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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 | |
|---|---|---|---|---|---|---|---|
551
Invesco QQQ Trust
QQQ
$468B
| $15.9M | 0.01% |
21,532
+8,932
| +71% | +$6.38M |
2026 Q1
2 quarters
|
|
552
CALL
Comfort Systems
FIX
$40.9B
| $15.9M | 0.01% |
9,600
+3,500
| +57% | +$5.88M |
2022 Q3
16 quarters
|
|
553
CALL
QXO Inc
QXO
$14.3B
| $15.9M | 0.01% |
1,358,000
+139,700
| +11% | +$1.92M |
2024 Q3
8 quarters
|
|
554
Charter Communications
CHTR
$15.6B
| $15.8M | 0.01% |
142,877
+38,150
| +36% | +$5.31M |
2026 Q1
2 quarters
|
|
555
PUT
DocuSign
DOCU
$15B
| $15.8M | 0.01% |
235,600
-77,700
| -25% | -$4.62M |
2021 Q1
22 quarters
|
|
556
PUT
Blackrock
BLK
$189B
| $15.8M | 0.01% |
14,900
-100
| -0.7% | -$109K |
2014 Q4
47 quarters
|
|
557
PUT
KKR & Co
KKR
$89.7B
| $15.7M | 0.01% |
171,700
-48,000
| -22% | -$4.9M |
2014 Q4
47 quarters
|
|
558
CALL
Williams Companies
WMB
$86.2B
| $15.7M | 0.01% |
230,600
+29,800
| +15% | +$2.17M |
2019 Q1
30 quarters
|
|
559
PUT
Phillips 66
PSX
$101B
| $15.6M | 0.01% |
61,200
+11,600
| +23% | +$2.65M |
2014 Q4
47 quarters
|
|
560
PUT
GitLab
GTLB
$7.88B
| $15.5M | 0.01% |
327,300
+148,900
| +83% | +$6.03M |
2021 Q4
19 quarters
|
|
561
PUT
Agnico Eagle Mines
AEM
$94B
| $15.4M | 0.01% |
84,100
+39,200
| +87% | +$6.95M |
2021 Q2
21 quarters
|
|
562
CALL
Royal Bank of Canada
RY
$282B
| $15.4M | 0.01% |
78,200
+25,100
| +47% | +$5.22M |
2014 Q4
47 quarters
|
|
563
Fidelity Wise Origin Bitcoin Fund
FBTC
$13.8B
| $15.4M | 0.01% |
211,625
+88,187
| +71% | +$5.46M |
2026 Q1
2 quarters
|
|
564
CALL
UiPath
PATH
$6.85B
| $15.3M | 0.01% |
1,193,800
+118,000
| +11% | +$1.64M |
2021 Q2
21 quarters
|
|
565
PUT
Bank of New York Mellon
BNY
$103B
| $15.3M | 0.01% |
105,700
-60,500
| -36% | -$9.5M |
2021 Q2
21 quarters
|
|
566
PUT
AutoZone
AZO
$52.1B
| $15.3M | 0.01% |
5,400
+3,700
| +218% | +$11.1M |
2015 Q1
46 quarters
|
|
567
PUT
AXT Inc
AXTI
$3.08B
| $15.3M | 0.01% |
197,300
-62,800
| -24% | -$4.05M |
2025 Q4
3 quarters
|
|
|
568
CALL
Blackrock
BLK
$189B
| $15.2M | 0.01% |
14,400
+4,000
| +38% | +$4.37M |
2014 Q4
47 quarters
|
|
569
PUT
PG&E
PCG
$28.9B
| $15.2M | 0.01% |
1,241,500
+638,300
| +106% | +$10.2M |
2017 Q4
35 quarters
|
|
570
PUT
Atlassian
TEAM
$38.6B
| $15.2M | 0.01% |
84,800
-14,900
| -15% | -$2.15M |
2021 Q2
21 quarters
|
|
571
PUT
Tower Semiconductor
TSEM
$18B
| $15.1M | 0.01% |
66,600
+9,400
| +16% | +$2.13M |
2016 Q1
42 quarters
|
|
572
CALL
The GEO Group
GEO
$4.31B
| $15.1M | 0.01% |
496,100
+204,500
| +70% | +$6.33M |
2016 Q2
41 quarters
|
|
573
CALL
Marathon Petroleum
MPC
$110B
| $15.1M | 0.01% |
38,200
-16,900
| -31% | -$5.84M |
2014 Q4
47 quarters
|
|
574
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$148B
| $15.1M | 0.01% |
147,900
-98,700
| -40% | -$7.94M |
2020 Q1
26 quarters
|
|
575
CALL
Albemarle
ALB
$11.3B
| $15.1M | 0.01% |
142,300
-8,000
| -5% | -$993K |
2015 Q4
43 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.