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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 | |
|---|---|---|---|---|---|---|---|
1626
PUT
Guidewire Software
GWRE
$13.1B
| $2.94M | ﹤0.01% |
20,600
+15,200
| +281% | +$2.41M |
2016 Q1
42 quarters
|
|
1627
PUT
Klarna Group
KLAR
$5.11B
| $2.93M | ﹤0.01% |
236,800
+133,200
| +129% | +$2.22M |
2025 Q3
4 quarters
|
|
1628
CALL
Roivant Sciences
ROIV
$30.3B
| $2.93M | ﹤0.01% |
80,200
+53,500
| +200% | +$1.94M |
2022 Q4
15 quarters
|
|
1629
PUT
Baker Hughes
BKR
$49.1B
| $2.93M | ﹤0.01% |
53,400
-37,500
| -41% | -$2.24M |
2017 Q3
36 quarters
|
|
1630
SentinelOne
S
$8.28B
| $2.93M | ﹤0.01% |
123,364
-13,407
| -10% | -$277K |
2025 Q2
5 quarters
|
|
1631
CALL
Gildan
GIL
$6.63B
| $2.92M | ﹤0.01% |
68,600
+4,200
| +7% | +$217K |
2019 Q2
29 quarters
|
|
1632
CALL
AES
AES
$10.6B
| $2.92M | ﹤0.01% |
195,800
+24,200
| +14% | +$357K |
2017 Q4
35 quarters
|
|
1633
CALL
Galicia Financial Group
GGAL
$4.8B
| $2.91M | ﹤0.01% |
78,200
+2,400
| +3% | +$110K |
2026 Q1
2 quarters
|
|
1634
PUT
Dynatrace
DT
$12.7B
| $2.91M | ﹤0.01% |
50,400
-12,900
| -20% | -$638K |
2019 Q4
27 quarters
|
|
1635
PUT
Clorox
CLX
$12.9B
| $2.91M | ﹤0.01% |
35,900
-30,600
| -46% | -$2.94M |
2018 Q1
34 quarters
|
|
1636
PUT
Fastenal
FAST
$63.7B
| $2.91M | ﹤0.01% |
58,700
+41,800
| +247% | +$2.05M |
2014 Q4
47 quarters
|
|
1637
Knight Transportation
KNX
$10.2B
| $2.91M | ﹤0.01% |
45,714
+44,373
| +3,309% | +$3.13M |
2026 Q1
2 quarters
|
|
1638
PUT
AbCellera Biologics
ABCL
$3.87B
| $2.91M | ﹤0.01% |
199,200
+23,700
| +14% | +$225K |
2021 Q1
22 quarters
|
|
1639
CALL
Enviri
NVRI
$706M
| $2.91M | ﹤0.01% |
148,800
-131,100
| -47% | -$2.85M |
2025 Q1
6 quarters
|
|
1640
CALL
Conagra Brands
CAG
$7.08B
| $2.91M | ﹤0.01% |
216,200
-2,100
| -1% | -$31.5K |
2021 Q1
22 quarters
|
|
1641
United Parcel Service
UPS
$95.7B
| $2.9M | ﹤0.01% |
+31,046
| New | +$3.26M |
2026 Q3
0 quarters
|
|
1642
PUT
Vail Resorts
MTN
$5.52B
| $2.89M | ﹤0.01% |
21,100
-3,300
| -14% | -$476K |
2018 Q2
33 quarters
|
|
1643
CALL
Baxter International
BAX
$13.6B
| $2.89M | ﹤0.01% |
120,500
-29,000
| -19% | -$713K |
2021 Q2
21 quarters
|
|
1644
PUT
Xylem
XYL
$21.8B
| $2.89M | ﹤0.01% |
28,500
-600
| -2% | -$68.7K |
2018 Q2
33 quarters
|
|
1645
PUT
Bank of Montreal
BMO
$121B
| $2.88M | ﹤0.01% |
17,200
-30,900
| -64% | -$5.46M |
2017 Q2
37 quarters
|
|
1646
Elastic
ESTC
$9.17B
| $2.88M | ﹤0.01% |
31,370
+15,254
| +95% | +$1.17M |
2025 Q3
4 quarters
|
|
1647
CALL
Leverage Shares 2X Long CRCL Daily ETF
CRCG
$75.4M
| $2.87M | ﹤0.01% |
196,100
+69,300
| +55% | +$822K |
2025 Q3
4 quarters
|
|
1648
PUT
Diamondback Energy
FANG
$50.5B
| $2.87M | ﹤0.01% |
15,600
+1,800
| +13% | +$352K |
2014 Q4
47 quarters
|
|
1649
Vertiv
VRT
$79.5B
| $2.86M | ﹤0.01% |
11,853
+6,388
| +117% | +$1.74M |
2026 Q2
1 quarter
|
|
1650
PUT
Corcept Therapeutics
CORT
$8.06B
| $2.86M | ﹤0.01% |
24,800
+700
| +3% | +$75.3K |
2017 Q4
35 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.