 Q2
33 quarters
|
|
1346
PUT
Las Vegas Sands
LVS
$26.1B
| $3.97M | ﹤0.01% |
105,000
-200
| -0.2% | -$8.92K |
2021 Q2
21 quarters
|
|
1347
Eos Energy Enterprises
EOSE
$729M
| $3.96M | ﹤0.01% |
1,293,587
+52,923
| +4% | +$206K |
2024 Q2
9 quarters
|
|
1348
CALL
S&P Global
SPGI
$138B
| $3.96M | ﹤0.01% |
23,400
-28,300
| -55% | -$12M |
2021 Q1
22 quarters
|
|
1349
PUT
ZIM Integrated Shipping Services
ZIM
$3.5B
| $3.93M | ﹤0.01% |
134,000
+7,300
| +6% | +$197K |
2026 Q1
2 quarters
|
|
1350
PUT
uniQure
QURE
$1.72B
| $3.93M | ﹤0.01% |
162,600
+123,200
| +313% | +$5.34M |
2018 Q2
33 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.