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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 | |
|---|---|---|---|---|---|---|---|
1576
CALL
Maplebear
CART
$13.9B
| $3.08M | ﹤0.01% |
71,400
-52,000
| -42% | -$2.46M |
2023 Q3
12 quarters
|
|
1577
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$8.79B
| $3.08M | ﹤0.01% |
14,700
+9,900
| +206% | +$427K |
2023 Q4
11 quarters
|
|
1578
CALL
Herbalife
HLF
$1.63B
| $3.07M | ﹤0.01% |
253,500
+98,600
| +64% | +$1.21M |
2014 Q4
47 quarters
|
|
1579
CALL
C3.ai
AI
$1.96B
| $3.07M | ﹤0.01% |
279,700
-21,000
| -7% | -$207K |
2020 Q4
23 quarters
|
|
1580
PUT
McKesson
MCK
$125B
| $3.07M | ﹤0.01% |
3,600
-4,400
| -55% | -$3.79M |
2021 Q2
21 quarters
|
|
1581
CALL
Avantor
AVTR
$10.7B
| $3.07M | ﹤0.01% |
204,200
-74,600
| -27% | -$1M |
2019 Q2
29 quarters
|
|
1582
ZIM Integrated Shipping Services
ZIM
$3.5B
| $3.07M | ﹤0.01% |
104,783
+4,589
| +5% | +$124K |
2026 Q1
2 quarters
|
|
1583
CALL
Teladoc Health
TDOC
$1.63B
| $3.07M | ﹤0.01% |
529,000
+194,800
| +58% | +$1.43M |
2016 Q3
40 quarters
|
|
1584
PUT
Chewy
CHWY
$9.3B
| $3.06M | ﹤0.01% |
168,300
+7,000
| +4% | +$153K |
2019 Q2
29 quarters
|
|
1585
CALL
QuantumScape Corp
QS
$2.61B
| $3.06M | ﹤0.01% |
659,100
-284,700
| -30% | -$1.62M |
2020 Q3
24 quarters
|
|
1586
CALL
W.P. Carey
WPC
$14.9B
| $3.04M | ﹤0.01% |
47,100
+43,200
| +1,108% | +$3.06M |
2017 Q4
35 quarters
|
|
1587
Twilio
TWLO
$34B
| $3.04M | ﹤0.01% |
10,398
-13,422
| -56% | -$3.06M |
2026 Q2
1 quarter
|
|
1588
ACM Research
ACMR
$3.67B
| $3.04M | ﹤0.01% |
37,535
-6,781
| -15% | -$549K |
2024 Q2
9 quarters
|
|
1589
CALL
Navan Inc
NAVN
$6.87B
| $3.04M | ﹤0.01% |
144,700
+51,800
| +56% | +$1.33M |
2025 Q4
3 quarters
|
|
1590
Equinor
EQNR
$97.8B
| $3.04M | ﹤0.01% |
72,995
+12,656
| +21% | +$511K |
2025 Q3
4 quarters
|
|
1591
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.44B
| $3.03M | ﹤0.01% |
41,100
+27,200
| +196% | +$1.36M |
2018 Q3
32 quarters
|
|
1592
PUT
Modine Manufacturing
MOD
$5.67B
| $3.03M | ﹤0.01% |
16,200
+6,500
| +67% | +$1.33M |
2022 Q2
17 quarters
|
|
1593
CALL
WisdomTree
WT
$3.23B
| $3.03M | ﹤0.01% |
124,800
+62,900
| +102% | +$1.38M |
2024 Q1
10 quarters
|
|
1594
CALL
BioMarin Pharmaceuticals
BMRN
$11.3B
| $3.03M | ﹤0.01% |
50,500
-33,800
| -40% | -$2.13M |
2014 Q4
47 quarters
|
|
1595
CALL
Annaly Capital Management
NLY
$14.4B
| $3.03M | ﹤0.01% |
160,400
+59,600
| +59% | +$1.34M |
2026 Q1
2 quarters
|
|
1596
Roblox
RBLX
$37.7B
| $3.03M | ﹤0.01% |
+71,498
| New | +$3.24M |
2026 Q3
0 quarters
|
|
1597
PUT
AES
AES
$10.6B
| $3.03M | ﹤0.01% |
203,300
-100
| -0% | -$1.48K |
2018 Q2
33 quarters
|
|
1598
BlackBerry
BB
$5.52B
| $3.03M | ﹤0.01% |
334,960
+42,083
| +14% | +$371K |
2024 Q1
10 quarters
|
|
1599
PUT
Bilibili
BILI
$5.58B
| $3.02M | ﹤0.01% |
200,900
-63,300
| -24% | -$1.07M |
2018 Q2
33 quarters
|
|
1600
CALL
ProShares Ether Strategy ETF
EETH
$53.4M
| $3.02M | ﹤0.01% |
111,400
-79,300
| -42% | -$2.09M |
2024 Q1
10 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.