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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 | |
|---|---|---|---|---|---|---|---|
701
PUT
Rio Tinto
RIO
$138B
| $11.4M | 0.01% |
121,400
-31,400
| -21% | -$3.05M |
2014 Q4
47 quarters
|
|
702
KraneShares CSI China Internet ETF
KWEB
$4.42B
| $11.4M | 0.01% |
+466,385
| New | +$12.3M |
2026 Q3
0 quarters
|
|
703
PUT
AstraZeneca
AZN
$288B
| $11.4M | 0.01% |
70,500
+33,100
| +89% | +$5.52M |
2021 Q2
21 quarters
|
|
704
CALL
Archer Daniels Midland
ADM
$33.8B
| $11.3M | 0.01% |
142,900
-45,900
| -24% | -$3.76M |
2021 Q2
21 quarters
|
|
705
PUT
Amkor Technology
AMKR
$9.44B
| $11.3M | 0.01% |
216,100
+99,600
| +85% | +$5.54M |
2019 Q3
28 quarters
|
|
706
CALL
Southern Company
SO
$109B
| $11.3M | 0.01% |
136,200
+55,800
| +69% | +$5.08M |
2014 Q4
47 quarters
|
|
707
CALL
The Gap Inc
GAP
$7.56B
| $11.3M | 0.01% |
493,100
+381,000
| +340% | +$7.86M |
2015 Q3
44 quarters
|
|
708
CALL
Invesco DB Base Metals Fund
DBB
$356M
| $11.2M | 0.01% |
402,300
+91,800
| +30% | +$2.31M |
2026 Q1
2 quarters
|
|
|
709
CALL
AstraZeneca
AZN
$288B
| $11.2M | 0.01% |
69,500
+6,000
| +9% | +$1000K |
2021 Q2
21 quarters
|
|
710
CALL
Quanta Services
PWR
$91.6B
| $11.2M | 0.01% |
17,400
+3,400
| +24% | +$2.19M |
2021 Q2
21 quarters
|
|
711
CALL
Expand Energy Corp
EXE
$20.5B
| $11.2M | 0.01% |
132,800
+37,000
| +39% | +$3.41M |
2021 Q1
22 quarters
|
|
712
CALL
Hecla Mining
HL
$9.49B
| $11.1M | 0.01% |
654,700
-161,500
| -20% | -$2.84M |
2016 Q1
42 quarters
|
|
713
Robinhood
HOOD
$76.2B
| $11.1M | 0.01% |
99,101
+34,650
| +54% | +$3.68M |
2026 Q2
1 quarter
|
|
714
CALL
BlackBerry
BB
$5.52B
| $11.1M | 0.01% |
1,232,400
-444,800
| -27% | -$3.92M |
2021 Q2
21 quarters
|
|
715
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$5.11B
| $11.1M | 0.01% |
155,328
+145,948
| +1,556% | +$9.9M |
2026 Q2
1 quarter
|
|
716
CALL
Estee Lauder
EL
$40.7B
| $11.1M | 0.01% |
119,600
-37,500
| -24% | -$3.41M |
2014 Q4
47 quarters
|
|
717
PUT
Autodesk
ADSK
$54.3B
| $11M | 0.01% |
52,700
+30,600
| +138% | +$6.98M |
2021 Q2
21 quarters
|
|
718
CALL
Transocean
RIG
$5.93B
| $11M | 0.01% |
2,097,700
-444,400
| -17% | -$2.43M |
2021 Q2
21 quarters
|
|
719
PUT
Tradr 2X Long ACHR Daily ETF
ARCX
$4.97M
| $11M | 0.01% |
727,100
+301,200
| +71% | +$3.85M |
2026 Q1
2 quarters
|
|
720
PUT
APA Corp
APA
$15.7B
| $10.9M | 0.01% |
263,600
+22,700
| +9% | +$901K |
2021 Q2
21 quarters
|
|
721
PUT
Lennar Class A
LEN
$20.5B
| $10.9M | 0.01% |
133,900
+58,700
| +78% | +$4.93M |
2021 Q3
20 quarters
|
|
722
PUT
Venture Global Inc
VG
$31.7B
| $10.9M | 0.01% |
862,100
+272,300
| +46% | +$3.71M |
2025 Q1
6 quarters
|
|
723
CALL
Celsius Holdings
CELH
$8.28B
| $10.9M | 0.01% |
398,100
+37,000
| +10% | +$1.1M |
2020 Q3
24 quarters
|
|
724
PUT
Northrop Grumman
NOC
$78.3B
| $10.9M | 0.01% |
22,500
+13,500
| +150% | +$7.27M |
2014 Q4
47 quarters
|
|
725
PUT
Axon Enterprise
AXON
$25.7B
| $10.9M | 0.01% |
25,700
+5,100
| +25% | +$2.75M |
2014 Q4
47 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.